Andrew's git / gitweb.git / http-push.c
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http-push.con commit Update http-push functionality (aa1dbc9)
   1#include "cache.h"
   2#include "commit.h"
   3#include "pack.h"
   4#include "fetch.h"
   5#include "tag.h"
   6#include "blob.h"
   7#include "http.h"
   8#include "refs.h"
   9#include "revision.h"
  10
  11#include <expat.h>
  12
  13static const char http_push_usage[] =
  14"git-http-push [--complete] [--force] [--verbose] <url> <ref> [<ref>...]\n";
  15
  16#ifndef XML_STATUS_OK
  17enum XML_Status {
  18  XML_STATUS_OK = 1,
  19  XML_STATUS_ERROR = 0
  20};
  21#define XML_STATUS_OK    1
  22#define XML_STATUS_ERROR 0
  23#endif
  24
  25#define RANGE_HEADER_SIZE 30
  26
  27/* DAV methods */
  28#define DAV_LOCK "LOCK"
  29#define DAV_MKCOL "MKCOL"
  30#define DAV_MOVE "MOVE"
  31#define DAV_PROPFIND "PROPFIND"
  32#define DAV_PUT "PUT"
  33#define DAV_UNLOCK "UNLOCK"
  34
  35/* DAV lock flags */
  36#define DAV_PROP_LOCKWR (1u << 0)
  37#define DAV_PROP_LOCKEX (1u << 1)
  38#define DAV_LOCK_OK (1u << 2)
  39
  40/* DAV XML properties */
  41#define DAV_CTX_LOCKENTRY ".multistatus.response.propstat.prop.supportedlock.lockentry"
  42#define DAV_CTX_LOCKTYPE_WRITE ".multistatus.response.propstat.prop.supportedlock.lockentry.locktype.write"
  43#define DAV_CTX_LOCKTYPE_EXCLUSIVE ".multistatus.response.propstat.prop.supportedlock.lockentry.lockscope.exclusive"
  44#define DAV_ACTIVELOCK_OWNER ".prop.lockdiscovery.activelock.owner.href"
  45#define DAV_ACTIVELOCK_TIMEOUT ".prop.lockdiscovery.activelock.timeout"
  46#define DAV_ACTIVELOCK_TOKEN ".prop.lockdiscovery.activelock.locktoken.href"
  47#define DAV_PROPFIND_RESP ".multistatus.response"
  48#define DAV_PROPFIND_NAME ".multistatus.response.href"
  49#define DAV_PROPFIND_COLLECTION ".multistatus.response.propstat.prop.resourcetype.collection"
  50
  51/* DAV request body templates */
  52#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>"
  53#define PROPFIND_ALL_REQUEST "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:propfind xmlns:D=\"DAV:\">\n<D:allprop/>\n</D:propfind>"
  54#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>"
  55
  56#define LOCK_TIME 600
  57#define LOCK_REFRESH 30
  58
  59/* bits #0-4 in revision.h */
  60
  61#define LOCAL   (1u << 5)
  62#define REMOTE  (1u << 6)
  63#define PUSHING (1u << 7)
  64
  65static int pushing = 0;
  66static int aborted = 0;
  67static char remote_dir_exists[256];
  68
  69static struct curl_slist *no_pragma_header;
  70static struct curl_slist *default_headers;
  71
  72static int push_verbosely = 0;
  73static int push_all = 0;
  74static int force_all = 0;
  75
  76static struct object_list *objects = NULL;
  77
  78struct repo
  79{
  80        char *url;
  81        int path_len;
  82        struct packed_git *packs;
  83};
  84
  85static struct repo *remote = NULL;
  86static struct remote_lock *remote_locks = NULL;
  87
  88enum transfer_state {
  89        NEED_PUSH,
  90        RUN_MKCOL,
  91        RUN_PUT,
  92        RUN_MOVE,
  93        ABORTED,
  94        COMPLETE,
  95};
  96
  97struct transfer_request
  98{
  99        struct object *obj;
 100        char *url;
 101        char *dest;
 102        struct remote_lock *lock;
 103        struct curl_slist *headers;
 104        struct buffer buffer;
 105        char filename[PATH_MAX];
 106        char tmpfile[PATH_MAX];
 107        enum transfer_state state;
 108        CURLcode curl_result;
 109        char errorstr[CURL_ERROR_SIZE];
 110        long http_code;
 111        unsigned char real_sha1[20];
 112        SHA_CTX c;
 113        z_stream stream;
 114        int zret;
 115        int rename;
 116        struct active_request_slot *slot;
 117        struct transfer_request *next;
 118};
 119
 120static struct transfer_request *request_queue_head = NULL;
 121
 122struct xml_ctx
 123{
 124        char *name;
 125        int len;
 126        char *cdata;
 127        void (*userFunc)(struct xml_ctx *ctx, int tag_closed);
 128        void *userData;
 129};
 130
 131struct remote_lock
 132{
 133        char *url;
 134        char *owner;
 135        char *token;
 136        time_t start_time;
 137        long timeout;
 138        int active;
 139        int refreshing;
 140        struct remote_lock *next;
 141};
 142
 143struct remote_dentry
 144{
 145        char *base;
 146        char *name;
 147        int is_dir;
 148};
 149
 150static void finish_request(struct transfer_request *request);
 151
 152static void process_response(void *callback_data)
 153{
 154        struct transfer_request *request =
 155                (struct transfer_request *)callback_data;
 156
 157        finish_request(request);
 158}
 159
 160static void start_mkcol(struct transfer_request *request)
 161{
 162        char *hex = sha1_to_hex(request->obj->sha1);
 163        struct active_request_slot *slot;
 164        char *posn;
 165
 166        request->url = xmalloc(strlen(remote->url) + 13);
 167        strcpy(request->url, remote->url);
 168        posn = request->url + strlen(remote->url);
 169        strcpy(posn, "objects/");
 170        posn += 8;
 171        memcpy(posn, hex, 2);
 172        posn += 2;
 173        strcpy(posn, "/");
 174
 175        slot = get_active_slot();
 176        slot->callback_func = process_response;
 177        slot->callback_data = request;
 178        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); /* undo PUT setup */
 179        curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 180        curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
 181        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
 182        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 183
 184        if (start_active_slot(slot)) {
 185                request->slot = slot;
 186                request->state = RUN_MKCOL;
 187        } else {
 188                request->state = ABORTED;
 189                free(request->url);
 190                request->url = NULL;
 191        }
 192}
 193
 194static void start_put(struct transfer_request *request)
 195{
 196        char *hex = sha1_to_hex(request->obj->sha1);
 197        struct active_request_slot *slot;
 198        char *posn;
 199        char type[20];
 200        char hdr[50];
 201        void *unpacked;
 202        unsigned long len;
 203        int hdrlen;
 204        ssize_t size;
 205        z_stream stream;
 206
 207        unpacked = read_sha1_file(request->obj->sha1, type, &len);
 208        hdrlen = sprintf(hdr, "%s %lu", type, len) + 1;
 209
 210        /* Set it up */
 211        memset(&stream, 0, sizeof(stream));
 212        deflateInit(&stream, Z_BEST_COMPRESSION);
 213        size = deflateBound(&stream, len + hdrlen);
 214        request->buffer.buffer = xmalloc(size);
 215
 216        /* Compress it */
 217        stream.next_out = request->buffer.buffer;
 218        stream.avail_out = size;
 219
 220        /* First header.. */
 221        stream.next_in = (void *)hdr;
 222        stream.avail_in = hdrlen;
 223        while (deflate(&stream, 0) == Z_OK)
 224                /* nothing */;
 225
 226        /* Then the data itself.. */
 227        stream.next_in = unpacked;
 228        stream.avail_in = len;
 229        while (deflate(&stream, Z_FINISH) == Z_OK)
 230                /* nothing */;
 231        deflateEnd(&stream);
 232        free(unpacked);
 233
 234        request->buffer.size = stream.total_out;
 235        request->buffer.posn = 0;
 236
 237        request->url = xmalloc(strlen(remote->url) + 
 238                               strlen(request->lock->token) + 51);
 239        strcpy(request->url, remote->url);
 240        posn = request->url + strlen(remote->url);
 241        strcpy(posn, "objects/");
 242        posn += 8;
 243        memcpy(posn, hex, 2);
 244        posn += 2;
 245        *(posn++) = '/';
 246        strcpy(posn, hex + 2);
 247        request->dest = xmalloc(strlen(request->url) + 14);
 248        sprintf(request->dest, "Destination: %s", request->url);
 249        posn += 38;
 250        *(posn++) = '.';
 251        strcpy(posn, request->lock->token);
 252
 253        slot = get_active_slot();
 254        slot->callback_func = process_response;
 255        slot->callback_data = request;
 256        curl_easy_setopt(slot->curl, CURLOPT_INFILE, &request->buffer);
 257        curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, request->buffer.size);
