Andrew's git / gitweb.git / remote-curl.c
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remote-curl.con commit Documentation/submodule: add command references and update options (402e8a6)
   1#include "cache.h"
   2#include "remote.h"
   3#include "strbuf.h"
   4#include "walker.h"
   5#include "http.h"
   6#include "exec_cmd.h"
   7#include "run-command.h"
   8#include "pkt-line.h"
   9#include "sideband.h"
  10
  11static struct remote *remote;
  12static const char *url; /* always ends with a trailing slash */
  13
  14struct options {
  15        int verbosity;
  16        unsigned long depth;
  17        unsigned progress : 1,
  18                followtags : 1,
  19                dry_run : 1,
  20                thin : 1;
  21};
  22static struct options options;
  23
  24static int set_option(const char *name, const char *value)
  25{
  26        if (!strcmp(name, "verbosity")) {
  27                char *end;
  28                int v = strtol(value, &end, 10);
  29                if (value == end || *end)
  30                        return -1;
  31                options.verbosity = v;
  32                return 0;
  33        }
  34        else if (!strcmp(name, "progress")) {
  35                if (!strcmp(value, "true"))
  36                        options.progress = 1;
  37                else if (!strcmp(value, "false"))
  38                        options.progress = 0;
  39                else
  40                        return -1;
  41                return 0;
  42        }
  43        else if (!strcmp(name, "depth")) {
  44                char *end;
  45                unsigned long v = strtoul(value, &end, 10);
  46                if (value == end || *end)
  47                        return -1;
  48                options.depth = v;
  49                return 0;
  50        }
  51        else if (!strcmp(name, "followtags")) {
  52                if (!strcmp(value, "true"))
  53                        options.followtags = 1;
  54                else if (!strcmp(value, "false"))
  55                        options.followtags = 0;
  56                else
  57                        return -1;
  58                return 0;
  59        }
  60        else if (!strcmp(name, "dry-run")) {
  61                if (!strcmp(value, "true"))
  62                        options.dry_run = 1;
  63                else if (!strcmp(value, "false"))
  64                        options.dry_run = 0;
  65                else
  66                        return -1;
  67                return 0;
  68        }
  69        else {
  70                return 1 /* unsupported */;
  71        }
  72}
  73
  74struct discovery {
  75        const char *service;
  76        char *buf_alloc;
  77        char *buf;
  78        size_t len;
  79        unsigned proto_git : 1;
  80};
  81static struct discovery *last_discovery;
  82
  83static void free_discovery(struct discovery *d)
  84{
  85        if (d) {
  86                if (d == last_discovery)
  87                        last_discovery = NULL;
  88                free(d->buf_alloc);
  89                free(d);
  90        }
  91}
  92
  93static struct discovery* discover_refs(const char *service)
  94{
  95        struct strbuf buffer = STRBUF_INIT;
  96        struct discovery *last = last_discovery;
  97        char *refs_url;
  98        int http_ret, is_http = 0, proto_git_candidate = 1;
  99
 100        if (last && !strcmp(service, last->service))
 101                return last;
 102        free_discovery(last);
 103
 104        strbuf_addf(&buffer, "%sinfo/refs", url);
 105        if (!prefixcmp(url, "http://") || !prefixcmp(url, "https://")) {
 106                is_http = 1;
 107                if (!strchr(url, '?'))
 108                        strbuf_addch(&buffer, '?');
 109                else
 110                        strbuf_addch(&buffer, '&');
 111                strbuf_addf(&buffer, "service=%s", service);
 112        }
 113        refs_url = strbuf_detach(&buffer, NULL);
 114
 115        http_ret = http_get_strbuf(refs_url, &buffer, HTTP_NO_CACHE);
 116
 117        /* try again with "plain" url (no ? or & appended) */
 118        if (http_ret != HTTP_OK) {
 119                free(refs_url);
 120                strbuf_reset(&buffer);
 121
 122                proto_git_candidate = 0;
 123                strbuf_addf(&buffer, "%sinfo/refs", url);
 124                refs_url = strbuf_detach(&buffer, NULL);
 125
 126                http_ret = http_get_strbuf(refs_url, &buffer, HTTP_NO_CACHE);
 127        }
 128
 129        switch (http_ret) {
 130        case HTTP_OK:
 131                break;
 132        case HTTP_MISSING_TARGET:
 133                die("%s not found: did you run git update-server-info on the"
 134                    " server?", refs_url);
 135        case HTTP_NOAUTH:
 136                die("Authentication failed");
 137        default:
 138                http_error(refs_url, http_ret);
 139                die("HTTP request failed");
 140        }
 141
 142        last= xcalloc(1, sizeof(*last_discovery));
 143        last->service = service;
 144        last->buf_alloc = strbuf_detach(&buffer, &last->len);
 145        last->buf = last->buf_alloc;
 146
 147        if (is_http && proto_git_candidate
 148                && 5 <= last->len && last->buf[4] == '#') {
 149                /* smart HTTP response; validate that the service
 150                 * pkt-line matches our request.
