http-push.con commit Add shortcut in refresh_cache_ent() for marked entries. (aa9349d)
   1#include "cache.h"
   2#include "commit.h"
   3#include "pack.h"
   4#include "tag.h"
   5#include "blob.h"
   6#include "http.h"
   7#include "refs.h"
   8#include "diff.h"
   9#include "revision.h"
  10#include "exec_cmd.h"
  11#include "remote.h"
  12
  13#include <expat.h>
  14
  15static const char http_push_usage[] =
  16"git-http-push [--all] [--dry-run] [--force] [--verbose] <remote> [<head>...]\n";
  17
  18#ifndef XML_STATUS_OK
  19enum XML_Status {
  20  XML_STATUS_OK = 1,
  21  XML_STATUS_ERROR = 0
  22};
  23#define XML_STATUS_OK    1
  24#define XML_STATUS_ERROR 0
  25#endif
  26
  27#define PREV_BUF_SIZE 4096
  28#define RANGE_HEADER_SIZE 30
  29
  30/* DAV methods */
  31#define DAV_LOCK "LOCK"
  32#define DAV_MKCOL "MKCOL"
  33#define DAV_MOVE "MOVE"
  34#define DAV_PROPFIND "PROPFIND"
  35#define DAV_PUT "PUT"
  36#define DAV_UNLOCK "UNLOCK"
  37#define DAV_DELETE "DELETE"
  38
  39/* DAV lock flags */
  40#define DAV_PROP_LOCKWR (1u << 0)
  41#define DAV_PROP_LOCKEX (1u << 1)
  42#define DAV_LOCK_OK (1u << 2)
  43
  44/* DAV XML properties */
  45#define DAV_CTX_LOCKENTRY ".multistatus.response.propstat.prop.supportedlock.lockentry"
  46#define DAV_CTX_LOCKTYPE_WRITE ".multistatus.response.propstat.prop.supportedlock.lockentry.locktype.write"
  47#define DAV_CTX_LOCKTYPE_EXCLUSIVE ".multistatus.response.propstat.prop.supportedlock.lockentry.lockscope.exclusive"
  48#define DAV_ACTIVELOCK_OWNER ".prop.lockdiscovery.activelock.owner.href"
  49#define DAV_ACTIVELOCK_TIMEOUT ".prop.lockdiscovery.activelock.timeout"
  50#define DAV_ACTIVELOCK_TOKEN ".prop.lockdiscovery.activelock.locktoken.href"
  51#define DAV_PROPFIND_RESP ".multistatus.response"
  52#define DAV_PROPFIND_NAME ".multistatus.response.href"
  53#define DAV_PROPFIND_COLLECTION ".multistatus.response.propstat.prop.resourcetype.collection"
  54
  55/* DAV request body templates */
  56#define PROPFIND_SUPPORTEDLOCK_REQUEST "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:propfind xmlns:D=\"DAV:\">\n<D:prop xmlns:R=\"%s\">\n<D:supportedlock/>\n</D:prop>\n</D:propfind>"
  57#define PROPFIND_ALL_REQUEST "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:propfind xmlns:D=\"DAV:\">\n<D:allprop/>\n</D:propfind>"
  58#define LOCK_REQUEST "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:lockinfo xmlns:D=\"DAV:\">\n<D:lockscope><D:exclusive/></D:lockscope>\n<D:locktype><D:write/></D:locktype>\n<D:owner>\n<D:href>mailto:%s</D:href>\n</D:owner>\n</D:lockinfo>"
  59
  60#define LOCK_TIME 600
  61#define LOCK_REFRESH 30
  62
  63/* bits #0-15 in revision.h */
  64
  65#define LOCAL    (1u<<16)
  66#define REMOTE   (1u<<17)
  67#define FETCHING (1u<<18)
  68#define PUSHING  (1u<<19)
  69
  70/* We allow "recursive" symbolic refs. Only within reason, though */
  71#define MAXDEPTH 5
  72
  73static int pushing;
  74static int aborted;
  75static signed char remote_dir_exists[256];
  76
  77static struct curl_slist *no_pragma_header;
  78
  79static int push_verbosely;
  80static int push_all = MATCH_REFS_NONE;
  81static int force_all;
  82static int dry_run;
  83
  84static struct object_list *objects;
  85
  86struct repo
  87{
  88        char *url;
  89        int path_len;
  90        int has_info_refs;
  91        int can_update_info_refs;
  92        int has_info_packs;
  93        struct packed_git *packs;
  94        struct remote_lock *locks;
  95};
  96
  97static struct repo *remote;
  98
  99enum transfer_state {
 100        NEED_FETCH,
 101        RUN_FETCH_LOOSE,
 102        RUN_FETCH_PACKED,
 103        NEED_PUSH,
 104        RUN_MKCOL,
 105        RUN_PUT,
 106        RUN_MOVE,
 107        ABORTED,
 108        COMPLETE,
 109};
 110
 111struct transfer_request
 112{
 113        struct object *obj;
 114        char *url;
 115        char *dest;
 116        struct remote_lock *lock;
 117        struct curl_slist *headers;
 118        struct buffer buffer;
 119        char filename[PATH_MAX];
 120        char tmpfile[PATH_MAX];
 121        int local_fileno;
 122        FILE *local_stream;
 123        enum transfer_state state;
 124        CURLcode curl_result;
 125        char errorstr[CURL_ERROR_SIZE];
 126        long http_code;
 127        unsigned char real_sha1[20];
 128        SHA_CTX c;
 129        z_stream stream;
 130        int zret;
 131        int rename;
 132        void *userData;
 133        struct active_request_slot *slot;
 134        struct transfer_request *next;
 135};
 136
 137static struct transfer_request *request_queue_head;
 138
 139struct xml_ctx
 140{
 141        char *name;
 142        int len;
 143        char *cdata;
 144        void (*userFunc)(struct xml_ctx *ctx, int tag_closed);
 145        void *userData;
 146};
 147
 148struct remote_lock
 149{
 150        char *url;
 151        char *owner;
 152        char *token;
 153        time_t start_time;
 154        long timeout;
 155        int refreshing;
 156        struct remote_lock *next;
 157};
 158
 159/* Flags that control remote_ls processing */
 160#define PROCESS_FILES (1u << 0)
 161#define PROCESS_DIRS  (1u << 1)
 162#define RECURSIVE     (1u << 2)
 163
 164/* Flags that remote_ls passes to callback functions */
 165#define IS_DIR (1u << 0)
 166
 167struct remote_ls_ctx
 168{
 169        char *path;
 170        void (*userFunc)(struct remote_ls_ctx *ls);
 171        void *userData;
 172        int flags;
 173        char *dentry_name;
 174        int dentry_flags;
 175        struct remote_ls_ctx *parent;
 176};
 177
 178static void finish_request(struct transfer_request *request);
 179static void release_request(struct transfer_request *request);
 180
 181static void process_response(void *callback_data)
 182{
 183        struct transfer_request *request =
 184                (struct transfer_request *)callback_data;
 185
 186        finish_request(request);
 187}
 188
 189#ifdef USE_CURL_MULTI
 190static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
 191                               void *data)
 192{
 193        unsigned char expn[4096];
 194        size_t size = eltsize * nmemb;
 195        int posn = 0;
 196        struct transfer_request *request = (struct transfer_request *)data;
 197        do {
 198                ssize_t retval = xwrite(request->local_fileno,
 199                                       (char *) ptr + posn, size - posn);
 200                if (retval < 0)
 201                        return posn;
 202                posn += retval;
 203        } while (posn < size);
 204
 205        request->stream.avail_in = size;
 206        request->stream.next_in = ptr;
 207        do {
 208                request->stream.next_out = expn;
 209                request->stream.avail_out = sizeof(expn);
 210                request->zret = inflate(&request->stream, Z_SYNC_FLUSH);
 211                SHA1_Update(&request->c, expn,
 212                            sizeof(expn) - request->stream.avail_out);
 213        } while (request->stream.avail_in && request->zret == Z_OK);
 214        data_received++;
 215        return size;
 216}
 217
 218static void start_fetch_loose(struct transfer_request *request)
 219{
 220        char *hex = sha1_to_hex(request->obj->sha1);
 221        char *filename;
 222        char prevfile[PATH_MAX];
 223        char *url;
 224        char *posn;
 225        int prevlocal;
 226        unsigned char prev_buf[PREV_BUF_SIZE];
 227        ssize_t prev_read = 0;
 228        long prev_posn = 0;
 229        char range[RANGE_HEADER_SIZE];
 230        struct curl_slist *range_header = NULL;
 231        struct active_request_slot *slot;
 232
 233        filename = sha1_file_name(request->obj->sha1);
 234        snprintf(request->filename, sizeof(request->filename), "%s", filename);
 235        snprintf(request->tmpfile, sizeof(request->tmpfile),
 236                 "%s.temp", filename);
 237
 238        snprintf(prevfile, sizeof(prevfile), "%s.prev", request->filename);
 239        unlink(prevfile);
 240        rename(request->tmpfile, prevfile);
 241        unlink(request->tmpfile);
 242
 243        if (request->local_fileno != -1)
 244                error("fd leakage in start: %d", request->local_fileno);
 245        request->local_fileno = open(request->tmpfile,
 246                                     O_WRONLY | O_CREAT | O_EXCL, 0666);
 247        /* This could have failed due to the "lazy directory creation";
 248         * try to mkdir the last path component.