 258        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
 259        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 260        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
 261        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
 262        curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
 263        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 264        curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 265
 266        if (start_active_slot(slot)) {
 267                request->slot = slot;
 268                request->state = RUN_PUT;
 269        } else {
 270                request->state = ABORTED;
 271                free(request->url);
 272                request->url = NULL;
 273        }
 274}
 275
 276static void start_move(struct transfer_request *request)
 277{
 278        struct active_request_slot *slot;
 279        struct curl_slist *dav_headers = NULL;
 280
 281        slot = get_active_slot();
 282        slot->callback_func = process_response;
 283        slot->callback_data = request;
 284        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); /* undo PUT setup */
 285        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MOVE);
 286        dav_headers = curl_slist_append(dav_headers, request->dest);
 287        dav_headers = curl_slist_append(dav_headers, "Overwrite: T");
 288        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 289        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 290        curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 291
 292        if (start_active_slot(slot)) {
 293                request->slot = slot;
 294                request->state = RUN_MOVE;
 295        } else {
 296                request->state = ABORTED;
 297                free(request->url);
 298                request->url = NULL;
 299        }
 300}
 301
 302static int refresh_lock(struct remote_lock *check_lock)
 303{
 304        struct active_request_slot *slot;
 305        char *if_header;
 306        char timeout_header[25];
 307        struct curl_slist *dav_headers = NULL;
 308        struct remote_lock *lock;
 309        int time_remaining;
 310        time_t current_time;
 311
 312        /* Refresh all active locks if they're close to expiring */
 313        for (lock = remote_locks; lock; lock = lock->next) {
 314                if (!lock->active)
 315                        continue;
 316
 317                current_time = time(NULL);
 318                time_remaining = lock->start_time + lock->timeout
 319                        - current_time;
 320                if (time_remaining > LOCK_REFRESH)
 321                        continue;
 322
 323                lock->refreshing = 1;
 324
 325                if_header = xmalloc(strlen(lock->token) + 25);
 326                sprintf(if_header, "If: (<opaquelocktoken:%s>)", lock->token);
 327                sprintf(timeout_header, "Timeout: Second-%ld", lock->timeout);
 328                dav_headers = curl_slist_append(dav_headers, if_header);
 329                dav_headers = curl_slist_append(dav_headers, timeout_header);
 330
 331                slot = get_active_slot();
 332                curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 333                curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 334                curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
 335                curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
 336                curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 337
 338                if (start_active_slot(slot)) {
 339                        run_active_slot(slot);
 340                        if (slot->curl_result != CURLE_OK) {
 341                                fprintf(stderr, "Got HTTP error %ld\n", slot->http_code);
 342                                lock->active = 0;
 343                        } else {
 344                                lock->active = 1;
 345                                lock->start_time = time(NULL);
 346                        }
 347                }
 348
 349                lock->refreshing = 0;
 350                curl_slist_free_all(dav_headers);
 351                free(if_header);
 352        }
 353
 354        if (check_lock)
 355                return check_lock->active;
 356        else
 357                return 0;
 358}
 359
 360static void release_request(struct transfer_request *request)
 361{
 362        struct transfer_request *entry = request_queue_head;
 363
 364        if (request == request_queue_head) {
 365                request_queue_head = request->next;
 366        } else {
 367                while (entry->next != NULL && entry->next != request)
 368                        entry = entry->next;
 369                if (entry->next == request)
 370                        entry->next = entry->next->next;
 371        }
 372
 373        if (request->url != NULL)
 374                free(request->url);
 375        free(request);
 376}
 377
 378static void finish_request(struct transfer_request *request)
 379{
 380        request->curl_result =  request->slot->curl_result;
 381        request->http_code = request->slot->http_code;
 382        request->slot = NULL;
 383
 384        /* Keep locks active */
 385        refresh_lock(request->lock);
 386
 387        if (request->headers != NULL)
 388                curl_slist_free_all(request->headers);
 389
 390        /* URL is reused for MOVE after PUT */
 391        if (request->state != RUN_PUT) {
 392                free(request->url);
 393                request->url = NULL;
 394        }
 395
 396        if (request->state == RUN_MKCOL) {
 397                if (request->curl_result == CURLE_OK ||
 398                    request->http_code == 405) {
 399                        remote_dir_exists[request->obj->sha1[0]] = 1;
 400                        start_put(request);
 401                } else {
 402                        fprintf(stderr, "MKCOL %s failed, aborting (%d/%ld)\n",
 403                                sha1_to_hex(request->obj->sha1),
 404                                request->curl_result, request->http_code);
 405                        request->state = ABORTED;
 406                        aborted = 1;
 407                }
 408        } else if (request->state == RUN_PUT) {
 409                if (request->curl_result == CURLE_OK) {
 410                        start_move(request);
 411                } else {
 412                        fprintf(stderr, "PUT %s failed, aborting (%d/%ld)\n",
 413                                sha1_to_hex(request->obj->sha1),
 414                                request->curl_result, request->http_code);
 415                        request->state = ABORTED;
 416                        aborted = 1;
 417                }
 418        } else if (request->state == RUN_MOVE) {
 419                if (request->curl_result == CURLE_OK) {
 420                        fprintf(stderr, "    sent %s\n",
 421                                sha1_to_hex(request->obj->sha1));
 422                        request->state = COMPLETE;
 423                        request->obj->flags |= REMOTE;
 424                        release_request(request);
 425                } else {
 426                        fprintf(stderr, "MOVE %s failed, aborting (%d/%ld)\n",
 427                                sha1_to_hex(request->obj->sha1),
 428                                request->curl_result, request->http_code);
 429                        request->state = ABORTED;
 430                        aborted = 1;
 431                }
 432        }
 433}
 434
 435void fill_active_slots(void)
 436{
 437        struct transfer_request *request = request_queue_head;
 438        struct active_request_slot *slot = active_queue_head;
 439        int num_transfers;
 440
 441        if (aborted)
 442                return;
 443
 444        while (active_requests < max_requests && request != NULL) {
 445                if (pushing && request->state == NEED_PUSH) {
 446                        if (remote_dir_exists[request->obj->sha1[0]] == 1) {
 447                                start_put(request);
 448                        } else {
 449                                start_mkcol(request);
 450                        }
 451                        curl_multi_perform(curlm, &num_transfers);
 452                }
 453                request = request->next;
 454        }
 455
 456        while (slot != NULL) {
