http-push.con commit Makefile: allow building without perl (499c293)
   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#include "list-objects.h"
  13#include "sigchain.h"
  14
  15#include <expat.h>
  16
  17static const char http_push_usage[] =
  18"git http-push [--all] [--dry-run] [--force] [--verbose] <remote> [<head>...]\n";
  19
  20#ifndef XML_STATUS_OK
  21enum XML_Status {
  22  XML_STATUS_OK = 1,
  23  XML_STATUS_ERROR = 0
  24};
  25#define XML_STATUS_OK    1
  26#define XML_STATUS_ERROR 0
  27#endif
  28
  29#define PREV_BUF_SIZE 4096
  30#define RANGE_HEADER_SIZE 30
  31
  32/* DAV methods */
  33#define DAV_LOCK "LOCK"
  34#define DAV_MKCOL "MKCOL"
  35#define DAV_MOVE "MOVE"
  36#define DAV_PROPFIND "PROPFIND"
  37#define DAV_PUT "PUT"
  38#define DAV_UNLOCK "UNLOCK"
  39#define DAV_DELETE "DELETE"
  40
  41/* DAV lock flags */
  42#define DAV_PROP_LOCKWR (1u << 0)
  43#define DAV_PROP_LOCKEX (1u << 1)
  44#define DAV_LOCK_OK (1u << 2)
  45
  46/* DAV XML properties */
  47#define DAV_CTX_LOCKENTRY ".multistatus.response.propstat.prop.supportedlock.lockentry"
  48#define DAV_CTX_LOCKTYPE_WRITE ".multistatus.response.propstat.prop.supportedlock.lockentry.locktype.write"
  49#define DAV_CTX_LOCKTYPE_EXCLUSIVE ".multistatus.response.propstat.prop.supportedlock.lockentry.lockscope.exclusive"
  50#define DAV_ACTIVELOCK_OWNER ".prop.lockdiscovery.activelock.owner.href"
  51#define DAV_ACTIVELOCK_TIMEOUT ".prop.lockdiscovery.activelock.timeout"
  52#define DAV_ACTIVELOCK_TOKEN ".prop.lockdiscovery.activelock.locktoken.href"
  53#define DAV_PROPFIND_RESP ".multistatus.response"
  54#define DAV_PROPFIND_NAME ".multistatus.response.href"
  55#define DAV_PROPFIND_COLLECTION ".multistatus.response.propstat.prop.resourcetype.collection"
  56
  57/* DAV request body templates */
  58#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>"
  59#define PROPFIND_ALL_REQUEST "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:propfind xmlns:D=\"DAV:\">\n<D:allprop/>\n</D:propfind>"
  60#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>"
  61
  62#define LOCK_TIME 600
  63#define LOCK_REFRESH 30
  64
  65/* bits #0-15 in revision.h */
  66
  67#define LOCAL    (1u<<16)
  68#define REMOTE   (1u<<17)
  69#define FETCHING (1u<<18)
  70#define PUSHING  (1u<<19)
  71
  72/* We allow "recursive" symbolic refs. Only within reason, though */
  73#define MAXDEPTH 5
  74
  75static int pushing;
  76static int aborted;
  77static signed char remote_dir_exists[256];
  78
  79static struct curl_slist *no_pragma_header;
  80
  81static int push_verbosely;
  82static int push_all = MATCH_REFS_NONE;
  83static int force_all;
  84static int dry_run;
  85
  86static struct object_list *objects;
  87
  88struct repo
  89{
  90        char *url;
  91        char *path;
  92        int path_len;
  93        int has_info_refs;
  94        int can_update_info_refs;
  95        int has_info_packs;
  96        struct packed_git *packs;
  97        struct remote_lock *locks;
  98};
  99
 100static struct repo *repo;
 101
 102enum transfer_state {
 103        NEED_FETCH,
 104        RUN_FETCH_LOOSE,
 105        RUN_FETCH_PACKED,
 106        NEED_PUSH,
 107        RUN_MKCOL,
 108        RUN_PUT,
 109        RUN_MOVE,
 110        ABORTED,
 111        COMPLETE,
 112};
 113
 114struct transfer_request
 115{
 116        struct object *obj;
 117        char *url;
 118        char *dest;
 119        struct remote_lock *lock;
 120        struct curl_slist *headers;
 121        struct buffer buffer;
 122        char filename[PATH_MAX];
 123        char tmpfile[PATH_MAX];
 124        int local_fileno;
 125        FILE *local_stream;
 126        enum transfer_state state;
 127        CURLcode curl_result;
 128        char errorstr[CURL_ERROR_SIZE];
 129        long http_code;
 130        unsigned char real_sha1[20];
 131        git_SHA_CTX c;
 132        z_stream stream;
 133        int zret;
 134        int rename;
 135        void *userData;
 136        struct active_request_slot *slot;
 137        struct transfer_request *next;
 138};
 139
 140static struct transfer_request *request_queue_head;
 141
 142struct xml_ctx
 143{
 144        char *name;
 145        int len;
 146        char *cdata;
 147        void (*userFunc)(struct xml_ctx *ctx, int tag_closed);
 148        void *userData;
 149};
 150
 151struct remote_lock
 152{
 153        char *url;
 154        char *owner;
 155        char *token;
 156        char tmpfile_suffix[41];
 157        time_t start_time;
 158        long timeout;
 159        int refreshing;
 160        struct remote_lock *next;
 161};
 162
 163/* Flags that control remote_ls processing */
 164#define PROCESS_FILES (1u << 0)
 165#define PROCESS_DIRS  (1u << 1)
 166#define RECURSIVE     (1u << 2)
 167
 168/* Flags that remote_ls passes to callback functions */
 169#define IS_DIR (1u << 0)
 170
 171struct remote_ls_ctx
 172{
 173        char *path;
 174        void (*userFunc)(struct remote_ls_ctx *ls);
 175        void *userData;
 176        int flags;
 177        char *dentry_name;
 178        int dentry_flags;
 179        struct remote_ls_ctx *parent;
 180};
 181
 182/* get_dav_token_headers options */
 183enum dav_header_flag {
 184        DAV_HEADER_IF = (1u << 0),
 185        DAV_HEADER_LOCK = (1u << 1),
 186        DAV_HEADER_TIMEOUT = (1u << 2)
 187};
 188
 189static struct curl_slist *get_dav_token_headers(struct remote_lock *lock, enum dav_header_flag options)
 190{
 191        struct strbuf buf = STRBUF_INIT;
 192        struct curl_slist *dav_headers = NULL;
 193
 194        if (options & DAV_HEADER_IF) {
 195                strbuf_addf(&buf, "If: (<%s>)", lock->token);
 196                dav_headers = curl_slist_append(dav_headers, buf.buf);
 197                strbuf_reset(&buf);
 198        }
 199        if (options & DAV_HEADER_LOCK) {
 200                strbuf_addf(&buf, "Lock-Token: <%s>", lock->token);
 201                dav_headers = curl_slist_append(dav_headers, buf.buf);
 202                strbuf_reset(&buf);
 203        }
 204        if (options & DAV_HEADER_TIMEOUT) {
 205                strbuf_addf(&buf, "Timeout: Second-%ld", lock->timeout);
 206                dav_headers = curl_slist_append(dav_headers, buf.buf);
 207                strbuf_reset(&buf);
 208        }
 209        strbuf_release(&buf);
 210
 211        return dav_headers;
 212}
 213
 214static void append_remote_object_url(struct strbuf *buf, const char *url,
 215                                     const char *hex,
 216                                     int only_two_digit_prefix)
 217{
 218        strbuf_addf(buf, "%sobjects/%.*s/", url, 2, hex);
 219        if (!only_two_digit_prefix)
 220                strbuf_addf(buf, "%s", hex+2);
 221}
 222
 223static void finish_request(struct transfer_request *request);
 224static void release_request(struct transfer_request *request);
 225
 226static void process_response(void *callback_data)
 227{
 228        struct transfer_request *request =
 229                (struct transfer_request *)callback_data;
 230
 231        finish_request(request);
 232}
 233
 234#ifdef USE_CURL_MULTI
 235
 236static char *get_remote_object_url(const char *url, const char *hex,
 237                                   int only_two_digit_prefix)
 238{
 239        struct strbuf buf = STRBUF_INIT;
 240        append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
 241        return strbuf_detach(&buf, NULL);
 242}
 243
 244static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
 245                               void *data)
 246{
 247        unsigned char expn[4096];
 248        size_t size = eltsize * nmemb;
 249        int posn = 0;
 250        struct transfer_request *request = (struct transfer_request *)data;
 251        do {
 252                ssize_t retval = xwrite(request->local_fileno,
 253                                       (char *) ptr + posn, size - posn);
 254                if (retval < 0)
 255                        return posn;
 256                posn += retval;
 257        } while (posn < size);
 258
 259        request->stream.avail_in = size;
 260        request->stream.next_in = ptr;
 261        do {
 262                request->stream.next_out = expn;
 263                request->stream.avail_out = sizeof(expn);
 264                request->zret = git_inflate(&request->stream, Z_SYNC_FLUSH);
 265                git_SHA1_Update(&request->c, expn,
 266                            sizeof(expn) - request->stream.avail_out);
 267        } while (request->stream.avail_in && request->zret == Z_OK);
 268        data_received++;
 269        return size;
 270}
 271
 272static void start_fetch_loose(struct transfer_request *request)
 273{
 274        char *hex = sha1_to_hex(request->obj->sha1);
 275        char *filename;
 276        char prevfile[PATH_MAX];
 277        char *url;
 278        int prevlocal;
 279        unsigned char prev_buf[PREV_BUF_SIZE];
 280        ssize_t prev_read = 0;
 281        long prev_posn = 0;
 282        char range[RANGE_HEADER_SIZE];
 283        struct curl_slist *range_header = NULL;
 284        struct active_request_slot *slot;
 285
 286        filename = sha1_file_name(request->obj->sha1);
 287        snprintf(request->filename, sizeof(request->filename), "%s", filename);
 288        snprintf(request->tmpfile, sizeof(request->tmpfile),
 289                 "%s.temp", filename);
 290
 291        snprintf(prevfile, sizeof(prevfile), "%s.prev", request->filename);
 292        unlink(prevfile);
 293        rename(request->tmpfile, prevfile);
 294        unlink(request->tmpfile);
 295
 296        if (request->local_fileno != -1)
 297                error("fd leakage in start: %d", request->local_fileno);
 298        request->local_fileno = open(request->tmpfile,
 299                                     O_WRONLY | O_CREAT | O_EXCL, 0666);
 300        /* This could have failed due to the "lazy directory creation";
 301         * try to mkdir the last path component.