 249         */
 250        if (request->local_fileno < 0 && errno == ENOENT) {
 251                char *dir = strrchr(request->tmpfile, '/');
 252                if (dir) {
 253                        *dir = 0;
 254                        mkdir(request->tmpfile, 0777);
 255                        *dir = '/';
 256                }
 257                request->local_fileno = open(request->tmpfile,
 258                                             O_WRONLY | O_CREAT | O_EXCL, 0666);
 259        }
 260
 261        if (request->local_fileno < 0) {
 262                request->state = ABORTED;
 263                error("Couldn't create temporary file %s for %s: %s",
 264                      request->tmpfile, request->filename, strerror(errno));
 265                return;
 266        }
 267
 268        memset(&request->stream, 0, sizeof(request->stream));
 269
 270        inflateInit(&request->stream);
 271
 272        SHA1_Init(&request->c);
 273
 274        url = xmalloc(strlen(remote->url) + 50);
 275        request->url = xmalloc(strlen(remote->url) + 50);
 276        strcpy(url, remote->url);
 277        posn = url + strlen(remote->url);
 278        strcpy(posn, "objects/");
 279        posn += 8;
 280        memcpy(posn, hex, 2);
 281        posn += 2;
 282        *(posn++) = '/';
 283        strcpy(posn, hex + 2);
 284        strcpy(request->url, url);
 285
 286        /* If a previous temp file is present, process what was already
 287           fetched. */
 288        prevlocal = open(prevfile, O_RDONLY);
 289        if (prevlocal != -1) {
 290                do {
 291                        prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
 292                        if (prev_read>0) {
 293                                if (fwrite_sha1_file(prev_buf,
 294                                                     1,
 295                                                     prev_read,
 296                                                     request) == prev_read) {
 297                                        prev_posn += prev_read;
 298                                } else {
 299                                        prev_read = -1;
 300                                }
 301                        }
 302                } while (prev_read > 0);
 303                close(prevlocal);
 304        }
 305        unlink(prevfile);
 306
 307        /* Reset inflate/SHA1 if there was an error reading the previous temp
 308           file; also rewind to the beginning of the local file. */
 309        if (prev_read == -1) {
 310                memset(&request->stream, 0, sizeof(request->stream));
 311                inflateInit(&request->stream);
 312                SHA1_Init(&request->c);
 313                if (prev_posn>0) {
 314                        prev_posn = 0;
 315                        lseek(request->local_fileno, 0, SEEK_SET);
 316                        ftruncate(request->local_fileno, 0);
 317                }
 318        }
 319
 320        slot = get_active_slot();
 321        slot->callback_func = process_response;
 322        slot->callback_data = request;
 323        request->slot = slot;
 324
 325        curl_easy_setopt(slot->curl, CURLOPT_FILE, request);
 326        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
 327        curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
 328        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 329        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
 330
 331        /* If we have successfully processed data from a previous fetch
 332           attempt, only fetch the data we don't already have. */
 333        if (prev_posn>0) {
 334                if (push_verbosely)
 335                        fprintf(stderr,
 336                                "Resuming fetch of object %s at byte %ld\n",
 337                                hex, prev_posn);
 338                sprintf(range, "Range: bytes=%ld-", prev_posn);
 339                range_header = curl_slist_append(range_header, range);
 340                curl_easy_setopt(slot->curl,
 341                                 CURLOPT_HTTPHEADER, range_header);
 342        }
 343
 344        /* Try to get the request started, abort the request on error */
 345        request->state = RUN_FETCH_LOOSE;
 346        if (!start_active_slot(slot)) {
 347                fprintf(stderr, "Unable to start GET request\n");
 348                remote->can_update_info_refs = 0;
 349                release_request(request);
 350        }
 351}
 352
 353static void start_mkcol(struct transfer_request *request)
 354{
 355        char *hex = sha1_to_hex(request->obj->sha1);
 356        struct active_request_slot *slot;
 357        char *posn;
 358
 359        request->url = xmalloc(strlen(remote->url) + 13);
 360        strcpy(request->url, remote->url);
 361        posn = request->url + strlen(remote->url);
 362        strcpy(posn, "objects/");
 363        posn += 8;
 364        memcpy(posn, hex, 2);
 365        posn += 2;
 366        strcpy(posn, "/");
 367
 368        slot = get_active_slot();
 369        slot->callback_func = process_response;
 370        slot->callback_data = request;
 371        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); /* undo PUT setup */
 372        curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 373        curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
 374        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
 375        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 376
 377        if (start_active_slot(slot)) {
 378                request->slot = slot;
 379                request->state = RUN_MKCOL;
 380        } else {
 381                request->state = ABORTED;
 382                free(request->url);
 383                request->url = NULL;
 384        }
 385}
 386#endif
 387
 388static void start_fetch_packed(struct transfer_request *request)
 389{
 390        char *url;
 391        struct packed_git *target;
 392        FILE *packfile;
 393        char *filename;
 394        long prev_posn = 0;
 395        char range[RANGE_HEADER_SIZE];
 396        struct curl_slist *range_header = NULL;
 397
 398        struct transfer_request *check_request = request_queue_head;
 399        struct active_request_slot *slot;
 400
 401        target = find_sha1_pack(request->obj->sha1, remote->packs);
 402        if (!target) {
 403                fprintf(stderr, "Unable to fetch %s, will not be able to update server info refs\n", sha1_to_hex(request->obj->sha1));
 404                remote->can_update_info_refs = 0;
 405                release_request(request);
 406                return;
 407        }
 408
 409        fprintf(stderr, "Fetching pack %s\n", sha1_to_hex(target->sha1));
 410        fprintf(stderr, " which contains %s\n", sha1_to_hex(request->obj->sha1));
 411
 412        filename = sha1_pack_name(target->sha1);
 413        snprintf(request->filename, sizeof(request->filename), "%s", filename);
 414        snprintf(request->tmpfile, sizeof(request->tmpfile),
 415                 "%s.temp", filename);
 416
 417        url = xmalloc(strlen(remote->url) + 64);
 418        sprintf(url, "%sobjects/pack/pack-%s.pack",
 419                remote->url, sha1_to_hex(target->sha1));
 420
 421        /* Make sure there isn't another open request for this pack */
 422        while (check_request) {
 423                if (check_request->state == RUN_FETCH_PACKED &&
 424                    !strcmp(check_request->url, url)) {
 425                        free(url);
 426                        release_request(request);
 427                        return;
 428                }
 429                check_request = check_request->next;
 430        }
 431
 432        packfile = fopen(request->tmpfile, "a");
 433        if (!packfile) {
 434                fprintf(stderr, "Unable to open local file %s for pack",
 435                        request->tmpfile);
 436                remote->can_update_info_refs = 0;
 437                free(url);
 438                return;
 439        }
 440
 441        slot = get_active_slot();
 442        slot->callback_func = process_response;
 443        slot->callback_data = request;
 444        request->slot = slot;
 445        request->local_stream = packfile;
 446        request->userData = target;
 447
 448        request->url = url;
 449        curl_easy_setopt(slot->curl, CURLOPT_FILE, packfile);
 450        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
 451        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 452        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
 453        slot->local = packfile;
 454
 455        /* If there is data present from a previous transfer attempt,
 456           resume where it left off */
 457        prev_posn = ftell(packfile);
 458        if (prev_posn>0) {
 459                if (push_verbosely)
 460                        fprintf(stderr,
 461                                "Resuming fetch of pack %s at byte %ld\n",
 462                                sha1_to_hex(target->sha1), prev_posn);
 463                sprintf(range, "Range: bytes=%ld-", prev_posn);
 464                range_header = curl_slist_append(range_header, range);
 465                curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
 466        }
 467
 468        /* Try to get the request started, abort the request on error */
 469        request->state = RUN_FETCH_PACKED;
 470        if (!start_active_slot(slot)) {
 471                fprintf(stderr, "Unable to start GET request\n");
 472                remote->can_update_info_refs = 0;
 473                release_request(request);
 474        }
 475}
 476
 477static void start_put(struct transfer_request *request)
 478{
 479        char *hex = sha1_to_hex(request->obj->sha1);
 480        struct active_request_slot *slot;
 481        char *posn;
 482        enum object_type type;
 483        char hdr[50];
 484        void *unpacked;
 485        unsigned long len;
 486        int hdrlen;
 487        ssize_t size;
 488        z_stream stream;
 489
 490        unpacked = read_sha1_file(request->obj->sha1, &type, &len);
 491        hdrlen = sprintf(hdr, "%s %lu", typename(type), len) + 1;
 492
 493        /* Set it up */
 494        memset(&stream, 0, sizeof(stream));
 495        deflateInit(&stream, zlib_compression_level);
 496        size = deflateBound(&stream, len + hdrlen);
 497        strbuf_init(&request->buffer.buf, size);
 498        request->buffer.posn = 0;
 499
 500        /* Compress it */
 501        stream.next_out = (unsigned char *)request->buffer.buf.buf;
 502        stream.avail_out = size;
 503
 504        /* First header.. */
 505        stream.next_in = (void *)hdr;
 506        stream.avail_in = hdrlen;
 507        while (deflate(&stream, 0) == Z_OK)
 508                /* nothing */;
 509
 510        /* Then the data itself.. */
 511        stream.next_in = unpacked;
 512        stream.avail_in = len;
 513        while (deflate(&stream, Z_FINISH) == Z_OK)
 514                /* nothing */;
 515        deflateEnd(&stream);
 516        free(unpacked);
 517
 518        request->buffer.buf.len = stream.total_out;
 519
 520        request->url = xmalloc(strlen(remote->url) +
 521                               strlen(request->lock->token) + 51);
 522        strcpy(request->url, remote->url);
 523        posn = request->url + strlen(remote->url);
 524        strcpy(posn, "objects/");
 525        posn += 8;
 526        memcpy(posn, hex, 2);
 527        posn += 2;
 528        *(posn++) = '/';
 529        strcpy(posn, hex + 2);
 530        request->dest = xmalloc(strlen(request->url) + 14);
 531        sprintf(request->dest, "Destination: %s", request->url);
 532        posn += 38;
 533        *(posn++) = '_';
 534        strcpy(posn, request->lock->token);
 535
 536        slot = get_active_slot();
 537        slot->callback_func = process_response;
 538        slot->callback_data = request;
 539        curl_easy_setopt(slot->curl, CURLOPT_INFILE, &request->buffer);
 540        curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, request->buffer.buf.len);
 541        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
 542        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 543        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
 544        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
 545        curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
 546        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 547        curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 548
 549        if (start_active_slot(slot)) {
 550                request->slot = slot;
 551                request->state = RUN_PUT;
 552        } else {
 553                request->state = ABORTED;
 554                free(request->url);
 555                request->url = NULL;