 457                if (!slot->in_use && slot->curl != NULL) {
 458                        curl_easy_cleanup(slot->curl);
 459                        slot->curl = NULL;
 460                }
 461                slot = slot->next;
 462        }
 463}
 464
 465static void get_remote_object_list(unsigned char parent);
 466
 467static void add_request(struct object *obj, struct remote_lock *lock)
 468{
 469        struct transfer_request *request = request_queue_head;
 470        struct packed_git *target;
 471
 472        /*
 473         * Don't push the object if it's known to exist on the remote
 474         * or is already in the request queue
 475         */
 476        if (remote_dir_exists[obj->sha1[0]] == -1)
 477                get_remote_object_list(obj->sha1[0]);
 478        if (obj->flags & (REMOTE | PUSHING))
 479                return;
 480        target = find_sha1_pack(obj->sha1, remote->packs);
 481        if (target) {
 482                obj->flags |= REMOTE;
 483                return;
 484        }
 485
 486        obj->flags |= PUSHING;
 487        request = xmalloc(sizeof(*request));
 488        request->obj = obj;
 489        request->url = NULL;
 490        request->lock = lock;
 491        request->headers = NULL;
 492        request->state = NEED_PUSH;
 493        request->next = request_queue_head;
 494        request_queue_head = request;
 495
 496        fill_active_slots();
 497        step_active_slots();
 498}
 499
 500static int fetch_index(unsigned char *sha1)
 501{
 502        char *hex = sha1_to_hex(sha1);
 503        char *filename;
 504        char *url;
 505        char tmpfile[PATH_MAX];
 506        long prev_posn = 0;
 507        char range[RANGE_HEADER_SIZE];
 508        struct curl_slist *range_header = NULL;
 509
 510        FILE *indexfile;
 511        struct active_request_slot *slot;
 512
 513        /* Don't use the index if the pack isn't there */
 514        url = xmalloc(strlen(remote->url) + 65);
 515        sprintf(url, "%s/objects/pack/pack-%s.pack", remote->url, hex);
 516        slot = get_active_slot();
 517        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 518        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
 519        if (start_active_slot(slot)) {
 520                run_active_slot(slot);
 521                if (slot->curl_result != CURLE_OK) {
 522                        free(url);
 523                        return error("Unable to verify pack %s is available",
 524                                     hex);
 525                }
 526        } else {
 527                return error("Unable to start request");
 528        }
 529
 530        if (has_pack_index(sha1))
 531                return 0;
 532
 533        if (push_verbosely)
 534                fprintf(stderr, "Getting index for pack %s\n", hex);
 535        
 536        sprintf(url, "%s/objects/pack/pack-%s.idx", remote->url, hex);
 537        
 538        filename = sha1_pack_index_name(sha1);
 539        snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename);
 540        indexfile = fopen(tmpfile, "a");
 541        if (!indexfile)
 542                return error("Unable to open local file %s for pack index",
 543                             filename);
 544
 545        slot = get_active_slot();
 546        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 547        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 548        curl_easy_setopt(slot->curl, CURLOPT_FILE, indexfile);
 549        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
 550        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 551        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
 552        slot->local = indexfile;
 553
 554        /* If there is data present from a previous transfer attempt,
 555           resume where it left off */
 556        prev_posn = ftell(indexfile);
 557        if (prev_posn>0) {
 558                if (push_verbosely)
 559                        fprintf(stderr,
 560                                "Resuming fetch of index for pack %s at byte %ld\n",
 561                                hex, prev_posn);
 562                sprintf(range, "Range: bytes=%ld-", prev_posn);
 563                range_header = curl_slist_append(range_header, range);
 564                curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
 565        }
 566
 567        if (start_active_slot(slot)) {
 568                run_active_slot(slot);
 569                if (slot->curl_result != CURLE_OK) {
 570                        free(url);
 571                        fclose(indexfile);
 572                        return error("Unable to get pack index %s\n%s", url,
 573                                     curl_errorstr);
 574                }
 575        } else {
 576                free(url);
 577                fclose(indexfile);
 578                return error("Unable to start request");
 579        }
 580
 581        free(url);
 582        fclose(indexfile);
 583
 584        return move_temp_to_file(tmpfile, filename);
 585}
 586
 587static int setup_index(unsigned char *sha1)
 588{
 589        struct packed_git *new_pack;
 590
 591        if (fetch_index(sha1))
 592                return -1;
 593
 594        new_pack = parse_pack_index(sha1);
 595        new_pack->next = remote->packs;
 596        remote->packs = new_pack;
 597        return 0;
 598}
 599
 600static int fetch_indices(void)
 601{
 602        unsigned char sha1[20];
 603        char *url;
 604        struct buffer buffer;
 605        char *data;
 606        int i = 0;
 607
 608        struct active_request_slot *slot;
 609
 610        data = xmalloc(4096);
 611        memset(data, 0, 4096);
 612        buffer.size = 4096;
 613        buffer.posn = 0;
 614        buffer.buffer = data;
 615
 616        if (push_verbosely)
 617                fprintf(stderr, "Getting pack list\n");
 618        
 619        url = xmalloc(strlen(remote->url) + 21);
 620        sprintf(url, "%s/objects/info/packs", remote->url);
 621
 622        slot = get_active_slot();
 623        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
 624        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 625        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 626        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
 627        if (start_active_slot(slot)) {
 628                run_active_slot(slot);
 629                if (slot->curl_result != CURLE_OK) {
 630                        free(buffer.buffer);
 631                        free(url);
 632                        if (slot->http_code == 404)
 633                                return 0;
 634                        else
 635                                return error("%s", curl_errorstr);
 636                }
 637        } else {
 638                free(buffer.buffer);
 639                free(url);
 640                return error("Unable to start request");
 641        }
 642        free(url);
 643
 644        data = buffer.buffer;
 645        while (i < buffer.posn) {
 646                switch (data[i]) {
 647                case 'P':
 648                        i++;
 649                        if (i + 52 < buffer.posn &&
 650                            !strncmp(data + i, " pack-", 6) &&
 651                            !strncmp(data + i + 46, ".pack\n", 6)) {
 652                                get_sha1_hex(data + i + 6, sha1);
 653                                setup_index(sha1);
 654                                i += 51;
 655                                break;
 656                        }
 657                default:
 658                        while (data[i] != '\n')
 659                                i++;
 660                }
 661                i++;
 662        }
 663
 664        free(buffer.buffer);
 665        return 0;
 666}
 667
 668static inline int needs_quote(int ch)
 669{
 670        switch (ch) {
 671        case '/': case '-': case '.':
 672        case 'A'...'Z': case 'a'...'z': case '0'...'9':
 673                return 0;
 674        default:
 675                return 1;
 676        }
 677}
 678
 679static inline int hex(int v)
 680{
 681        if (v < 10) return '0' + v;
 682        else return 'A' + v - 10;
 683}
 684
 685static char *quote_ref_url(const char *base, const char *ref)
 686{
 687        const char *cp;
 688        char *dp, *qref;
 689        int len, baselen, ch;
 690
 691        baselen = strlen(base);
 692        len = baselen + 1;
