Andrew's git / gitweb.git / http-fetch.c
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http-fetch.con commit [PATCH] Random documentation fixes (df8baa4)
   1#include "cache.h"
   2#include "commit.h"
   3#include "pack.h"
   4#include "fetch.h"
   5
   6#include <curl/curl.h>
   7#include <curl/easy.h>
   8
   9#if LIBCURL_VERSION_NUM < 0x070704
  10#define curl_global_cleanup() do { /* nothing */ } while(0)
  11#endif
  12#if LIBCURL_VERSION_NUM < 0x070800
  13#define curl_global_init(a) do { /* nothing */ } while(0)
  14#endif
  15
  16#define PREV_BUF_SIZE 4096
  17#define RANGE_HEADER_SIZE 30
  18
  19static CURL *curl;
  20static struct curl_slist *no_pragma_header;
  21static struct curl_slist *no_range_header;
  22static char curl_errorstr[CURL_ERROR_SIZE];
  23
  24static char *initial_base;
  25
  26struct alt_base
  27{
  28        char *base;
  29        int got_indices;
  30        struct packed_git *packs;
  31        struct alt_base *next;
  32};
  33
  34static struct alt_base *alt = NULL;
  35
  36static SHA_CTX c;
  37static z_stream stream;
  38
  39static int local;
  40static int zret;
  41
  42static int curl_ssl_verify;
  43static char *ssl_cert;
  44static char *ssl_key;
  45static char *ssl_capath;
  46static char *ssl_cainfo;
  47
  48struct buffer
  49{
  50        size_t posn;
  51        size_t size;
  52        void *buffer;
  53};
  54
  55static size_t fwrite_buffer(void *ptr, size_t eltsize, size_t nmemb,
  56                            struct buffer *buffer)
  57{
  58        size_t size = eltsize * nmemb;
  59        if (size > buffer->size - buffer->posn)
  60                size = buffer->size - buffer->posn;
  61        memcpy(buffer->buffer + buffer->posn, ptr, size);
  62        buffer->posn += size;
  63        return size;
  64}
  65
  66static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
  67                               void *data)
  68{
  69        unsigned char expn[4096];
  70        size_t size = eltsize * nmemb;
  71        int posn = 0;
  72        do {
  73                ssize_t retval = write(local, ptr + posn, size - posn);
  74                if (retval < 0)
  75                        return posn;
  76                posn += retval;
  77        } while (posn < size);
  78
  79        stream.avail_in = size;
  80        stream.next_in = ptr;
  81        do {
  82                stream.next_out = expn;
  83                stream.avail_out = sizeof(expn);
  84                zret = inflate(&stream, Z_SYNC_FLUSH);
  85                SHA1_Update(&c, expn, sizeof(expn) - stream.avail_out);
  86        } while (stream.avail_in && zret == Z_OK);
  87        return size;
  88}
  89
  90void prefetch(unsigned char *sha1)
  91{
  92}
  93
  94int relink_or_rename(char *old, char *new) {
  95        int ret;
  96
  97        ret = link(old, new);
  98        if (ret < 0) {
  99                /* Same Coda hack as in write_sha1_file(sha1_file.c) */
 100                ret = errno;
 101                if (ret == EXDEV && !rename(old, new))
 102                        return 0;
 103        }
 104        unlink(old);
 105        if (ret) {
 106                if (ret != EEXIST)
 107                        return ret;
 108        }
 109
 110        return 0;
 111}
 112
 113static int got_alternates = 0;
 114
 115static int fetch_index(struct alt_base *repo, unsigned char *sha1)
 116{
 117        char *filename;
 118        char *url;
 119        char tmpfile[PATH_MAX];
 120        int ret;
 121        long prev_posn = 0;
 122        char range[RANGE_HEADER_SIZE];
 123        struct curl_slist *range_header = NULL;
 124        CURLcode curl_result;
 125
 126        FILE *indexfile;
 127
 128        if (has_pack_index(sha1))
 129                return 0;
 130
 131        if (get_verbosely)
 132                fprintf(stderr, "Getting index for pack %s\n",
 133                        sha1_to_hex(sha1));
 134        
 135        url = xmalloc(strlen(repo->base) + 64);
 136        sprintf(url, "%s/objects/pack/pack-%s.idx",
 137                repo->base, sha1_to_hex(sha1));
 138        
 139        filename = sha1_pack_index_name(sha1);
 140        snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename);
 141        indexfile = fopen(tmpfile, "a");
 142        if (!indexfile)
 143                return error("Unable to open local file %s for pack index",
 144                             filename);
 145
 146        curl_easy_setopt(curl, CURLOPT_FILE, indexfile);
 147        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite);
 148        curl_easy_setopt(curl, CURLOPT_URL, url);
 149        curl_easy_setopt(curl, CURLOPT_HTTPHEADER, no_pragma_header);