 302         */
 303        if (request->local_fileno < 0 && errno == ENOENT) {
 304                char *dir = strrchr(request->tmpfile, '/');
 305                if (dir) {
 306                        *dir = 0;
 307                        mkdir(request->tmpfile, 0777);
 308                        *dir = '/';
 309                }
 310                request->local_fileno = open(request->tmpfile,
 311                                             O_WRONLY | O_CREAT | O_EXCL, 0666);
 312        }
 313
 314        if (request->local_fileno < 0) {
 315                request->state = ABORTED;
 316                error("Couldn't create temporary file %s for %s: %s",
 317                      request->tmpfile, request->filename, strerror(errno));
 318                return;
 319        }
 320
 321        memset(&request->stream, 0, sizeof(request->stream));
 322
 323        git_inflate_init(&request->stream);
 324
 325        git_SHA1_Init(&request->c);
 326
 327        url = get_remote_object_url(repo->url, hex, 0);
 328        request->url = xstrdup(url);
 329
 330        /* If a previous temp file is present, process what was already
 331           fetched. */
 332        prevlocal = open(prevfile, O_RDONLY);
 333        if (prevlocal != -1) {
 334                do {
 335                        prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
 336                        if (prev_read>0) {
 337                                if (fwrite_sha1_file(prev_buf,
 338                                                     1,
 339                                                     prev_read,
 340                                                     request) == prev_read) {
 341                                        prev_posn += prev_read;
 342                                } else {
 343                                        prev_read = -1;
 344                                }
 345                        }
 346                } while (prev_read > 0);
 347                close(prevlocal);
 348        }
 349        unlink(prevfile);
 350
 351        /* Reset inflate/SHA1 if there was an error reading the previous temp
 352           file; also rewind to the beginning of the local file. */
 353        if (prev_read == -1) {
 354                memset(&request->stream, 0, sizeof(request->stream));
 355                git_inflate_init(&request->stream);
 356                git_SHA1_Init(&request->c);
 357                if (prev_posn>0) {
 358                        prev_posn = 0;
 359                        lseek(request->local_fileno, 0, SEEK_SET);
 360                        ftruncate(request->local_fileno, 0);
 361                }
 362        }
 363
 364        slot = get_active_slot();
 365        slot->callback_func = process_response;
 366        slot->callback_data = request;
 367        request->slot = slot;
 368
 369        curl_easy_setopt(slot->curl, CURLOPT_FILE, request);
 370        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
 371        curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
 372        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 373        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
 374
 375        /* If we have successfully processed data from a previous fetch
 376           attempt, only fetch the data we don't already have. */
 377        if (prev_posn>0) {
 378                if (push_verbosely)
 379                        fprintf(stderr,
 380                                "Resuming fetch of object %s at byte %ld\n",
 381                                hex, prev_posn);
 382                sprintf(range, "Range: bytes=%ld-", prev_posn);
 383                range_header = curl_slist_append(range_header, range);
 384                curl_easy_setopt(slot->curl,
 385                                 CURLOPT_HTTPHEADER, range_header);
 386        }
 387
 388        /* Try to get the request started, abort the request on error */
 389        request->state = RUN_FETCH_LOOSE;
 390        if (!start_active_slot(slot)) {
 391                fprintf(stderr, "Unable to start GET request\n");
 392                repo->can_update_info_refs = 0;
 393                release_request(request);
 394        }
 395}
 396
 397static void start_mkcol(struct transfer_request *request)
 398{
 399        char *hex = sha1_to_hex(request->obj->sha1);
 400        struct active_request_slot *slot;
 401
 402        request->url = get_remote_object_url(repo->url, hex, 1);
 403
 404        slot = get_active_slot();
 405        slot->callback_func = process_response;
 406        slot->callback_data = request;
 407        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); /* undo PUT setup */
 408        curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 409        curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
 410        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
 411        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 412
 413        if (start_active_slot(slot)) {
 414                request->slot = slot;
 415                request->state = RUN_MKCOL;
 416        } else {
 417                request->state = ABORTED;
 418                free(request->url);
 419                request->url = NULL;
 420        }
 421}
 422#endif
 423
 424static void start_fetch_packed(struct transfer_request *request)
 425{
 426        char *url;
 427        struct packed_git *target;
 428        FILE *packfile;
 429        char *filename;
 430        long prev_posn = 0;
 431        char range[RANGE_HEADER_SIZE];
 432        struct curl_slist *range_header = NULL;
 433
 434        struct transfer_request *check_request = request_queue_head;
 435        struct active_request_slot *slot;
 436
 437        target = find_sha1_pack(request->obj->sha1, repo->packs);
 438        if (!target) {
 439                fprintf(stderr, "Unable to fetch %s, will not be able to update server info refs\n", sha1_to_hex(request->obj->sha1));
 440                repo->can_update_info_refs = 0;
 441                release_request(request);
 442                return;
 443        }
 444
 445        fprintf(stderr, "Fetching pack %s\n", sha1_to_hex(target->sha1));
 446        fprintf(stderr, " which contains %s\n", sha1_to_hex(request->obj->sha1));
 447
 448        filename = sha1_pack_name(target->sha1);
 449        snprintf(request->filename, sizeof(request->filename), "%s", filename);
 450        snprintf(request->tmpfile, sizeof(request->tmpfile),
 451                 "%s.temp", filename);
 452
 453        url = xmalloc(strlen(repo->url) + 64);
 454        sprintf(url, "%sobjects/pack/pack-%s.pack",
 455                repo->url, sha1_to_hex(target->sha1));
 456
 457        /* Make sure there isn't another open request for this pack */
 458        while (check_request) {
 459                if (check_request->state == RUN_FETCH_PACKED &&
 460                    !strcmp(check_request->url, url)) {
 461                        free(url);
 462                        release_request(request);
 463                        return;
 464                }
 465                check_request = check_request->next;
 466        }
 467
 468        packfile = fopen(request->tmpfile, "a");
 469        if (!packfile) {
 470                fprintf(stderr, "Unable to open local file %s for pack",
 471                        request->tmpfile);
 472                repo->can_update_info_refs = 0;
 473                free(url);
 474                return;
 475        }
 476
 477        slot = get_active_slot();
 478        slot->callback_func = process_response;
 479        slot->callback_data = request;
 480        request->slot = slot;
 481        request->local_stream = packfile;
 482        request->userData = target;
 483
 484        request->url = url;
 485        curl_easy_setopt(slot->curl, CURLOPT_FILE, packfile);
 486        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
 487        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 488        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
 489        slot->local = packfile;
 490
 491        /* If there is data present from a previous transfer attempt,
 492           resume where it left off */
 493        prev_posn = ftell(packfile);
 494        if (prev_posn>0) {
 495                if (push_verbosely)
 496                        fprintf(stderr,
 497                                "Resuming fetch of pack %s at byte %ld\n",
 498                                sha1_to_hex(target->sha1), prev_posn);
 499                sprintf(range, "Range: bytes=%ld-", prev_posn);
 500                range_header = curl_slist_append(range_header, range);
 501                curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
 502        }
 503
 504        /* Try to get the request started, abort the request on error */
 505        request->state = RUN_FETCH_PACKED;
 506        if (!start_active_slot(slot)) {
 507                fprintf(stderr, "Unable to start GET request\n");
 508                repo->can_update_info_refs = 0;
 509                release_request(request);
 510        }
 511}
 512
 513static void start_put(struct transfer_request *request)
 514{
 515        char *hex = sha1_to_hex(request->obj->sha1);
 516        struct active_request_slot *slot;
 517        struct strbuf buf = STRBUF_INIT;
 518        enum object_type type;
 519        char hdr[50];
 520        void *unpacked;
 521        unsigned long len;
 522        int hdrlen;
 523        ssize_t size;
 524        z_stream stream;
 525
 526        unpacked = read_sha1_file(request->obj->sha1, &type, &len);
 527        hdrlen = sprintf(hdr, "%s %lu", typename(type), len) + 1;
 528
 529        /* Set it up */
 530        memset(&stream, 0, sizeof(stream));
 531        deflateInit(&stream, zlib_compression_level);
 532        size = deflateBound(&stream, len + hdrlen);
 533        strbuf_init(&request->buffer.buf, size);
 534        request->buffer.posn = 0;
 535
 536        /* Compress it */
 537        stream.next_out = (unsigned char *)request->buffer.buf.buf;
 538        stream.avail_out = size;
 539
 540        /* First header.. */
 541        stream.next_in = (void *)hdr;
 542        stream.avail_in = hdrlen;
 543        while (deflate(&stream, 0) == Z_OK)
 544                /* nothing */;
 545
 546        /* Then the data itself.. */
 547        stream.next_in = unpacked;
 548        stream.avail_in = len;
 549        while (deflate(&stream, Z_FINISH) == Z_OK)
 550                /* nothing */;
 551        deflateEnd(&stream);
 552        free(unpacked);
 553
 554        request->buffer.buf.len = stream.total_out;
 555
 556        strbuf_addstr(&buf, "Destination: ");
 557        append_remote_object_url(&buf, repo->url, hex, 0);
 558        request->dest = strbuf_detach(&buf, NULL);
 559
 560        append_remote_object_url(&buf, repo->url, hex, 0);
 561        strbuf_add(&buf, request->lock->tmpfile_suffix, 41);
 562        request->url = strbuf_detach(&buf, 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_INFILE, &request->buffer);
 568        curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, request->buffer.buf.len);
 569        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
 570#ifndef NO_CURL_IOCTL
 571        curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
 572        curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &request->buffer);
 573#endif
 574        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 575        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
 576        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
 577        curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
 578        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 579        curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 580
 581        if (start_active_slot(slot)) {
 582                request->slot = slot;