 693        for (cp = ref; (ch = *cp) != 0; cp++, len++)
 694                if (needs_quote(ch))
 695                        len += 2; /* extra two hex plus replacement % */
 696        qref = xmalloc(len);
 697        memcpy(qref, base, baselen);
 698        for (cp = ref, dp = qref + baselen; (ch = *cp) != 0; cp++) {
 699                if (needs_quote(ch)) {
 700                        *dp++ = '%';
 701                        *dp++ = hex((ch >> 4) & 0xF);
 702                        *dp++ = hex(ch & 0xF);
 703                }
 704                else
 705                        *dp++ = ch;
 706        }
 707        *dp = 0;
 708
 709        return qref;
 710}
 711
 712int fetch_ref(char *ref, unsigned char *sha1)
 713{
 714        char *url;
 715        char hex[42];
 716        struct buffer buffer;
 717        char *base = remote->url;
 718        struct active_request_slot *slot;
 719        buffer.size = 41;
 720        buffer.posn = 0;
 721        buffer.buffer = hex;
 722        hex[41] = '\0';
 723        
 724        url = quote_ref_url(base, ref);
 725        slot = get_active_slot();
 726        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
 727        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 728        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
 729        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 730        if (start_active_slot(slot)) {
 731                run_active_slot(slot);
 732                if (slot->curl_result != CURLE_OK)
 733                        return error("Couldn't get %s for %s\n%s",
 734                                     url, ref, curl_errorstr);
 735        } else {
 736                return error("Unable to start request");
 737        }
 738
 739        hex[40] = '\0';
 740        get_sha1_hex(hex, sha1);
 741        return 0;
 742}
 743
 744static void one_remote_object(const char *hex)
 745{
 746        unsigned char sha1[20];
 747        struct object *obj;
 748
 749        if (get_sha1_hex(hex, sha1) != 0)
 750                return;
 751
 752        obj = lookup_object(sha1);
 753        if (!obj)
 754                obj = parse_object(sha1);
 755
 756        /* Ignore remote objects that don't exist locally */
 757        if (!obj)
 758                return;
 759
 760        obj->flags |= REMOTE;
 761        if (!object_list_contains(objects, obj))
 762                add_object(obj, &objects, NULL, "");
 763}
 764
 765static void handle_lockprop_ctx(struct xml_ctx *ctx, int tag_closed)
 766{
 767        int *lock_flags = (int *)ctx->userData;
 768
 769        if (tag_closed) {
 770                if (!strcmp(ctx->name, DAV_CTX_LOCKENTRY)) {
 771                        if ((*lock_flags & DAV_PROP_LOCKEX) &&
 772                            (*lock_flags & DAV_PROP_LOCKWR)) {
 773                                *lock_flags |= DAV_LOCK_OK;
 774                        }
 775                        *lock_flags &= DAV_LOCK_OK;
 776                } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_WRITE)) {
 777                        *lock_flags |= DAV_PROP_LOCKWR;
 778                } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_EXCLUSIVE)) {
 779                        *lock_flags |= DAV_PROP_LOCKEX;
 780                }
 781        }
 782}
 783
 784static void handle_new_lock_ctx(struct xml_ctx *ctx, int tag_closed)
 785{
 786        struct remote_lock *lock = (struct remote_lock *)ctx->userData;
 787
 788        if (tag_closed && ctx->cdata) {
 789                if (!strcmp(ctx->name, DAV_ACTIVELOCK_OWNER)) {
 790                        lock->owner = xmalloc(strlen(ctx->cdata) + 1);
 791                        strcpy(lock->owner, ctx->cdata);
 792                } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TIMEOUT)) {
 793                        if (!strncmp(ctx->cdata, "Second-", 7))
 794                                lock->timeout =
 795                                        strtol(ctx->cdata + 7, NULL, 10);
 796                } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TOKEN)) {
 797                        if (!strncmp(ctx->cdata, "opaquelocktoken:", 16)) {
 798                                lock->token = xmalloc(strlen(ctx->cdata) - 15);
 799                                strcpy(lock->token, ctx->cdata + 16);
 800                        }
 801                }
 802        }
 803}
 804
 805static void one_remote_ref(char *refname);
 806static void crawl_remote_refs(char *path);
 807
 808static void handle_crawl_ref_ctx(struct xml_ctx *ctx, int tag_closed)
 809{
 810        struct remote_dentry *dentry = (struct remote_dentry *)ctx->userData;
 811
 812
 813        if (tag_closed) {
 814                if (!strcmp(ctx->name, DAV_PROPFIND_RESP) && dentry->name) {
 815                        if (dentry->is_dir) {
 816                                if (strcmp(dentry->name, dentry->base)) {
 817                                        crawl_remote_refs(dentry->name);
 818                                }
 819                        } else {
 820                                one_remote_ref(dentry->name);
 821                        }
 822                } else if (!strcmp(ctx->name, DAV_PROPFIND_NAME) && ctx->cdata) {
 823                        dentry->name = xmalloc(strlen(ctx->cdata) -
 824                                               remote->path_len + 1);
 825                        strcpy(dentry->name,
 826                               ctx->cdata + remote->path_len);
 827                } else if (!strcmp(ctx->name, DAV_PROPFIND_COLLECTION)) {
 828                        dentry->is_dir = 1;
 829                }
 830        } else if (!strcmp(ctx->name, DAV_PROPFIND_RESP)) {
 831                dentry->name = NULL;
 832                dentry->is_dir = 0;
 833        }
 834}
 835
 836static void handle_remote_object_list_ctx(struct xml_ctx *ctx, int tag_closed)
 837{
 838        char *path;
 839        char *obj_hex;
 840
 841        if (tag_closed) {
 842                if (!strcmp(ctx->name, DAV_PROPFIND_NAME) && ctx->cdata) {
 843                        path = ctx->cdata + remote->path_len;
 844                        if (strlen(path) != 50)
 845                                return;
 846                        path += 9;
 847                        obj_hex = xmalloc(strlen(path));
 848                        strncpy(obj_hex, path, 2);
 849                        strcpy(obj_hex + 2, path + 3);
 850                        one_remote_object(obj_hex);
 851                        free(obj_hex);
 852                }
 853        }
 854}
 855
 856static void
 857xml_start_tag(void *userData, const char *name, const char **atts)
 858{
 859        struct xml_ctx *ctx = (struct xml_ctx *)userData;
 860        const char *c = index(name, ':');
 861        int new_len;
 862
 863        if (c == NULL)
 864                c = name;
 865        else
 866                c++;
 867
 868        new_len = strlen(ctx->name) + strlen(c) + 2;
 869
 870        if (new_len > ctx->len) {
 871                ctx->name = xrealloc(ctx->name, new_len);
 872                ctx->len = new_len;
 873        }
 874        strcat(ctx->name, ".");
 875        strcat(ctx->name, c);
 876
 877        if (ctx->cdata) {
 878                free(ctx->cdata);
 879                ctx->cdata = NULL;
 880        }
 881
 882        ctx->userFunc(ctx, 0);
 883}
 884
 885static void
 886xml_end_tag(void *userData, const char *name)
 887{
 888        struct xml_ctx *ctx = (struct xml_ctx *)userData;
 889        const char *c = index(name, ':');
 890        char *ep;
 891
 892        ctx->userFunc(ctx, 1);
 893
 894        if (c == NULL)
 895                c = name;
 896        else
 897                c++;
 898
 899        ep = ctx->name + strlen(ctx->name) - strlen(c) - 1;
 900        *ep = 0;
 901}
 902
 903static void
 904xml_cdata(void *userData, const XML_Char *s, int len)
 905{
 906        struct xml_ctx *ctx = (struct xml_ctx *)userData;
 907        if (ctx->cdata)
 908                free(ctx->cdata);
 909        ctx->cdata = xcalloc(len+1, 1);
 910        strncpy(ctx->cdata, s, len);
 911}
 912
 913static struct remote_lock *lock_remote(char *path, long timeout)
 914{
 915        struct active_request_slot *slot;
 916        struct buffer out_buffer;
 917        struct buffer in_buffer;
 918        char *out_data;
 919        char *in_data;
 920        char *url;
 921        char *ep;
 922        char timeout_header[25];
 923        struct remote_lock *lock = remote_locks;