 151                 */
 152                struct strbuf exp = STRBUF_INIT;
 153
 154                if (packet_get_line(&buffer, &last->buf, &last->len) <= 0)
 155                        die("%s has invalid packet header", refs_url);
 156                if (buffer.len && buffer.buf[buffer.len - 1] == '\n')
 157                        strbuf_setlen(&buffer, buffer.len - 1);
 158
 159                strbuf_addf(&exp, "# service=%s", service);
 160                if (strbuf_cmp(&exp, &buffer))
 161                        die("invalid server response; got '%s'", buffer.buf);
 162                strbuf_release(&exp);
 163
 164                /* The header can include additional metadata lines, up
 165                 * until a packet flush marker.  Ignore these now, but
 166                 * in the future we might start to scan them.
 167                 */
 168                strbuf_reset(&buffer);
 169                while (packet_get_line(&buffer, &last->buf, &last->len) > 0)
 170                        strbuf_reset(&buffer);
 171
 172                last->proto_git = 1;
 173        }
 174
 175        free(refs_url);
 176        strbuf_release(&buffer);
 177        last_discovery = last;
 178        return last;
 179}
 180
 181static int write_discovery(int in, int out, void *data)
 182{
 183        struct discovery *heads = data;
 184        int err = 0;
 185        if (write_in_full(out, heads->buf, heads->len) != heads->len)
 186                err = 1;
 187        close(out);
 188        return err;
 189}
 190
 191static struct ref *parse_git_refs(struct discovery *heads)
 192{
 193        struct ref *list = NULL;
 194        struct async async;
 195
 196        memset(&async, 0, sizeof(async));
 197        async.proc = write_discovery;
 198        async.data = heads;
 199        async.out = -1;
 200
 201        if (start_async(&async))
 202                die("cannot start thread to parse advertised refs");
 203        get_remote_heads(async.out, &list, 0, NULL, 0, NULL);
 204        close(async.out);
 205        if (finish_async(&async))
 206                die("ref parsing thread failed");
 207        return list;
 208}
 209
 210static struct ref *parse_info_refs(struct discovery *heads)
 211{
 212        char *data, *start, *mid;
 213        char *ref_name;
 214        int i = 0;
 215
 216        struct ref *refs = NULL;
 217        struct ref *ref = NULL;
 218        struct ref *last_ref = NULL;
 219
 220        data = heads->buf;
 221        start = NULL;
 222        mid = data;
 223        while (i < heads->len) {
 224                if (!start) {
 225                        start = &data[i];
 226                }
 227                if (data[i] == '\t')
 228                        mid = &data[i];
 229                if (data[i] == '\n') {
 230                        if (mid - start != 40)
 231                                die("%sinfo/refs not valid: is this a git repository?", url);
 232                        data[i] = 0;
 233                        ref_name = mid + 1;
 234                        ref = xmalloc(sizeof(struct ref) +
 235                                      strlen(ref_name) + 1);
 236                        memset(ref, 0, sizeof(struct ref));
 237                        strcpy(ref->name, ref_name);
 238                        get_sha1_hex(start, ref->old_sha1);
 239                        if (!refs)
 240                                refs = ref;
 241                        if (last_ref)
 242                                last_ref->next = ref;
 243                        last_ref = ref;
 244                        start = NULL;
 245                }
 246                i++;
 247        }
 248
 249        ref = alloc_ref("HEAD");
 250        if (!http_fetch_ref(url, ref) &&
 251            !resolve_remote_symref(ref, refs)) {
 252                ref->next = refs;
 253                refs = ref;
 254        } else {
 255                free(ref);
 256        }
 257
 258        return refs;
 259}
 260
 261static struct ref *get_refs(int for_push)
 262{
 263        struct discovery *heads;
 264
 265        if (for_push)
 266                heads = discover_refs("git-receive-pack");
 267        else
 268                heads = discover_refs("git-upload-pack");
 269
 270        if (heads->proto_git)
 271                return parse_git_refs(heads);
 272        return parse_info_refs(heads);
 273}
 274
 275static void output_refs(struct ref *refs)
 276{
 277        struct ref *posn;
 278        for (posn = refs; posn; posn = posn->next) {
 279                if (posn->symref)