 556        }
 557}
 558
 559static void start_move(struct transfer_request *request)
 560{
 561        struct active_request_slot *slot;
 562        struct curl_slist *dav_headers = NULL;
 563
 564        slot = get_active_slot();
 565        slot->callback_func = process_response;
 566        slot->callback_data = request;
 567        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); /* undo PUT setup */
 568        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MOVE);
 569        dav_headers = curl_slist_append(dav_headers, request->dest);
 570        dav_headers = curl_slist_append(dav_headers, "Overwrite: T");
 571        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 572        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 573        curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 574
 575        if (start_active_slot(slot)) {
 576                request->slot = slot;
 577                request->state = RUN_MOVE;
 578        } else {
 579                request->state = ABORTED;
 580                free(request->url);
 581                request->url = NULL;
 582        }
 583}
 584
 585static int refresh_lock(struct remote_lock *lock)
 586{
 587        struct active_request_slot *slot;
 588        struct slot_results results;
 589        char *if_header;
 590        char timeout_header[25];
 591        struct curl_slist *dav_headers = NULL;
 592        int rc = 0;
 593
 594        lock->refreshing = 1;
 595
 596        if_header = xmalloc(strlen(lock->token) + 25);
 597        sprintf(if_header, "If: (<opaquelocktoken:%s>)", lock->token);
 598        sprintf(timeout_header, "Timeout: Second-%ld", lock->timeout);
 599        dav_headers = curl_slist_append(dav_headers, if_header);
 600        dav_headers = curl_slist_append(dav_headers, timeout_header);
 601
 602        slot = get_active_slot();
 603        slot->results = &results;
 604        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 605        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 606        curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
 607        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
 608        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 609
 610        if (start_active_slot(slot)) {
 611                run_active_slot(slot);
 612                if (results.curl_result != CURLE_OK) {
 613                        fprintf(stderr, "LOCK HTTP error %ld\n",
 614                                results.http_code);
 615                } else {
 616                        lock->start_time = time(NULL);
 617                        rc = 1;
 618                }
 619        }
 620
 621        lock->refreshing = 0;
 622        curl_slist_free_all(dav_headers);
 623        free(if_header);
 624
 625        return rc;
 626}
 627
 628static void check_locks(void)
 629{
 630        struct remote_lock *lock = remote->locks;
 631        time_t current_time = time(NULL);
 632        int time_remaining;
 633
 634        while (lock) {
 635                time_remaining = lock->start_time + lock->timeout -
 636                        current_time;
 637                if (!lock->refreshing && time_remaining < LOCK_REFRESH) {
 638                        if (!refresh_lock(lock)) {
 639                                fprintf(stderr,
 640                                        "Unable to refresh lock for %s\n",
 641                                        lock->url);
 642                                aborted = 1;
 643                                return;
 644                        }
 645                }
 646                lock = lock->next;
 647        }
 648}
 649
 650static void release_request(struct transfer_request *request)
 651{
 652        struct transfer_request *entry = request_queue_head;
 653
 654        if (request == request_queue_head) {
 655                request_queue_head = request->next;
 656        } else {
 657                while (entry->next != NULL && entry->next != request)
 658                        entry = entry->next;
 659                if (entry->next == request)
 660                        entry->next = entry->next->next;
 661        }
 662
 663        if (request->local_fileno != -1)
 664                close(request->local_fileno);
 665        if (request->local_stream)
 666                fclose(request->local_stream);
 667        free(request->url);
 668        free(request);
 669}
 670
 671static void finish_request(struct transfer_request *request)
 672{
 673        struct stat st;
 674        struct packed_git *target;
 675        struct packed_git **lst;
 676
 677        request->curl_result = request->slot->curl_result;
 678        request->http_code = request->slot->http_code;
 679        request->slot = NULL;
 680
 681        /* Keep locks active */
 682        check_locks();
 683
 684        if (request->headers != NULL)
 685                curl_slist_free_all(request->headers);
 686
 687        /* URL is reused for MOVE after PUT */
 688        if (request->state != RUN_PUT) {
 689                free(request->url);
 690                request->url = NULL;
 691        }
 692
 693        if (request->state == RUN_MKCOL) {
 694                if (request->curl_result == CURLE_OK ||
 695                    request->http_code == 405) {
 696                        remote_dir_exists[request->obj->sha1[0]] = 1;
 697                        start_put(request);
 698                } else {
 699                        fprintf(stderr, "MKCOL %s failed, aborting (%d/%ld)\n",
 700                                sha1_to_hex(request->obj->sha1),
 701                                request->curl_result, request->http_code);
 702                        request->state = ABORTED;
 703                        aborted = 1;
 704                }
 705        } else if (request->state == RUN_PUT) {
 706                if (request->curl_result == CURLE_OK) {
 707                        start_move(request);
 708                } else {
 709                        fprintf(stderr, "PUT %s failed, aborting (%d/%ld)\n",
 710                                sha1_to_hex(request->obj->sha1),
 711                                request->curl_result, request->http_code);
 712                        request->state = ABORTED;
 713                        aborted = 1;
 714                }
 715        } else if (request->state == RUN_MOVE) {
 716                if (request->curl_result == CURLE_OK) {
 717                        if (push_verbosely)
 718                                fprintf(stderr, "    sent %s\n",
 719                                        sha1_to_hex(request->obj->sha1));
 720                        request->obj->flags |= REMOTE;
 721                        release_request(request);
 722                } else {
 723                        fprintf(stderr, "MOVE %s failed, aborting (%d/%ld)\n",
 724                                sha1_to_hex(request->obj->sha1),
 725                                request->curl_result, request->http_code);
 726                        request->state = ABORTED;
 727                        aborted = 1;
 728                }
 729        } else if (request->state == RUN_FETCH_LOOSE) {
 730                fchmod(request->local_fileno, 0444);
 731                close(request->local_fileno); request->local_fileno = -1;
 732
 733                if (request->curl_result != CURLE_OK &&
 734                    request->http_code != 416) {
 735                        if (stat(request->tmpfile, &st) == 0) {
 736                                if (st.st_size == 0)
 737                                        unlink(request->tmpfile);
 738                        }
 739                } else {
 740                        if (request->http_code == 416)
 741                                fprintf(stderr, "Warning: requested range invalid; we may already have all the data.\n");
 742
 743                        inflateEnd(&request->stream);
 744                        SHA1_Final(request->real_sha1, &request->c);
 745                        if (request->zret != Z_STREAM_END) {
 746                                unlink(request->tmpfile);
 747                        } else if (hashcmp(request->obj->sha1, request->real_sha1)) {
 748                                unlink(request->tmpfile);
 749                        } else {
 750                                request->rename =
 751                                        move_temp_to_file(
 752                                                request->tmpfile,
 753                                                request->filename);
 754                                if (request->rename == 0) {
 755                                        request->obj->flags |= (LOCAL | REMOTE);
 756                                }
 757                        }
 758                }
 759
 760                /* Try fetching packed if necessary */
 761                if (request->obj->flags & LOCAL)
 762                        release_request(request);
 763                else
 764                        start_fetch_packed(request);
 765
 766        } else if (request->state == RUN_FETCH_PACKED) {
 767                if (request->curl_result != CURLE_OK) {
 768                        fprintf(stderr, "Unable to get pack file %s\n%s",
 769                                request->url, curl_errorstr);
 770                        remote->can_update_info_refs = 0;
 771                } else {
 772                        off_t pack_size = ftell(request->local_stream);
 773
 774                        fclose(request->local_stream);
 775                        request->local_stream = NULL;
 776                        if (!move_temp_to_file(request->tmpfile,
 777                                               request->filename)) {
 778                                target = (struct packed_git *)request->userData;
 779                                target->pack_size = pack_size;
 780                                lst = &remote->packs;
 781                                while (*lst != target)
 782                                        lst = &((*lst)->next);
 783                                *lst = (*lst)->next;
 784
 785                                if (!verify_pack(target, 0))
 786                                        install_packed_git(target);
 787                                else
 788                                        remote->can_update_info_refs = 0;
 789                        }
 790                }
 791                release_request(request);
 792        }
 793}
 794
 795#ifdef USE_CURL_MULTI
 796static int fill_active_slot(void *unused)
 797{
 798        struct transfer_request *request = request_queue_head;
 799
 800        if (aborted)
 801                return 0;
 802
 803        for (request = request_queue_head; request; request = request->next) {
 804                if (request->state == NEED_FETCH) {
 805                        start_fetch_loose(request);
 806                        return 1;
 807                } else if (pushing && request->state == NEED_PUSH) {
 808                        if (remote_dir_exists[request->obj->sha1[0]] == 1) {
 809                                start_put(request);
 810                        } else {
 811                                start_mkcol(request);
 812                        }
 813                        return 1;
 814                }
 815        }
 816        return 0;
 817}
 818#endif
 819
 820static void get_remote_object_list(unsigned char parent);
 821
 822static void add_fetch_request(struct object *obj)
 823{
 824        struct transfer_request *request;
 825
 826        check_locks();
 827
 828        /*
 829         * Don't fetch the object if it's known to exist locally
 830         * or is already in the request queue
 831         */
 832        if (remote_dir_exists[obj->sha1[0]] == -1)
 833                get_remote_object_list(obj->sha1[0]);
 834        if (obj->flags & (LOCAL | FETCHING))
 835                return;
 836
 837        obj->flags |= FETCHING;
 838        request = xmalloc(sizeof(*request));
 839        request->obj = obj;
 840        request->url = NULL;
 841        request->lock = NULL;
 842        request->headers = NULL;
 843        request->local_fileno = -1;
 844        request->local_stream = NULL;
 845        request->state = NEED_FETCH;
 846        request->next = request_queue_head;
 847        request_queue_head = request;
 848
 849#ifdef USE_CURL_MULTI
 850        fill_active_slots();
 851        step_active_slots();
 852#endif
 853}
 854
 855static int add_send_request(struct object *obj, struct remote_lock *lock)
 856{
 857        struct transfer_request *request = request_queue_head;
 858        struct packed_git *target;
 859
 860        /* Keep locks active */
 861        check_locks();
 862
 863        /*
 864         * Don't push the object if it's known to exist on the remote