 150        curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 151        
 152        /* If there is data present from a previous transfer attempt,
 153           resume where it left off */
 154        prev_posn = ftell(indexfile);
 155        if (prev_posn>0) {
 156                if (get_verbosely)
 157                        fprintf(stderr,
 158                                "Resuming fetch of index for pack %s at byte %ld\n",
 159                                sha1_to_hex(sha1), prev_posn);
 160                sprintf(range, "Range: bytes=%ld-", prev_posn);
 161                range_header = curl_slist_append(range_header, range);
 162                curl_easy_setopt(curl, CURLOPT_HTTPHEADER, range_header);
 163        }
 164
 165        /* Clear out the Range: header after performing the request, so
 166           other curl requests don't inherit inappropriate header data */
 167        curl_result = curl_easy_perform(curl);
 168        curl_easy_setopt(curl, CURLOPT_HTTPHEADER, no_range_header);
 169        if (curl_result != 0) {
 170                fclose(indexfile);
 171                return error("Unable to get pack index %s\n%s", url,
 172                             curl_errorstr);
 173        }
 174
 175        fclose(indexfile);
 176
 177        ret = relink_or_rename(tmpfile, filename);
 178        if (ret)
 179                return error("unable to write index filename %s: %s",
 180                             filename, strerror(ret));
 181
 182        return 0;
 183}
 184
 185static int setup_index(struct alt_base *repo, unsigned char *sha1)
 186{
 187        struct packed_git *new_pack;
 188        if (has_pack_file(sha1))
 189                return 0; // don't list this as something we can get
 190
 191        if (fetch_index(repo, sha1))
 192                return -1;
 193
 194        new_pack = parse_pack_index(sha1);
 195        new_pack->next = repo->packs;
 196        repo->packs = new_pack;
 197        return 0;
 198}
 199
 200static int fetch_alternates(char *base)
 201{
 202        int ret = 0;
 203        struct buffer buffer;
 204        char *url;
 205        char *data;
 206        int i = 0;
 207        int http_specific = 1;
 208        if (got_alternates)
 209                return 0;
 210        data = xmalloc(4096);
 211        buffer.size = 4095;
 212        buffer.posn = 0;
 213        buffer.buffer = data;
 214
 215        if (get_verbosely)
 216                fprintf(stderr, "Getting alternates list\n");
 217        
 218        url = xmalloc(strlen(base) + 31);
 219        sprintf(url, "%s/objects/info/http-alternates", base);
 220
 221        curl_easy_setopt(curl, CURLOPT_FILE, &buffer);
 222        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 223        curl_easy_setopt(curl, CURLOPT_URL, url);
 224
 225        if (curl_easy_perform(curl) || !buffer.posn) {
 226                http_specific = 0;
 227
 228                sprintf(url, "%s/objects/info/alternates", base);
 229                
 230                curl_easy_setopt(curl, CURLOPT_FILE, &buffer);
 231                curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 232                curl_easy_setopt(curl, CURLOPT_URL, url);
 233                
 234                if (curl_easy_perform(curl)) {
 235                        return 0;
 236                }
 237        }
 238
 239        data[buffer.posn] = '\0';
 240
 241        while (i < buffer.posn) {
 242                int posn = i;
 243                while (posn < buffer.posn && data[posn] != '\n')
 244                        posn++;
 245                if (data[posn] == '\n') {
 246                        int okay = 0;
 247                        int serverlen = 0;
 248                        struct alt_base *newalt;
 249                        char *target = NULL;
 250                        if (data[i] == '/') {
 251                                serverlen = strchr(base + 8, '/') - base;
 252                                okay = 1;
 253                        } else if (!memcmp(data + i, "../", 3)) {
 254                                i += 3;
 255                                serverlen = strlen(base);
 256                                while (i + 2 < posn && 
 257                                       !memcmp(data + i, "../", 3)) {
 258                                        do {
 259                                                serverlen--;
 260                                        } while (serverlen &&
 261                                                 base[serverlen - 1] != '/');
 262                                        i += 3;
 263                                }
 264                                // If the server got removed, give up.
