Andrew's git / gitweb.git / remote-curl.c
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remote-curl.con commit t6022: Add testcase for spurious "refusing to lose untracked" messages (3f680ff)
   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        strbuf_read(&rpc->result, client.out, 0);
 579
 580        close(client.out);
 581        client.out = -1;
 582
 583        err |= finish_command(&client);
 584        free(rpc->service_url);
 585        free(rpc->hdr_content_type);
 586        free(rpc->hdr_accept);
 587        free(rpc->buf);
 588        strbuf_release(&buf);
 589        return err;
 590}
 591
 592static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 593{
 594        struct walker *walker;
 595        char **targets = xmalloc(nr_heads * sizeof(char*));
 596        int ret, i;
 597
 598        if (options.depth)
 599                die("dumb http transport does not support --depth");
 600        for (i = 0; i < nr_heads; i++)
 601                targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 602
 603        walker = get_http_walker(url);
 604        walker->get_all = 1;
 605        walker->get_tree = 1;
 606        walker->get_history = 1;
 607        walker->get_verbosely = options.verbosity >= 3;
 608        walker->get_recover = 0;
 609        ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 610        walker_free(walker);
 611
 612        for (i = 0; i < nr_heads; i++)
 613                free(targets[i]);
 614        free(targets);
 615
 616        return ret ? error("Fetch failed.") : 0;
 617}
 618
 619static int fetch_git(struct discovery *heads,
 620        int nr_heads, struct ref **to_fetch)
 621{
 622        struct rpc_state rpc;
 623        char *depth_arg = NULL;
 624        const char **argv;
 625        int argc = 0, i, err;
 626
 627        argv = xmalloc((15 + nr_heads) * sizeof(char*));
 628        argv[argc++] = "fetch-pack";
 629        argv[argc++] = "--stateless-rpc";
 630        argv[argc++] = "--lock-pack";
 631        if (options.followtags)
 632                argv[argc++] = "--include-tag";
 633        if (options.thin)
 634                argv[argc++] = "--thin";
 635        if (options.verbosity >= 3) {
 636                argv[argc++] = "-v";
 637                argv[argc++] = "-v";
 638        }
 639        if (!options.progress)
 640                argv[argc++] = "--no-progress";
 641        if (options.depth) {
 642                struct strbuf buf = STRBUF_INIT;
 643                strbuf_addf(&buf, "--depth=%lu", options.depth);
 644                depth_arg = strbuf_detach(&buf, NULL);
 645                argv[argc++] = depth_arg;
 646        }
 647        argv[argc++] = url;
 648        for (i = 0; i < nr_heads; i++) {
 649                struct ref *ref = to_fetch[i];
 650                if (!ref->name || !*ref->name)
 651                        die("cannot fetch by sha1 over smart http");
 652                argv[argc++] = ref->name;
 653        }
 654        argv[argc++] = NULL;
 655
 656        memset(&rpc, 0, sizeof(rpc));
 657        rpc.service_name = "git-upload-pack",
 658        rpc.argv = argv;
 659        rpc.gzip_request = 1;
 660
 661        err = rpc_service(&rpc, heads);
 662        if (rpc.result.len)
 663                safe_write(1, rpc.result.buf, rpc.result.len);
 664        strbuf_release(&rpc.result);
 665        free(argv);
 666        free(depth_arg);
 667        return err;
 668}
 669
 670static int fetch(int nr_heads, struct ref **to_fetch)
 671{
 672        struct discovery *d = discover_refs("git-upload-pack");
 673        if (d->proto_git)
 674                return fetch_git(d, nr_heads, to_fetch);
 675        else
 676                return fetch_dumb(nr_heads, to_fetch);
 677}
 678
 679static void parse_fetch(struct strbuf *buf)
 680{
 681        struct ref **to_fetch = NULL;
 682        struct ref *list_head = NULL;
 683        struct ref **list = &list_head;
 684        int alloc_heads = 0, nr_heads = 0;
 685
 686        do {
 687                if (!prefixcmp(buf->buf, "fetch ")) {
 688                        char *p = buf->buf + strlen("fetch ");
 689                        char *name;
 690                        struct ref *ref;
 691                        unsigned char old_sha1[20];
 692
 693                        if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 694                                die("protocol error: expected sha/ref, got %s'", p);
 695                        if (p[40] == ' ')
 696                                name = p + 41;
 697                        else if (!p[40])
 698                                name = "";
 699                        else
 700                                die("protocol error: expected sha/ref, got %s'", p);
 701
 702                        ref = alloc_ref(name);
 703                        hashcpy(ref->old_sha1, old_sha1);
 704
 705                        *list = ref;
 706                        list = &ref->next;
 707
 708                        ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 709                        to_fetch[nr_heads++] = ref;
 710                }
 711                else
 712                        die("http transport does not support %s", buf->buf);
 713
 714                strbuf_reset(buf);
 715                if (strbuf_getline(buf, stdin, '\n') == EOF)
 716                        return;
 717                if (!*buf->buf)
 718                        break;
 719        } while (1);
 720
 721        if (fetch(nr_heads, to_fetch))
 722                exit(128); /* error already reported */
 723        free_refs(list_head);
 724        free(to_fetch);
 725
 726        printf("\n");
 727        fflush(stdout);
 728        strbuf_reset(buf);
 729}
 730
 731static int push_dav(int nr_spec, char **specs)
 732{
 733        const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 734        int argc = 0, i;
 735
