Andrew's git / gitweb.git / remote-curl.c
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remote-curl.con commit remote-curl: Fix warning after HTTP failure (6cdf022)
   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                        data[i] = 0;
 231                        ref_name = mid + 1;
 232                        ref = xmalloc(sizeof(struct ref) +
 233                                      strlen(ref_name) + 1);
 234                        memset(ref, 0, sizeof(struct ref));
 235                        strcpy(ref->name, ref_name);
 236                        get_sha1_hex(start, ref->old_sha1);
 237                        if (!refs)
 238                                refs = ref;
 239                        if (last_ref)
 240                                last_ref->next = ref;
 241                        last_ref = ref;
 242                        start = NULL;
 243                }
 244                i++;
 245        }
 246
 247        ref = alloc_ref("HEAD");
 248        if (!http_fetch_ref(url, ref) &&
 249            !resolve_remote_symref(ref, refs)) {
 250                ref->next = refs;
 251                refs = ref;
 252        } else {
 253                free(ref);
 254        }
 255
 256        return refs;
 257}
 258
 259static struct ref *get_refs(int for_push)
 260{
 261        struct discovery *heads;
 262
 263        if (for_push)
 264                heads = discover_refs("git-receive-pack");
 265        else
 266                heads = discover_refs("git-upload-pack");
 267
 268        if (heads->proto_git)
 269                return parse_git_refs(heads);
 270        return parse_info_refs(heads);
 271}
 272
 273static void output_refs(struct ref *refs)
 274{
 275        struct ref *posn;
 276        for (posn = refs; posn; posn = posn->next) {
 277                if (posn->symref)
 278                        printf("@%s %s\n", posn->symref, posn->name);
 279                else
 280                        printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
 281        }
 282        printf("\n");
 283        fflush(stdout);
 284        free_refs(refs);
 285}
 286
 287struct rpc_state {
 288        const char *service_name;
 289        const char **argv;
 290        char *service_url;
 291        char *hdr_content_type;
 292        char *hdr_accept;
 293        char *buf;
 294        size_t alloc;
 295        size_t len;
 296        size_t pos;
 297        int in;
 298        int out;
 299        struct strbuf result;
 300        unsigned gzip_request : 1;
 301        unsigned initial_buffer : 1;
 302};
 303
 304static size_t rpc_out(void *ptr, size_t eltsize,
 305                size_t nmemb, void *buffer_)
 306{
 307        size_t max = eltsize * nmemb;
 308        struct rpc_state *rpc = buffer_;
 309        size_t avail = rpc->len - rpc->pos;
 310
 311        if (!avail) {
 312                rpc->initial_buffer = 0;
 313                avail = packet_read_line(rpc->out, rpc->buf, rpc->alloc);
 314                if (!avail)
 315                        return 0;
 316                rpc->pos = 0;
 317                rpc->len = avail;
 318        }
 319
 320        if (max < avail)
 321                avail = max;
 322        memcpy(ptr, rpc->buf + rpc->pos, avail);
 323        rpc->pos += avail;
 324        return avail;
 325}
 326
 327#ifndef NO_CURL_IOCTL
 328static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 329{
 330        struct rpc_state *rpc = clientp;
 331
 332        switch (cmd) {
 333        case CURLIOCMD_NOP:
 334                return CURLIOE_OK;
 335
 336        case CURLIOCMD_RESTARTREAD:
 337                if (rpc->initial_buffer) {
 338                        rpc->pos = 0;
 339                        return CURLIOE_OK;
 340                }
 341                fprintf(stderr, "Unable to rewind rpc post data - try increasing http.postBuffer\n");
 342                return CURLIOE_FAILRESTART;
 343
 344        default:
 345                return CURLIOE_UNKNOWNCMD;
 346        }
 347}
 348#endif
 349
 350static size_t rpc_in(const void *ptr, size_t eltsize,
 351                size_t nmemb, void *buffer_)
 352{
 353        size_t size = eltsize * nmemb;
 354        struct rpc_state *rpc = buffer_;
 355        write_or_die(rpc->in, ptr, size);
 356        return size;
 357}
 358
 359static int run_slot(struct active_request_slot *slot)
 360{
 361        int err = 0;
 362        struct slot_results results;
 363
 364        slot->results = &results;
 365        slot->curl_result = curl_easy_perform(slot->curl);
 366        finish_active_slot(slot);
 367
 368        if (results.curl_result != CURLE_OK) {
 369                err |= error("RPC failed; result=%d, HTTP code = %ld",
 370                        results.curl_result, results.http_code);
 371        }
 372
 373        return err;
 374}
 375
 376static int probe_rpc(struct rpc_state *rpc)
 377{
 378        struct active_request_slot *slot;
 379        struct curl_slist *headers = NULL;
 380        struct strbuf buf = STRBUF_INIT;
 381        int err;
 382
 383        slot = get_active_slot();
 384
 385        headers = curl_slist_append(headers, rpc->hdr_content_type);
 386        headers = curl_slist_append(headers, rpc->hdr_accept);
 387
 388        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 389        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 390        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 391        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
