Andrew's git / gitweb.git / remote-curl.c
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remote-curl.con commit sequencer.c: rework search for start of footer to improve clarity (fa1727f)
   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, maybe_smart = 0;
  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             git_env_bool("GIT_SMART_HTTP", 1)) {
 107                maybe_smart = 1;
 108                if (!strchr(url, '?'))
 109                        strbuf_addch(&buffer, '?');
 110                else
 111                        strbuf_addch(&buffer, '&');
 112                strbuf_addf(&buffer, "service=%s", service);
 113        }
 114        refs_url = strbuf_detach(&buffer, NULL);
 115
 116        http_ret = http_get_strbuf(refs_url, &buffer, HTTP_NO_CACHE);
 117        switch (http_ret) {
 118        case HTTP_OK:
 119                break;
 120        case HTTP_MISSING_TARGET:
 121                die("%s not found: did you run git update-server-info on the"
 122                    " server?", refs_url);
 123        case HTTP_NOAUTH:
 124                die("Authentication failed");
 125        default:
 126                http_error(refs_url, http_ret);
 127                die("HTTP request failed");
 128        }
 129
 130        last= xcalloc(1, sizeof(*last_discovery));
 131        last->service = service;
 132        last->buf_alloc = strbuf_detach(&buffer, &last->len);
 133        last->buf = last->buf_alloc;
 134
 135        if (maybe_smart && 5 <= last->len && last->buf[4] == '#') {
 136                /* smart HTTP response; validate that the service
 137                 * pkt-line matches our request.
 138                 */
 139                struct strbuf exp = STRBUF_INIT;
 140
 141                if (packet_get_line(&buffer, &last->buf, &last->len) <= 0)
 142                        die("%s has invalid packet header", refs_url);
 143                if (buffer.len && buffer.buf[buffer.len - 1] == '\n')
 144                        strbuf_setlen(&buffer, buffer.len - 1);
 145
 146                strbuf_addf(&exp, "# service=%s", service);
 147                if (strbuf_cmp(&exp, &buffer))
 148                        die("invalid server response; got '%s'", buffer.buf);
 149                strbuf_release(&exp);
 150
 151                /* The header can include additional metadata lines, up
 152                 * until a packet flush marker.  Ignore these now, but
 153                 * in the future we might start to scan them.
 154                 */
 155                strbuf_reset(&buffer);
 156                while (packet_get_line(&buffer, &last->buf, &last->len) > 0)
 157                        strbuf_reset(&buffer);
 158
 159                last->proto_git = 1;
 160        }
 161
 162        free(refs_url);
 163        strbuf_release(&buffer);
 164        last_discovery = last;
 165        return last;
 166}
 167
 168static int write_discovery(int in, int out, void *data)
 169{
 170        struct discovery *heads = data;
 171        int err = 0;
 172        if (write_in_full(out, heads->buf, heads->len) != heads->len)
 173                err = 1;
 174        close(out);
 175        return err;
 176}
 177
 178static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 179{
 180        struct ref *list = NULL;
 181        struct async async;
 182
 183        memset(&async, 0, sizeof(async));
 184        async.proc = write_discovery;
 185        async.data = heads;
 186        async.out = -1;
 187
 188        if (start_async(&async))
 189                die("cannot start thread to parse advertised refs");
 190        get_remote_heads(async.out, &list,
 191                        for_push ? REF_NORMAL : 0, NULL);
 192        close(async.out);
 193        if (finish_async(&async))
 194                die("ref parsing thread failed");
 195        return list;
 196}
 197
 198static struct ref *parse_info_refs(struct discovery *heads)
 199{
 200        char *data, *start, *mid;
 201        char *ref_name;
 202        int i = 0;
 203
 204        struct ref *refs = NULL;
 205        struct ref *ref = NULL;
 206        struct ref *last_ref = NULL;
 207
 208        data = heads->buf;
 209        start = NULL;
 210        mid = data;
 211        while (i < heads->len) {
 212                if (!start) {
 213                        start = &data[i];
 214                }
 215                if (data[i] == '\t')
 216                        mid = &data[i];
 217                if (data[i] == '\n') {
 218                        if (mid - start != 40)
 219                                die("%sinfo/refs not valid: is this a git repository?", url);
 220                        data[i] = 0;
 221                        ref_name = mid + 1;
 222                        ref = xmalloc(sizeof(struct ref) +
 223                                      strlen(ref_name) + 1);
 224                        memset(ref, 0, sizeof(struct ref));
 225                        strcpy(ref->name, ref_name);
 226                        get_sha1_hex(start, ref->old_sha1);
 227                        if (!refs)
 228                                refs = ref;
 229                        if (last_ref)
 230                                last_ref->next = ref;
 231                        last_ref = ref;
 232                        start = NULL;
 233                }
 234                i++;
 235        }
 236
 237        ref = alloc_ref("HEAD");
 238        if (!http_fetch_ref(url, ref) &&