 924        XML_Parser parser = XML_ParserCreate(NULL);
 925        enum XML_Status result;
 926        struct curl_slist *dav_headers = NULL;
 927        struct xml_ctx ctx;
 928
 929        url = xmalloc(strlen(remote->url) + strlen(path) + 1);
 930        sprintf(url, "%s%s", remote->url, path);
 931
 932        /* Make sure the url is not already locked */
 933        while (lock && strcmp(lock->url, url)) {
 934                lock = lock->next;
 935        }
 936        if (lock) {
 937                free(url);
 938                if (refresh_lock(lock))
 939                        return lock;
 940                else
 941                        return NULL;
 942        }
 943
 944        /* Make sure leading directories exist for the remote ref */
 945        ep = strchr(url + strlen(remote->url) + 11, '/');
 946        while (ep) {
 947                *ep = 0;
 948                slot = get_active_slot();
 949                curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 950                curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 951                curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
 952                curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 953                if (start_active_slot(slot)) {
 954                        run_active_slot(slot);
 955                        if (slot->curl_result != CURLE_OK &&
 956                            slot->http_code != 405) {
 957                                fprintf(stderr,
 958                                        "Unable to create branch path %s\n",
 959                                        url);
 960                                free(url);
 961                                return NULL;
 962                        }
 963                } else {
 964                        fprintf(stderr, "Unable to start request\n");
 965                        free(url);
 966                        return NULL;
 967                }
 968                *ep = '/';
 969                ep = strchr(ep + 1, '/');
 970        }
 971
 972        out_buffer.size = strlen(LOCK_REQUEST) + strlen(git_default_email) - 2;
 973        out_data = xmalloc(out_buffer.size + 1);
 974        snprintf(out_data, out_buffer.size + 1, LOCK_REQUEST, git_default_email);
 975        out_buffer.posn = 0;
 976        out_buffer.buffer = out_data;
 977
 978        in_buffer.size = 4096;
 979        in_data = xmalloc(in_buffer.size);
 980        in_buffer.posn = 0;
 981        in_buffer.buffer = in_data;
 982
 983        sprintf(timeout_header, "Timeout: Second-%ld", timeout);
 984        dav_headers = curl_slist_append(dav_headers, timeout_header);
 985        dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
 986
 987        slot = get_active_slot();
 988        curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
 989        curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.size);
 990        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
 991        curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
 992        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 993        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 994        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
 995        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
 996        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 997
 998        lock = xcalloc(1, sizeof(*lock));
 999        lock->owner = NULL;
1000        lock->token = NULL;
1001        lock->timeout = -1;
1002        lock->refreshing = 0;
1003
1004        if (start_active_slot(slot)) {
1005                run_active_slot(slot);
1006                if (slot->curl_result == CURLE_OK) {
1007                        ctx.name = xcalloc(10, 1);
1008                        ctx.len = 0;
1009                        ctx.cdata = NULL;
1010                        ctx.userFunc = handle_new_lock_ctx;
1011                        ctx.userData = lock;
1012                        XML_SetUserData(parser, &ctx);
1013                        XML_SetElementHandler(parser, xml_start_tag,
1014                                              xml_end_tag);
1015                        XML_SetCharacterDataHandler(parser, xml_cdata);
1016                        result = XML_Parse(parser, in_buffer.buffer,
1017                                           in_buffer.posn, 1);
1018                        free(ctx.name);
1019                        if (result != XML_STATUS_OK) {
1020                                fprintf(stderr, "XML error: %s\n",
1021                                        XML_ErrorString(
1022                                                XML_GetErrorCode(parser)));
1023                                lock->timeout = -1;
1024                        }
1025                }
1026        } else {
1027                fprintf(stderr, "Unable to start request\n");
1028        }
1029
1030        curl_slist_free_all(dav_headers);
1031        free(out_data);
1032        free(in_data);
1033
1034        if (lock->token == NULL || lock->timeout <= 0) {
1035                if (lock->token != NULL)
1036                        free(lock->token);
1037                if (lock->owner != NULL)
1038                        free(lock->owner);
1039                free(url);
1040                free(lock);
1041                lock = NULL;
1042        } else {
1043                lock->url = url;
1044                lock->active = 1;
1045                lock->start_time = time(NULL);
1046                lock->next = remote_locks;
1047                remote_locks = lock;
1048        }
1049
1050        return lock;
1051}
1052
1053static int unlock_remote(struct remote_lock *lock)
1054{
1055        struct active_request_slot *slot;
1056        char *lock_token_header;
1057        struct curl_slist *dav_headers = NULL;
1058        int rc = 0;
1059
1060        lock_token_header = xmalloc(strlen(lock->token) + 31);
1061        sprintf(lock_token_header, "Lock-Token: <opaquelocktoken:%s>",
1062                lock->token);
1063        dav_headers = curl_slist_append(dav_headers, lock_token_header);
1064
1065        slot = get_active_slot();
1066        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1067        curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1068        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_UNLOCK);
1069        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1070
1071        if (start_active_slot(slot)) {
1072                run_active_slot(slot);
1073                if (slot->curl_result == CURLE_OK)
1074                        rc = 1;
1075                else
1076                        fprintf(stderr, "Got HTTP error %ld\n",
1077                                slot->http_code);
1078        } else {
1079                fprintf(stderr, "Unable to start request\n");
1080        }
1081
1082        curl_slist_free_all(dav_headers);
1083        free(lock_token_header);
1084
1085        lock->active = 0;
1086
1087        return rc;
1088}
1089
1090static void crawl_remote_refs(char *path)
1091{
1092        char *url;
1093        struct active_request_slot *slot;
1094        struct buffer in_buffer;
1095        struct buffer out_buffer;
1096        char *in_data;
1097        char *out_data;
1098        XML_Parser parser = XML_ParserCreate(NULL);
1099        enum XML_Status result;
1100        struct curl_slist *dav_headers = NULL;
1101        struct xml_ctx ctx;
1102        struct remote_dentry dentry;
1103
1104        fprintf(stderr, "  %s\n", path);
1105
1106        dentry.base = path;
1107        dentry.name = NULL;
1108        dentry.is_dir = 0;
1109
1110        url = xmalloc(strlen(remote->url) + strlen(path) + 1);
1111        sprintf(url, "%s%s", remote->url, path);
1112
1113        out_buffer.size = strlen(PROPFIND_ALL_REQUEST);
1114        out_data = xmalloc(out_buffer.size + 1);
1115        snprintf(out_data, out_buffer.size + 1, PROPFIND_ALL_REQUEST);
1116        out_buffer.posn = 0;
1117        out_buffer.buffer = out_data;
1118
1119        in_buffer.size = 4096;
1120        in_data = xmalloc(in_buffer.size);
1121        in_buffer.posn = 0;
1122        in_buffer.buffer = in_data;
1123
1124        dav_headers = curl_slist_append(dav_headers, "Depth: 1");
1125        dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1126
1127        slot = get_active_slot();
1128        curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1129        curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.size);