 392        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 393        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 394        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 395        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 396        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 397
 398        err = run_slot(slot);
 399
 400        curl_slist_free_all(headers);
 401        strbuf_release(&buf);
 402        return err;
 403}
 404
 405static int post_rpc(struct rpc_state *rpc)
 406{
 407        struct active_request_slot *slot;
 408        struct curl_slist *headers = NULL;
 409        int use_gzip = rpc->gzip_request;
 410        char *gzip_body = NULL;
 411        int err, large_request = 0;
 412
 413        /* Try to load the entire request, if we can fit it into the
 414         * allocated buffer space we can use HTTP/1.0 and avoid the
 415         * chunked encoding mess.
 416         */
 417        while (1) {
 418                size_t left = rpc->alloc - rpc->len;
 419                char *buf = rpc->buf + rpc->len;
 420                int n;
 421
 422                if (left < LARGE_PACKET_MAX) {
 423                        large_request = 1;
 424                        use_gzip = 0;
 425                        break;
 426                }
 427
 428                n = packet_read_line(rpc->out, buf, left);
 429                if (!n)
 430                        break;
 431                rpc->len += n;
 432        }
 433
 434        if (large_request) {
 435                err = probe_rpc(rpc);
 436                if (err)
 437                        return err;
 438        }
 439
 440        slot = get_active_slot();
 441
 442        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 443        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 444        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 445        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
 446
 447        headers = curl_slist_append(headers, rpc->hdr_content_type);
 448        headers = curl_slist_append(headers, rpc->hdr_accept);
 449        headers = curl_slist_append(headers, "Expect:");
 450
 451        if (large_request) {
 452                /* The request body is large and the size cannot be predicted.
 453                 * We must use chunked encoding to send it.
 454                 */
 455                headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 456                rpc->initial_buffer = 1;
 457                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 458                curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 459#ifndef NO_CURL_IOCTL
 460                curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 461                curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 462#endif
 463                if (options.verbosity > 1) {
 464                        fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 465                        fflush(stderr);
 466                }
 467
 468        } else if (use_gzip && 1024 < rpc->len) {
 469                /* The client backend isn't giving us compressed data so
 470                 * we can try to deflate it ourselves, this may save on.
 471                 * the transfer time.
 472                 */
 473                size_t size;
 474                z_stream stream;
 475                int ret;
 476
 477                memset(&stream, 0, sizeof(stream));
 478                ret = deflateInit2(&stream, Z_BEST_COMPRESSION,
 479                                Z_DEFLATED, (15 + 16),
 480                                8, Z_DEFAULT_STRATEGY);
 481                if (ret != Z_OK)
 482                        die("cannot deflate request; zlib init error %d", ret);
 483                size = deflateBound(&stream, rpc->len);
 484                gzip_body = xmalloc(size);
 485
 486                stream.next_in = (unsigned char *)rpc->buf;
 487                stream.avail_in = rpc->len;
 488                stream.next_out = (unsigned char *)gzip_body;
 489                stream.avail_out = size;
 490
 491                ret = deflate(&stream, Z_FINISH);
 492                if (ret != Z_STREAM_END)
 493                        die("cannot deflate request; zlib deflate error %d", ret);
 494
 495                ret = deflateEnd(&stream);
 496                if (ret != Z_OK)
 497                        die("cannot deflate request; zlib end error %d", ret);
 498
 499                size = stream.total_out;
 500
 501                headers = curl_slist_append(headers, "Content-Encoding: gzip");
 502                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 503                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, size);
 504
 505                if (options.verbosity > 1) {
 506                        fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 507                                rpc->service_name,
 508                                (unsigned long)rpc->len, (unsigned long)size);
 509                        fflush(stderr);
 510                }
 511        } else {
 512                /* We know the complete request size in advance, use the
 513                 * more normal Content-Length approach.