 736        argv[argc++] = "http-push";
 737        argv[argc++] = "--helper-status";
 738        if (options.dry_run)
 739                argv[argc++] = "--dry-run";
 740        if (options.verbosity > 1)
 741                argv[argc++] = "--verbose";
 742        argv[argc++] = url;
 743        for (i = 0; i < nr_spec; i++)
 744                argv[argc++] = specs[i];
 745        argv[argc++] = NULL;
 746
 747        if (run_command_v_opt(argv, RUN_GIT_CMD))
 748                die("git-%s failed", argv[0]);
 749        free(argv);
 750        return 0;
 751}
 752
 753static int push_git(struct discovery *heads, int nr_spec, char **specs)
 754{
 755        struct rpc_state rpc;
 756        const char **argv;
 757        int argc = 0, i, err;
 758
 759        argv = xmalloc((10 + nr_spec) * sizeof(char*));
 760        argv[argc++] = "send-pack";
 761        argv[argc++] = "--stateless-rpc";
 762        argv[argc++] = "--helper-status";
 763        if (options.thin)
 764                argv[argc++] = "--thin";
 765        if (options.dry_run)
 766                argv[argc++] = "--dry-run";
 767        if (options.verbosity > 1)
 768                argv[argc++] = "--verbose";
 769        argv[argc++] = url;
 770        for (i = 0; i < nr_spec; i++)
 771                argv[argc++] = specs[i];
 772        argv[argc++] = NULL;
 773
 774        memset(&rpc, 0, sizeof(rpc));
 775        rpc.service_name = "git-receive-pack",
 776        rpc.argv = argv;
 777
 778        err = rpc_service(&rpc, heads);
 779        if (rpc.result.len)
 780                safe_write(1, rpc.result.buf, rpc.result.len);
 781        strbuf_release(&rpc.result);
 782        free(argv);
 783        return err;
 784}
 785
 786static int push(int nr_spec, char **specs)
 787{
 788        struct discovery *heads = discover_refs("git-receive-pack");
 789        int ret;
 790
 791        if (heads->proto_git)
 792                ret = push_git(heads, nr_spec, specs);
 793        else
 794                ret = push_dav(nr_spec, specs);
 795        free_discovery(heads);
 796        return ret;
 797}
 798
 799static void parse_push(struct strbuf *buf)
 800{
 801        char **specs = NULL;
 802        int alloc_spec = 0, nr_spec = 0, i;
 803
 804        do {
 805                if (!prefixcmp(buf->buf, "push ")) {
 806                        ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 807                        specs[nr_spec++] = xstrdup(buf->buf + 5);
 808                }
 809                else
 810                        die("http transport does not support %s", buf->buf);
 811
 812                strbuf_reset(buf);
 813                if (strbuf_getline(buf, stdin, '\n') == EOF)
 814                        return;
 815                if (!*buf->buf)
 816                        break;
 817        } while (1);
 818
 819        if (push(nr_spec, specs))
 820                exit(128); /* error already reported */
 821        for (i = 0; i < nr_spec; i++)
 822                free(specs[i]);
 823        free(specs);
 824
 825        printf("\n");
 826        fflush(stdout);
 827}
 828
 829int main(int argc, const char **argv)
 830{
 831        struct strbuf buf = STRBUF_INIT;
 832        int nongit;
 833
 834        git_extract_argv0_path(argv[0]);
 835        setup_git_directory_gently(&nongit);
 836        if (argc < 2) {
 837                fprintf(stderr, "Remote needed\n");
 838                return 1;
 839        }
 840
 841        options.verbosity = 1;
 842        options.progress = !!isatty(2);
 843        options.thin = 1;
 844
 845        remote = remote_get(argv[1]);
 846
 847        if (argc > 2) {
 848                end_url_with_slash(&buf, argv[2]);
 849        } else {
 850                end_url_with_slash(&buf, remote->url[0]);
 851        }
 852
 853        url = strbuf_detach(&buf, NULL);
 854
 855        http_init(remote);
 856
 857        do {
 858                if (strbuf_getline(&buf, stdin, '\n') == EOF)
 859                        break;
 860                if (!prefixcmp(buf.buf, "fetch ")) {
 861                        if (nongit)
 862                                die("Fetch attempted without a local repo");
 863                        parse_fetch(&buf);
 864
 865                } else if (!strcmp(buf.buf, "list") || !prefixcmp(buf.buf, "list ")) {
 866                        int for_push = !!strstr(buf.buf + 4, "for-push");
 867                        output_refs(get_refs(for_push));
 868
 869                } else if (!prefixcmp(buf.buf, "push ")) {
 870                        parse_push(&buf);
 871
 872                } else if (!prefixcmp(buf.buf, "option ")) {
 873                        char *name = buf.buf + strlen("option ");
 874                        char *value = strchr(name, ' ');
 875                        int result;
 876
 877                        if (value)
 878                                *value++ = '\0';
 879                        else
 880                                value = "true";
 881
 882                        result = set_option(name, value);
 883                        if (!result)
 884                                printf("ok\n");
 885                        else if (result < 0)
 886                                printf("error invalid value\n");
 887                        else
 888                                printf("unsupported\n");
 889                        fflush(stdout);
 890
 891                } else if (!strcmp(buf.buf, "capabilities")) {
 892                        printf("fetch\n");
 893                        printf("option\n");
 894                        printf("push\n");
 895                        printf("\n");
 896                        fflush(stdout);
 897                } else {
 898                        return 1;
 899                }
 900                strbuf_reset(&buf);
 901        } while (1);
 902
 903        http_cleanup();
 904
 905        return 0;
 906}