 265                                okay = strchr(base, ':') - base + 3 < 
 266                                        serverlen;
 267                        } else if (http_specific) {
 268                                char *colon = strchr(data + i, ':');
 269                                char *slash = strchr(data + i, '/');
 270                                if (colon && slash && colon < data + posn &&
 271                                    slash < data + posn && colon < slash) {
 272                                        okay = 1;
 273                                }
 274                        }
 275                        // skip 'objects' at end
 276                        if (okay) {
 277                                target = xmalloc(serverlen + posn - i - 6);
 278                                strncpy(target, base, serverlen);
 279                                strncpy(target + serverlen, data + i,
 280                                        posn - i - 7);
 281                                target[serverlen + posn - i - 7] = '\0';
 282                                if (get_verbosely)
 283                                        fprintf(stderr, 
 284                                                "Also look at %s\n", target);
 285                                newalt = xmalloc(sizeof(*newalt));
 286                                newalt->next = alt;
 287                                newalt->base = target;
 288                                newalt->got_indices = 0;
 289                                newalt->packs = NULL;
 290                                alt = newalt;
 291                                ret++;
 292                        }
 293                }
 294                i = posn + 1;
 295        }
 296        got_alternates = 1;
 297        
 298        return ret;
 299}
 300
 301static int fetch_indices(struct alt_base *repo)
 302{
 303        unsigned char sha1[20];
 304        char *url;
 305        struct buffer buffer;
 306        char *data;
 307        int i = 0;
 308
 309        if (repo->got_indices)
 310                return 0;
 311
 312        data = xmalloc(4096);
 313        buffer.size = 4096;
 314        buffer.posn = 0;
 315        buffer.buffer = data;
 316
 317        if (get_verbosely)
 318                fprintf(stderr, "Getting pack list\n");
 319        
 320        url = xmalloc(strlen(repo->base) + 21);
 321        sprintf(url, "%s/objects/info/packs", repo->base);
 322
 323        curl_easy_setopt(curl, CURLOPT_FILE, &buffer);
 324        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 325        curl_easy_setopt(curl, CURLOPT_URL, url);
 326        curl_easy_setopt(curl, CURLOPT_HTTPHEADER, NULL);
 327        curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 328        
 329        if (curl_easy_perform(curl))
 330                return error("%s", curl_errorstr);
 331
 332        while (i < buffer.posn) {
 333                switch (data[i]) {
 334                case 'P':
 335                        i++;
 336                        if (i + 52 < buffer.posn &&
 337                            !strncmp(data + i, " pack-", 6) &&
 338                            !strncmp(data + i + 46, ".pack\n", 6)) {
 339                                get_sha1_hex(data + i + 6, sha1);
 340                                setup_index(repo, sha1);
 341                                i += 51;
 342                                break;
 343                        }
 344                default:
 345                        while (data[i] != '\n')
 346                                i++;
 347                }
 348                i++;
 349        }
 350
 351        repo->got_indices = 1;
 352        return 0;
 353}
 354
 355static int fetch_pack(struct alt_base *repo, unsigned char *sha1)
 356{
 357        char *url;
 358        struct packed_git *target;
 359        struct packed_git **lst;
 360        FILE *packfile;
 361        char *filename;
 362        char tmpfile[PATH_MAX];
 363        int ret;
 364        long prev_posn = 0;
 365        char range[RANGE_HEADER_SIZE];
 366        struct curl_slist *range_header = NULL;
 367        CURLcode curl_result;
 368
 369        if (fetch_indices(repo))
 370                return -1;
 371        target = find_sha1_pack(sha1, repo->packs);
 372        if (!target)
 373                return -1;