 280                        printf("@%s %s\n", posn->symref, posn->name);
 281                else
 282                        printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
 283        }
 284        printf("\n");
 285        fflush(stdout);
 286        free_refs(refs);
 287}
 288
 289struct rpc_state {
 290        const char *service_name;
 291        const char **argv;
 292        char *service_url;
 293        char *hdr_content_type;
 294        char *hdr_accept;
 295        char *buf;
 296        size_t alloc;
 297        size_t len;
 298        size_t pos;
 299        int in;
 300        int out;
 301        struct strbuf result;
 302        unsigned gzip_request : 1;
 303        unsigned initial_buffer : 1;
 304};
 305
 306static size_t rpc_out(void *ptr, size_t eltsize,
 307                size_t nmemb, void *buffer_)
 308{
 309        size_t max = eltsize * nmemb;
 310        struct rpc_state *rpc = buffer_;
 311        size_t avail = rpc->len - rpc->pos;
 312
 313        if (!avail) {
 314                rpc->initial_buffer = 0;
 315                avail = packet_read_line(rpc->out, rpc->buf, rpc->alloc);
 316                if (!avail)
 317                        return 0;
 318                rpc->pos = 0;
 319                rpc->len = avail;
 320        }
 321
 322        if (max < avail)
 323                avail = max;
 324        memcpy(ptr, rpc->buf + rpc->pos, avail);
 325        rpc->pos += avail;
 326        return avail;
 327}
 328
 329#ifndef NO_CURL_IOCTL
 330static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 331{
 332        struct rpc_state *rpc = clientp;
 333
 334        switch (cmd) {
 335        case CURLIOCMD_NOP:
 336                return CURLIOE_OK;
 337
 338        case CURLIOCMD_RESTARTREAD:
 339                if (rpc->initial_buffer) {
 340                        rpc->pos = 0;
 341                        return CURLIOE_OK;
 342                }
 343                fprintf(stderr, "Unable to rewind rpc post data - try increasing http.postBuffer\n");
 344                return CURLIOE_FAILRESTART;
 345
 346        default:
 347                return CURLIOE_UNKNOWNCMD;
 348        }
 349}
 350#endif
 351
 352static size_t rpc_in(char *ptr, size_t eltsize,
 353                size_t nmemb, void *buffer_)
 354{
 355        size_t size = eltsize * nmemb;
 356        struct rpc_state *rpc = buffer_;
 357        write_or_die(rpc->in, ptr, size);
 358        return size;
 359}
 360
 361static int run_slot(struct active_request_slot *slot)
 362{
 363        int err = 0;
 364        struct slot_results results;
 365
 366        slot->results = &results;
 367        slot->curl_result = curl_easy_perform(slot->curl);
 368        finish_active_slot(slot);
 369
 370        if (results.curl_result != CURLE_OK) {
 371                err |= error("RPC failed; result=%d, HTTP code = %ld",
 372                        results.curl_result, results.http_code);
 373        }
 374
 375        return err;
 376}
 377
 378static int probe_rpc(struct rpc_state *rpc)
 379{
 380        struct active_request_slot *slot;
 381        struct curl_slist *headers = NULL;
 382        struct strbuf buf = STRBUF_INIT;
 383        int err;
 384
 385        slot = get_active_slot();
 386
 387        headers = curl_slist_append(headers, rpc->hdr_content_type);
 388        headers = curl_slist_append(headers, rpc->hdr_accept);
 389
 390        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 391        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 392        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 393        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
 394        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 395        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 396        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 397        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 398        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 399
 400        err = run_slot(slot);
 401
 402        curl_slist_free_all(headers);
 403        strbuf_release(&buf);
 404        return err;
 405}
 406
 407static int post_rpc(struct rpc_state *rpc)
 408{
 409        struct active_request_slot *slot;
 410        struct curl_slist *headers = NULL;
 411        int use_gzip = rpc->gzip_request;
 412        char *gzip_body = NULL;
 413        int err, large_request = 0;
 414
 415        /* Try to load the entire request, if we can fit it into the
 416         * allocated buffer space we can use HTTP/1.0 and avoid the
 417         * chunked encoding mess.