 583                request->state = RUN_PUT;
 584        } else {
 585                request->state = ABORTED;
 586                free(request->url);
 587                request->url = NULL;
 588        }
 589}
 590
 591static void start_move(struct transfer_request *request)
 592{
 593        struct active_request_slot *slot;
 594        struct curl_slist *dav_headers = NULL;
 595
 596        slot = get_active_slot();
 597        slot->callback_func = process_response;
 598        slot->callback_data = request;
 599        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); /* undo PUT setup */
 600        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MOVE);
 601        dav_headers = curl_slist_append(dav_headers, request->dest);
 602        dav_headers = curl_slist_append(dav_headers, "Overwrite: T");
 603        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 604        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 605        curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 606
 607        if (start_active_slot(slot)) {
 608                request->slot = slot;
 609                request->state = RUN_MOVE;
 610        } else {
 611                request->state = ABORTED;
 612                free(request->url);
 613                request->url = NULL;
 614        }
 615}
 616
 617static int refresh_lock(struct remote_lock *lock)
 618{
 619        struct active_request_slot *slot;
 620        struct slot_results results;
 621        struct curl_slist *dav_headers;
 622        int rc = 0;
 623
 624        lock->refreshing = 1;
 625
 626        dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF | DAV_HEADER_TIMEOUT);
 627
 628        slot = get_active_slot();
 629        slot->results = &results;
 630        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 631        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 632        curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
 633        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
 634        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 635
 636        if (start_active_slot(slot)) {
 637                run_active_slot(slot);
 638                if (results.curl_result != CURLE_OK) {
 639                        fprintf(stderr, "LOCK HTTP error %ld\n",
 640                                results.http_code);
 641                } else {
 642                        lock->start_time = time(NULL);
 643                        rc = 1;
 644                }
 645        }
 646
 647        lock->refreshing = 0;
 648        curl_slist_free_all(dav_headers);
 649
 650        return rc;
 651}
 652
 653static void check_locks(void)
 654{
 655        struct remote_lock *lock = repo->locks;
 656        time_t current_time = time(NULL);
 657        int time_remaining;
 658
 659        while (lock) {
 660                time_remaining = lock->start_time + lock->timeout -
 661                        current_time;
 662                if (!lock->refreshing && time_remaining < LOCK_REFRESH) {
 663                        if (!refresh_lock(lock)) {
 664                                fprintf(stderr,
 665                                        "Unable to refresh lock for %s\n",
 666                                        lock->url);
 667                                aborted = 1;
 668                                return;
 669                        }
 670                }
 671                lock = lock->next;
 672        }
 673}
 674
 675static void release_request(struct transfer_request *request)
 676{
 677        struct transfer_request *entry = request_queue_head;
 678
 679        if (request == request_queue_head) {
 680                request_queue_head = request->next;
 681        } else {
 682                while (entry->next != NULL && entry->next != request)
 683                        entry = entry->next;
 684                if (entry->next == request)
 685                        entry->next = entry->next->next;
 686        }
 687
 688        if (request->local_fileno != -1)
 689                close(request->local_fileno);
 690        if (request->local_stream)
 691                fclose(request->local_stream);
 692        free(request->url);
 693        free(request);
 694}
 695
 696static void finish_request(struct transfer_request *request)
 697{
 698        struct stat st;
 699        struct packed_git *target;
 700        struct packed_git **lst;
 701
 702        request->curl_result = request->slot->curl_result;
 703        request->http_code = request->slot->http_code;
 704        request->slot = NULL;
 705
 706        /* Keep locks active */
 707        check_locks();
 708
 709        if (request->headers != NULL)
 710                curl_slist_free_all(request->headers);
 711
 712        /* URL is reused for MOVE after PUT */
 713        if (request->state != RUN_PUT) {
 714                free(request->url);
 715                request->url = NULL;
 716        }
 717
 718        if (request->state == RUN_MKCOL) {
 719                if (request->curl_result == CURLE_OK ||
 720                    request->http_code == 405) {
 721                        remote_dir_exists[request->obj->sha1[0]] = 1;
 722                        start_put(request);
 723                } else {
 724                        fprintf(stderr, "MKCOL %s failed, aborting (%d/%ld)\n",
 725                                sha1_to_hex(request->obj->sha1),
 726                                request->curl_result, request->http_code);
 727                        request->state = ABORTED;
 728                        aborted = 1;
 729                }
 730        } else if (request->state == RUN_PUT) {
 731                if (request->curl_result == CURLE_OK) {
 732                        start_move(request);
 733                } else {
 734                        fprintf(stderr, "PUT %s failed, aborting (%d/%ld)\n",
 735                                sha1_to_hex(request->obj->sha1),
 736                                request->curl_result, request->http_code);
 737                        request->state = ABORTED;
 738                        aborted = 1;
 739                }
 740        } else if (request->state == RUN_MOVE) {
 741                if (request->curl_result == CURLE_OK) {
 742                        if (push_verbosely)
 743                                fprintf(stderr, "    sent %s\n",
 744                                        sha1_to_hex(request->obj->sha1));
 745                        request->obj->flags |= REMOTE;
 746                        release_request(request);
 747                } else {
 748                        fprintf(stderr, "MOVE %s failed, aborting (%d/%ld)\n",
 749                                sha1_to_hex(request->obj->sha1),
 750                                request->curl_result, request->http_code);
 751                        request->state = ABORTED;
 752                        aborted = 1;
 753                }
 754        } else if (request->state == RUN_FETCH_LOOSE) {
 755                close(request->local_fileno); request->local_fileno = -1;
 756
 757                if (request->curl_result != CURLE_OK &&
 758                    request->http_code != 416) {
 759                        if (stat(request->tmpfile, &st) == 0) {
 760                                if (st.st_size == 0)
 761                                        unlink(request->tmpfile);
 762                        }
 763                } else {
 764                        if (request->http_code == 416)
 765                                warning("requested range invalid; we may already have all the data.");
 766
 767                        git_inflate_end(&request->stream);
 768                        git_SHA1_Final(request->real_sha1, &request->c);
 769                        if (request->zret != Z_STREAM_END) {
 770                                unlink(request->tmpfile);
 771                        } else if (hashcmp(request->obj->sha1, request->real_sha1)) {
 772                                unlink(request->tmpfile);
 773                        } else {
 774                                request->rename =
 775                                        move_temp_to_file(
 776                                                request->tmpfile,
 777                                                request->filename);
 778                                if (request->rename == 0) {
 779                                        request->obj->flags |= (LOCAL | REMOTE);
 780                                }
 781                        }
 782                }
 783
 784                /* Try fetching packed if necessary */
 785                if (request->obj->flags & LOCAL)
 786                        release_request(request);
 787                else
 788                        start_fetch_packed(request);
 789
 790        } else if (request->state == RUN_FETCH_PACKED) {
 791                if (request->curl_result != CURLE_OK) {
 792                        fprintf(stderr, "Unable to get pack file %s\n%s",
 793                                request->url, curl_errorstr);
 794                        repo->can_update_info_refs = 0;
 795                } else {
 796                        off_t pack_size = ftell(request->local_stream);
 797
 798                        fclose(request->local_stream);
 799                        request->local_stream = NULL;
 800                        if (!move_temp_to_file(request->tmpfile,
 801                                               request->filename)) {
 802                                target = (struct packed_git *)request->userData;
 803                                target->pack_size = pack_size;
 804                                lst = &repo->packs;
 805                                while (*lst != target)
 806                                        lst = &((*lst)->next);
 807                                *lst = (*lst)->next;
 808
 809                                if (!verify_pack(target))
 810                                        install_packed_git(target);
 811                                else
 812                                        repo->can_update_info_refs = 0;
 813                        }
 814                }
 815                release_request(request);
 816        }
 817}
 818
 819#ifdef USE_CURL_MULTI
 820static int fill_active_slot(void *unused)
 821{
 822        struct transfer_request *request;
 823
 824        if (aborted)
 825                return 0;
 826
 827        for (request = request_queue_head; request; request = request->next) {
 828                if (request->state == NEED_FETCH) {
 829                        start_fetch_loose(request);
 830                        return 1;
 831                } else if (pushing && request->state == NEED_PUSH) {
 832                        if (remote_dir_exists[request->obj->sha1[0]] == 1) {
 833                                start_put(request);
 834                        } else {
 835                                start_mkcol(request);
 836                        }
 837                        return 1;
 838                }
 839        }
 840        return 0;
 841}
 842#endif
 843
 844static void get_remote_object_list(unsigned char parent);
 845
 846static void add_fetch_request(struct object *obj)
 847{
 848        struct transfer_request *request;
 849
 850        check_locks();
 851
 852        /*
 853         * Don't fetch the object if it's known to exist locally
 854         * or is already in the request queue
 855         */
 856        if (remote_dir_exists[obj->sha1[0]] == -1)
 857                get_remote_object_list(obj->sha1[0]);
 858        if (obj->flags & (LOCAL | FETCHING))
 859                return;
 860
 861        obj->flags |= FETCHING;
 862        request = xmalloc(sizeof(*request));
 863        request->obj = obj;
 864        request->url = NULL;
 865        request->lock = NULL;