 374
 375        if (get_verbosely) {
 376                fprintf(stderr, "Getting pack %s\n",
 377                        sha1_to_hex(target->sha1));
 378                fprintf(stderr, " which contains %s\n",
 379                        sha1_to_hex(sha1));
 380        }
 381
 382        url = xmalloc(strlen(repo->base) + 65);
 383        sprintf(url, "%s/objects/pack/pack-%s.pack",
 384                repo->base, sha1_to_hex(target->sha1));
 385
 386        filename = sha1_pack_name(target->sha1);
 387        snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename);
 388        packfile = fopen(tmpfile, "a");
 389        if (!packfile)
 390                return error("Unable to open local file %s for pack",
 391                             filename);
 392
 393        curl_easy_setopt(curl, CURLOPT_FILE, packfile);
 394        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite);
 395        curl_easy_setopt(curl, CURLOPT_URL, url);
 396        curl_easy_setopt(curl, CURLOPT_HTTPHEADER, no_pragma_header);
 397        curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 398
 399        /* If there is data present from a previous transfer attempt,
 400           resume where it left off */
 401        prev_posn = ftell(packfile);
 402        if (prev_posn>0) {
 403                if (get_verbosely)
 404                        fprintf(stderr,
 405                                "Resuming fetch of pack %s at byte %ld\n",
 406                                sha1_to_hex(target->sha1), prev_posn);
 407                sprintf(range, "Range: bytes=%ld-", prev_posn);
 408                range_header = curl_slist_append(range_header, range);
 409                curl_easy_setopt(curl, CURLOPT_HTTPHEADER, range_header);
 410        }
 411
 412        /* Clear out the Range: header after performing the request, so
 413           other curl requests don't inherit inappropriate header data */
 414        curl_result = curl_easy_perform(curl);
 415        curl_easy_setopt(curl, CURLOPT_HTTPHEADER, no_range_header);
 416        if (curl_result != 0) {
 417                fclose(packfile);
 418                return error("Unable to get pack file %s\n%s", url,
 419                             curl_errorstr);
 420        }
 421
 422        fclose(packfile);
 423
 424        ret = relink_or_rename(tmpfile, filename);
 425        if (ret)
 426                return error("unable to write pack filename %s: %s",
 427                             filename, strerror(ret));
 428
 429        lst = &repo->packs;
 430        while (*lst != target)
 431                lst = &((*lst)->next);
 432        *lst = (*lst)->next;
 433
 434        if (verify_pack(target, 0))
 435                return -1;
 436        install_packed_git(target);
 437
 438        return 0;
 439}
 440
 441static int fetch_object(struct alt_base *repo, unsigned char *sha1)
 442{
 443        char *hex = sha1_to_hex(sha1);
 444        char *filename = sha1_file_name(sha1);
 445        unsigned char real_sha1[20];
 446        char tmpfile[PATH_MAX];
 447        char prevfile[PATH_MAX];
 448        int ret;
 449        char *url;
 450        char *posn;
 451        int prevlocal;
 452        unsigned char prev_buf[PREV_BUF_SIZE];
 453        ssize_t prev_read = 0;
 454        long prev_posn = 0;
 455        char range[RANGE_HEADER_SIZE];
 456        struct curl_slist *range_header = NULL;
 457        CURLcode curl_result;
 458
 459        snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename);
 460        snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
 461
 462        if (unlink(prevfile) && (errno != ENOENT))
 463                return error("Failed to unlink %s (%s)",
 464                             prevfile, strerror(errno));
 465        if (rename(tmpfile, prevfile) && (errno != ENOENT))
 466                return error("Failed to rename %s to %s (%s)",
 467                             tmpfile, prevfile, strerror(errno));
 468
 469        local = open(tmpfile, O_WRONLY | O_CREAT | O_EXCL, 0666);
 470
 471        /* Note: if another instance starts now, it will turn our new
 472           tmpfile into its prevfile. */
 473
 474        if (local < 0)
 475                return error("Couldn't create temporary file %s for %s: %s\n",
 476                             tmpfile, filename, strerror(errno));
 477