 865         * or is already in the request queue
 866         */
 867        if (remote_dir_exists[obj->sha1[0]] == -1)
 868                get_remote_object_list(obj->sha1[0]);
 869        if (obj->flags & (REMOTE | PUSHING))
 870                return 0;
 871        target = find_sha1_pack(obj->sha1, remote->packs);
 872        if (target) {
 873                obj->flags |= REMOTE;
 874                return 0;
 875        }
 876
 877        obj->flags |= PUSHING;
 878        request = xmalloc(sizeof(*request));
 879        request->obj = obj;
 880        request->url = NULL;
 881        request->lock = lock;
 882        request->headers = NULL;
 883        request->local_fileno = -1;
 884        request->local_stream = NULL;
 885        request->state = NEED_PUSH;
 886        request->next = request_queue_head;
 887        request_queue_head = request;
 888
 889#ifdef USE_CURL_MULTI
 890        fill_active_slots();
 891        step_active_slots();
 892#endif
 893
 894        return 1;
 895}
 896
 897static int fetch_index(unsigned char *sha1)
 898{
 899        char *hex = sha1_to_hex(sha1);
 900        char *filename;
 901        char *url;
 902        char tmpfile[PATH_MAX];
 903        long prev_posn = 0;
 904        char range[RANGE_HEADER_SIZE];
 905        struct curl_slist *range_header = NULL;
 906
 907        FILE *indexfile;
 908        struct active_request_slot *slot;
 909        struct slot_results results;
 910
 911        /* Don't use the index if the pack isn't there */
 912        url = xmalloc(strlen(remote->url) + 64);
 913        sprintf(url, "%sobjects/pack/pack-%s.pack", remote->url, hex);
 914        slot = get_active_slot();
 915        slot->results = &results;
 916        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 917        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
 918        if (start_active_slot(slot)) {
 919                run_active_slot(slot);
 920                if (results.curl_result != CURLE_OK) {
 921                        free(url);
 922                        return error("Unable to verify pack %s is available",
 923                                     hex);
 924                }
 925        } else {
 926                free(url);
 927                return error("Unable to start request");
 928        }
 929
 930        if (has_pack_index(sha1)) {
 931                free(url);
 932                return 0;
 933        }
 934
 935        if (push_verbosely)
 936                fprintf(stderr, "Getting index for pack %s\n", hex);
 937
 938        sprintf(url, "%sobjects/pack/pack-%s.idx", remote->url, hex);
 939
 940        filename = sha1_pack_index_name(sha1);
 941        snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename);
 942        indexfile = fopen(tmpfile, "a");
 943        if (!indexfile) {
 944                free(url);
 945                return error("Unable to open local file %s for pack index",
 946                             tmpfile);
 947        }
 948
 949        slot = get_active_slot();
 950        slot->results = &results;
 951        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 952        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 953        curl_easy_setopt(slot->curl, CURLOPT_FILE, indexfile);
 954        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
 955        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 956        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
 957        slot->local = indexfile;
 958
 959        /* If there is data present from a previous transfer attempt,
 960           resume where it left off */
 961        prev_posn = ftell(indexfile);
 962        if (prev_posn>0) {
 963                if (push_verbosely)
 964                        fprintf(stderr,
 965                                "Resuming fetch of index for pack %s at byte %ld\n",
 966                                hex, prev_posn);
 967                sprintf(range, "Range: bytes=%ld-", prev_posn);
 968                range_header = curl_slist_append(range_header, range);
 969                curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
 970        }
 971
 972        if (start_active_slot(slot)) {
 973                run_active_slot(slot);
 974                if (results.curl_result != CURLE_OK) {
 975                        free(url);
 976                        fclose(indexfile);
 977                        return error("Unable to get pack index %s\n%s", url,
 978                                     curl_errorstr);
 979                }
 980        } else {
 981                free(url);
 982                fclose(indexfile);
 983                return error("Unable to start request");
 984        }
 985
 986        free(url);
 987        fclose(indexfile);
 988
 989        return move_temp_to_file(tmpfile, filename);
 990}
 991
 992static int setup_index(unsigned char *sha1)
 993{
 994        struct packed_git *new_pack;
 995
 996        if (fetch_index(sha1))
 997                return -1;
 998
 999        new_pack = parse_pack_index(sha1);
1000        new_pack->next = remote->packs;
1001        remote->packs = new_pack;
1002        return 0;
1003}
1004
1005static int fetch_indices(void)
1006{
1007        unsigned char sha1[20];
1008        char *url;
1009        struct strbuf buffer = STRBUF_INIT;
1010        char *data;
1011        int i = 0;
1012
1013        struct active_request_slot *slot;
1014        struct slot_results results;
1015
1016        if (push_verbosely)
1017                fprintf(stderr, "Getting pack list\n");
1018
1019        url = xmalloc(strlen(remote->url) + 20);
1020        sprintf(url, "%sobjects/info/packs", remote->url);
1021
1022        slot = get_active_slot();
1023        slot->results = &results;
1024        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
1025        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1026        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1027        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
1028        if (start_active_slot(slot)) {
1029                run_active_slot(slot);
1030                if (results.curl_result != CURLE_OK) {
1031                        strbuf_release(&buffer);
1032                        free(url);
1033                        if (results.http_code == 404)
1034                                return 0;
1035                        else
1036                                return error("%s", curl_errorstr);
1037                }
1038        } else {
1039                strbuf_release(&buffer);
1040                free(url);
1041                return error("Unable to start request");
1042        }
1043        free(url);
1044
1045        data = buffer.buf;
1046        while (i < buffer.len) {
1047                switch (data[i]) {
1048                case 'P':
1049                        i++;
1050                        if (i + 52 < buffer.len &&
1051                            !prefixcmp(data + i, " pack-") &&
1052                            !prefixcmp(data + i + 46, ".pack\n")) {
1053                                get_sha1_hex(data + i + 6, sha1);
1054                                setup_index(sha1);
1055                                i += 51;
1056                                break;
1057                        }
1058                default:
1059                        while (data[i] != '\n')
1060                                i++;
1061                }
1062                i++;
1063        }
1064
1065        strbuf_release(&buffer);
1066        return 0;
1067}
1068
1069static void one_remote_object(const char *hex)
1070{
1071        unsigned char sha1[20];
1072        struct object *obj;
1073
1074        if (get_sha1_hex(hex, sha1) != 0)
1075                return;
1076
1077        obj = lookup_object(sha1);
1078        if (!obj)
1079                obj = parse_object(sha1);
1080
1081        /* Ignore remote objects that don't exist locally */
1082        if (!obj)
1083                return;
1084
1085        obj->flags |= REMOTE;
1086        if (!object_list_contains(objects, obj))
1087                object_list_insert(obj, &objects);
1088}
1089
1090static void handle_lockprop_ctx(struct xml_ctx *ctx, int tag_closed)
1091{
1092        int *lock_flags = (int *)ctx->userData;
1093
1094        if (tag_closed) {
1095                if (!strcmp(ctx->name, DAV_CTX_LOCKENTRY)) {
1096                        if ((*lock_flags & DAV_PROP_LOCKEX) &&
1097                            (*lock_flags & DAV_PROP_LOCKWR)) {
1098                                *lock_flags |= DAV_LOCK_OK;
1099                        }
1100                        *lock_flags &= DAV_LOCK_OK;
1101                } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_WRITE)) {
1102                        *lock_flags |= DAV_PROP_LOCKWR;
1103                } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_EXCLUSIVE)) {
1104                        *lock_flags |= DAV_PROP_LOCKEX;
1105                }
1106        }
1107}
1108
1109static void handle_new_lock_ctx(struct xml_ctx *ctx, int tag_closed)
1110{
1111        struct remote_lock *lock = (struct remote_lock *)ctx->userData;
1112
1113        if (tag_closed && ctx->cdata) {
1114                if (!strcmp(ctx->name, DAV_ACTIVELOCK_OWNER)) {
1115                        lock->owner = xmalloc(strlen(ctx->cdata) + 1);
1116                        strcpy(lock->owner, ctx->cdata);
1117                } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TIMEOUT)) {
1118                        if (!prefixcmp(ctx->cdata, "Second-"))
1119                                lock->timeout =
1120                                        strtol(ctx->cdata + 7, NULL, 10);
1121                } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TOKEN)) {
1122                        if (!prefixcmp(ctx->cdata, "opaquelocktoken:")) {
1123                                lock->token = xmalloc(strlen(ctx->cdata) - 15);
1124                                strcpy(lock->token, ctx->cdata + 16);
1125                        }
1126                }
1127        }
1128}
1129
1130static void one_remote_ref(char *refname);
1131
1132static void
1133xml_start_tag(void *userData, const char *name, const char **atts)
1134{
1135        struct xml_ctx *ctx = (struct xml_ctx *)userData;
1136        const char *c = strchr(name, ':');
1137        int new_len;
1138
1139        if (c == NULL)
1140                c = name;
1141        else
1142                c++;
1143
1144        new_len = strlen(ctx->name) + strlen(c) + 2;
1145
1146        if (new_len > ctx->len) {
1147                ctx->name = xrealloc(ctx->name, new_len);
1148                ctx->len = new_len;
1149        }
1150        strcat(ctx->name, ".");
1151        strcat(ctx->name, c);
1152
1153        free(ctx->cdata);
1154        ctx->cdata = NULL;
1155
1156        ctx->userFunc(ctx, 0);
1157}
1158
1159static void
1160xml_end_tag(void *userData, const char *name)
1161{
1162        struct xml_ctx *ctx = (struct xml_ctx *)userData;
1163        const char *c = strchr(name, ':');
1164        char *ep;
1165
1166        ctx->userFunc(ctx, 1);
1167
1168        if (c == NULL)
1169                c = name;
1170        else
1171                c++;
1172
1173        ep = ctx->name + strlen(ctx->name) - strlen(c) - 1;
1174        *ep = 0;
1175}
1176
1177static void
1178xml_cdata(void *userData, const XML_Char *s, int len)
1179{
1180        struct xml_ctx *ctx = (struct xml_ctx *)userData;
1181        free(ctx->cdata);
1182        ctx->cdata = xmemdupz(s, len);
1183}
1184
1185static struct remote_lock *lock_remote(const char *path, long timeout)
1186{
1187        struct active_request_slot *slot;
1188        struct slot_results results;
1189        struct buffer out_buffer = { STRBUF_INIT, 0 };
1190        struct strbuf in_buffer = STRBUF_INIT;
1191        char *url;
1192        char *ep;
1193        char timeout_header[25];
1194        struct remote_lock *lock = NULL;
1195        struct curl_slist *dav_headers = NULL;
1196        struct xml_ctx ctx;
1197
1198        url = xmalloc(strlen(remote->url) + strlen(path) + 1);
1199        sprintf(url, "%s%s", remote->url, path);
1200
1201        /* Make sure leading directories exist for the remote ref */
1202        ep = strchr(url + strlen(remote->url) + 1, '/');
1203        while (ep) {
1204                *ep = 0;
1205                slot = get_active_slot();
1206                slot->results = &results;
1207                curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1208                curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1209                curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
1210                curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1211                if (start_active_slot(slot)) {
1212                        run_active_slot(slot);