 239            !resolve_remote_symref(ref, refs)) {
 240                ref->next = refs;
 241                refs = ref;
 242        } else {
 243                free(ref);
 244        }
 245
 246        return refs;
 247}
 248
 249static struct ref *get_refs(int for_push)
 250{
 251        struct discovery *heads;
 252
 253        if (for_push)
 254                heads = discover_refs("git-receive-pack");
 255        else
 256                heads = discover_refs("git-upload-pack");
 257
 258        if (heads->proto_git)
 259                return parse_git_refs(heads, for_push);
 260        return parse_info_refs(heads);
 261}
 262
 263static void output_refs(struct ref *refs)
 264{
 265        struct ref *posn;
 266        for (posn = refs; posn; posn = posn->next) {
 267                if (posn->symref)
 268                        printf("@%s %s\n", posn->symref, posn->name);
 269                else
 270                        printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
 271        }
 272        printf("\n");
 273        fflush(stdout);
 274        free_refs(refs);
 275}
 276
 277struct rpc_state {
 278        const char *service_name;
 279        const char **argv;
 280        struct strbuf *stdin_preamble;
 281        char *service_url;
 282        char *hdr_content_type;
 283        char *hdr_accept;
 284        char *buf;
 285        size_t alloc;
 286        size_t len;
 287        size_t pos;
 288        int in;
 289        int out;
 290        struct strbuf result;
 291        unsigned gzip_request : 1;
 292        unsigned initial_buffer : 1;
 293};
 294
 295static size_t rpc_out(void *ptr, size_t eltsize,
 296                size_t nmemb, void *buffer_)
 297{
 298        size_t max = eltsize * nmemb;
 299        struct rpc_state *rpc = buffer_;
 300        size_t avail = rpc->len - rpc->pos;
 301
 302        if (!avail) {
 303                rpc->initial_buffer = 0;
 304                avail = packet_read_line(rpc->out, rpc->buf, rpc->alloc);
 305                if (!avail)
 306                        return 0;
 307                rpc->pos = 0;
 308                rpc->len = avail;
 309        }
 310
 311        if (max < avail)
 312                avail = max;
 313        memcpy(ptr, rpc->buf + rpc->pos, avail);
 314        rpc->pos += avail;
 315        return avail;
 316}
 317
 318#ifndef NO_CURL_IOCTL
 319static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 320{
 321        struct rpc_state *rpc = clientp;
 322
 323        switch (cmd) {
 324        case CURLIOCMD_NOP:
 325                return CURLIOE_OK;
 326
 327        case CURLIOCMD_RESTARTREAD:
 328                if (rpc->initial_buffer) {
 329                        rpc->pos = 0;
 330                        return CURLIOE_OK;
 331                }
 332                fprintf(stderr, "Unable to rewind rpc post data - try increasing http.postBuffer\n");
 333                return CURLIOE_FAILRESTART;
 334
 335        default:
 336                return CURLIOE_UNKNOWNCMD;
 337        }
 338}
 339#endif
 340
 341static size_t rpc_in(char *ptr, size_t eltsize,
 342                size_t nmemb, void *buffer_)
 343{
 344        size_t size = eltsize * nmemb;
 345        struct rpc_state *rpc = buffer_;
 346        write_or_die(rpc->in, ptr, size);
 347        return size;
 348}
 349
 350static int run_slot(struct active_request_slot *slot)
 351{
 352        int err;
 353        struct slot_results results;
 354
 355        slot->results = &results;
 356        slot->curl_result = curl_easy_perform(slot->curl);
 357        finish_active_slot(slot);
 358
 359        err = handle_curl_result(&results);
 360        if (err != HTTP_OK && err != HTTP_REAUTH) {
 361                error("RPC failed; result=%d, HTTP code = %ld",
 362                      results.curl_result, results.http_code);
 363        }
 364
 365        return err;
 366}
 367
 368static int probe_rpc(struct rpc_state *rpc)
 369{
 370        struct active_request_slot *slot;
 371        struct curl_slist *headers = NULL;
 372        struct strbuf buf = STRBUF_INIT;
 373        int err;
 374
 375        slot = get_active_slot();
 376
 377        headers = curl_slist_append(headers, rpc->hdr_content_type);
 378        headers = curl_slist_append(headers, rpc->hdr_accept);
 379
 380        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 381        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 382        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 383        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 384        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 385        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 386        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 387        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 388        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 389
 390        err = run_slot(slot);
 391
 392        curl_slist_free_all(headers);
 393        strbuf_release(&buf);
 394        return err;
 395}
 396
 397static int post_rpc(struct rpc_state *rpc)
 398{
 399        struct active_request_slot *slot;
 400        struct curl_slist *headers = NULL;
 401        int use_gzip = rpc->gzip_request;
 402        char *gzip_body = NULL;
 403        size_t gzip_size = 0;
 404        int err, large_request = 0;
 405
 406        /* Try to load the entire request, if we can fit it into the
 407         * allocated buffer space we can use HTTP/1.0 and avoid the
 408         * chunked encoding mess.