 866        request->headers = NULL;
 867        request->local_fileno = -1;
 868        request->local_stream = NULL;
 869        request->state = NEED_FETCH;
 870        request->next = request_queue_head;
 871        request_queue_head = request;
 872
 873#ifdef USE_CURL_MULTI
 874        fill_active_slots();
 875        step_active_slots();
 876#endif
 877}
 878
 879static int add_send_request(struct object *obj, struct remote_lock *lock)
 880{
 881        struct transfer_request *request = request_queue_head;
 882        struct packed_git *target;
 883
 884        /* Keep locks active */
 885        check_locks();
 886
 887        /*
 888         * Don't push the object if it's known to exist on the remote
 889         * or is already in the request queue
 890         */
 891        if (remote_dir_exists[obj->sha1[0]] == -1)
 892                get_remote_object_list(obj->sha1[0]);
 893        if (obj->flags & (REMOTE | PUSHING))
 894                return 0;
 895        target = find_sha1_pack(obj->sha1, repo->packs);
 896        if (target) {
 897                obj->flags |= REMOTE;
 898                return 0;
 899        }
 900
 901        obj->flags |= PUSHING;
 902        request = xmalloc(sizeof(*request));
 903        request->obj = obj;
 904        request->url = NULL;
 905        request->lock = lock;
 906        request->headers = NULL;
 907        request->local_fileno = -1;
 908        request->local_stream = NULL;
 909        request->state = NEED_PUSH;
 910        request->next = request_queue_head;
 911        request_queue_head = request;
 912
 913#ifdef USE_CURL_MULTI
 914        fill_active_slots();
 915        step_active_slots();
 916#endif
 917
 918        return 1;
 919}
 920
 921static int fetch_index(unsigned char *sha1)
 922{
 923        char *hex = sha1_to_hex(sha1);
 924        char *filename;
 925        char *url;
 926        char tmpfile[PATH_MAX];
 927        long prev_posn = 0;
 928        char range[RANGE_HEADER_SIZE];
 929        struct curl_slist *range_header = NULL;
 930
 931        FILE *indexfile;
 932        struct active_request_slot *slot;
 933        struct slot_results results;
 934
 935        /* Don't use the index if the pack isn't there */
 936        url = xmalloc(strlen(repo->url) + 64);
 937        sprintf(url, "%sobjects/pack/pack-%s.pack", repo->url, hex);
 938        slot = get_active_slot();
 939        slot->results = &results;
 940        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 941        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
 942        if (start_active_slot(slot)) {
 943                run_active_slot(slot);
 944                if (results.curl_result != CURLE_OK) {
 945                        free(url);
 946                        return error("Unable to verify pack %s is available",
 947                                     hex);
 948                }
 949        } else {
 950                free(url);
 951                return error("Unable to start request");
 952        }
 953
 954        if (has_pack_index(sha1)) {
 955                free(url);
 956                return 0;
 957        }
 958
 959        if (push_verbosely)
 960                fprintf(stderr, "Getting index for pack %s\n", hex);
 961
 962        sprintf(url, "%sobjects/pack/pack-%s.idx", repo->url, hex);
 963
 964        filename = sha1_pack_index_name(sha1);
 965        snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename);
 966        indexfile = fopen(tmpfile, "a");
 967        if (!indexfile) {
 968                free(url);
 969                return error("Unable to open local file %s for pack index",
 970                             tmpfile);
 971        }
 972
 973        slot = get_active_slot();
 974        slot->results = &results;
 975        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 976        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 977        curl_easy_setopt(slot->curl, CURLOPT_FILE, indexfile);
 978        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
 979        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 980        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
 981        slot->local = indexfile;
 982
 983        /* If there is data present from a previous transfer attempt,
 984           resume where it left off */
 985        prev_posn = ftell(indexfile);
 986        if (prev_posn>0) {
 987                if (push_verbosely)
 988                        fprintf(stderr,
 989                                "Resuming fetch of index for pack %s at byte %ld\n",
 990                                hex, prev_posn);
 991                sprintf(range, "Range: bytes=%ld-", prev_posn);
 992                range_header = curl_slist_append(range_header, range);
 993                curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
 994        }
 995
 996        if (start_active_slot(slot)) {
 997                run_active_slot(slot);
 998                if (results.curl_result != CURLE_OK) {
 999                        free(url);
1000                        fclose(indexfile);
1001                        return error("Unable to get pack index %s\n%s", url,
1002                                     curl_errorstr);
1003                }
1004        } else {
1005                free(url);
1006                fclose(indexfile);
1007                return error("Unable to start request");
1008        }
1009
1010        free(url);
1011        fclose(indexfile);
1012
1013        return move_temp_to_file(tmpfile, filename);
1014}
1015
1016static int setup_index(unsigned char *sha1)
1017{
1018        struct packed_git *new_pack;
1019
1020        if (fetch_index(sha1))
1021                return -1;
1022
1023        new_pack = parse_pack_index(sha1);
1024        new_pack->next = repo->packs;
1025        repo->packs = new_pack;
1026        return 0;
1027}
1028
1029static int fetch_indices(void)
1030{
1031        unsigned char sha1[20];
1032        char *url;
1033        struct strbuf buffer = STRBUF_INIT;
1034        char *data;
1035        int i = 0;
1036
1037        struct active_request_slot *slot;
1038        struct slot_results results;
1039
1040        if (push_verbosely)
1041                fprintf(stderr, "Getting pack list\n");
1042
1043        url = xmalloc(strlen(repo->url) + 20);
1044        sprintf(url, "%sobjects/info/packs", repo->url);
1045
1046        slot = get_active_slot();
1047        slot->results = &results;
1048        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
1049        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1050        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1051        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
1052        if (start_active_slot(slot)) {
1053                run_active_slot(slot);
1054                if (results.curl_result != CURLE_OK) {
1055                        strbuf_release(&buffer);
1056                        free(url);
1057                        if (results.http_code == 404)
1058                                return 0;
1059                        else
1060                                return error("%s", curl_errorstr);
1061                }
1062        } else {
1063                strbuf_release(&buffer);
1064                free(url);
1065                return error("Unable to start request");
1066        }
1067        free(url);
1068
1069        data = buffer.buf;
1070        while (i < buffer.len) {
1071                switch (data[i]) {
1072                case 'P':
1073                        i++;
1074                        if (i + 52 < buffer.len &&
1075                            !prefixcmp(data + i, " pack-") &&
1076                            !prefixcmp(data + i + 46, ".pack\n")) {
1077                                get_sha1_hex(data + i + 6, sha1);
1078                                setup_index(sha1);
1079                                i += 51;
1080                                break;
1081                        }
1082                default:
1083                        while (data[i] != '\n')
1084                                i++;
1085                }
1086                i++;
1087        }
1088
1089        strbuf_release(&buffer);
1090        return 0;
1091}
1092
1093static void one_remote_object(const char *hex)
1094{
1095        unsigned char sha1[20];
1096        struct object *obj;
1097
1098        if (get_sha1_hex(hex, sha1) != 0)
1099                return;
1100
1101        obj = lookup_object(sha1);
1102        if (!obj)
1103                obj = parse_object(sha1);
1104
1105        /* Ignore remote objects that don't exist locally */
1106        if (!obj)
1107                return;
1108
1109        obj->flags |= REMOTE;
1110        if (!object_list_contains(objects, obj))
1111                object_list_insert(obj, &objects);
1112}
1113
1114static void handle_lockprop_ctx(struct xml_ctx *ctx, int tag_closed)
1115{
1116        int *lock_flags = (int *)ctx->userData;
1117
1118        if (tag_closed) {
1119                if (!strcmp(ctx->name, DAV_CTX_LOCKENTRY)) {
1120                        if ((*lock_flags & DAV_PROP_LOCKEX) &&
1121                            (*lock_flags & DAV_PROP_LOCKWR)) {
1122                                *lock_flags |= DAV_LOCK_OK;
1123                        }
1124                        *lock_flags &= DAV_LOCK_OK;
1125                } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_WRITE)) {
1126                        *lock_flags |= DAV_PROP_LOCKWR;
1127                } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_EXCLUSIVE)) {
1128                        *lock_flags |= DAV_PROP_LOCKEX;
1129                }
1130        }
1131}
1132
1133static void handle_new_lock_ctx(struct xml_ctx *ctx, int tag_closed)
1134{
1135        struct remote_lock *lock = (struct remote_lock *)ctx->userData;
1136        git_SHA_CTX sha_ctx;
1137        unsigned char lock_token_sha1[20];
1138
1139        if (tag_closed && ctx->cdata) {
1140                if (!strcmp(ctx->name, DAV_ACTIVELOCK_OWNER)) {
1141                        lock->owner = xmalloc(strlen(ctx->cdata) + 1);
1142                        strcpy(lock->owner, ctx->cdata);
1143                } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TIMEOUT)) {
1144                        if (!prefixcmp(ctx->cdata, "Second-"))
1145                                lock->timeout =
1146                                        strtol(ctx->cdata + 7, NULL, 10);
1147                } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TOKEN)) {
1148                        lock->token = xmalloc(strlen(ctx->cdata) + 1);
1149                        strcpy(lock->token, ctx->cdata);
1150
1151                        git_SHA1_Init(&sha_ctx);
1152                        git_SHA1_Update(&sha_ctx, lock->token, strlen(lock->token));
1153                        git_SHA1_Final(lock_token_sha1, &sha_ctx);
1154
1155                        lock->tmpfile_suffix[0] = '_';
1156                        memcpy(lock->tmpfile_suffix + 1, sha1_to_hex(lock_token_sha1), 40);
1157                }
1158        }
1159}
1160
1161static void one_remote_ref(char *refname);
1162
1163static void
1164xml_start_tag(void *userData, const char *name, const char **atts)
1165{
1166        struct xml_ctx *ctx = (struct xml_ctx *)userData;
1167        const char *c = strchr(name, ':');
1168        int new_len;
1169
1170        if (c == NULL)
1171                c = name;
1172        else
1173                c++;
1174
1175        new_len = strlen(ctx->name) + strlen(c) + 2;
1176
1177        if (new_len > ctx->len) {
1178                ctx->name = xrealloc(ctx->name, new_len);
1179                ctx->len = new_len;
1180        }
1181        strcat(ctx->name, ".");
1182        strcat(ctx->name, c);
1183
1184        free(ctx->cdata);
1185        ctx->cdata = NULL;
1186
1187        ctx->userFunc(ctx, 0);
1188}
1189
1190static void