 418         */
 419        while (1) {
 420                size_t left = rpc->alloc - rpc->len;
 421                char *buf = rpc->buf + rpc->len;
 422                int n;
 423
 424                if (left < LARGE_PACKET_MAX) {
 425                        large_request = 1;
 426                        use_gzip = 0;
 427                        break;
 428                }
 429
 430                n = packet_read_line(rpc->out, buf, left);
 431                if (!n)
 432                        break;
 433                rpc->len += n;
 434        }
 435
 436        if (large_request) {
 437                err = probe_rpc(rpc);
 438                if (err)
 439                        return err;
 440        }
 441
 442        slot = get_active_slot();
 443
 444        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 445        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 446        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 447        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
 448
 449        headers = curl_slist_append(headers, rpc->hdr_content_type);
 450        headers = curl_slist_append(headers, rpc->hdr_accept);
 451        headers = curl_slist_append(headers, "Expect:");
 452
 453        if (large_request) {
 454                /* The request body is large and the size cannot be predicted.
 455                 * We must use chunked encoding to send it.
 456                 */
 457                headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 458                rpc->initial_buffer = 1;
 459                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 460                curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 461#ifndef NO_CURL_IOCTL
 462                curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 463                curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 464#endif
 465                if (options.verbosity > 1) {
 466                        fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 467                        fflush(stderr);
 468                }
 469
 470        } else if (use_gzip && 1024 < rpc->len) {
 471                /* The client backend isn't giving us compressed data so
 472                 * we can try to deflate it ourselves, this may save on.
 473                 * the transfer time.
 474                 */
 475                size_t size;
 476                z_stream stream;
 477                int ret;
 478
 479                memset(&stream, 0, sizeof(stream));
 480                ret = deflateInit2(&stream, Z_BEST_COMPRESSION,
 481                                Z_DEFLATED, (15 + 16),
 482                                8, Z_DEFAULT_STRATEGY);
 483                if (ret != Z_OK)
 484                        die("cannot deflate request; zlib init error %d", ret);
 485                size = deflateBound(&stream, rpc->len);
 486                gzip_body = xmalloc(size);
 487
 488                stream.next_in = (unsigned char *)rpc->buf;
 489                stream.avail_in = rpc->len;
 490                stream.next_out = (unsigned char *)gzip_body;
 491                stream.avail_out = size;
 492
 493                ret = deflate(&stream, Z_FINISH);
 494                if (ret != Z_STREAM_END)
 495                        die("cannot deflate request; zlib deflate error %d", ret);
 496
 497                ret = deflateEnd(&stream);
 498                if (ret != Z_OK)
 499                        die("cannot deflate request; zlib end error %d", ret);
 500
 501                size = stream.total_out;
 502
 503                headers = curl_slist_append(headers, "Content-Encoding: gzip");
 504                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 505                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, size);
 506
 507                if (options.verbosity > 1) {
 508                        fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 509                                rpc->service_name,
 510                                (unsigned long)rpc->len, (unsigned long)size);
 511                        fflush(stderr);
 512                }
 513        } else {
 514                /* We know the complete request size in advance, use the
 515                 * more normal Content-Length approach.