 478        memset(&stream, 0, sizeof(stream));
 479
 480        inflateInit(&stream);
 481
 482        SHA1_Init(&c);
 483
 484        curl_easy_setopt(curl, CURLOPT_FAILONERROR, 1);
 485        curl_easy_setopt(curl, CURLOPT_FILE, NULL);
 486        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
 487        curl_easy_setopt(curl, CURLOPT_HTTPHEADER, no_pragma_header);
 488        curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 489
 490        url = xmalloc(strlen(repo->base) + 50);
 491        strcpy(url, repo->base);
 492        posn = url + strlen(repo->base);
 493        strcpy(posn, "objects/");
 494        posn += 8;
 495        memcpy(posn, hex, 2);
 496        posn += 2;
 497        *(posn++) = '/';
 498        strcpy(posn, hex + 2);
 499
 500        curl_easy_setopt(curl, CURLOPT_URL, url);
 501
 502        /* If a previous temp file is present, process what was already
 503           fetched. */
 504        prevlocal = open(prevfile, O_RDONLY);
 505        if (prevlocal != -1) {
 506                do {
 507                        prev_read = read(prevlocal, prev_buf, PREV_BUF_SIZE);
 508                        if (prev_read>0) {
 509                                if (fwrite_sha1_file(prev_buf,
 510                                                     1,
 511                                                     prev_read,
 512                                                     NULL) == prev_read) {
 513                                        prev_posn += prev_read;
 514                                } else {
 515                                        prev_read = -1;
 516                                }
 517                        }
 518                } while (prev_read > 0);
 519                close(prevlocal);
 520        }
 521        unlink(prevfile);
 522
 523        /* Reset inflate/SHA1 if there was an error reading the previous temp
 524           file; also rewind to the beginning of the local file. */
 525        if (prev_read == -1) {
 526                memset(&stream, 0, sizeof(stream));
 527                inflateInit(&stream);
 528                SHA1_Init(&c);
 529                if (prev_posn>0) {
 530                        prev_posn = 0;
 531                        lseek(local, SEEK_SET, 0);
 532                        ftruncate(local, 0);
 533                }
 534        }
 535
 536        /* If we have successfully processed data from a previous fetch
 537           attempt, only fetch the data we don't already have. */
 538        if (prev_posn>0) {
 539                if (get_verbosely)
 540                        fprintf(stderr,
 541                                "Resuming fetch of object %s at byte %ld\n",
 542                                hex, prev_posn);
 543                sprintf(range, "Range: bytes=%ld-", prev_posn);
 544                range_header = curl_slist_append(range_header, range);
 545                curl_easy_setopt(curl, CURLOPT_HTTPHEADER, range_header);
 546        }
 547
 548        /* Clear out the Range: header after performing the request, so
 549           other curl requests don't inherit inappropriate header data */
 550        curl_result = curl_easy_perform(curl);
 551        curl_easy_setopt(curl, CURLOPT_HTTPHEADER, no_range_header);
 552        if (curl_result != 0) {
 553                return error("%s", curl_errorstr);
 554        }
 555
 556        fchmod(local, 0444);
 557        close(local);
 558        inflateEnd(&stream);
 559        SHA1_Final(real_sha1, &c);
 560        if (zret != Z_STREAM_END) {
 561                unlink(tmpfile);
 562                return error("File %s (%s) corrupt\n", hex, url);
 563        }
 564        if (memcmp(sha1, real_sha1, 20)) {
 565                unlink(tmpfile);
 566                return error("File %s has bad hash\n", hex);
 567        }
 568        ret = relink_or_rename(tmpfile, filename);
 569        if (ret)
 570                return error("unable to write sha1 filename %s: %s",
 571                             filename, strerror(ret));
 572
 573        pull_say("got %s\n", hex);
 574        return 0;
 575}
 576
 577int fetch(unsigned char *sha1)
 578{
 579        struct alt_base *altbase = alt;
 580        while (altbase) {
 581                if (!fetch_object(altbase, sha1))
 582                        return 0;
 583                if (!fetch_pack(altbase, sha1))