1191xml_end_tag(void *userData, const char *name)
1192{
1193        struct xml_ctx *ctx = (struct xml_ctx *)userData;
1194        const char *c = strchr(name, ':');
1195        char *ep;
1196
1197        ctx->userFunc(ctx, 1);
1198
1199        if (c == NULL)
1200                c = name;
1201        else
1202                c++;
1203
1204        ep = ctx->name + strlen(ctx->name) - strlen(c) - 1;
1205        *ep = 0;
1206}
1207
1208static void
1209xml_cdata(void *userData, const XML_Char *s, int len)
1210{
1211        struct xml_ctx *ctx = (struct xml_ctx *)userData;
1212        free(ctx->cdata);
1213        ctx->cdata = xmemdupz(s, len);
1214}
1215
1216static struct remote_lock *lock_remote(const char *path, long timeout)
1217{
1218        struct active_request_slot *slot;
1219        struct slot_results results;
1220        struct buffer out_buffer = { STRBUF_INIT, 0 };
1221        struct strbuf in_buffer = STRBUF_INIT;
1222        char *url;
1223        char *ep;
1224        char timeout_header[25];
1225        struct remote_lock *lock = NULL;
1226        struct curl_slist *dav_headers = NULL;
1227        struct xml_ctx ctx;
1228
1229        url = xmalloc(strlen(repo->url) + strlen(path) + 1);
1230        sprintf(url, "%s%s", repo->url, path);
1231
1232        /* Make sure leading directories exist for the remote ref */
1233        ep = strchr(url + strlen(repo->url) + 1, '/');
1234        while (ep) {
1235                char saved_character = ep[1];
1236                ep[1] = '\0';
1237                slot = get_active_slot();
1238                slot->results = &results;
1239                curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1240                curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1241                curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
1242                curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1243                if (start_active_slot(slot)) {
1244                        run_active_slot(slot);
1245                        if (results.curl_result != CURLE_OK &&
1246                            results.http_code != 405) {
1247                                fprintf(stderr,
1248                                        "Unable to create branch path %s\n",
1249                                        url);
1250                                free(url);
1251                                return NULL;
1252                        }
1253                } else {
1254                        fprintf(stderr, "Unable to start MKCOL request\n");
1255                        free(url);
1256                        return NULL;
1257                }
1258                ep[1] = saved_character;
1259                ep = strchr(ep + 1, '/');
1260        }
1261
1262        strbuf_addf(&out_buffer.buf, LOCK_REQUEST, git_default_email);
1263
1264        sprintf(timeout_header, "Timeout: Second-%ld", timeout);
1265        dav_headers = curl_slist_append(dav_headers, timeout_header);
1266        dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1267
1268        slot = get_active_slot();
1269        slot->results = &results;
1270        curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1271        curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1272        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1273#ifndef NO_CURL_IOCTL
1274        curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
1275        curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &out_buffer);
1276#endif
1277        curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1278        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1279        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1280        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1281        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
1282        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1283
1284        lock = xcalloc(1, sizeof(*lock));
1285        lock->timeout = -1;
1286
1287        if (start_active_slot(slot)) {
1288                run_active_slot(slot);
1289                if (results.curl_result == CURLE_OK) {
1290                        XML_Parser parser = XML_ParserCreate(NULL);
1291                        enum XML_Status result;
1292                        ctx.name = xcalloc(10, 1);
1293                        ctx.len = 0;
1294                        ctx.cdata = NULL;
1295                        ctx.userFunc = handle_new_lock_ctx;
1296                        ctx.userData = lock;
1297                        XML_SetUserData(parser, &ctx);
1298                        XML_SetElementHandler(parser, xml_start_tag,
1299                                              xml_end_tag);
1300                        XML_SetCharacterDataHandler(parser, xml_cdata);
1301                        result = XML_Parse(parser, in_buffer.buf,
1302                                           in_buffer.len, 1);
1303                        free(ctx.name);
1304                        if (result != XML_STATUS_OK) {
1305                                fprintf(stderr, "XML error: %s\n",
1306                                        XML_ErrorString(
1307                                                XML_GetErrorCode(parser)));
1308                                lock->timeout = -1;
1309                        }
1310                        XML_ParserFree(parser);
1311                }
1312        } else {
1313                fprintf(stderr, "Unable to start LOCK request\n");
1314        }
1315
1316        curl_slist_free_all(dav_headers);
1317        strbuf_release(&out_buffer.buf);
1318        strbuf_release(&in_buffer);
1319
1320        if (lock->token == NULL || lock->timeout <= 0) {
1321                free(lock->token);
1322                free(lock->owner);
1323                free(url);
1324                free(lock);
1325                lock = NULL;
1326        } else {
1327                lock->url = url;
1328                lock->start_time = time(NULL);
1329                lock->next = repo->locks;
1330                repo->locks = lock;
1331        }
1332
1333        return lock;
1334}
1335
1336static int unlock_remote(struct remote_lock *lock)
1337{
1338        struct active_request_slot *slot;
1339        struct slot_results results;
1340        struct remote_lock *prev = repo->locks;
1341        struct curl_slist *dav_headers;
1342        int rc = 0;
1343
1344        dav_headers = get_dav_token_headers(lock, DAV_HEADER_LOCK);
1345
1346        slot = get_active_slot();
1347        slot->results = &results;
1348        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1349        curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1350        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_UNLOCK);
1351        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1352
1353        if (start_active_slot(slot)) {
1354                run_active_slot(slot);
1355                if (results.curl_result == CURLE_OK)
1356                        rc = 1;
1357                else
1358                        fprintf(stderr, "UNLOCK HTTP error %ld\n",
1359                                results.http_code);
1360        } else {
1361                fprintf(stderr, "Unable to start UNLOCK request\n");
1362        }
1363
1364        curl_slist_free_all(dav_headers);
1365
1366        if (repo->locks == lock) {
1367                repo->locks = lock->next;
1368        } else {
1369                while (prev && prev->next != lock)
1370                        prev = prev->next;
1371                if (prev)
1372                        prev->next = prev->next->next;
1373        }
1374
1375        free(lock->owner);
1376        free(lock->url);
1377        free(lock->token);
1378        free(lock);
1379
1380        return rc;
1381}
1382
1383static void remove_locks(void)
1384{
1385        struct remote_lock *lock = repo->locks;
1386
1387        fprintf(stderr, "Removing remote locks...\n");
1388        while (lock) {
1389                unlock_remote(lock);
1390                lock = lock->next;
1391        }
1392}
1393
1394static void remove_locks_on_signal(int signo)
1395{
1396        remove_locks();
1397        sigchain_pop(signo);
1398        raise(signo);
1399}
1400
1401static void remote_ls(const char *path, int flags,
1402                      void (*userFunc)(struct remote_ls_ctx *ls),
1403                      void *userData);
1404
1405static void process_ls_object(struct remote_ls_ctx *ls)
1406{
1407        unsigned int *parent = (unsigned int *)ls->userData;
1408        char *path = ls->dentry_name;
1409        char *obj_hex;
1410
1411        if (!strcmp(ls->path, ls->dentry_name) && (ls->flags & IS_DIR)) {
1412                remote_dir_exists[*parent] = 1;
1413                return;
1414        }
1415
1416        if (strlen(path) != 49)
1417                return;
1418        path += 8;
1419        obj_hex = xmalloc(strlen(path));
1420        /* NB: path is not null-terminated, can not use strlcpy here */
1421        memcpy(obj_hex, path, 2);
1422        strcpy(obj_hex + 2, path + 3);
1423        one_remote_object(obj_hex);
1424        free(obj_hex);
1425}
1426
1427static void process_ls_ref(struct remote_ls_ctx *ls)
1428{
1429        if (!strcmp(ls->path, ls->dentry_name) && (ls->dentry_flags & IS_DIR)) {
1430                fprintf(stderr, "  %s\n", ls->dentry_name);
1431                return;
1432        }
1433
1434        if (!(ls->dentry_flags & IS_DIR))
1435                one_remote_ref(ls->dentry_name);
1436}
1437
1438static void handle_remote_ls_ctx(struct xml_ctx *ctx, int tag_closed)
1439{
1440        struct remote_ls_ctx *ls = (struct remote_ls_ctx *)ctx->userData;
1441
1442        if (tag_closed) {
1443                if (!strcmp(ctx->name, DAV_PROPFIND_RESP) && ls->dentry_name) {
1444                        if (ls->dentry_flags & IS_DIR) {
1445                                if (ls->flags & PROCESS_DIRS) {
1446                                        ls->userFunc(ls);
1447                                }
1448                                if (strcmp(ls->dentry_name, ls->path) &&
1449                                    ls->flags & RECURSIVE) {
1450                                        remote_ls(ls->dentry_name,
1451                                                  ls->flags,
1452                                                  ls->userFunc,
1453                                                  ls->userData);
1454                                }
1455                        } else if (ls->flags & PROCESS_FILES) {
1456                                ls->userFunc(ls);
1457                        }
1458                } else if (!strcmp(ctx->name, DAV_PROPFIND_NAME) && ctx->cdata) {
1459                        char *path = ctx->cdata;
1460                        if (*ctx->cdata == 'h') {
1461                                path = strstr(path, "//");
1462                                if (path) {
1463                                        path = strchr(path+2, '/');
1464                                }
1465                        }
1466                        if (path) {
1467                                path += repo->path_len;
1468                                ls->dentry_name = xstrdup(path);
1469                        }
1470                } else if (!strcmp(ctx->name, DAV_PROPFIND_COLLECTION)) {
1471                        ls->dentry_flags |= IS_DIR;
1472                }
1473        } else if (!strcmp(ctx->name, DAV_PROPFIND_RESP)) {
1474                free(ls->dentry_name);
1475                ls->dentry_name = NULL;
1476                ls->dentry_flags = 0;
1477        }
1478}
1479
1480/*
1481 * NEEDSWORK: remote_ls() ignores info/refs on the remote side.  But it
1482 * should _only_ heed the information from that file, instead of trying to
1483 * determine the refs from the remote file system (badly: it does not even
1484 * know about packed-refs).