1213                        if (results.curl_result != CURLE_OK &&
1214                            results.http_code != 405) {
1215                                fprintf(stderr,
1216                                        "Unable to create branch path %s\n",
1217                                        url);
1218                                free(url);
1219                                return NULL;
1220                        }
1221                } else {
1222                        fprintf(stderr, "Unable to start MKCOL request\n");
1223                        free(url);
1224                        return NULL;
1225                }
1226                *ep = '/';
1227                ep = strchr(ep + 1, '/');
1228        }
1229
1230        strbuf_addf(&out_buffer.buf, LOCK_REQUEST, git_default_email);
1231
1232        sprintf(timeout_header, "Timeout: Second-%ld", timeout);
1233        dav_headers = curl_slist_append(dav_headers, timeout_header);
1234        dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1235
1236        slot = get_active_slot();
1237        slot->results = &results;
1238        curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1239        curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1240        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1241        curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1242        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1243        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1244        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1245        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
1246        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1247
1248        lock = xcalloc(1, sizeof(*lock));
1249        lock->timeout = -1;
1250
1251        if (start_active_slot(slot)) {
1252                run_active_slot(slot);
1253                if (results.curl_result == CURLE_OK) {
1254                        XML_Parser parser = XML_ParserCreate(NULL);
1255                        enum XML_Status result;
1256                        ctx.name = xcalloc(10, 1);
1257                        ctx.len = 0;
1258                        ctx.cdata = NULL;
1259                        ctx.userFunc = handle_new_lock_ctx;
1260                        ctx.userData = lock;
1261                        XML_SetUserData(parser, &ctx);
1262                        XML_SetElementHandler(parser, xml_start_tag,
1263                                              xml_end_tag);
1264                        XML_SetCharacterDataHandler(parser, xml_cdata);
1265                        result = XML_Parse(parser, in_buffer.buf,
1266                                           in_buffer.len, 1);
1267                        free(ctx.name);
1268                        if (result != XML_STATUS_OK) {
1269                                fprintf(stderr, "XML error: %s\n",
1270                                        XML_ErrorString(
1271                                                XML_GetErrorCode(parser)));
1272                                lock->timeout = -1;
1273                        }
1274                        XML_ParserFree(parser);
1275                }
1276        } else {
1277                fprintf(stderr, "Unable to start LOCK request\n");
1278        }
1279
1280        curl_slist_free_all(dav_headers);
1281        strbuf_release(&out_buffer.buf);
1282        strbuf_release(&in_buffer);
1283
1284        if (lock->token == NULL || lock->timeout <= 0) {
1285                free(lock->token);
1286                free(lock->owner);
1287                free(url);
1288                free(lock);
1289                lock = NULL;
1290        } else {
1291                lock->url = url;
1292                lock->start_time = time(NULL);
1293                lock->next = remote->locks;
1294                remote->locks = lock;
1295        }
1296
1297        return lock;
1298}
1299
1300static int unlock_remote(struct remote_lock *lock)
1301{
1302        struct active_request_slot *slot;
1303        struct slot_results results;
1304        struct remote_lock *prev = remote->locks;
1305        char *lock_token_header;
1306        struct curl_slist *dav_headers = NULL;
1307        int rc = 0;
1308
1309        lock_token_header = xmalloc(strlen(lock->token) + 31);
1310        sprintf(lock_token_header, "Lock-Token: <opaquelocktoken:%s>",
1311                lock->token);
1312        dav_headers = curl_slist_append(dav_headers, lock_token_header);
1313
1314        slot = get_active_slot();
1315        slot->results = &results;
1316        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1317        curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1318        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_UNLOCK);
1319        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1320
1321        if (start_active_slot(slot)) {
1322                run_active_slot(slot);
1323                if (results.curl_result == CURLE_OK)
1324                        rc = 1;
1325                else
1326                        fprintf(stderr, "UNLOCK HTTP error %ld\n",
1327                                results.http_code);
1328        } else {
1329                fprintf(stderr, "Unable to start UNLOCK request\n");
1330        }
1331
1332        curl_slist_free_all(dav_headers);
1333        free(lock_token_header);
1334
1335        if (remote->locks == lock) {
1336                remote->locks = lock->next;
1337        } else {
1338                while (prev && prev->next != lock)
1339                        prev = prev->next;
1340                if (prev)
1341                        prev->next = prev->next->next;
1342        }
1343
1344        free(lock->owner);
1345        free(lock->url);
1346        free(lock->token);
1347        free(lock);
1348
1349        return rc;
1350}
1351
1352static void remove_locks(void)
1353{
1354        struct remote_lock *lock = remote->locks;
1355
1356        fprintf(stderr, "Removing remote locks...\n");
1357        while (lock) {
1358                unlock_remote(lock);
1359                lock = lock->next;
1360        }
1361}
1362
1363static void remove_locks_on_signal(int signo)
1364{
1365        remove_locks();
1366        signal(signo, SIG_DFL);
1367        raise(signo);
1368}
1369
1370static void remote_ls(const char *path, int flags,
1371                      void (*userFunc)(struct remote_ls_ctx *ls),
1372                      void *userData);
1373
1374static void process_ls_object(struct remote_ls_ctx *ls)
1375{
1376        unsigned int *parent = (unsigned int *)ls->userData;
1377        char *path = ls->dentry_name;
1378        char *obj_hex;
1379
1380        if (!strcmp(ls->path, ls->dentry_name) && (ls->flags & IS_DIR)) {
1381                remote_dir_exists[*parent] = 1;
1382                return;
1383        }
1384
1385        if (strlen(path) != 49)
1386                return;
1387        path += 8;
1388        obj_hex = xmalloc(strlen(path));
1389        /* NB: path is not null-terminated, can not use strlcpy here */
1390        memcpy(obj_hex, path, 2);
1391        strcpy(obj_hex + 2, path + 3);
1392        one_remote_object(obj_hex);
1393        free(obj_hex);
1394}
1395
1396static void process_ls_ref(struct remote_ls_ctx *ls)
1397{
1398        if (!strcmp(ls->path, ls->dentry_name) && (ls->dentry_flags & IS_DIR)) {
1399                fprintf(stderr, "  %s\n", ls->dentry_name);
1400                return;
1401        }
1402
1403        if (!(ls->dentry_flags & IS_DIR))
1404                one_remote_ref(ls->dentry_name);
1405}
1406
1407static void handle_remote_ls_ctx(struct xml_ctx *ctx, int tag_closed)
1408{
1409        struct remote_ls_ctx *ls = (struct remote_ls_ctx *)ctx->userData;
1410
1411        if (tag_closed) {
1412                if (!strcmp(ctx->name, DAV_PROPFIND_RESP) && ls->dentry_name) {
1413                        if (ls->dentry_flags & IS_DIR) {
1414                                if (ls->flags & PROCESS_DIRS) {
1415                                        ls->userFunc(ls);
1416                                }
1417                                if (strcmp(ls->dentry_name, ls->path) &&
1418                                    ls->flags & RECURSIVE) {
1419                                        remote_ls(ls->dentry_name,
1420                                                  ls->flags,
1421                                                  ls->userFunc,
1422                                                  ls->userData);
1423                                }
1424                        } else if (ls->flags & PROCESS_FILES) {
1425                                ls->userFunc(ls);
1426                        }
1427                } else if (!strcmp(ctx->name, DAV_PROPFIND_NAME) && ctx->cdata) {
1428                        ls->dentry_name = xmalloc(strlen(ctx->cdata) -
1429                                                  remote->path_len + 1);
1430                        strcpy(ls->dentry_name, ctx->cdata + remote->path_len);
1431                } else if (!strcmp(ctx->name, DAV_PROPFIND_COLLECTION)) {
1432                        ls->dentry_flags |= IS_DIR;
1433                }
1434        } else if (!strcmp(ctx->name, DAV_PROPFIND_RESP)) {
1435                free(ls->dentry_name);
1436                ls->dentry_name = NULL;
1437                ls->dentry_flags = 0;
1438        }
1439}
1440
1441static void remote_ls(const char *path, int flags,
1442                      void (*userFunc)(struct remote_ls_ctx *ls),
1443                      void *userData)
1444{
1445        char *url = xmalloc(strlen(remote->url) + strlen(path) + 1);
1446        struct active_request_slot *slot;
1447        struct slot_results results;
1448        struct strbuf in_buffer = STRBUF_INIT;
1449        struct buffer out_buffer = { STRBUF_INIT, 0 };
1450        struct curl_slist *dav_headers = NULL;
1451        struct xml_ctx ctx;
1452        struct remote_ls_ctx ls;
1453
1454        ls.flags = flags;
1455        ls.path = xstrdup(path);
1456        ls.dentry_name = NULL;
1457        ls.dentry_flags = 0;
1458        ls.userData = userData;
1459        ls.userFunc = userFunc;
1460
1461        sprintf(url, "%s%s", remote->url, path);
1462
1463        strbuf_addf(&out_buffer.buf, PROPFIND_ALL_REQUEST);
1464
1465        dav_headers = curl_slist_append(dav_headers, "Depth: 1");
1466        dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1467
1468        slot = get_active_slot();
1469        slot->results = &results;
1470        curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1471        curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1472        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1473        curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1474        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1475        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1476        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1477        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1478        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1479
1480        if (start_active_slot(slot)) {
1481                run_active_slot(slot);
1482                if (results.curl_result == CURLE_OK) {
1483                        XML_Parser parser = XML_ParserCreate(NULL);
1484                        enum XML_Status result;
1485                        ctx.name = xcalloc(10, 1);
1486                        ctx.len = 0;
1487                        ctx.cdata = NULL;
1488                        ctx.userFunc = handle_remote_ls_ctx;
1489                        ctx.userData = &ls;
1490                        XML_SetUserData(parser, &ctx);
1491                        XML_SetElementHandler(parser, xml_start_tag,
1492                                              xml_end_tag);
1493                        XML_SetCharacterDataHandler(parser, xml_cdata);
1494                        result = XML_Parse(parser, in_buffer.buf,
1495                                           in_buffer.len, 1);
1496                        free(ctx.name);
1497
1498                        if (result != XML_STATUS_OK) {
1499                                fprintf(stderr, "XML error: %s\n",
1500                                        XML_ErrorString(
1501                                                XML_GetErrorCode(parser)));
1502                        }
1503                        XML_ParserFree(parser);
1504                }
1505        } else {
1506                fprintf(stderr, "Unable to start PROPFIND request\n");
1507        }
1508
1509        free(ls.path);
1510        free(url);
1511        strbuf_release(&out_buffer.buf);
1512        strbuf_release(&in_buffer);
1513        curl_slist_free_all(dav_headers);
1514}
1515
1516static void get_remote_object_list(unsigned char parent)
1517{
1518        char path[] = "objects/XX/";