 516                 */
 517                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 518                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 519                if (options.verbosity > 1) {
 520                        fprintf(stderr, "POST %s (%lu bytes)\n",
 521                                rpc->service_name, (unsigned long)rpc->len);
 522                        fflush(stderr);
 523                }
 524        }
 525
 526        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 527        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 528        curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 529
 530        err = run_slot(slot);
 531
 532        curl_slist_free_all(headers);
 533        free(gzip_body);
 534        return err;
 535}
 536
 537static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 538{
 539        const char *svc = rpc->service_name;
 540        struct strbuf buf = STRBUF_INIT;
 541        struct child_process client;
 542        int err = 0;
 543
 544        memset(&client, 0, sizeof(client));
 545        client.in = -1;
 546        client.out = -1;
 547        client.git_cmd = 1;
 548        client.argv = rpc->argv;
 549        if (start_command(&client))
 550                exit(1);
 551        if (heads)
 552                write_or_die(client.in, heads->buf, heads->len);
 553
 554        rpc->alloc = http_post_buffer;
 555        rpc->buf = xmalloc(rpc->alloc);
 556        rpc->in = client.in;
 557        rpc->out = client.out;
 558        strbuf_init(&rpc->result, 0);
 559
 560        strbuf_addf(&buf, "%s%s", url, svc);
 561        rpc->service_url = strbuf_detach(&buf, NULL);
 562
 563        strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 564        rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 565
 566        strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 567        rpc->hdr_accept = strbuf_detach(&buf, NULL);
 568
 569        while (!err) {
 570                int n = packet_read_line(rpc->out, rpc->buf, rpc->alloc);
 571                if (!n)
 572                        break;
 573                rpc->pos = 0;
 574                rpc->len = n;
 575                err |= post_rpc(rpc);
 576        }
 577
 578        close(client.in);
 579        client.in = -1;
 580        strbuf_read(&rpc->result, client.out, 0);
 581
 582        close(client.out);
 583        client.out = -1;
 584
 585        err |= finish_command(&client);
 586        free(rpc->service_url);
 587        free(rpc->hdr_content_type);
 588        free(rpc->hdr_accept);
 589        free(rpc->buf);
 590        strbuf_release(&buf);
 591        return err;
 592}
 593
 594static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 595{
 596        struct walker *walker;
 597        char **targets = xmalloc(nr_heads * sizeof(char*));
 598        int ret, i;
 599
 600        if (options.depth)
 601                die("dumb http transport does not support --depth");
 602        for (i = 0; i < nr_heads; i++)
 603                targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 604
 605        walker = get_http_walker(url);
 606        walker->get_all = 1;
 607        walker->get_tree = 1;
 608        walker->get_history = 1;
 609        walker->get_verbosely = options.verbosity >= 3;
 610        walker->get_recover = 0;
 611        ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 612        walker_free(walker);
 613
 614        for (i = 0; i < nr_heads; i++)
 615                free(targets[i]);
 616        free(targets);
 617
 618        return ret ? error("Fetch failed.") : 0;
 619}
 620
 621static int fetch_git(struct discovery *heads,
 622        int nr_heads, struct ref **to_fetch)
 623{
 624        struct rpc_state rpc;
 625        char *depth_arg = NULL;
 626        const char **argv;
 627        int argc = 0, i, err;
 628
 629        argv = xmalloc((15 + nr_heads) * sizeof(char*));
 630        argv[argc++] = "fetch-pack";
 631        argv[argc++] = "--stateless-rpc";
 632        argv[argc++] = "--lock-pack";
 633        if (options.followtags)
 634                argv[argc++] = "--include-tag";
 635        if (options.thin)
 636                argv[argc++] = "--thin";
 637        if (options.verbosity >= 3) {
 638                argv[argc++] = "-v";
 639                argv[argc++] = "-v";
 640        }
 641        if (!options.progress)
 642                argv[argc++] = "--no-progress";
 643        if (options.depth) {
 644                struct strbuf buf = STRBUF_INIT;
 645                strbuf_addf(&buf, "--depth=%lu", options.depth);
 646                depth_arg = strbuf_detach(&buf, NULL);