1485 */
1486static void remote_ls(const char *path, int flags,
1487                      void (*userFunc)(struct remote_ls_ctx *ls),
1488                      void *userData)
1489{
1490        char *url = xmalloc(strlen(repo->url) + strlen(path) + 1);
1491        struct active_request_slot *slot;
1492        struct slot_results results;
1493        struct strbuf in_buffer = STRBUF_INIT;
1494        struct buffer out_buffer = { STRBUF_INIT, 0 };
1495        struct curl_slist *dav_headers = NULL;
1496        struct xml_ctx ctx;
1497        struct remote_ls_ctx ls;
1498
1499        ls.flags = flags;
1500        ls.path = xstrdup(path);
1501        ls.dentry_name = NULL;
1502        ls.dentry_flags = 0;
1503        ls.userData = userData;
1504        ls.userFunc = userFunc;
1505
1506        sprintf(url, "%s%s", repo->url, path);
1507
1508        strbuf_addf(&out_buffer.buf, PROPFIND_ALL_REQUEST);
1509
1510        dav_headers = curl_slist_append(dav_headers, "Depth: 1");
1511        dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1512
1513        slot = get_active_slot();
1514        slot->results = &results;
1515        curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1516        curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1517        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1518#ifndef NO_CURL_IOCTL
1519        curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
1520        curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &out_buffer);
1521#endif
1522        curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1523        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1524        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1525        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1526        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1527        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1528
1529        if (start_active_slot(slot)) {
1530                run_active_slot(slot);
1531                if (results.curl_result == CURLE_OK) {
1532                        XML_Parser parser = XML_ParserCreate(NULL);
1533                        enum XML_Status result;
1534                        ctx.name = xcalloc(10, 1);
1535                        ctx.len = 0;
1536                        ctx.cdata = NULL;
1537                        ctx.userFunc = handle_remote_ls_ctx;
1538                        ctx.userData = &ls;
1539                        XML_SetUserData(parser, &ctx);
1540                        XML_SetElementHandler(parser, xml_start_tag,
1541                                              xml_end_tag);
1542                        XML_SetCharacterDataHandler(parser, xml_cdata);
1543                        result = XML_Parse(parser, in_buffer.buf,
1544                                           in_buffer.len, 1);
1545                        free(ctx.name);
1546
1547                        if (result != XML_STATUS_OK) {
1548                                fprintf(stderr, "XML error: %s\n",
1549                                        XML_ErrorString(
1550                                                XML_GetErrorCode(parser)));
1551                        }
1552                        XML_ParserFree(parser);
1553                }
1554        } else {
1555                fprintf(stderr, "Unable to start PROPFIND request\n");
1556        }
1557
1558        free(ls.path);
1559        free(url);
1560        strbuf_release(&out_buffer.buf);
1561        strbuf_release(&in_buffer);
1562        curl_slist_free_all(dav_headers);
1563}
1564
1565static void get_remote_object_list(unsigned char parent)
1566{
1567        char path[] = "objects/XX/";
1568        static const char hex[] = "0123456789abcdef";
1569        unsigned int val = parent;
1570
1571        path[8] = hex[val >> 4];
1572        path[9] = hex[val & 0xf];
1573        remote_dir_exists[val] = 0;
1574        remote_ls(path, (PROCESS_FILES | PROCESS_DIRS),
1575                  process_ls_object, &val);
1576}
1577
1578static int locking_available(void)
1579{
1580        struct active_request_slot *slot;
1581        struct slot_results results;
1582        struct strbuf in_buffer = STRBUF_INIT;
1583        struct buffer out_buffer = { STRBUF_INIT, 0 };
1584        struct curl_slist *dav_headers = NULL;
1585        struct xml_ctx ctx;
1586        int lock_flags = 0;
1587
1588        strbuf_addf(&out_buffer.buf, PROPFIND_SUPPORTEDLOCK_REQUEST, repo->url);
1589
1590        dav_headers = curl_slist_append(dav_headers, "Depth: 0");
1591        dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1592
1593        slot = get_active_slot();
1594        slot->results = &results;
1595        curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1596        curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1597        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1598#ifndef NO_CURL_IOCTL
1599        curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
1600        curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &out_buffer);
1601#endif
1602        curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1603        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1604        curl_easy_setopt(slot->curl, CURLOPT_URL, repo->url);
1605        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1606        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1607        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1608
1609        if (start_active_slot(slot)) {
1610                run_active_slot(slot);
1611                if (results.curl_result == CURLE_OK) {
1612                        XML_Parser parser = XML_ParserCreate(NULL);
1613                        enum XML_Status result;
1614                        ctx.name = xcalloc(10, 1);
1615                        ctx.len = 0;
1616                        ctx.cdata = NULL;
1617                        ctx.userFunc = handle_lockprop_ctx;
1618                        ctx.userData = &lock_flags;
1619                        XML_SetUserData(parser, &ctx);
1620                        XML_SetElementHandler(parser, xml_start_tag,
1621                                              xml_end_tag);
1622                        result = XML_Parse(parser, in_buffer.buf,
1623                                           in_buffer.len, 1);
1624                        free(ctx.name);
1625
1626                        if (result != XML_STATUS_OK) {
1627                                fprintf(stderr, "XML error: %s\n",
1628                                        XML_ErrorString(
1629                                                XML_GetErrorCode(parser)));
1630                                lock_flags = 0;
1631                        }
1632                        XML_ParserFree(parser);
1633                        if (!lock_flags)
1634                                error("no DAV locking support on %s",
1635                                      repo->url);
1636
1637                } else {
1638                        error("Cannot access URL %s, return code %d",
1639                              repo->url, results.curl_result);
1640                        lock_flags = 0;
1641                }
1642        } else {
1643                error("Unable to start PROPFIND request on %s", repo->url);
1644        }
1645
1646        strbuf_release(&out_buffer.buf);
1647        strbuf_release(&in_buffer);
1648        curl_slist_free_all(dav_headers);
1649
1650        return lock_flags;
1651}
1652
1653static struct object_list **add_one_object(struct object *obj, struct object_list **p)
1654{
1655        struct object_list *entry = xmalloc(sizeof(struct object_list));
1656        entry->item = obj;
1657        entry->next = *p;
1658        *p = entry;
1659        return &entry->next;
1660}
1661
1662static struct object_list **process_blob(struct blob *blob,
1663                                         struct object_list **p,
1664                                         struct name_path *path,
1665                                         const char *name)
1666{
1667        struct object *obj = &blob->object;
1668
1669        obj->flags |= LOCAL;
1670
1671        if (obj->flags & (UNINTERESTING | SEEN))
1672                return p;
1673
1674        obj->flags |= SEEN;
1675        return add_one_object(obj, p);
1676}
1677
1678static struct object_list **process_tree(struct tree *tree,
1679                                         struct object_list **p,
1680                                         struct name_path *path,
1681                                         const char *name)
1682{
1683        struct object *obj = &tree->object;
1684        struct tree_desc desc;
1685        struct name_entry entry;
1686        struct name_path me;
1687
1688        obj->flags |= LOCAL;
1689
1690        if (obj->flags & (UNINTERESTING | SEEN))
1691                return p;
1692        if (parse_tree(tree) < 0)
1693                die("bad tree object %s", sha1_to_hex(obj->sha1));
1694
1695        obj->flags |= SEEN;
1696        name = xstrdup(name);
1697        p = add_one_object(obj, p);
1698        me.up = path;
1699        me.elem = name;
1700        me.elem_len = strlen(name);
1701
1702        init_tree_desc(&desc, tree->buffer, tree->size);
1703
1704        while (tree_entry(&desc, &entry))
1705                switch (object_type(entry.mode)) {
1706                case OBJ_TREE:
1707                        p = process_tree(lookup_tree(entry.sha1), p, &me, name);
1708                        break;
1709                case OBJ_BLOB:
1710                        p = process_blob(lookup_blob(entry.sha1), p, &me, name);
1711                        break;
1712                default:
1713                        /* Subproject commit - not in this repository */
1714                        break;
1715                }
1716
1717        free(tree->buffer);
1718        tree->buffer = NULL;
1719        return p;
1720}
1721
1722static int get_delta(struct rev_info *revs, struct remote_lock *lock)
1723{
1724        int i;
1725        struct commit *commit;
1726        struct object_list **p = &objects;
1727        int count = 0;
1728
1729        while ((commit = get_revision(revs)) != NULL) {
1730                p = process_tree(commit->tree, p, NULL, "");
1731                commit->object.flags |= LOCAL;
1732                if (!(commit->object.flags & UNINTERESTING))
1733                        count += add_send_request(&commit->object, lock);
1734        }
1735
1736        for (i = 0; i < revs->pending.nr; i++) {
1737                struct object_array_entry *entry = revs->pending.objects + i;
1738                struct object *obj = entry->item;
1739                const char *name = entry->name;
1740
1741                if (obj->flags & (UNINTERESTING | SEEN))
1742                        continue;
1743                if (obj->type == OBJ_TAG) {
1744                        obj->flags |= SEEN;
1745                        p = add_one_object(obj, p);
1746                        continue;
1747                }
1748                if (obj->type == OBJ_TREE) {
1749                        p = process_tree((struct tree *)obj, p, NULL, name);
1750                        continue;
1751                }
1752                if (obj->type == OBJ_BLOB) {
1753                        p = process_blob((struct blob *)obj, p, NULL, name);
1754                        continue;
1755                }
1756                die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
1757        }
1758
1759        while (objects) {
1760                if (!(objects->item->flags & UNINTERESTING))
1761                        count += add_send_request(objects->item, lock);
1762                objects = objects->next;
1763        }
1764
1765        return count;
1766}
1767
1768static int update_remote(unsigned char *sha1, struct remote_lock *lock)
1769{
1770        struct active_request_slot *slot;
1771        struct slot_results results;
1772        struct buffer out_buffer = { STRBUF_INIT, 0 };
1773        struct curl_slist *dav_headers;
1774
1775        dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF);
1776
1777        strbuf_addf(&out_buffer.buf, "%s\n", sha1_to_hex(sha1));
1778
1779        slot = get_active_slot();
1780        slot->results = &results;
1781        curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1782        curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1783        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1784#ifndef NO_CURL_IOCTL
1785        curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
1786        curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &out_buffer);
1787#endif
1788        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1789        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
1790        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1791        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1792        curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
1793        curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1794
1795        if (start_active_slot(slot)) {
1796                run_active_slot(slot);
1797                strbuf_release(&out_buffer.buf);
1798                if (results.curl_result != CURLE_OK) {
1799                        fprintf(stderr,
1800                                "PUT error: curl result=%d, HTTP code=%ld\n",
1801                                results.curl_result, results.http_code);
1802                        /* We should attempt recovery? */
1803                        return 0;
1804                }
1805        } else {
1806                strbuf_release(&out_buffer.buf);
1807                fprintf(stderr, "Unable to start PUT request\n");
1808                return 0;
1809        }
1810
1811        return 1;
1812}
1813
1814static struct ref *remote_refs, **remote_tail;
1815
1816static void one_remote_ref(char *refname)
1817{
1818        struct ref *ref;
1819        struct object *obj;
1820
1821        ref = alloc_ref(refname);
1822
1823        if (http_fetch_ref(repo->url, ref) != 0) {
1824                fprintf(stderr,
1825                        "Unable to fetch ref %s from %s\n",
1826                        refname, repo->url);
1827                free(ref);
1828                return;
1829        }
1830
1831        /*
1832         * Fetch a copy of the object if it doesn't exist locally - it
1833         * may be required for updating server info later.