1519        static const char hex[] = "0123456789abcdef";
1520        unsigned int val = parent;
1521
1522        path[8] = hex[val >> 4];
1523        path[9] = hex[val & 0xf];
1524        remote_dir_exists[val] = 0;
1525        remote_ls(path, (PROCESS_FILES | PROCESS_DIRS),
1526                  process_ls_object, &val);
1527}
1528
1529static int locking_available(void)
1530{
1531        struct active_request_slot *slot;
1532        struct slot_results results;
1533        struct strbuf in_buffer = STRBUF_INIT;
1534        struct buffer out_buffer = { STRBUF_INIT, 0 };
1535        struct curl_slist *dav_headers = NULL;
1536        struct xml_ctx ctx;
1537        int lock_flags = 0;
1538
1539        strbuf_addf(&out_buffer.buf, PROPFIND_SUPPORTEDLOCK_REQUEST, remote->url);
1540
1541        dav_headers = curl_slist_append(dav_headers, "Depth: 0");
1542        dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1543
1544        slot = get_active_slot();
1545        slot->results = &results;
1546        curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1547        curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1548        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1549        curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1550        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1551        curl_easy_setopt(slot->curl, CURLOPT_URL, remote->url);
1552        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1553        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1554        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1555
1556        if (start_active_slot(slot)) {
1557                run_active_slot(slot);
1558                if (results.curl_result == CURLE_OK) {
1559                        XML_Parser parser = XML_ParserCreate(NULL);
1560                        enum XML_Status result;
1561                        ctx.name = xcalloc(10, 1);
1562                        ctx.len = 0;
1563                        ctx.cdata = NULL;
1564                        ctx.userFunc = handle_lockprop_ctx;
1565                        ctx.userData = &lock_flags;
1566                        XML_SetUserData(parser, &ctx);
1567                        XML_SetElementHandler(parser, xml_start_tag,
1568                                              xml_end_tag);
1569                        result = XML_Parse(parser, in_buffer.buf,
1570                                           in_buffer.len, 1);
1571                        free(ctx.name);
1572
1573                        if (result != XML_STATUS_OK) {
1574                                fprintf(stderr, "XML error: %s\n",
1575                                        XML_ErrorString(
1576                                                XML_GetErrorCode(parser)));
1577                                lock_flags = 0;
1578                        }
1579                        XML_ParserFree(parser);
1580                        if (!lock_flags)
1581                                error("Error: no DAV locking support on %s",
1582                                      remote->url);
1583
1584                } else {
1585                        error("Cannot access URL %s, return code %d",
1586                              remote->url, results.curl_result);
1587                        lock_flags = 0;
1588                }
1589        } else {
1590                error("Unable to start PROPFIND request on %s", remote->url);
1591        }
1592
1593        strbuf_release(&out_buffer.buf);
1594        strbuf_release(&in_buffer);
1595        curl_slist_free_all(dav_headers);
1596
1597        return lock_flags;
1598}
1599
1600static struct object_list **add_one_object(struct object *obj, struct object_list **p)
1601{
1602        struct object_list *entry = xmalloc(sizeof(struct object_list));
1603        entry->item = obj;
1604        entry->next = *p;
1605        *p = entry;
1606        return &entry->next;
1607}
1608
1609static struct object_list **process_blob(struct blob *blob,
1610                                         struct object_list **p,
1611                                         struct name_path *path,
1612                                         const char *name)
1613{
1614        struct object *obj = &blob->object;
1615
1616        obj->flags |= LOCAL;
1617
1618        if (obj->flags & (UNINTERESTING | SEEN))
1619                return p;
1620
1621        obj->flags |= SEEN;
1622        return add_one_object(obj, p);
1623}
1624
1625static struct object_list **process_tree(struct tree *tree,
1626                                         struct object_list **p,
1627                                         struct name_path *path,
1628                                         const char *name)
1629{
1630        struct object *obj = &tree->object;
1631        struct tree_desc desc;
1632        struct name_entry entry;
1633        struct name_path me;
1634
1635        obj->flags |= LOCAL;
1636
1637        if (obj->flags & (UNINTERESTING | SEEN))
1638                return p;
1639        if (parse_tree(tree) < 0)
1640                die("bad tree object %s", sha1_to_hex(obj->sha1));
1641
1642        obj->flags |= SEEN;
1643        name = xstrdup(name);
1644        p = add_one_object(obj, p);
1645        me.up = path;
1646        me.elem = name;
1647        me.elem_len = strlen(name);
1648
1649        init_tree_desc(&desc, tree->buffer, tree->size);
1650
1651        while (tree_entry(&desc, &entry))
1652                switch (object_type(entry.mode)) {
1653                case OBJ_TREE:
1654                        p = process_tree(lookup_tree(entry.sha1), p, &me, name);
1655                        break;
1656                case OBJ_BLOB:
1657                        p = process_blob(lookup_blob(entry.sha1), p, &me, name);
1658                        break;
1659                default:
1660                        /* Subproject commit - not in this repository */
1661                        break;
1662                }
1663
1664        free(tree->buffer);
1665        tree->buffer = NULL;
1666        return p;
1667}
1668
1669static int get_delta(struct rev_info *revs, struct remote_lock *lock)
1670{
1671        int i;
1672        struct commit *commit;
1673        struct object_list **p = &objects;
1674        int count = 0;
1675
1676        while ((commit = get_revision(revs)) != NULL) {
1677                p = process_tree(commit->tree, p, NULL, "");
1678                commit->object.flags |= LOCAL;
1679                if (!(commit->object.flags & UNINTERESTING))
1680                        count += add_send_request(&commit->object, lock);
1681        }
1682
1683        for (i = 0; i < revs->pending.nr; i++) {
1684                struct object_array_entry *entry = revs->pending.objects + i;
1685                struct object *obj = entry->item;
1686                const char *name = entry->name;
1687
1688                if (obj->flags & (UNINTERESTING | SEEN))
1689                        continue;
1690                if (obj->type == OBJ_TAG) {
1691                        obj->flags |= SEEN;
1692                        p = add_one_object(obj, p);
1693                        continue;
1694                }
1695                if (obj->type == OBJ_TREE) {
1696                        p = process_tree((struct tree *)obj, p, NULL, name);
1697                        continue;
1698                }
1699                if (obj->type == OBJ_BLOB) {
1700                        p = process_blob((struct blob *)obj, p, NULL, name);
1701                        continue;
1702                }
1703                die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
1704        }
1705
1706        while (objects) {
1707                if (!(objects->item->flags & UNINTERESTING))
1708                        count += add_send_request(objects->item, lock);
1709                objects = objects->next;
1710        }
1711
1712        return count;
1713}
1714
1715static int update_remote(unsigned char *sha1, struct remote_lock *lock)
1716{
1717        struct active_request_slot *slot;
1718        struct slot_results results;
1719        char *if_header;
1720        struct buffer out_buffer = { STRBUF_INIT, 0 };
1721        struct curl_slist *dav_headers = NULL;
1722
1723        if_header = xmalloc(strlen(lock->token) + 25);
1724        sprintf(if_header, "If: (<opaquelocktoken:%s>)", lock->token);
1725        dav_headers = curl_slist_append(dav_headers, if_header);
1726
1727        strbuf_addf(&out_buffer.buf, "%s\n", sha1_to_hex(sha1));
1728
1729        slot = get_active_slot();
1730        slot->results = &results;
1731        curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1732        curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1733        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1734        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1735        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
1736        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1737        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1738        curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
1739        curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1740
1741        if (start_active_slot(slot)) {
1742                run_active_slot(slot);
1743                strbuf_release(&out_buffer.buf);
1744                free(if_header);
1745                if (results.curl_result != CURLE_OK) {
1746                        fprintf(stderr,
1747                                "PUT error: curl result=%d, HTTP code=%ld\n",
1748                                results.curl_result, results.http_code);
1749                        /* We should attempt recovery? */
1750                        return 0;
1751                }
1752        } else {
1753                strbuf_release(&out_buffer.buf);
1754                free(if_header);
1755                fprintf(stderr, "Unable to start PUT request\n");
1756                return 0;
1757        }
1758
1759        return 1;
1760}
1761
1762static struct ref *local_refs, **local_tail;
1763static struct ref *remote_refs, **remote_tail;
1764
1765static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
1766{
1767        struct ref *ref;
1768        int len = strlen(refname) + 1;
1769        ref = xcalloc(1, sizeof(*ref) + len);
1770        hashcpy(ref->new_sha1, sha1);
1771        memcpy(ref->name, refname, len);
1772        *local_tail = ref;
1773        local_tail = &ref->next;
1774        return 0;
1775}
1776
1777static void one_remote_ref(char *refname)
1778{
1779        struct ref *ref;
1780        struct object *obj;
1781
1782        ref = alloc_ref_from_str(refname);
1783
1784        if (http_fetch_ref(remote->url, ref) != 0) {
1785                fprintf(stderr,
1786                        "Unable to fetch ref %s from %s\n",
1787                        refname, remote->url);
1788                free(ref);
1789                return;
1790        }
1791
1792        /*
1793         * Fetch a copy of the object if it doesn't exist locally - it
1794         * may be required for updating server info later.
1795         */
1796        if (remote->can_update_info_refs && !has_sha1_file(ref->old_sha1)) {
1797                obj = lookup_unknown_object(ref->old_sha1);
1798                if (obj) {
1799                        fprintf(stderr, "  fetch %s for %s\n",
1800                                sha1_to_hex(ref->old_sha1), refname);
1801                        add_fetch_request(obj);
1802                }
1803        }
1804
1805        *remote_tail = ref;
1806        remote_tail = &ref->next;
1807}
1808
1809static void get_local_heads(void)
1810{
1811        local_tail = &local_refs;
1812        for_each_ref(one_local_ref, NULL);
1813}
1814
1815static void get_dav_remote_heads(void)
1816{
1817        remote_tail = &remote_refs;
1818        remote_ls("refs/", (PROCESS_FILES | PROCESS_DIRS | RECURSIVE), process_ls_ref, NULL);
1819}
1820
1821static int is_zero_sha1(const unsigned char *sha1)
1822{
1823        int i;
1824
1825        for (i = 0; i < 20; i++) {
1826                if (*sha1++)
1827                        return 0;
1828        }
1829        return 1;
1830}
1831
1832static void unmark_and_free(struct commit_list *list, unsigned int mark)
1833{
1834        while (list) {
1835                struct commit_list *temp = list;
1836                temp->item->object.flags &= ~mark;
1837                list = temp->next;
1838                free(temp);
1839        }
1840}
1841
1842static int ref_newer(const unsigned char *new_sha1,
1843                     const unsigned char *old_sha1)
1844{
1845        struct object *o;
1846        struct commit *old, *new;
1847        struct commit_list *list, *used;
1848        int found = 0;
1849
1850        /* Both new and old must be commit-ish and new is descendant of
1851         * old.  Otherwise we require --force.