 409         */
 410        while (1) {
 411                size_t left = rpc->alloc - rpc->len;
 412                char *buf = rpc->buf + rpc->len;
 413                int n;
 414
 415                if (left < LARGE_PACKET_MAX) {
 416                        large_request = 1;
 417                        use_gzip = 0;
 418                        break;
 419                }
 420
 421                n = packet_read_line(rpc->out, buf, left);
 422                if (!n)
 423                        break;
 424                rpc->len += n;
 425        }
 426
 427        if (large_request) {
 428                do {
 429                        err = probe_rpc(rpc);
 430                } while (err == HTTP_REAUTH);
 431                if (err != HTTP_OK)
 432                        return -1;
 433        }
 434
 435        headers = curl_slist_append(headers, rpc->hdr_content_type);
 436        headers = curl_slist_append(headers, rpc->hdr_accept);
 437        headers = curl_slist_append(headers, "Expect:");
 438
 439retry:
 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, "gzip");
 446
 447        if (large_request) {
 448                /* The request body is large and the size cannot be predicted.
 449                 * We must use chunked encoding to send it.
 450                 */
 451                headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 452                rpc->initial_buffer = 1;
 453                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 454                curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 455#ifndef NO_CURL_IOCTL
 456                curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 457                curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 458#endif
 459                if (options.verbosity > 1) {
 460                        fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 461                        fflush(stderr);
 462                }
 463
 464        } else if (gzip_body) {
 465                /*
 466                 * If we are looping to retry authentication, then the previous
 467                 * run will have set up the headers and gzip buffer already,
 468                 * and we just need to send it.
 469                 */
 470                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 471                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 472
 473        } else if (use_gzip && 1024 < rpc->len) {
 474                /* The client backend isn't giving us compressed data so
 475                 * we can try to deflate it ourselves, this may save on.
 476                 * the transfer time.