1834         */
1835        if (repo->can_update_info_refs && !has_sha1_file(ref->old_sha1)) {
1836                obj = lookup_unknown_object(ref->old_sha1);
1837                if (obj) {
1838                        fprintf(stderr, "  fetch %s for %s\n",
1839                                sha1_to_hex(ref->old_sha1), refname);
1840                        add_fetch_request(obj);
1841                }
1842        }
1843
1844        *remote_tail = ref;
1845        remote_tail = &ref->next;
1846}
1847
1848static void get_dav_remote_heads(void)
1849{
1850        remote_tail = &remote_refs;
1851        remote_ls("refs/", (PROCESS_FILES | PROCESS_DIRS | RECURSIVE), process_ls_ref, NULL);
1852}
1853
1854static int is_zero_sha1(const unsigned char *sha1)
1855{
1856        int i;
1857
1858        for (i = 0; i < 20; i++) {
1859                if (*sha1++)
1860                        return 0;
1861        }
1862        return 1;
1863}
1864
1865static void add_remote_info_ref(struct remote_ls_ctx *ls)
1866{
1867        struct strbuf *buf = (struct strbuf *)ls->userData;
1868        struct object *o;
1869        int len;
1870        char *ref_info;
1871        struct ref *ref;
1872
1873        ref = alloc_ref(ls->dentry_name);
1874
1875        if (http_fetch_ref(repo->url, ref) != 0) {
1876                fprintf(stderr,
1877                        "Unable to fetch ref %s from %s\n",
1878                        ls->dentry_name, repo->url);
1879                aborted = 1;
1880                free(ref);
1881                return;
1882        }
1883
1884        o = parse_object(ref->old_sha1);
1885        if (!o) {
1886                fprintf(stderr,
1887                        "Unable to parse object %s for remote ref %s\n",
1888                        sha1_to_hex(ref->old_sha1), ls->dentry_name);
1889                aborted = 1;
1890                free(ref);
1891                return;
1892        }
1893
1894        len = strlen(ls->dentry_name) + 42;
1895        ref_info = xcalloc(len + 1, 1);
1896        sprintf(ref_info, "%s   %s\n",
1897                sha1_to_hex(ref->old_sha1), ls->dentry_name);
1898        fwrite_buffer(ref_info, 1, len, buf);
1899        free(ref_info);
1900
1901        if (o->type == OBJ_TAG) {
1902                o = deref_tag(o, ls->dentry_name, 0);
1903                if (o) {
1904                        len = strlen(ls->dentry_name) + 45;
1905                        ref_info = xcalloc(len + 1, 1);
1906                        sprintf(ref_info, "%s   %s^{}\n",
1907                                sha1_to_hex(o->sha1), ls->dentry_name);
1908                        fwrite_buffer(ref_info, 1, len, buf);
1909                        free(ref_info);
1910                }
1911        }
1912        free(ref);
1913}
1914
1915static void update_remote_info_refs(struct remote_lock *lock)
1916{
1917        struct buffer buffer = { STRBUF_INIT, 0 };
1918        struct active_request_slot *slot;
1919        struct slot_results results;
1920        struct curl_slist *dav_headers;
1921
1922        remote_ls("refs/", (PROCESS_FILES | RECURSIVE),
1923                  add_remote_info_ref, &buffer.buf);
1924        if (!aborted) {
1925                dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF);
1926
1927                slot = get_active_slot();
1928                slot->results = &results;
1929                curl_easy_setopt(slot->curl, CURLOPT_INFILE, &buffer);
1930                curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, buffer.buf.len);
1931                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1932#ifndef NO_CURL_IOCTL
1933                curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
1934                curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &buffer);
1935#endif
1936                curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1937                curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
1938                curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1939                curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1940                curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
1941                curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1942
1943                if (start_active_slot(slot)) {
1944                        run_active_slot(slot);
1945                        if (results.curl_result != CURLE_OK) {
1946                                fprintf(stderr,
1947                                        "PUT error: curl result=%d, HTTP code=%ld\n",
1948                                        results.curl_result, results.http_code);
1949                        }
1950                }
1951        }
1952        strbuf_release(&buffer.buf);
1953}
1954
1955static int remote_exists(const char *path)
1956{
1957        char *url = xmalloc(strlen(repo->url) + strlen(path) + 1);
1958        struct active_request_slot *slot;
1959        struct slot_results results;
1960        int ret = -1;
1961
1962        sprintf(url, "%s%s", repo->url, path);
1963
1964        slot = get_active_slot();
1965        slot->results = &results;
1966        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1967        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1968
1969        if (start_active_slot(slot)) {
1970                run_active_slot(slot);
1971                if (results.http_code == 404)
1972                        ret = 0;
1973                else if (results.curl_result == CURLE_OK)
1974                        ret = 1;
1975                else
1976                        fprintf(stderr, "HEAD HTTP error %ld\n", results.http_code);
1977        } else {
1978                fprintf(stderr, "Unable to start HEAD request\n");
1979        }
1980
1981        free(url);
1982        return ret;
1983}
1984
1985static void fetch_symref(const char *path, char **symref, unsigned char *sha1)
1986{
1987        char *url;
1988        struct strbuf buffer = STRBUF_INIT;
1989        struct active_request_slot *slot;
1990        struct slot_results results;
1991
1992        url = xmalloc(strlen(repo->url) + strlen(path) + 1);
1993        sprintf(url, "%s%s", repo->url, path);
1994
1995        slot = get_active_slot();
1996        slot->results = &results;
1997        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
1998        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1999        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
2000        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2001        if (start_active_slot(slot)) {
2002                run_active_slot(slot);
2003                if (results.curl_result != CURLE_OK) {
2004                        die("Couldn't get %s for remote symref\n%s",
2005                            url, curl_errorstr);
2006                }
2007        } else {
2008                die("Unable to start remote symref request");
2009        }
2010        free(url);
2011
2012        free(*symref);
2013        *symref = NULL;
2014        hashclr(sha1);
2015
2016        if (buffer.len == 0)
2017                return;
2018
2019        /* If it's a symref, set the refname; otherwise try for a sha1 */
2020        if (!prefixcmp((char *)buffer.buf, "ref: ")) {
2021                *symref = xmemdupz((char *)buffer.buf + 5, buffer.len - 6);
2022        } else {
2023                get_sha1_hex(buffer.buf, sha1);
2024        }
2025
2026        strbuf_release(&buffer);
2027}
2028
2029static int verify_merge_base(unsigned char *head_sha1, unsigned char *branch_sha1)
2030{
2031        struct commit *head = lookup_commit(head_sha1);
2032        struct commit *branch = lookup_commit(branch_sha1);
2033        struct commit_list *merge_bases = get_merge_bases(head, branch, 1);
2034
2035        return (merge_bases && !merge_bases->next && merge_bases->item == branch);
2036}
2037
2038static int delete_remote_branch(char *pattern, int force)
2039{
2040        struct ref *refs = remote_refs;
2041        struct ref *remote_ref = NULL;
2042        unsigned char head_sha1[20];
2043        char *symref = NULL;
2044        int match;
2045        int patlen = strlen(pattern);
2046        int i;
2047        struct active_request_slot *slot;
2048        struct slot_results results;
2049        char *url;
2050
2051        /* Find the remote branch(es) matching the specified branch name */
2052        for (match = 0; refs; refs = refs->next) {
2053                char *name = refs->name;
2054                int namelen = strlen(name);
2055                if (namelen < patlen ||
2056                    memcmp(name + namelen - patlen, pattern, patlen))
2057                        continue;
2058                if (namelen != patlen && name[namelen - patlen - 1] != '/')
2059                        continue;
2060                match++;
2061                remote_ref = refs;
2062        }
2063        if (match == 0)
2064                return error("No remote branch matches %s", pattern);
2065        if (match != 1)
2066                return error("More than one remote branch matches %s",
2067                             pattern);
2068
2069        /*
2070         * Remote HEAD must be a symref (not exactly foolproof; a remote
2071         * symlink to a symref will look like a symref)
2072         */
2073        fetch_symref("HEAD", &symref, head_sha1);
2074        if (!symref)
2075                return error("Remote HEAD is not a symref");
2076
2077        /* Remote branch must not be the remote HEAD */
2078        for (i=0; symref && i<MAXDEPTH; i++) {
2079                if (!strcmp(remote_ref->name, symref))
2080                        return error("Remote branch %s is the current HEAD",
2081                                     remote_ref->name);
2082                fetch_symref(symref, &symref, head_sha1);
2083        }
2084
2085        /* Run extra sanity checks if delete is not forced */
2086        if (!force) {
2087                /* Remote HEAD must resolve to a known object */
2088                if (symref)
2089                        return error("Remote HEAD symrefs too deep");
2090                if (is_zero_sha1(head_sha1))
2091                        return error("Unable to resolve remote HEAD");
2092                if (!has_sha1_file(head_sha1))
2093                        return error("Remote HEAD resolves to object %s\nwhich does not exist locally, perhaps you need to fetch?", sha1_to_hex(head_sha1));
2094
2095                /* Remote branch must resolve to a known object */
2096                if (is_zero_sha1(remote_ref->old_sha1))
2097                        return error("Unable to resolve remote branch %s",
2098                                     remote_ref->name);
2099                if (!has_sha1_file(remote_ref->old_sha1))
2100                        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));
2101
2102                /* Remote branch must be an ancestor of remote HEAD */
2103                if (!verify_merge_base(head_sha1, remote_ref->old_sha1)) {
2104                        return error("The branch '%s' is not an ancestor "
2105                                     "of your current HEAD.\n"
2106                                     "If you are sure you want to delete it,"
2107                                     " run:\n\t'git http-push -D %s %s'",
2108                                     remote_ref->name, repo->url, pattern);
2109                }
2110        }
2111
2112        /* Send delete request */
2113        fprintf(stderr, "Removing remote branch '%s'\n", remote_ref->name);
2114        if (dry_run)
2115                return 0;
2116        url = xmalloc(strlen(repo->url) + strlen(remote_ref->name) + 1);
2117        sprintf(url, "%s%s", repo->url, remote_ref->name);
2118        slot = get_active_slot();
2119        slot->results = &results;
2120        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
2121        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
2122        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2123        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_DELETE);
2124        if (start_active_slot(slot)) {
2125                run_active_slot(slot);
2126                free(url);
2127                if (results.curl_result != CURLE_OK)
2128                        return error("DELETE request failed (%d/%ld)\n",
2129                                     results.curl_result, results.http_code);
2130        } else {
2131                free(url);
2132                return error("Unable to start DELETE request");
2133        }
2134
2135        return 0;
2136}
2137
2138int main(int argc, char **argv)
2139{
2140        struct transfer_request *request;
2141        struct transfer_request *next_request;
2142        int nr_refspec = 0;
2143        char **refspec = NULL;
2144        struct remote_lock *ref_lock = NULL;
2145        struct remote_lock *info_ref_lock = NULL;
2146        struct rev_info revs;
2147        int delete_branch = 0;
2148        int force_delete = 0;
2149        int objects_to_send;
2150        int rc = 0;
2151        int i;
2152        int new_refs;
2153        struct ref *ref, *local_refs;
2154        struct remote *remote;
2155        char *rewritten_url = NULL;
2156
2157        git_extract_argv0_path(argv[0]);
2158
2159        setup_git_directory();
2160
2161        repo = xcalloc(sizeof(*repo), 1);
2162
2163        argv++;
2164        for (i = 1; i < argc; i++, argv++) {
2165                char *arg = *argv;
2166
2167                if (*arg == '-') {
2168                        if (!strcmp(arg, "--all")) {
2169                                push_all = MATCH_REFS_ALL;
2170                                continue;
2171                        }
2172                        if (!strcmp(arg, "--force")) {
2173                                force_all = 1;
2174                                continue;
2175                        }
2176                        if (!strcmp(arg, "--dry-run")) {
2177                                dry_run = 1;
2178                                continue;
2179                        }
2180                        if (!strcmp(arg, "--verbose")) {
2181                                push_verbosely = 1;
2182                                continue;
2183                        }
2184                        if (!strcmp(arg, "-d")) {
2185                                delete_branch = 1;
2186                                continue;
2187                        }
2188                        if (!strcmp(arg, "-D")) {
2189                                delete_branch = 1;
2190                                force_delete = 1;
2191                                continue;
2192                        }
2193                }
2194                if (!repo->url) {
2195                        char *path = strstr(arg, "//");
2196                        repo->url = arg;
2197                        repo->path_len = strlen(arg);
2198                        if (path) {
2199                                repo->path = strchr(path+2, '/');
2200                                if (repo->path)
2201                                        repo->path_len = strlen(repo->path);
2202                        }
2203                        continue;
2204                }
2205                refspec = argv;
2206                nr_refspec = argc - i;
2207                break;
2208        }
2209
2210#ifndef USE_CURL_MULTI
2211        die("git-push is not available for http/https repository when not compiled with USE_CURL_MULTI");
2212#endif
2213
2214        if (!repo->url)
2215                usage(http_push_usage);
2216
2217        if (delete_branch && nr_refspec != 1)
2218                die("You must specify only one branch name when deleting a remote branch");
2219
2220        memset(remote_dir_exists, -1, 256);
2221
2222        /*
2223         * Create a minimum remote by hand to give to http_init(),
2224         * primarily to allow it to look at the URL.