 514                 */
 515                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 516                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 517                if (options.verbosity > 1) {
 518                        fprintf(stderr, "POST %s (%lu bytes)\n",
 519                                rpc->service_name, (unsigned long)rpc->len);
 520                        fflush(stderr);
 521                }
 522        }
 523
 524        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 525        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 526        curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 527
 528        err = run_slot(slot);
 529
 530        curl_slist_free_all(headers);
 531        free(gzip_body);
 532        return err;
 533}
 534
 535static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 536{
 537        const char *svc = rpc->service_name;
 538        struct strbuf buf = STRBUF_INIT;
 539        struct child_process client;
 540        int err = 0;
 541
 542        memset(&client, 0, sizeof(client));
 543        client.in = -1;
 544        client.out = -1;
 545        client.git_cmd = 1;
 546        client.argv = rpc->argv;
 547        if (start_command(&client))
 548                exit(1);
 549        if (heads)
 550                write_or_die(client.in, heads->buf, heads->len);
 551
 552        rpc->alloc = http_post_buffer;
 553        rpc->buf = xmalloc(rpc->alloc);
 554        rpc->in = client.in;
 555        rpc->out = client.out;
 556        strbuf_init(&rpc->result, 0);
 557
 558        strbuf_addf(&buf, "%s%s", url, svc);
 559        rpc->service_url = strbuf_detach(&buf, NULL);
 560
 561        strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 562        rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 563
 564        strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 565        rpc->hdr_accept = strbuf_detach(&buf, NULL);
 566
 567        while (!err) {
 568                int n = packet_read_line(rpc->out, rpc->buf, rpc->alloc);
 569                if (!n)
 570                        break;
 571                rpc->pos = 0;
 572                rpc->len = n;
 573                err |= post_rpc(rpc);
 574        }
 575
 576        close(client.in);
 577        client.in = -1;
 578        if (!err) {
 579                strbuf_read(&rpc->result, client.out, 0);
 580        } else {
 581                char buf[4096];
 582                for (;;)
 583                        if (xread(client.out, buf, sizeof(buf)) <= 0)
 584                                break;
 585        }
 586
 587        close(client.out);
 588        client.out = -1;
 589
 590        err |= finish_command(&client);
 591        free(rpc->service_url);
 592        free(rpc->hdr_content_type);
 593        free(rpc->hdr_accept);
 594        free(rpc->buf);
 595        strbuf_release(&buf);
 596        return err;
 597}
 598
 599static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 600{
 601        struct walker *walker;
 602        char **targets = xmalloc(nr_heads * sizeof(char*));
 603        int ret, i;
 604
 605        if (options.depth)
 606                die("dumb http transport does not support --depth");
 607        for (i = 0; i < nr_heads; i++)
 608                targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 609
 610        walker = get_http_walker(url);
 611        walker->get_all = 1;
 612        walker->get_tree = 1;
 613        walker->get_history = 1;
 614        walker->get_verbosely = options.verbosity >= 3;
 615        walker->get_recover = 0;
 616        ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 617        walker_free(walker);
 618
 619        for (i = 0; i < nr_heads; i++)
 620                free(targets[i]);
 621        free(targets);
 622
 623        return ret ? error("Fetch failed.") : 0;
 624}
 625
 626static int fetch_git(struct discovery *heads,
 627        int nr_heads, struct ref **to_fetch)
 628{
 629        struct rpc_state rpc;
 630        char *depth_arg = NULL;
 631        const char **argv;
 632        int argc = 0, i, err;
 633
 634        argv = xmalloc((15 + nr_heads) * sizeof(char*));
 635        argv[argc++] = "fetch-pack";
 636        argv[argc++] = "--stateless-rpc";
 637        argv[argc++] = "--lock-pack";
 638        if (options.followtags)
 639                argv[argc++] = "--include-tag";
 640        if (options.thin)
 641                argv[argc++] = "--thin";
 642        if (options.verbosity >= 3) {
 643                argv[argc++] = "-v";
 644                argv[argc++] = "-v";
 645        }
 646        if (!options.progress)
 647                argv[argc++] = "--no-progress";