 477                 */
 478                git_zstream stream;
 479                int ret;
 480
 481                memset(&stream, 0, sizeof(stream));
 482                git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 483                gzip_size = git_deflate_bound(&stream, rpc->len);
 484                gzip_body = xmalloc(gzip_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 = gzip_size;
 490
 491                ret = git_deflate(&stream, Z_FINISH);
 492                if (ret != Z_STREAM_END)
 493                        die("cannot deflate request; zlib deflate error %d", ret);
 494
 495                ret = git_deflate_end_gently(&stream);
 496                if (ret != Z_OK)
 497                        die("cannot deflate request; zlib end error %d", ret);
 498
 499                gzip_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, gzip_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)gzip_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        if (err == HTTP_REAUTH && !large_request)
 530                goto retry;
 531        if (err != HTTP_OK)
 532                err = -1;
 533
 534        curl_slist_free_all(headers);
 535        free(gzip_body);
 536        return err;
 537}
 538
 539static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 540{
 541        const char *svc = rpc->service_name;
 542        struct strbuf buf = STRBUF_INIT;
 543        struct strbuf *preamble = rpc->stdin_preamble;
 544        struct child_process client;
 545        int err = 0;
 546
 547        memset(&client, 0, sizeof(client));
 548        client.in = -1;
 549        client.out = -1;
 550        client.git_cmd = 1;
 551        client.argv = rpc->argv;
 552        if (start_command(&client))
 553                exit(1);
 554        if (preamble)
 555                write_or_die(client.in, preamble->buf, preamble->len);
 556        if (heads)
 557                write_or_die(client.in, heads->buf, heads->len);
 558
 559        rpc->alloc = http_post_buffer;
 560        rpc->buf = xmalloc(rpc->alloc);
 561        rpc->in = client.in;
 562        rpc->out = client.out;
 563        strbuf_init(&rpc->result, 0);
 564
 565        strbuf_addf(&buf, "%s%s", url, svc);
 566        rpc->service_url = strbuf_detach(&buf, NULL);
 567
 568        strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 569        rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 570
 571        strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 572        rpc->hdr_accept = strbuf_detach(&buf, NULL);
 573
 574        while (!err) {
 575                int n = packet_read_line(rpc->out, rpc->buf, rpc->alloc);
 576                if (!n)
 577                        break;
 578                rpc->pos = 0;
 579                rpc->len = n;
 580                err |= post_rpc(rpc);
 581        }
 582
 583        close(client.in);
 584        client.in = -1;
 585        if (!err) {
 586                strbuf_read(&rpc->result, client.out, 0);
 587        } else {
 588                char buf[4096];
 589                for (;;)
 590                        if (xread(client.out, buf, sizeof(buf)) <= 0)
 591                                break;
 592        }
 593
 594        close(client.out);
 595        client.out = -1;
 596
 597        err |= finish_command(&client);
 598        free(rpc->service_url);
 599        free(rpc->hdr_content_type);
 600        free(rpc->hdr_accept);
 601        free(rpc->buf);
 602        strbuf_release(&buf);
 603        return err;
 604}
 605
 606static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 607{
 608        struct walker *walker;
 609        char **targets = xmalloc(nr_heads * sizeof(char*));
 610        int ret, i;
 611
 612        if (options.depth)
 613                die("dumb http transport does not support --depth");
 614        for (i = 0; i < nr_heads; i++)
 615                targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 616
 617        walker = get_http_walker(url);
 618        walker->get_all = 1;
 619        walker->get_tree = 1;
 620        walker->get_history = 1;
 621        walker->get_verbosely = options.verbosity >= 3;
 622        walker->get_recover = 0;
 623        ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 624        walker_free(walker);
 625
 626        for (i = 0; i < nr_heads; i++)
 627                free(targets[i]);
 628        free(targets);
 629
 630        return ret ? error("Fetch failed.") : 0;
 631}
 632
 633static int fetch_git(struct discovery *heads,
 634        int nr_heads, struct ref **to_fetch)
 635{
 636        struct rpc_state rpc;
 637        struct strbuf preamble = STRBUF_INIT;
 638        char *depth_arg = NULL;
 639        int argc = 0, i, err;
 640        const char *argv[15];
 641
 642        argv[argc++] = "fetch-pack";
 643        argv[argc++] = "--stateless-rpc";
 644        argv[argc++] = "--stdin";
 645        argv[argc++] = "--lock-pack";
 646        if (options.followtags)
 647                argv[argc++] = "--include-tag";
 648        if (options.thin)
 649                argv[argc++] = "--thin";
 650        if (options.verbosity >= 3) {
 651                argv[argc++] = "-v";