2225         */
2226        remote = xcalloc(sizeof(*remote), 1);
2227        ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
2228        remote->url[remote->url_nr++] = repo->url;
2229        http_init(remote);
2230
2231        no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
2232
2233        if (repo->url && repo->url[strlen(repo->url)-1] != '/') {
2234                rewritten_url = xmalloc(strlen(repo->url)+2);
2235                strcpy(rewritten_url, repo->url);
2236                strcat(rewritten_url, "/");
2237                repo->path = rewritten_url + (repo->path - repo->url);
2238                repo->path_len++;
2239                repo->url = rewritten_url;
2240        }
2241
2242        /* Verify DAV compliance/lock support */
2243        if (!locking_available()) {
2244                rc = 1;
2245                goto cleanup;
2246        }
2247
2248        sigchain_push_common(remove_locks_on_signal);
2249
2250        /* Check whether the remote has server info files */
2251        repo->can_update_info_refs = 0;
2252        repo->has_info_refs = remote_exists("info/refs");
2253        repo->has_info_packs = remote_exists("objects/info/packs");
2254        if (repo->has_info_refs) {
2255                info_ref_lock = lock_remote("info/refs", LOCK_TIME);
2256                if (info_ref_lock)
2257                        repo->can_update_info_refs = 1;
2258                else {
2259                        error("cannot lock existing info/refs");
2260                        rc = 1;
2261                        goto cleanup;
2262                }
2263        }
2264        if (repo->has_info_packs)
2265                fetch_indices();
2266
2267        /* Get a list of all local and remote heads to validate refspecs */
2268        local_refs = get_local_heads();
2269        fprintf(stderr, "Fetching remote heads...\n");
2270        get_dav_remote_heads();
2271
2272        /* Remove a remote branch if -d or -D was specified */
2273        if (delete_branch) {
2274                if (delete_remote_branch(refspec[0], force_delete) == -1)
2275                        fprintf(stderr, "Unable to delete remote branch %s\n",
2276                                refspec[0]);
2277                goto cleanup;
2278        }
2279
2280        /* match them up */
2281        if (!remote_tail)
2282                remote_tail = &remote_refs;
2283        if (match_refs(local_refs, remote_refs, &remote_tail,
2284                       nr_refspec, (const char **) refspec, push_all)) {
2285                rc = -1;
2286                goto cleanup;
2287        }
2288        if (!remote_refs) {
2289                fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
2290                rc = 0;
2291                goto cleanup;
2292        }
2293
2294        new_refs = 0;
2295        for (ref = remote_refs; ref; ref = ref->next) {
2296                char old_hex[60], *new_hex;
2297                const char *commit_argv[4];
2298                int commit_argc;
2299                char *new_sha1_hex, *old_sha1_hex;
2300
2301                if (!ref->peer_ref)
2302                        continue;
2303
2304                if (is_zero_sha1(ref->peer_ref->new_sha1)) {
2305                        if (delete_remote_branch(ref->name, 1) == -1) {
2306                                error("Could not remove %s", ref->name);
2307                                rc = -4;
2308                        }
2309                        new_refs++;
2310                        continue;
2311                }
2312
2313                if (!hashcmp(ref->old_sha1, ref->peer_ref->new_sha1)) {
2314                        if (push_verbosely || 1)
2315                                fprintf(stderr, "'%s': up-to-date\n", ref->name);
2316                        continue;
2317                }
2318
2319                if (!force_all &&
2320                    !is_zero_sha1(ref->old_sha1) &&
2321                    !ref->force) {
2322                        if (!has_sha1_file(ref->old_sha1) ||
2323                            !ref_newer(ref->peer_ref->new_sha1,
2324                                       ref->old_sha1)) {
2325                                /*
2326                                 * We do not have the remote ref, or
2327                                 * we know that the remote ref is not
2328                                 * an ancestor of what we are trying to
2329                                 * push.  Either way this can be losing
2330                                 * commits at the remote end and likely
2331                                 * we were not up to date to begin with.
2332                                 */
2333                                error("remote '%s' is not an ancestor of\n"
2334                                      "local '%s'.\n"
2335                                      "Maybe you are not up-to-date and "
2336                                      "need to pull first?",
2337                                      ref->name,
2338                                      ref->peer_ref->name);
2339                                rc = -2;
2340                                continue;
2341                        }
2342                }
2343                hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
2344                new_refs++;
2345                strcpy(old_hex, sha1_to_hex(ref->old_sha1));
2346                new_hex = sha1_to_hex(ref->new_sha1);
2347
2348                fprintf(stderr, "updating '%s'", ref->name);
2349                if (strcmp(ref->name, ref->peer_ref->name))
2350                        fprintf(stderr, " using '%s'", ref->peer_ref->name);
2351                fprintf(stderr, "\n  from %s\n  to   %s\n", old_hex, new_hex);
2352                if (dry_run)
2353                        continue;
2354
2355                /* Lock remote branch ref */
2356                ref_lock = lock_remote(ref->name, LOCK_TIME);
2357                if (ref_lock == NULL) {
2358                        fprintf(stderr, "Unable to lock remote branch %s\n",
2359                                ref->name);
2360                        rc = 1;
2361                        continue;
2362                }
2363
2364                /* Set up revision info for this refspec */
2365                commit_argc = 3;
2366                new_sha1_hex = xstrdup(sha1_to_hex(ref->new_sha1));
2367                old_sha1_hex = NULL;
2368                commit_argv[1] = "--objects";
2369                commit_argv[2] = new_sha1_hex;
2370                if (!push_all && !is_zero_sha1(ref->old_sha1)) {
2371                        old_sha1_hex = xmalloc(42);
2372                        sprintf(old_sha1_hex, "^%s",
2373                                sha1_to_hex(ref->old_sha1));
2374                        commit_argv[3] = old_sha1_hex;
2375                        commit_argc++;
2376                }
2377                init_revisions(&revs, setup_git_directory());
2378                setup_revisions(commit_argc, commit_argv, &revs, NULL);
2379                revs.edge_hint = 0; /* just in case */
2380                free(new_sha1_hex);
2381                if (old_sha1_hex) {
2382                        free(old_sha1_hex);
2383                        commit_argv[1] = NULL;
2384                }
2385
2386                /* Generate a list of objects that need to be pushed */
2387                pushing = 0;
2388                if (prepare_revision_walk(&revs))
2389                        die("revision walk setup failed");
2390                mark_edges_uninteresting(revs.commits, &revs, NULL);
2391                objects_to_send = get_delta(&revs, ref_lock);
2392                finish_all_active_slots();
2393
2394                /* Push missing objects to remote, this would be a
2395                   convenient time to pack them first if appropriate. */
2396                pushing = 1;
2397                if (objects_to_send)
2398                        fprintf(stderr, "    sending %d objects\n",
2399                                objects_to_send);
2400#ifdef USE_CURL_MULTI
2401                fill_active_slots();
2402                add_fill_function(NULL, fill_active_slot);
2403#endif
2404                do {
2405                        finish_all_active_slots();
2406#ifdef USE_CURL_MULTI
2407                        fill_active_slots();
2408#endif
2409                } while (request_queue_head && !aborted);
2410
2411                /* Update the remote branch if all went well */
2412                if (aborted || !update_remote(ref->new_sha1, ref_lock))
2413                        rc = 1;
2414
2415                if (!rc)
2416                        fprintf(stderr, "    done\n");
2417                unlock_remote(ref_lock);
2418                check_locks();
2419        }
2420
2421        /* Update remote server info if appropriate */
2422        if (repo->has_info_refs && new_refs) {
2423                if (info_ref_lock && repo->can_update_info_refs) {
2424                        fprintf(stderr, "Updating remote server info\n");
2425                        if (!dry_run)
2426                                update_remote_info_refs(info_ref_lock);
2427                } else {
2428                        fprintf(stderr, "Unable to update server info\n");
2429                }
2430        }
2431
2432 cleanup:
2433        free(rewritten_url);
2434        if (info_ref_lock)
2435                unlock_remote(info_ref_lock);
2436        free(repo);
2437
2438        curl_slist_free_all(no_pragma_header);
2439
2440        http_cleanup();
2441
2442        request = request_queue_head;
2443        while (request != NULL) {
2444                next_request = request->next;
2445                release_request(request);
2446                request = next_request;
2447        }
2448
2449        return rc;
2450}