 648        if (options.depth) {
 649                struct strbuf buf = STRBUF_INIT;
 650                strbuf_addf(&buf, "--depth=%lu", options.depth);
 651                depth_arg = strbuf_detach(&buf, NULL);
 652                argv[argc++] = depth_arg;
 653        }
 654        argv[argc++] = url;
 655        for (i = 0; i < nr_heads; i++) {
 656                struct ref *ref = to_fetch[i];
 657                if (!ref->name || !*ref->name)
 658                        die("cannot fetch by sha1 over smart http");
 659                argv[argc++] = ref->name;
 660        }
 661        argv[argc++] = NULL;
 662
 663        memset(&rpc, 0, sizeof(rpc));
 664        rpc.service_name = "git-upload-pack",
 665        rpc.argv = argv;
 666        rpc.gzip_request = 1;
 667
 668        err = rpc_service(&rpc, heads);
 669        if (rpc.result.len)
 670                safe_write(1, rpc.result.buf, rpc.result.len);
 671        strbuf_release(&rpc.result);
 672        free(argv);
 673        free(depth_arg);
 674        return err;
 675}
 676
 677static int fetch(int nr_heads, struct ref **to_fetch)
 678{
 679        struct discovery *d = discover_refs("git-upload-pack");
 680        if (d->proto_git)
 681                return fetch_git(d, nr_heads, to_fetch);
 682        else
 683                return fetch_dumb(nr_heads, to_fetch);
 684}
 685
 686static void parse_fetch(struct strbuf *buf)
 687{
 688        struct ref **to_fetch = NULL;
 689        struct ref *list_head = NULL;
 690        struct ref **list = &list_head;
 691        int alloc_heads = 0, nr_heads = 0;
 692
 693        do {
 694                if (!prefixcmp(buf->buf, "fetch ")) {
 695                        char *p = buf->buf + strlen("fetch ");
 696                        char *name;
 697                        struct ref *ref;
 698                        unsigned char old_sha1[20];
 699
 700                        if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 701                                die("protocol error: expected sha/ref, got %s'", p);
 702                        if (p[40] == ' ')
 703                                name = p + 41;
 704                        else if (!p[40])
 705                                name = "";
 706                        else
 707                                die("protocol error: expected sha/ref, got %s'", p);
 708
 709                        ref = alloc_ref(name);
 710                        hashcpy(ref->old_sha1, old_sha1);
 711
 712                        *list = ref;
 713                        list = &ref->next;
 714
 715                        ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 716                        to_fetch[nr_heads++] = ref;
 717                }
 718                else
 719                        die("http transport does not support %s", buf->buf);
 720
 721                strbuf_reset(buf);
 722                if (strbuf_getline(buf, stdin, '\n') == EOF)
 723                        return;
 724                if (!*buf->buf)
 725                        break;
 726        } while (1);
 727
 728        if (fetch(nr_heads, to_fetch))
 729                exit(128); /* error already reported */
 730        free_refs(list_head);
 731        free(to_fetch);
 732
 733        printf("\n");
 734        fflush(stdout);
 735        strbuf_reset(buf);
 736}
 737
 738static int push_dav(int nr_spec, char **specs)
 739{
 740        const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 741        int argc = 0, i;
 742
 743        argv[argc++] = "http-push";
 744        argv[argc++] = "--helper-status";
 745        if (options.dry_run)
 746                argv[argc++] = "--dry-run";
 747        if (options.verbosity > 1)
 748                argv[argc++] = "--verbose";
 749        argv[argc++] = url;
 750        for (i = 0; i < nr_spec; i++)
 751                argv[argc++] = specs[i];
 752        argv[argc++] = NULL;
 753
 754        if (run_command_v_opt(argv, RUN_GIT_CMD))
 755                die("git-%s failed", argv[0]);
 756        free(argv);
 757        return 0;
 758}
 759
 760static int push_git(struct discovery *heads, int nr_spec, char **specs)
 761{
 762        struct rpc_state rpc;
 763        const char **argv;
 764        int argc = 0, i, err;
 765
 766        argv = xmalloc((10 + nr_spec) * sizeof(char*));
 767        argv[argc++] = "send-pack";
 768        argv[argc++] = "--stateless-rpc";
 769        argv[argc++] = "--helper-status";
 770        if (options.thin)
 771                argv[argc++] = "--thin";
 772        if (options.dry_run)
 773                argv[argc++] = "--dry-run";
 774        if (options.verbosity > 1)
 775                argv[argc++] = "--verbose";
 776        argv[argc++] = url;