 652                argv[argc++] = "-v";
 653        }
 654        if (!options.progress)
 655                argv[argc++] = "--no-progress";
 656        if (options.depth) {
 657                struct strbuf buf = STRBUF_INIT;
 658                strbuf_addf(&buf, "--depth=%lu", options.depth);
 659                depth_arg = strbuf_detach(&buf, NULL);
 660                argv[argc++] = depth_arg;
 661        }
 662        argv[argc++] = url;
 663        argv[argc++] = NULL;
 664
 665        for (i = 0; i < nr_heads; i++) {
 666                struct ref *ref = to_fetch[i];
 667                if (!ref->name || !*ref->name)
 668                        die("cannot fetch by sha1 over smart http");
 669                packet_buf_write(&preamble, "%s\n", ref->name);
 670        }
 671        packet_buf_flush(&preamble);
 672
 673        memset(&rpc, 0, sizeof(rpc));
 674        rpc.service_name = "git-upload-pack",
 675        rpc.argv = argv;
 676        rpc.stdin_preamble = &preamble;
 677        rpc.gzip_request = 1;
 678
 679        err = rpc_service(&rpc, heads);
 680        if (rpc.result.len)
 681                safe_write(1, rpc.result.buf, rpc.result.len);
 682        strbuf_release(&rpc.result);
 683        strbuf_release(&preamble);
 684        free(depth_arg);
 685        return err;
 686}
 687
 688static int fetch(int nr_heads, struct ref **to_fetch)
 689{
 690        struct discovery *d = discover_refs("git-upload-pack");
 691        if (d->proto_git)
 692                return fetch_git(d, nr_heads, to_fetch);
 693        else
 694                return fetch_dumb(nr_heads, to_fetch);
 695}
 696
 697static void parse_fetch(struct strbuf *buf)
 698{
 699        struct ref **to_fetch = NULL;
 700        struct ref *list_head = NULL;
 701        struct ref **list = &list_head;
 702        int alloc_heads = 0, nr_heads = 0;
 703
 704        do {
 705                if (!prefixcmp(buf->buf, "fetch ")) {
 706                        char *p = buf->buf + strlen("fetch ");
 707                        char *name;
 708                        struct ref *ref;
 709                        unsigned char old_sha1[20];
 710
 711                        if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 712                                die("protocol error: expected sha/ref, got %s'", p);
 713                        if (p[40] == ' ')
 714                                name = p + 41;
 715                        else if (!p[40])
 716                                name = "";
 717                        else
 718                                die("protocol error: expected sha/ref, got %s'", p);
 719
 720                        ref = alloc_ref(name);
 721                        hashcpy(ref->old_sha1, old_sha1);
 722
 723                        *list = ref;
 724                        list = &ref->next;
 725
 726                        ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 727                        to_fetch[nr_heads++] = ref;
 728                }
 729                else
 730                        die("http transport does not support %s", buf->buf);
 731
 732                strbuf_reset(buf);
 733                if (strbuf_getline(buf, stdin, '\n') == EOF)
 734                        return;
 735                if (!*buf->buf)
 736                        break;
 737        } while (1);
 738
 739        if (fetch(nr_heads, to_fetch))
 740                exit(128); /* error already reported */
 741        free_refs(list_head);
 742        free(to_fetch);
 743
 744        printf("\n");
 745        fflush(stdout);
 746        strbuf_reset(buf);
 747}
 748
 749static int push_dav(int nr_spec, char **specs)
 750{
 751        const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 752        int argc = 0, i;
 753
 754        argv[argc++] = "http-push";
 755        argv[argc++] = "--helper-status";
 756        if (options.dry_run)
 757                argv[argc++] = "--dry-run";
 758        if (options.verbosity > 1)
 759                argv[argc++] = "--verbose";
 760        argv[argc++] = url;
 761        for (i = 0; i < nr_spec; i++)
 762                argv[argc++] = specs[i];
 763        argv[argc++] = NULL;
 764
 765        if (run_command_v_opt(argv, RUN_GIT_CMD))
 766                die("git-%s failed", argv[0]);
 767        free(argv);
 768        return 0;
 769}
 770
 771static int push_git(struct discovery *heads, int nr_spec, char **specs)
 772{
 773        struct rpc_state rpc;
 774        const char **argv;
 775        int argc = 0, i, err;
 776
 777        argv = xmalloc((10 + nr_spec) * sizeof(char*));
 778        argv[argc++] = "send-pack";
 779        argv[argc++] = "--stateless-rpc";
 780        argv[argc++] = "--helper-status";
 781        if (options.thin)
 782                argv[argc++] = "--thin";
 783        if (options.dry_run)
 784                argv[argc++] = "--dry-run";
 785        if (options.verbosity == 0)
 786                argv[argc++] = "--quiet";
 787        else if (options.verbosity > 1)
 788                argv[argc++] = "--verbose";
 789        argv[argc++] = options.progress ? "--progress" : "--no-progress";
 790        argv[argc++] = url;