 584                        return 0;
 585                if (fetch_alternates(altbase->base) > 0) {
 586                        altbase = alt;
 587                        continue;
 588                }
 589                altbase = altbase->next;
 590        }
 591        return error("Unable to find %s under %s\n", sha1_to_hex(sha1), 
 592                     initial_base);
 593}
 594
 595int fetch_ref(char *ref, unsigned char *sha1)
 596{
 597        char *url, *posn;
 598        char hex[42];
 599        struct buffer buffer;
 600        char *base = initial_base;
 601        buffer.size = 41;
 602        buffer.posn = 0;
 603        buffer.buffer = hex;
 604        hex[41] = '\0';
 605        
 606        curl_easy_setopt(curl, CURLOPT_FILE, &buffer);
 607        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 608        curl_easy_setopt(curl, CURLOPT_HTTPHEADER, NULL);
 609        curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 610
 611        url = xmalloc(strlen(base) + 6 + strlen(ref));
 612        strcpy(url, base);
 613        posn = url + strlen(base);
 614        strcpy(posn, "refs/");
 615        posn += 5;
 616        strcpy(posn, ref);
 617
 618        curl_easy_setopt(curl, CURLOPT_URL, url);
 619
 620        if (curl_easy_perform(curl))
 621                return error("Couldn't get %s for %s\n%s",
 622                             url, ref, curl_errorstr);
 623
 624        hex[40] = '\0';
 625        get_sha1_hex(hex, sha1);
 626        return 0;
 627}
 628
 629int main(int argc, char **argv)
 630{
 631        char *commit_id;
 632        char *url;
 633        int arg = 1;
 634
 635        while (arg < argc && argv[arg][0] == '-') {
 636                if (argv[arg][1] == 't') {
 637                        get_tree = 1;
 638                } else if (argv[arg][1] == 'c') {
 639                        get_history = 1;
 640                } else if (argv[arg][1] == 'a') {
 641                        get_all = 1;
 642                        get_tree = 1;
 643                        get_history = 1;
 644                } else if (argv[arg][1] == 'v') {
 645                        get_verbosely = 1;
 646                } else if (argv[arg][1] == 'w') {
 647                        write_ref = argv[arg + 1];
 648                        arg++;
 649                } else if (!strcmp(argv[arg], "--recover")) {
 650                        get_recover = 1;
 651                }
 652                arg++;
 653        }
 654        if (argc < arg + 2) {
 655                usage("git-http-fetch [-c] [-t] [-a] [-d] [-v] [--recover] [-w ref] commit-id url");
 656                return 1;
 657        }
 658        commit_id = argv[arg];
 659        url = argv[arg + 1];
 660
 661        curl_global_init(CURL_GLOBAL_ALL);
 662
 663        curl = curl_easy_init();
 664        no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
 665        no_range_header = curl_slist_append(no_range_header, "Range:");
 666
 667        curl_ssl_verify = getenv("GIT_SSL_NO_VERIFY") ? 0 : 1;
 668        curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, curl_ssl_verify);
 669#if LIBCURL_VERSION_NUM >= 0x070907
 670        curl_easy_setopt(curl, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 671#endif
 672
 673        if ((ssl_cert = getenv("GIT_SSL_CERT")) != NULL) {
 674                curl_easy_setopt(curl, CURLOPT_SSLCERT, ssl_cert);
 675        }
 676#if LIBCURL_VERSION_NUM >= 0x070902
 677        if ((ssl_key = getenv("GIT_SSL_KEY")) != NULL) {
 678                curl_easy_setopt(curl, CURLOPT_SSLKEY, ssl_key);
 679        }
 680#endif
 681#if LIBCURL_VERSION_NUM >= 0x070908
 682        if ((ssl_capath = getenv("GIT_SSL_CAPATH")) != NULL) {
 683                curl_easy_setopt(curl, CURLOPT_CAPATH, ssl_capath);
 684        }
 685#endif
 686        if ((ssl_cainfo = getenv("GIT_SSL_CAINFO")) != NULL) {
 687                curl_easy_setopt(curl, CURLOPT_CAINFO, ssl_cainfo);
 688        }
 689
 690        alt = xmalloc(sizeof(*alt));
 691        alt->base = url;
 692        alt->got_indices = 0;
 693        alt->packs = NULL;
 694        alt->next = NULL;
 695        initial_base = url;
 696
 697        if (pull(commit_id))
 698                return 1;
 699
 700        curl_slist_free_all(no_pragma_header);
 701        curl_global_cleanup();
 702        return 0;
 703}