1852         */
1853        o = deref_tag(parse_object(old_sha1), NULL, 0);
1854        if (!o || o->type != OBJ_COMMIT)
1855                return 0;
1856        old = (struct commit *) o;
1857
1858        o = deref_tag(parse_object(new_sha1), NULL, 0);
1859        if (!o || o->type != OBJ_COMMIT)
1860                return 0;
1861        new = (struct commit *) o;
1862
1863        if (parse_commit(new) < 0)
1864                return 0;
1865
1866        used = list = NULL;
1867        commit_list_insert(new, &list);
1868        while (list) {
1869                new = pop_most_recent_commit(&list, TMP_MARK);
1870                commit_list_insert(new, &used);
1871                if (new == old) {
1872                        found = 1;
1873                        break;
1874                }
1875        }
1876        unmark_and_free(list, TMP_MARK);
1877        unmark_and_free(used, TMP_MARK);
1878        return found;
1879}
1880
1881static void mark_edge_parents_uninteresting(struct commit *commit)
1882{
1883        struct commit_list *parents;
1884
1885        for (parents = commit->parents; parents; parents = parents->next) {
1886                struct commit *parent = parents->item;
1887                if (!(parent->object.flags & UNINTERESTING))
1888                        continue;
1889                mark_tree_uninteresting(parent->tree);
1890        }
1891}
1892
1893static void mark_edges_uninteresting(struct commit_list *list)
1894{
1895        for ( ; list; list = list->next) {
1896                struct commit *commit = list->item;
1897
1898                if (commit->object.flags & UNINTERESTING) {
1899                        mark_tree_uninteresting(commit->tree);
1900                        continue;
1901                }
1902                mark_edge_parents_uninteresting(commit);
1903        }
1904}
1905
1906static void add_remote_info_ref(struct remote_ls_ctx *ls)
1907{
1908        struct strbuf *buf = (struct strbuf *)ls->userData;
1909        struct object *o;
1910        int len;
1911        char *ref_info;
1912        struct ref *ref;
1913
1914        ref = alloc_ref_from_str(ls->dentry_name);
1915
1916        if (http_fetch_ref(remote->url, ref) != 0) {
1917                fprintf(stderr,
1918                        "Unable to fetch ref %s from %s\n",
1919                        ls->dentry_name, remote->url);
1920                aborted = 1;
1921                free(ref);
1922                return;
1923        }
1924
1925        o = parse_object(ref->old_sha1);
1926        if (!o) {
1927                fprintf(stderr,
1928                        "Unable to parse object %s for remote ref %s\n",
1929                        sha1_to_hex(ref->old_sha1), ls->dentry_name);
1930                aborted = 1;
1931                free(ref);
1932                return;
1933        }
1934
1935        len = strlen(ls->dentry_name) + 42;
1936        ref_info = xcalloc(len + 1, 1);
1937        sprintf(ref_info, "%s   %s\n",
1938                sha1_to_hex(ref->old_sha1), ls->dentry_name);
1939        fwrite_buffer(ref_info, 1, len, buf);
1940        free(ref_info);
1941
1942        if (o->type == OBJ_TAG) {
1943                o = deref_tag(o, ls->dentry_name, 0);
1944                if (o) {
1945                        len = strlen(ls->dentry_name) + 45;
1946                        ref_info = xcalloc(len + 1, 1);
1947                        sprintf(ref_info, "%s   %s^{}\n",
1948                                sha1_to_hex(o->sha1), ls->dentry_name);
1949                        fwrite_buffer(ref_info, 1, len, buf);
1950                        free(ref_info);
1951                }
1952        }
1953        free(ref);
1954}
1955
1956static void update_remote_info_refs(struct remote_lock *lock)
1957{
1958        struct buffer buffer = { STRBUF_INIT, 0 };
1959        struct active_request_slot *slot;
1960        struct slot_results results;
1961        char *if_header;
1962        struct curl_slist *dav_headers = NULL;
1963
1964        remote_ls("refs/", (PROCESS_FILES | RECURSIVE),
1965                  add_remote_info_ref, &buffer.buf);
1966        if (!aborted) {
1967                if_header = xmalloc(strlen(lock->token) + 25);
1968                sprintf(if_header, "If: (<opaquelocktoken:%s>)", lock->token);
1969                dav_headers = curl_slist_append(dav_headers, if_header);
1970
1971                slot = get_active_slot();
1972                slot->results = &results;
1973                curl_easy_setopt(slot->curl, CURLOPT_INFILE, &buffer);
1974                curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, buffer.buf.len);
1975                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1976                curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1977                curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
1978                curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1979                curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1980                curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
1981                curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1982
1983                if (start_active_slot(slot)) {
1984                        run_active_slot(slot);
1985                        if (results.curl_result != CURLE_OK) {
1986                                fprintf(stderr,
1987                                        "PUT error: curl result=%d, HTTP code=%ld\n",
1988                                        results.curl_result, results.http_code);
1989                        }
1990                }
1991                free(if_header);
1992        }
1993        strbuf_release(&buffer.buf);
1994}
1995
1996static int remote_exists(const char *path)
1997{
1998        char *url = xmalloc(strlen(remote->url) + strlen(path) + 1);
1999        struct active_request_slot *slot;
2000        struct slot_results results;
2001        int ret = -1;
2002
2003        sprintf(url, "%s%s", remote->url, path);
2004
2005        slot = get_active_slot();
2006        slot->results = &results;
2007        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2008        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
2009
2010        if (start_active_slot(slot)) {
2011                run_active_slot(slot);
2012                if (results.http_code == 404)
2013                        ret = 0;
2014                else if (results.curl_result == CURLE_OK)
2015                        ret = 1;
2016                else
2017                        fprintf(stderr, "HEAD HTTP error %ld\n", results.http_code);
2018        } else {
2019                fprintf(stderr, "Unable to start HEAD request\n");
2020        }
2021
2022        free(url);
2023        return ret;
2024}
2025
2026static void fetch_symref(const char *path, char **symref, unsigned char *sha1)
2027{
2028        char *url;
2029        struct strbuf buffer = STRBUF_INIT;
2030        struct active_request_slot *slot;
2031        struct slot_results results;
2032
2033        url = xmalloc(strlen(remote->url) + strlen(path) + 1);
2034        sprintf(url, "%s%s", remote->url, path);
2035
2036        slot = get_active_slot();
2037        slot->results = &results;
2038        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
2039        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
2040        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
2041        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2042        if (start_active_slot(slot)) {
2043                run_active_slot(slot);
2044                if (results.curl_result != CURLE_OK) {
2045                        die("Couldn't get %s for remote symref\n%s",
2046                            url, curl_errorstr);
2047                }
2048        } else {
2049                die("Unable to start remote symref request");
2050        }
2051        free(url);
2052
2053        free(*symref);
2054        *symref = NULL;
2055        hashclr(sha1);
2056
2057        if (buffer.len == 0)
2058                return;
2059
2060        /* If it's a symref, set the refname; otherwise try for a sha1 */
2061        if (!prefixcmp((char *)buffer.buf, "ref: ")) {
2062                *symref = xmemdupz((char *)buffer.buf + 5, buffer.len - 6);
2063        } else {
2064                get_sha1_hex(buffer.buf, sha1);
2065        }
2066
2067        strbuf_release(&buffer);
2068}
2069
2070static int verify_merge_base(unsigned char *head_sha1, unsigned char *branch_sha1)
2071{
2072        struct commit *head = lookup_commit(head_sha1);
2073        struct commit *branch = lookup_commit(branch_sha1);
2074        struct commit_list *merge_bases = get_merge_bases(head, branch, 1);
2075
2076        return (merge_bases && !merge_bases->next && merge_bases->item == branch);
2077}
2078
2079static int delete_remote_branch(char *pattern, int force)
2080{
2081        struct ref *refs = remote_refs;
2082        struct ref *remote_ref = NULL;
2083        unsigned char head_sha1[20];
2084        char *symref = NULL;
2085        int match;
2086        int patlen = strlen(pattern);
2087        int i;
2088        struct active_request_slot *slot;
2089        struct slot_results results;
2090        char *url;
2091
2092        /* Find the remote branch(es) matching the specified branch name */
2093        for (match = 0; refs; refs = refs->next) {
2094                char *name = refs->name;
2095                int namelen = strlen(name);
2096                if (namelen < patlen ||
2097                    memcmp(name + namelen - patlen, pattern, patlen))
2098                        continue;
2099                if (namelen != patlen && name[namelen - patlen - 1] != '/')
2100                        continue;
2101                match++;
2102                remote_ref = refs;
2103        }
2104        if (match == 0)
2105                return error("No remote branch matches %s", pattern);
2106        if (match != 1)
2107                return error("More than one remote branch matches %s",
2108                             pattern);
2109
2110        /*
2111         * Remote HEAD must be a symref (not exactly foolproof; a remote
2112         * symlink to a symref will look like a symref)
2113         */
2114        fetch_symref("HEAD", &symref, head_sha1);
2115        if (!symref)
2116                return error("Remote HEAD is not a symref");
2117
2118        /* Remote branch must not be the remote HEAD */
2119        for (i=0; symref && i<MAXDEPTH; i++) {
2120                if (!strcmp(remote_ref->name, symref))
2121                        return error("Remote branch %s is the current HEAD",
2122                                     remote_ref->name);
2123                fetch_symref(symref, &symref, head_sha1);
2124        }
2125
2126        /* Run extra sanity checks if delete is not forced */
2127        if (!force) {
2128                /* Remote HEAD must resolve to a known object */
2129                if (symref)
2130                        return error("Remote HEAD symrefs too deep");
2131                if (is_zero_sha1(head_sha1))
2132                        return error("Unable to resolve remote HEAD");
2133                if (!has_sha1_file(head_sha1))
2134                        return error("Remote HEAD resolves to object %s\nwhich does not exist locally, perhaps you need to fetch?", sha1_to_hex(head_sha1));
2135
2136                /* Remote branch must resolve to a known object */
2137                if (is_zero_sha1(remote_ref->old_sha1))
2138                        return error("Unable to resolve remote branch %s",
2139                                     remote_ref->name);
2140                if (!has_sha1_file(remote_ref->old_sha1))
2141                        return error("Remote branch %s resolves to object %s\nwhich does not exist locally, perhaps you need to fetch?", remote_ref->name, sha1_to_hex(remote_ref->old_sha1));
2142
2143                /* Remote branch must be an ancestor of remote HEAD */
2144                if (!verify_merge_base(head_sha1, remote_ref->old_sha1)) {
2145                        return error("The branch '%s' is not an ancestor "
2146                                     "of your current HEAD.\n"
2147                                     "If you are sure you want to delete it,"
2148                                     " run:\n\t'git http-push -D %s %s'",
2149                                     remote_ref->name, remote->url, pattern);
2150                }
2151        }
2152
2153        /* Send delete request */
2154        fprintf(stderr, "Removing remote branch '%s'\n", remote_ref->name);
2155        if (dry_run)
2156                return 0;
2157        url = xmalloc(strlen(remote->url) + strlen(remote_ref->name) + 1);
2158        sprintf(url, "%s%s", remote->url, remote_ref->name);
2159        slot = get_active_slot();
2160        slot->results = &results;
2161        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
2162        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
2163        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2164        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_DELETE);