 647                argv[argc++] = depth_arg;
 648        }
 649        argv[argc++] = url;
 650        for (i = 0; i < nr_heads; i++) {
 651                struct ref *ref = to_fetch[i];
 652                if (!ref->name || !*ref->name)
 653                        die("cannot fetch by sha1 over smart http");
 654                argv[argc++] = ref->name;
 655        }
 656        argv[argc++] = NULL;
 657
 658        memset(&rpc, 0, sizeof(rpc));
 659        rpc.service_name = "git-upload-pack",
 660        rpc.argv = argv;
 661        rpc.gzip_request = 1;
 662
 663        err = rpc_service(&rpc, heads);
 664        if (rpc.result.len)
 665                safe_write(1, rpc.result.buf, rpc.result.len);
 666        strbuf_release(&rpc.result);
 667        free(argv);
 668        free(depth_arg);
 669        return err;
 670}
 671
 672static int fetch(int nr_heads, struct ref **to_fetch)
 673{
 674        struct discovery *d = discover_refs("git-upload-pack");
 675        if (d->proto_git)
 676                return fetch_git(d, nr_heads, to_fetch);
 677        else
 678                return fetch_dumb(nr_heads, to_fetch);
 679}
 680
 681static void parse_fetch(struct strbuf *buf)
 682{
 683        struct ref **to_fetch = NULL;
 684        struct ref *list_head = NULL;
 685        struct ref **list = &list_head;
 686        int alloc_heads = 0, nr_heads = 0;
 687
 688        do {
 689                if (!prefixcmp(buf->buf, "fetch ")) {
 690                        char *p = buf->buf + strlen("fetch ");
 691                        char *name;
 692                        struct ref *ref;
 693                        unsigned char old_sha1[20];
 694
 695                        if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 696                                die("protocol error: expected sha/ref, got %s'", p);
 697                        if (p[40] == ' ')
 698                                name = p + 41;
 699                        else if (!p[40])
 700                                name = "";
 701                        else
 702                                die("protocol error: expected sha/ref, got %s'", p);
 703
 704                        ref = alloc_ref(name);
 705                        hashcpy(ref->old_sha1, old_sha1);
 706
 707                        *list = ref;
 708                        list = &ref->next;
 709
 710                        ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 711                        to_fetch[nr_heads++] = ref;
 712                }
 713                else
 714                        die("http transport does not support %s", buf->buf);
 715
 716                strbuf_reset(buf);
 717                if (strbuf_getline(buf, stdin, '\n') == EOF)
 718                        return;
 719                if (!*buf->buf)
 720                        break;
 721        } while (1);
 722
 723        if (fetch(nr_heads, to_fetch))
 724                exit(128); /* error already reported */
 725        free_refs(list_head);
 726        free(to_fetch);
 727
 728        printf("\n");
 729        fflush(stdout);
 730        strbuf_reset(buf);
 731}
 732
 733static int push_dav(int nr_spec, char **specs)
 734{
 735        const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 736        int argc = 0, i;
 737
 738        argv[argc++] = "http-push";
 739        argv[argc++] = "--helper-status";
 740        if (options.dry_run)
 741                argv[argc++] = "--dry-run";
 742        if (options.verbosity > 1)
 743                argv[argc++] = "--verbose";
 744        argv[argc++] = url;
 745        for (i = 0; i < nr_spec; i++)
 746                argv[argc++] = specs[i];
 747        argv[argc++] = NULL;
 748
 749        if (run_command_v_opt(argv, RUN_GIT_CMD))
 750                die("git-%s failed", argv[0]);
 751        free(argv);
 752        return 0;
 753}
 754
 755static int push_git(struct discovery *heads, int nr_spec, char **specs)
 756{
 757        struct rpc_state rpc;
 758        const char **argv;
 759        int argc = 0, i, err;
 760
 761        argv = xmalloc((10 + nr_spec) * sizeof(char*));
 762        argv[argc++] = "send-pack";
 763        argv[argc++] = "--stateless-rpc";
 764        argv[argc++] = "--helper-status";
 765        if (options.thin)
 766                argv[argc++] = "--thin";
 767        if (options.dry_run)
 768                argv[argc++] = "--dry-run";
 769        if (options.verbosity > 1)
 770                argv[argc++] = "--verbose";
 771        argv[argc++] = url;
 772        for (i = 0; i < nr_spec; i++)
 773                argv[argc++] = specs[i];