 791        for (i = 0; i < nr_spec; i++)
 792                argv[argc++] = specs[i];
 793        argv[argc++] = NULL;
 794
 795        memset(&rpc, 0, sizeof(rpc));
 796        rpc.service_name = "git-receive-pack",
 797        rpc.argv = argv;
 798
 799        err = rpc_service(&rpc, heads);
 800        if (rpc.result.len)
 801                safe_write(1, rpc.result.buf, rpc.result.len);
 802        strbuf_release(&rpc.result);
 803        free(argv);
 804        return err;
 805}
 806
 807static int push(int nr_spec, char **specs)
 808{
 809        struct discovery *heads = discover_refs("git-receive-pack");
 810        int ret;
 811
 812        if (heads->proto_git)
 813                ret = push_git(heads, nr_spec, specs);
 814        else
 815                ret = push_dav(nr_spec, specs);
 816        free_discovery(heads);
 817        return ret;
 818}
 819
 820static void parse_push(struct strbuf *buf)
 821{
 822        char **specs = NULL;
 823        int alloc_spec = 0, nr_spec = 0, i, ret;
 824
 825        do {
 826                if (!prefixcmp(buf->buf, "push ")) {
 827                        ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 828                        specs[nr_spec++] = xstrdup(buf->buf + 5);
 829                }
 830                else
 831                        die("http transport does not support %s", buf->buf);
 832
 833                strbuf_reset(buf);
 834                if (strbuf_getline(buf, stdin, '\n') == EOF)
 835                        goto free_specs;
 836                if (!*buf->buf)
 837                        break;
 838        } while (1);
 839
 840        ret = push(nr_spec, specs);
 841        printf("\n");
 842        fflush(stdout);
 843
 844        if (ret)
 845                exit(128); /* error already reported */
 846
 847 free_specs:
 848        for (i = 0; i < nr_spec; i++)
 849                free(specs[i]);
 850        free(specs);
 851}
 852
 853int main(int argc, const char **argv)
 854{
 855        struct strbuf buf = STRBUF_INIT;
 856        int nongit;
 857
 858        git_extract_argv0_path(argv[0]);
 859        setup_git_directory_gently(&nongit);
 860        if (argc < 2) {
 861                fprintf(stderr, "Remote needed\n");
 862                return 1;
 863        }
 864
 865        options.verbosity = 1;
 866        options.progress = !!isatty(2);
 867        options.thin = 1;
 868
 869        remote = remote_get(argv[1]);
 870
 871        if (argc > 2) {
 872                end_url_with_slash(&buf, argv[2]);
 873        } else {
 874                end_url_with_slash(&buf, remote->url[0]);
 875        }
 876
 877        url = strbuf_detach(&buf, NULL);
 878
 879        http_init(remote, url, 0);
 880
 881        do {
 882                if (strbuf_getline(&buf, stdin, '\n') == EOF) {
 883                        if (ferror(stdin))
 884                                fprintf(stderr, "Error reading command stream\n");
 885                        else
 886                                fprintf(stderr, "Unexpected end of command stream\n");
 887                        return 1;
 888                }
 889                if (buf.len == 0)
 890                        break;
 891                if (!prefixcmp(buf.buf, "fetch ")) {
 892                        if (nongit)
 893                                die("Fetch attempted without a local repo");
 894                        parse_fetch(&buf);
 895
 896                } else if (!strcmp(buf.buf, "list") || !prefixcmp(buf.buf, "list ")) {
 897                        int for_push = !!strstr(buf.buf + 4, "for-push");
 898                        output_refs(get_refs(for_push));
 899
 900                } else if (!prefixcmp(buf.buf, "push ")) {
 901                        parse_push(&buf);
 902
 903                } else if (!prefixcmp(buf.buf, "option ")) {
 904                        char *name = buf.buf + strlen("option ");
 905                        char *value = strchr(name, ' ');
 906                        int result;
 907
 908                        if (value)
 909                                *value++ = '\0';
 910                        else
 911                                value = "true";
 912
 913                        result = set_option(name, value);
 914                        if (!result)
 915                                printf("ok\n");
 916                        else if (result < 0)
 917                                printf("error invalid value\n");
 918                        else
 919                                printf("unsupported\n");
 920                        fflush(stdout);
 921
 922                } else if (!strcmp(buf.buf, "capabilities")) {
 923                        printf("fetch\n");
 924                        printf("option\n");
 925                        printf("push\n");
 926                        printf("\n");
 927                        fflush(stdout);
 928                } else {
 929                        fprintf(stderr, "Unknown command '%s'\n", buf.buf);
 930                        return 1;
 931                }
 932                strbuf_reset(&buf);
 933        } while (1);
 934
 935        http_cleanup();
 936
 937        return 0;
 938}