2165        if (start_active_slot(slot)) {
2166                run_active_slot(slot);
2167                free(url);
2168                if (results.curl_result != CURLE_OK)
2169                        return error("DELETE request failed (%d/%ld)\n",
2170                                     results.curl_result, results.http_code);
2171        } else {
2172                free(url);
2173                return error("Unable to start DELETE request");
2174        }
2175
2176        return 0;
2177}
2178
2179int main(int argc, char **argv)
2180{
2181        struct transfer_request *request;
2182        struct transfer_request *next_request;
2183        int nr_refspec = 0;
2184        char **refspec = NULL;
2185        struct remote_lock *ref_lock = NULL;
2186        struct remote_lock *info_ref_lock = NULL;
2187        struct rev_info revs;
2188        int delete_branch = 0;
2189        int force_delete = 0;
2190        int objects_to_send;
2191        int rc = 0;
2192        int i;
2193        int new_refs;
2194        struct ref *ref;
2195        char *rewritten_url = NULL;
2196
2197        setup_git_directory();
2198
2199        remote = xcalloc(sizeof(*remote), 1);
2200
2201        argv++;
2202        for (i = 1; i < argc; i++, argv++) {
2203                char *arg = *argv;
2204
2205                if (*arg == '-') {
2206                        if (!strcmp(arg, "--all")) {
2207                                push_all = MATCH_REFS_ALL;
2208                                continue;
2209                        }
2210                        if (!strcmp(arg, "--force")) {
2211                                force_all = 1;
2212                                continue;
2213                        }
2214                        if (!strcmp(arg, "--dry-run")) {
2215                                dry_run = 1;
2216                                continue;
2217                        }
2218                        if (!strcmp(arg, "--verbose")) {
2219                                push_verbosely = 1;
2220                                continue;
2221                        }
2222                        if (!strcmp(arg, "-d")) {
2223                                delete_branch = 1;
2224                                continue;
2225                        }
2226                        if (!strcmp(arg, "-D")) {
2227                                delete_branch = 1;
2228                                force_delete = 1;
2229                                continue;
2230                        }
2231                }
2232                if (!remote->url) {
2233                        char *path = strstr(arg, "//");
2234                        remote->url = arg;
2235                        if (path) {
2236                                path = strchr(path+2, '/');
2237                                if (path)
2238                                        remote->path_len = strlen(path);
2239                        }
2240                        continue;
2241                }
2242                refspec = argv;
2243                nr_refspec = argc - i;
2244                break;
2245        }
2246
2247#ifndef USE_CURL_MULTI
2248        die("git-push is not available for http/https repository when not compiled with USE_CURL_MULTI");
2249#endif
2250
2251        if (!remote->url)
2252                usage(http_push_usage);
2253
2254        if (delete_branch && nr_refspec != 1)
2255                die("You must specify only one branch name when deleting a remote branch");
2256
2257        memset(remote_dir_exists, -1, 256);
2258
2259        http_init(NULL);
2260
2261        no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
2262
2263        if (remote->url && remote->url[strlen(remote->url)-1] != '/') {
2264                rewritten_url = malloc(strlen(remote->url)+2);
2265                strcpy(rewritten_url, remote->url);
2266                strcat(rewritten_url, "/");
2267                remote->url = rewritten_url;
2268                ++remote->path_len;
2269        }
2270
2271        /* Verify DAV compliance/lock support */
2272        if (!locking_available()) {
2273                rc = 1;
2274                goto cleanup;
2275        }
2276
2277        signal(SIGINT, remove_locks_on_signal);
2278        signal(SIGHUP, remove_locks_on_signal);
2279        signal(SIGQUIT, remove_locks_on_signal);
2280
2281        /* Check whether the remote has server info files */
2282        remote->can_update_info_refs = 0;
2283        remote->has_info_refs = remote_exists("info/refs");
2284        remote->has_info_packs = remote_exists("objects/info/packs");
2285        if (remote->has_info_refs) {
2286                info_ref_lock = lock_remote("info/refs", LOCK_TIME);
2287                if (info_ref_lock)
2288                        remote->can_update_info_refs = 1;
2289                else {
2290                        fprintf(stderr, "Error: cannot lock existing info/refs\n");
2291                        rc = 1;
2292                        goto cleanup;
2293                }
2294        }
2295        if (remote->has_info_packs)
2296                fetch_indices();
2297
2298        /* Get a list of all local and remote heads to validate refspecs */
2299        get_local_heads();
2300        fprintf(stderr, "Fetching remote heads...\n");
2301        get_dav_remote_heads();
2302
2303        /* Remove a remote branch if -d or -D was specified */
2304        if (delete_branch) {
2305                if (delete_remote_branch(refspec[0], force_delete) == -1)
2306                        fprintf(stderr, "Unable to delete remote branch %s\n",
2307                                refspec[0]);
2308                goto cleanup;
2309        }
2310
2311        /* match them up */
2312        if (!remote_tail)
2313                remote_tail = &remote_refs;
2314        if (match_refs(local_refs, remote_refs, &remote_tail,
2315                       nr_refspec, (const char **) refspec, push_all)) {
2316                rc = -1;
2317                goto cleanup;
2318        }
2319        if (!remote_refs) {
2320                fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
2321                rc = 0;
2322                goto cleanup;
2323        }
2324
2325        new_refs = 0;
2326        for (ref = remote_refs; ref; ref = ref->next) {
2327                char old_hex[60], *new_hex;
2328                const char *commit_argv[4];
2329                int commit_argc;
2330                char *new_sha1_hex, *old_sha1_hex;
2331
2332                if (!ref->peer_ref)
2333                        continue;
2334
2335                if (is_zero_sha1(ref->peer_ref->new_sha1)) {
2336                        if (delete_remote_branch(ref->name, 1) == -1) {
2337                                error("Could not remove %s", ref->name);
2338                                rc = -4;
2339                        }
2340                        new_refs++;
2341                        continue;
2342                }
2343
2344                if (!hashcmp(ref->old_sha1, ref->peer_ref->new_sha1)) {
2345                        if (push_verbosely || 1)
2346                                fprintf(stderr, "'%s': up-to-date\n", ref->name);
2347                        continue;
2348                }
2349
2350                if (!force_all &&
2351                    !is_zero_sha1(ref->old_sha1) &&
2352                    !ref->force) {
2353                        if (!has_sha1_file(ref->old_sha1) ||
2354                            !ref_newer(ref->peer_ref->new_sha1,
2355                                       ref->old_sha1)) {
2356                                /*
2357                                 * We do not have the remote ref, or
2358                                 * we know that the remote ref is not
2359                                 * an ancestor of what we are trying to
2360                                 * push.  Either way this can be losing
2361                                 * commits at the remote end and likely
2362                                 * we were not up to date to begin with.
2363                                 */
2364                                error("remote '%s' is not an ancestor of\n"
2365                                      "local '%s'.\n"
2366                                      "Maybe you are not up-to-date and "
2367                                      "need to pull first?",
2368                                      ref->name,
2369                                      ref->peer_ref->name);
2370                                rc = -2;
2371                                continue;
2372                        }
2373                }
2374                hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
2375                new_refs++;
2376                strcpy(old_hex, sha1_to_hex(ref->old_sha1));
2377                new_hex = sha1_to_hex(ref->new_sha1);
2378
2379                fprintf(stderr, "updating '%s'", ref->name);
2380                if (strcmp(ref->name, ref->peer_ref->name))
2381                        fprintf(stderr, " using '%s'", ref->peer_ref->name);
2382                fprintf(stderr, "\n  from %s\n  to   %s\n", old_hex, new_hex);
2383                if (dry_run)
2384                        continue;
2385
2386                /* Lock remote branch ref */
2387                ref_lock = lock_remote(ref->name, LOCK_TIME);
2388                if (ref_lock == NULL) {
2389                        fprintf(stderr, "Unable to lock remote branch %s\n",
2390                                ref->name);
2391                        rc = 1;
2392                        continue;
2393                }
2394
2395                /* Set up revision info for this refspec */
2396                commit_argc = 3;
2397                new_sha1_hex = xstrdup(sha1_to_hex(ref->new_sha1));
2398                old_sha1_hex = NULL;
2399                commit_argv[1] = "--objects";
2400                commit_argv[2] = new_sha1_hex;
2401                if (!push_all && !is_zero_sha1(ref->old_sha1)) {
2402                        old_sha1_hex = xmalloc(42);
2403                        sprintf(old_sha1_hex, "^%s",
2404                                sha1_to_hex(ref->old_sha1));
2405                        commit_argv[3] = old_sha1_hex;
2406                        commit_argc++;
2407                }
2408                init_revisions(&revs, setup_git_directory());
2409                setup_revisions(commit_argc, commit_argv, &revs, NULL);
2410                free(new_sha1_hex);
2411                if (old_sha1_hex) {
2412                        free(old_sha1_hex);
2413                        commit_argv[1] = NULL;
2414                }
2415
2416                /* Generate a list of objects that need to be pushed */
2417                pushing = 0;
2418                if (prepare_revision_walk(&revs))
2419                        die("revision walk setup failed");
2420                mark_edges_uninteresting(revs.commits);
2421                objects_to_send = get_delta(&revs, ref_lock);
2422                finish_all_active_slots();
2423
2424                /* Push missing objects to remote, this would be a
2425                   convenient time to pack them first if appropriate. */
2426                pushing = 1;
2427                if (objects_to_send)
2428                        fprintf(stderr, "    sending %d objects\n",
2429                                objects_to_send);
2430#ifdef USE_CURL_MULTI
2431                fill_active_slots();
2432                add_fill_function(NULL, fill_active_slot);
2433#endif
2434                do {
2435                        finish_all_active_slots();
2436#ifdef USE_CURL_MULTI
2437                        fill_active_slots();
2438#endif
2439                } while (request_queue_head && !aborted);
2440
2441                /* Update the remote branch if all went well */
2442                if (aborted || !update_remote(ref->new_sha1, ref_lock))
2443                        rc = 1;
2444
2445                if (!rc)
2446                        fprintf(stderr, "    done\n");
2447                unlock_remote(ref_lock);
2448                check_locks();
2449        }
2450
2451        /* Update remote server info if appropriate */
2452        if (remote->has_info_refs && new_refs) {
2453                if (info_ref_lock && remote->can_update_info_refs) {
2454                        fprintf(stderr, "Updating remote server info\n");
2455                        if (!dry_run)
2456                                update_remote_info_refs(info_ref_lock);
2457                } else {
2458                        fprintf(stderr, "Unable to update server info\n");
2459                }
2460        }
2461
2462 cleanup:
2463        free(rewritten_url);
2464        if (info_ref_lock)
2465                unlock_remote(info_ref_lock);
2466        free(remote);
2467
2468        curl_slist_free_all(no_pragma_header);
2469
2470        http_cleanup();
2471
2472        request = request_queue_head;
2473        while (request != NULL) {
2474                next_request = request->next;
2475                release_request(request);
2476                request = next_request;
2477        }
2478
2479        return rc;
2480}