 774        argv[argc++] = NULL;
 775
 776        memset(&rpc, 0, sizeof(rpc));
 777        rpc.service_name = "git-receive-pack",
 778        rpc.argv = argv;
 779
 780        err = rpc_service(&rpc, heads);
 781        if (rpc.result.len)
 782                safe_write(1, rpc.result.buf, rpc.result.len);
 783        strbuf_release(&rpc.result);
 784        free(argv);
 785        return err;
 786}
 787
 788static int push(int nr_spec, char **specs)
 789{
 790        struct discovery *heads = discover_refs("git-receive-pack");
 791        int ret;
 792
 793        if (heads->proto_git)
 794                ret = push_git(heads, nr_spec, specs);
 795        else
 796                ret = push_dav(nr_spec, specs);
 797        free_discovery(heads);
 798        return ret;
 799}
 800
 801static void parse_push(struct strbuf *buf)
 802{
 803        char **specs = NULL;
 804        int alloc_spec = 0, nr_spec = 0, i;
 805
 806        do {
 807                if (!prefixcmp(buf->buf, "push ")) {
 808                        ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 809                        specs[nr_spec++] = xstrdup(buf->buf + 5);
 810                }
 811                else
 812                        die("http transport does not support %s", buf->buf);
 813
 814                strbuf_reset(buf);
 815                if (strbuf_getline(buf, stdin, '\n') == EOF)
 816                        goto free_specs;
 817                if (!*buf->buf)
 818                        break;
 819        } while (1);
 820
 821        if (push(nr_spec, specs))
 822                exit(128); /* error already reported */
 823
 824        printf("\n");
 825        fflush(stdout);
 826
 827 free_specs:
 828        for (i = 0; i < nr_spec; i++)
 829                free(specs[i]);
 830        free(specs);
 831}
 832
 833int main(int argc, const char **argv)
 834{
 835        struct strbuf buf = STRBUF_INIT;
 836        int nongit;
 837
 838        git_extract_argv0_path(argv[0]);
 839        setup_git_directory_gently(&nongit);
 840        if (argc < 2) {
 841                fprintf(stderr, "Remote needed\n");
 842                return 1;
 843        }
 844
 845        options.verbosity = 1;
 846        options.progress = !!isatty(2);
 847        options.thin = 1;
 848
 849        remote = remote_get(argv[1]);
 850
 851        if (argc > 2) {
 852                end_url_with_slash(&buf, argv[2]);
 853        } else {
 854                end_url_with_slash(&buf, remote->url[0]);
 855        }
 856
 857        url = strbuf_detach(&buf, NULL);
 858
 859        http_init(remote);
 860
 861        do {
 862                if (strbuf_getline(&buf, stdin, '\n') == EOF)
 863                        break;
 864                if (!prefixcmp(buf.buf, "fetch ")) {
 865                        if (nongit)
 866                                die("Fetch attempted without a local repo");
 867                        parse_fetch(&buf);
 868
 869                } else if (!strcmp(buf.buf, "list") || !prefixcmp(buf.buf, "list ")) {
 870                        int for_push = !!strstr(buf.buf + 4, "for-push");
 871                        output_refs(get_refs(for_push));
 872
 873                } else if (!prefixcmp(buf.buf, "push ")) {
 874                        parse_push(&buf);
 875
 876                } else if (!prefixcmp(buf.buf, "option ")) {
 877                        char *name = buf.buf + strlen("option ");
 878                        char *value = strchr(name, ' ');
 879                        int result;
 880
 881                        if (value)
 882                                *value++ = '\0';
 883                        else
 884                                value = "true";
 885
 886                        result = set_option(name, value);
 887                        if (!result)
 888                                printf("ok\n");
 889                        else if (result < 0)
 890                                printf("error invalid value\n");
 891                        else
 892                                printf("unsupported\n");
 893                        fflush(stdout);
 894
 895                } else if (!strcmp(buf.buf, "capabilities")) {
 896                        printf("fetch\n");
 897                        printf("option\n");
 898                        printf("push\n");
 899                        printf("\n");
 900                        fflush(stdout);
 901                } else {
 902                        return 1;
 903                }
 904                strbuf_reset(&buf);
 905        } while (1);
 906
 907        http_cleanup();
 908
 909        return 0;
 910}