 777        for (i = 0; i < nr_spec; i++)
 778                argv[argc++] = specs[i];
 779        argv[argc++] = NULL;
 780
 781        memset(&rpc, 0, sizeof(rpc));
 782        rpc.service_name = "git-receive-pack",
 783        rpc.argv = argv;
 784
 785        err = rpc_service(&rpc, heads);
 786        if (rpc.result.len)
 787                safe_write(1, rpc.result.buf, rpc.result.len);
 788        strbuf_release(&rpc.result);
 789        free(argv);
 790        return err;
 791}
 792
 793static int push(int nr_spec, char **specs)
 794{
 795        struct discovery *heads = discover_refs("git-receive-pack");
 796        int ret;
 797
 798        if (heads->proto_git)
 799                ret = push_git(heads, nr_spec, specs);
 800        else
 801                ret = push_dav(nr_spec, specs);
 802        free_discovery(heads);
 803        return ret;
 804}
 805
 806static void parse_push(struct strbuf *buf)
 807{
 808        char **specs = NULL;
 809        int alloc_spec = 0, nr_spec = 0, i;
 810
 811        do {
 812                if (!prefixcmp(buf->buf, "push ")) {
 813                        ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 814                        specs[nr_spec++] = xstrdup(buf->buf + 5);
 815                }
 816                else
 817                        die("http transport does not support %s", buf->buf);
 818
 819                strbuf_reset(buf);
 820                if (strbuf_getline(buf, stdin, '\n') == EOF)
 821                        return;
 822                if (!*buf->buf)
 823                        break;
 824        } while (1);
 825
 826        if (push(nr_spec, specs))
 827                exit(128); /* error already reported */
 828        for (i = 0; i < nr_spec; i++)
 829                free(specs[i]);
 830        free(specs);
 831
 832        printf("\n");
 833        fflush(stdout);
 834}
 835
 836int main(int argc, const char **argv)
 837{
 838        struct strbuf buf = STRBUF_INIT;
 839        int nongit;
 840
 841        git_extract_argv0_path(argv[0]);
 842        setup_git_directory_gently(&nongit);
 843        if (argc < 2) {
 844                fprintf(stderr, "Remote needed\n");
 845                return 1;
 846        }
 847
 848        options.verbosity = 1;
 849        options.progress = !!isatty(2);
 850        options.thin = 1;
 851
 852        remote = remote_get(argv[1]);
 853
 854        if (argc > 2) {
 855                end_url_with_slash(&buf, argv[2]);
 856        } else {
 857                end_url_with_slash(&buf, remote->url[0]);
 858        }
 859
 860        url = strbuf_detach(&buf, NULL);
 861
 862        http_init(remote);
 863
 864        do {
 865                if (strbuf_getline(&buf, stdin, '\n') == EOF)
 866                        break;
 867                if (!prefixcmp(buf.buf, "fetch ")) {
 868                        if (nongit)
 869                                die("Fetch attempted without a local repo");
 870                        parse_fetch(&buf);
 871
 872                } else if (!strcmp(buf.buf, "list") || !prefixcmp(buf.buf, "list ")) {
 873                        int for_push = !!strstr(buf.buf + 4, "for-push");
 874                        output_refs(get_refs(for_push));
 875
 876                } else if (!prefixcmp(buf.buf, "push ")) {
 877                        parse_push(&buf);
 878
 879                } else if (!prefixcmp(buf.buf, "option ")) {
 880                        char *name = buf.buf + strlen("option ");
 881                        char *value = strchr(name, ' ');
 882                        int result;
 883
 884                        if (value)
 885                                *value++ = '\0';
 886                        else
 887                                value = "true";
 888
 889                        result = set_option(name, value);
 890                        if (!result)
 891                                printf("ok\n");
 892                        else if (result < 0)
 893                                printf("error invalid value\n");
 894                        else
 895                                printf("unsupported\n");
 896                        fflush(stdout);
 897
 898                } else if (!strcmp(buf.buf, "capabilities")) {
 899                        printf("fetch\n");
 900                        printf("option\n");
 901                        printf("push\n");
 902                        printf("\n");
 903                        fflush(stdout);
 904                } else {
 905                        return 1;
 906                }
 907                strbuf_reset(&buf);
 908        } while (1);
 909
 910        http_cleanup();
 911
 912        return 0;
 913}