1130        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1131        curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1132        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1133        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1134        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1135        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1136        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1137
1138        if (start_active_slot(slot)) {
1139                run_active_slot(slot);
1140                if (slot->curl_result == CURLE_OK) {
1141                        ctx.name = xcalloc(10, 1);
1142                        ctx.len = 0;
1143                        ctx.cdata = NULL;
1144                        ctx.userFunc = handle_crawl_ref_ctx;
1145                        ctx.userData = &dentry;
1146                        XML_SetUserData(parser, &ctx);
1147                        XML_SetElementHandler(parser, xml_start_tag,
1148                                              xml_end_tag);
1149                        XML_SetCharacterDataHandler(parser, xml_cdata);
1150                        result = XML_Parse(parser, in_buffer.buffer,
1151                                           in_buffer.posn, 1);
1152                        free(ctx.name);
1153
1154                        if (result != XML_STATUS_OK) {
1155                                fprintf(stderr, "XML error: %s\n",
1156                                        XML_ErrorString(
1157                                                XML_GetErrorCode(parser)));
1158                        }
1159                }
1160        } else {
1161                fprintf(stderr, "Unable to start request\n");
1162        }
1163
1164        free(url);
1165        free(out_data);
1166        free(in_buffer.buffer);
1167        curl_slist_free_all(dav_headers);
1168}
1169
1170static void get_remote_object_list(unsigned char parent)
1171{
1172        char *url;
1173        struct active_request_slot *slot;
1174        struct buffer in_buffer;
1175        struct buffer out_buffer;
1176        char *in_data;
1177        char *out_data;
1178        XML_Parser parser = XML_ParserCreate(NULL);
1179        enum XML_Status result;
1180        struct curl_slist *dav_headers = NULL;
1181        struct xml_ctx ctx;
1182        char path[] = "/objects/XX/";
1183        static const char hex[] = "0123456789abcdef";
1184        unsigned int val = parent;
1185
1186        path[9] = hex[val >> 4];
1187        path[10] = hex[val & 0xf];
1188        url = xmalloc(strlen(remote->url) + strlen(path) + 1);
1189        sprintf(url, "%s%s", remote->url, path);
1190
1191        out_buffer.size = strlen(PROPFIND_ALL_REQUEST);
1192        out_data = xmalloc(out_buffer.size + 1);
1193        snprintf(out_data, out_buffer.size + 1, PROPFIND_ALL_REQUEST);
1194        out_buffer.posn = 0;
1195        out_buffer.buffer = out_data;
1196
1197        in_buffer.size = 4096;
1198        in_data = xmalloc(in_buffer.size);
1199        in_buffer.posn = 0;
1200        in_buffer.buffer = in_data;
1201
1202        dav_headers = curl_slist_append(dav_headers, "Depth: 1");
1203        dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1204
1205        slot = get_active_slot();
1206        curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1207        curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.size);
1208        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1209        curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1210        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1211        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1212        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1213        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1214        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1215
1216        if (start_active_slot(slot)) {
1217                run_active_slot(slot);
1218                if (slot->curl_result == CURLE_OK) {
1219                        remote_dir_exists[parent] = 1;
1220                        ctx.name = xcalloc(10, 1);
1221                        ctx.len = 0;
1222                        ctx.cdata = NULL;
1223                        ctx.userFunc = handle_remote_object_list_ctx;
1224                        XML_SetUserData(parser, &ctx);
1225                        XML_SetElementHandler(parser, xml_start_tag,
1226                                              xml_end_tag);
1227                        XML_SetCharacterDataHandler(parser, xml_cdata);
1228                        result = XML_Parse(parser, in_buffer.buffer,
1229                                           in_buffer.posn, 1);
1230                        free(ctx.name);
1231
1232                        if (result != XML_STATUS_OK) {
1233                                fprintf(stderr, "XML error: %s\n",
1234                                        XML_ErrorString(
1235                                                XML_GetErrorCode(parser)));
1236                        }
1237                } else {
1238                        remote_dir_exists[parent] = 0;
1239                }
1240        } else {
1241                fprintf(stderr, "Unable to start request\n");
1242        }
1243
1244        free(url);
1245        free(out_data);
1246        free(in_buffer.buffer);
1247        curl_slist_free_all(dav_headers);
1248}
1249
1250static int locking_available(void)
1251{
1252        struct active_request_slot *slot;
1253        struct buffer in_buffer;
1254        struct buffer out_buffer;
1255        char *in_data;
1256        char *out_data;
1257        XML_Parser parser = XML_ParserCreate(NULL);
1258        enum XML_Status result;
1259        struct curl_slist *dav_headers = NULL;
1260        struct xml_ctx ctx;
1261        int lock_flags = 0;
1262
1263        out_buffer.size =
1264                strlen(PROPFIND_SUPPORTEDLOCK_REQUEST) +
1265                strlen(remote->url) - 2;
1266        out_data = xmalloc(out_buffer.size + 1);
1267        snprintf(out_data, out_buffer.size + 1,
1268                 PROPFIND_SUPPORTEDLOCK_REQUEST, remote->url);
1269        out_buffer.posn = 0;
1270        out_buffer.buffer = out_data;
1271
1272        in_buffer.size = 4096;
1273        in_data = xmalloc(in_buffer.size);
1274        in_buffer.posn = 0;
1275        in_buffer.buffer = in_data;
1276
1277        dav_headers = curl_slist_append(dav_headers, "Depth: 0");
1278        dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1279        
1280        slot = get_active_slot();
1281        curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1282        curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.size);
1283        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1284        curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1285        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1286        curl_easy_setopt(slot->curl, CURLOPT_URL, remote->url);
1287        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1288        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1289        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1290
1291        if (start_active_slot(slot)) {
1292                run_active_slot(slot);
1293                if (slot->curl_result == CURLE_OK) {
1294                        ctx.name = xcalloc(10, 1);
1295                        ctx.len = 0;
1296                        ctx.cdata = NULL;
1297                        ctx.userFunc = handle_lockprop_ctx;
1298                        ctx.userData = &lock_flags;
1299                        XML_SetUserData(parser, &ctx);
1300                        XML_SetElementHandler(parser, xml_start_tag,
1301                                              xml_end_tag);
1302                        result = XML_Parse(parser, in_buffer.buffer,
1303                                           in_buffer.posn, 1);
1304                        free(ctx.name);
1305
1306                        if (result != XML_STATUS_OK) {
1307                                fprintf(stderr, "XML error: %s\n",
1308                                        XML_ErrorString(
1309                                                XML_GetErrorCode(parser)));
1310                                lock_flags = 0;
1311                        }
1312                }
1313        } else {
1314                fprintf(stderr, "Unable to start request\n");
1315        }
1316
1317        free(out_data);
1318        free(in_buffer.buffer);
1319        curl_slist_free_all(dav_headers);
1320
1321        return lock_flags;
1322}
1323
1324static struct object_list **process_blob(struct blob *blob,
1325                                         struct object_list **p,
1326                                         struct name_path *path,
1327                                         const char *name)
1328{
1329        struct object *obj = &blob->object;
1330
1331        obj->flags |= LOCAL;
1332
1333        if (obj->flags & (UNINTERESTING | SEEN))
1334                return p;
1335
1336        obj->flags |= SEEN;
1337        return add_object(obj, p, path, name);
1338}
1339
1340static struct object_list **process_tree(struct tree *tree,
1341                                         struct object_list **p,
1342                                         struct name_path *path,
1343                                         const char *name)
1344{
1345        struct object *obj = &tree->object;
1346        struct tree_entry_list *entry;
1347        struct name_path me;
1348
1349        obj->flags |= LOCAL;
1350
1351        if (obj->flags & (UNINTERESTING | SEEN))
1352                return p;
1353        if (parse_tree(tree) < 0)
1354                die("bad tree object %s", sha1_to_hex(obj->sha1));
1355
1356        obj->flags |= SEEN;
1357        p = add_object(obj, p, NULL, name);
1358        me.up = path;
1359        me.elem = name;
1360        me.elem_len = strlen(name);
1361        entry = tree->entries;
1362        tree->entries = NULL;
1363        while (entry) {
1364                struct tree_entry_list *next = entry->next;
1365                if (entry->directory)
1366                        p = process_tree(entry->item.tree, p, &me, entry->name);
1367                else
1368                        p = process_blob(entry->item.blob, p, &me, entry->name);
1369                free(entry);
1370                entry = next;
1371        }
1372        return p;
1373}
1374
1375static void get_delta(struct rev_info *revs, struct remote_lock *lock)
1376{
1377        struct commit *commit;
1378        struct object_list **p = &objects, *pending;
1379
1380        while ((commit = get_revision(revs)) != NULL) {
1381                p = process_tree(commit->tree, p, NULL, "");
1382                commit->object.flags |= LOCAL;
1383                if (!(commit->object.flags & UNINTERESTING))
1384                        add_request(&commit->object, lock);
1385        }
1386
1387        for (pending = revs->pending_objects; pending; pending = pending->next) {
1388                struct object *obj = pending->item;
1389                const char *name = pending->name;
1390
1391                if (obj->flags & (UNINTERESTING | SEEN))
1392                        continue;
1393                if (obj->type == tag_type) {
1394                        obj->flags |= SEEN;
1395                        p = add_object(obj, p, NULL, name);
1396                        continue;
1397                }
1398                if (obj->type == tree_type) {
1399                        p = process_tree((struct tree *)obj, p, NULL, name);
1400                        continue;
1401                }
1402                if (obj->type == blob_type) {
1403                        p = process_blob((struct blob *)obj, p, NULL, name);
1404                        continue;
1405                }
1406                die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
1407        }
1408
1409        while (objects) {
1410                if (!(objects->item->flags & UNINTERESTING))
1411                        add_request(objects->item, lock);
1412                objects = objects->next;
1413        }
1414}
1415
1416static int update_remote(unsigned char *sha1, struct remote_lock *lock)
1417{
1418        struct active_request_slot *slot;
1419        char *out_data;
1420        char *if_header;
1421        struct buffer out_buffer;
1422        struct curl_slist *dav_headers = NULL;
1423        int i;
1424
1425        if_header = xmalloc(strlen(lock->token) + 25);
1426        sprintf(if_header, "If: (<opaquelocktoken:%s>)", lock->token);
1427        dav_headers = curl_slist_append(dav_headers, if_header);
1428
1429        out_buffer.size = 41;
1430        out_data = xmalloc(out_buffer.size + 1);
1431        i = snprintf(out_data, out_buffer.size + 1, "%s\n", sha1_to_hex(sha1));
1432        if (i != out_buffer.size) {
1433                fprintf(stderr, "Unable to initialize PUT request body\n");
1434                return 0;
1435        }
1436        out_buffer.posn = 0;
1437        out_buffer.buffer = out_data;
1438
1439        slot = get_active_slot();
1440        curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1441        curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.size);
1442        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1443        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1444        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
1445        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1446        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1447        curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
1448        curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1449
1450        if (start_active_slot(slot)) {
1451                run_active_slot(slot);
1452                free(out_data);
1453                free(if_header);
1454                if (slot->curl_result != CURLE_OK) {
1455                        fprintf(stderr,
1456                                "PUT error: curl result=%d, HTTP code=%ld\n",
1457                                slot->curl_result, slot->http_code);
1458                        /* We should attempt recovery? */
1459                        return 0;
1460                }
1461        } else {
1462                free(out_data);
1463                free(if_header);
1464                fprintf(stderr, "Unable to start PUT request\n");
1465                return 0;
1466        }
1467
1468        return 1;
1469}
1470
1471static struct ref *local_refs, **local_tail;
1472static struct ref *remote_refs, **remote_tail;
1473
1474static int one_local_ref(const char *refname, const unsigned char *sha1)
1475{
1476        struct ref *ref;
1477        int len = strlen(refname) + 1;
1478        ref = xcalloc(1, sizeof(*ref) + len);
1479        memcpy(ref->new_sha1, sha1, 20);
1480        memcpy(ref->name, refname, len);
1481        *local_tail = ref;
1482        local_tail = &ref->next;
1483        return 0;
1484}
1485
1486static void one_remote_ref(char *refname)
1487{
1488        struct ref *ref;
1489        unsigned char remote_sha1[20];
1490
1491        if (fetch_ref(refname, remote_sha1) != 0) {
1492                fprintf(stderr,
1493                        "Unable to fetch ref %s from %s\n",
1494                        refname, remote->url);
1495                return;
1496        }
1497
1498        int len = strlen(refname) + 1;
1499        ref = xcalloc(1, sizeof(*ref) + len);
1500        memcpy(ref->old_sha1, remote_sha1, 20);
1501        memcpy(ref->name, refname, len);
1502        *remote_tail = ref;
1503        remote_tail = &ref->next;
1504}
1505
1506static void get_local_heads(void)
1507{
1508        local_tail = &local_refs;
1509        for_each_ref(one_local_ref);
1510}
1511
1512static void get_dav_remote_heads(void)
1513{
1514        remote_tail = &remote_refs;
1515        crawl_remote_refs("refs/");
1516}
1517
1518static int is_zero_sha1(const unsigned char *sha1)
1519{
1520        int i;
1521
1522        for (i = 0; i < 20; i++) {
1523                if (*sha1++)
1524                        return 0;
1525        }
1526        return 1;
1527}
1528
1529static void unmark_and_free(struct commit_list *list, unsigned int mark)
1530{
1531        while (list) {
1532                struct commit_list *temp = list;
1533                temp->item->object.flags &= ~mark;
1534                list = temp->next;
1535                free(temp);
1536        }
1537}
1538
1539static int ref_newer(const unsigned char *new_sha1,
1540                     const unsigned char *old_sha1)
1541{
1542        struct object *o;
1543        struct commit *old, *new;
1544        struct commit_list *list, *used;
1545        int found = 0;
1546
1547        /* Both new and old must be commit-ish and new is descendant of
1548         * old.  Otherwise we require --force.
1549         */
1550        o = deref_tag(parse_object(old_sha1), NULL, 0);
1551        if (!o || o->type != commit_type)
1552                return 0;
1553        old = (struct commit *) o;
1554
1555        o = deref_tag(parse_object(new_sha1), NULL, 0);
1556        if (!o || o->type != commit_type)
1557                return 0;
1558        new = (struct commit *) o;
1559
1560        if (parse_commit(new) < 0)
1561                return 0;
1562
1563        used = list = NULL;
1564        commit_list_insert(new, &list);
1565        while (list) {
1566                new = pop_most_recent_commit(&list, TMP_MARK);
1567                commit_list_insert(new, &used);
1568                if (new == old) {
1569                        found = 1;
1570                        break;
1571                }
1572        }
1573        unmark_and_free(list, TMP_MARK);
1574        unmark_and_free(used, TMP_MARK);
1575        return found;
1576}
1577
1578static void mark_edge_parents_uninteresting(struct commit *commit)
1579{
1580        struct commit_list *parents;
1581
1582        for (parents = commit->parents; parents; parents = parents->next) {
1583                struct commit *parent = parents->item;
1584                if (!(parent->object.flags & UNINTERESTING))
1585                        continue;
1586                mark_tree_uninteresting(parent->tree);
1587        }
1588}
1589
1590static void mark_edges_uninteresting(struct commit_list *list)
1591{
1592        for ( ; list; list = list->next) {
1593                struct commit *commit = list->item;
1594
1595                if (commit->object.flags & UNINTERESTING) {
1596                        mark_tree_uninteresting(commit->tree);
1597                        continue;
1598                }
1599                mark_edge_parents_uninteresting(commit);
1600        }
1601}
1602
1603int main(int argc, char **argv)
1604{
1605        struct transfer_request *request;
1606        struct transfer_request *next_request;
1607        int nr_refspec = 0;
1608        char **refspec = NULL;
1609        struct remote_lock *ref_lock;
1610        struct rev_info revs;
1611        int rc = 0;
1612        int i;
1613
1614        setup_git_directory();
1615        setup_ident();
1616
1617        remote = xmalloc(sizeof(*remote));
1618        remote->url = NULL;
1619        remote->path_len = 0;
1620        remote->packs = NULL;
1621
1622        argv++;
1623        for (i = 1; i < argc; i++, argv++) {
1624                char *arg = *argv;
1625
1626                if (*arg == '-') {
1627                        if (!strcmp(arg, "--all")) {
1628                                push_all = 1;
1629                                continue;
1630                        }
1631                        if (!strcmp(arg, "--force")) {
1632                                force_all = 1;
1633                                continue;
1634                        }
1635                        if (!strcmp(arg, "--verbose")) {
1636                                push_verbosely = 1;
1637                                continue;
1638                        }
1639                        usage(http_push_usage);
1640                }
1641                if (!remote->url) {
1642                        remote->url = arg;
1643                        char *path = strstr(arg, "//");
1644                        if (path) {
1645                                path = index(path+2, '/');
1646                                if (path)
1647                                        remote->path_len = strlen(path);
1648                        }
1649                        continue;
1650                }
1651                refspec = argv;
1652                nr_refspec = argc - i;
1653                break;
1654        }
1655
1656        if (!remote->url)
1657                usage(http_push_usage);
1658
1659        memset(remote_dir_exists, -1, 256);
1660
1661        http_init();
1662
1663        no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
1664        default_headers = curl_slist_append(default_headers, "Range:");
1665        default_headers = curl_slist_append(default_headers, "Destination:");
1666        default_headers = curl_slist_append(default_headers, "If:");
1667        default_headers = curl_slist_append(default_headers,
1668                                            "Pragma: no-cache");
1669
1670        /* Verify DAV compliance/lock support */
1671        if (!locking_available()) {
1672                fprintf(stderr, "Error: no DAV locking support on remote repo %s\n", remote->url);
1673                rc = 1;
1674                goto cleanup;
1675        }
1676
1677        /* Get a list of all local and remote heads to validate refspecs */
1678        get_local_heads();
1679        fprintf(stderr, "Fetching remote heads...\n");
1680        get_dav_remote_heads();
1681
1682        /* match them up */
1683        if (!remote_tail)
1684                remote_tail = &remote_refs;
1685        if (match_refs(local_refs, remote_refs, &remote_tail,
1686                       nr_refspec, refspec, push_all))
1687                return -1;
1688        if (!remote_refs) {
1689                fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
1690                return 0;
1691        }
1692
1693        int ret = 0;
1694        int new_refs = 0;
1695        struct ref *ref;
1696        for (ref = remote_refs; ref; ref = ref->next) {
1697                char old_hex[60], *new_hex;
1698                if (!ref->peer_ref)
1699                        continue;
1700                if (!memcmp(ref->old_sha1, ref->peer_ref->new_sha1, 20)) {
1701                        if (push_verbosely || 1)
1702                                fprintf(stderr, "'%s': up-to-date\n", ref->name);
1703                        continue;
1704                }
1705
1706                if (!force_all &&
1707                    !is_zero_sha1(ref->old_sha1) &&
1708                    !ref->force) {
1709                        if (!has_sha1_file(ref->old_sha1) ||
1710                            !ref_newer(ref->peer_ref->new_sha1,
1711                                       ref->old_sha1)) {
1712                                /* We do not have the remote ref, or
1713                                 * we know that the remote ref is not
1714                                 * an ancestor of what we are trying to
1715                                 * push.  Either way this can be losing
1716                                 * commits at the remote end and likely
1717                                 * we were not up to date to begin with.
1718                                 */
1719                                error("remote '%s' is not a strict "
1720                                      "subset of local ref '%s'. "
1721                                      "maybe you are not up-to-date and "
1722                                      "need to pull first?",
1723                                      ref->name,
1724                                      ref->peer_ref->name);
1725                                ret = -2;
1726                                continue;
1727                        }
1728                }
1729                memcpy(ref->new_sha1, ref->peer_ref->new_sha1, 20);
1730                if (is_zero_sha1(ref->new_sha1)) {
1731                        error("cannot happen anymore");
1732                        ret = -3;
1733                        continue;
1734                }
1735                new_refs++;
1736                strcpy(old_hex, sha1_to_hex(ref->old_sha1));
1737                new_hex = sha1_to_hex(ref->new_sha1);
1738
1739                fprintf(stderr, "updating '%s'", ref->name);
1740                if (strcmp(ref->name, ref->peer_ref->name))
1741                        fprintf(stderr, " using '%s'", ref->peer_ref->name);
1742                fprintf(stderr, "\n  from %s\n  to   %s\n", old_hex, new_hex);
1743
1744
1745                /* Lock remote branch ref */
1746                ref_lock = lock_remote(ref->name, LOCK_TIME);
1747                if (ref_lock == NULL) {
1748                        fprintf(stderr, "Unable to lock remote branch %s\n",
1749                                ref->name);
1750                        rc = 1;
1751                        continue;
1752                }
1753
1754                /* Set up revision info for this refspec */
1755                const char *commit_argv[3];
1756                int commit_argc = 2;
1757                char *new_sha1_hex = strdup(sha1_to_hex(ref->new_sha1));
1758                char *old_sha1_hex = NULL;
1759                commit_argv[1] = new_sha1_hex;
1760                if (!push_all && !is_zero_sha1(ref->old_sha1)) {
1761                        old_sha1_hex = xmalloc(42);
1762                        sprintf(old_sha1_hex, "^%s",
1763                                sha1_to_hex(ref->old_sha1));
1764                        commit_argv[2] = old_sha1_hex;
1765                        commit_argc++;
1766                }
1767                revs.commits = NULL;
1768                setup_revisions(commit_argc, commit_argv, &revs, NULL);
1769                revs.tag_objects = 1;
1770                revs.tree_objects = 1;
1771                revs.blob_objects = 1;
1772                free(new_sha1_hex);
1773                if (old_sha1_hex) {
1774                        free(old_sha1_hex);
1775                        commit_argv[1] = NULL;
1776                }
1777
1778                /* Generate a list of objects that need to be pushed */
1779                pushing = 0;
1780                prepare_revision_walk(&revs);
1781                mark_edges_uninteresting(revs.commits);
1782                fetch_indices();
1783                get_delta(&revs, ref_lock);
1784                finish_all_active_slots();
1785
1786                /* Push missing objects to remote, this would be a
1787                   convenient time to pack them first if appropriate. */
1788                pushing = 1;
1789                fill_active_slots();
1790                finish_all_active_slots();
1791
1792                /* Update the remote branch if all went well */
1793                if (aborted || !update_remote(ref->new_sha1, ref_lock)) {
1794                        rc = 1;
1795                        goto unlock;
1796                }
1797
1798        unlock:
1799                if (!rc)
1800                        fprintf(stderr, "    done\n");
1801                unlock_remote(ref_lock);
1802        }
1803
1804 cleanup:
1805        free(remote);
1806
1807        curl_slist_free_all(no_pragma_header);
1808        curl_slist_free_all(default_headers);
1809
1810        http_cleanup();
1811
1812        request = request_queue_head;
1813        while (request != NULL) {
1814                next_request = request->next;
1815                release_request(request);
1816                request = next_request;
1817        }
1818
1819        return rc;
1820}