Andrew's git / gitweb.git / remote-curl.c
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remote-curl.con commit traverse_trees(): handle D/F conflict case sanely (1ee2657)
   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;
  13static struct walker *walker;
  14
  15struct options {
  16        int verbosity;
  17        unsigned long depth;
  18        unsigned progress : 1,
  19                followtags : 1,
  20                dry_run : 1,
  21                thin : 1;
  22};
  23static struct options options;
  24
  25static void init_walker(void)
  26{
  27        if (!walker)
  28                walker = get_http_walker(url, remote);
  29}
  30
  31static int set_option(const char *name, const char *value)
  32{
  33        if (!strcmp(name, "verbosity")) {
  34                char *end;
  35                int v = strtol(value, &end, 10);
  36                if (value == end || *end)
  37                        return -1;
  38                options.verbosity = v;
  39                return 0;
  40        }
  41        else if (!strcmp(name, "progress")) {
  42                if (!strcmp(value, "true"))
  43                        options.progress = 1;
  44                else if (!strcmp(value, "false"))
  45                        options.progress = 0;
  46                else
  47                        return -1;
  48                return 0;
  49        }
  50        else if (!strcmp(name, "depth")) {
  51                char *end;
  52                unsigned long v = strtoul(value, &end, 10);
  53                if (value == end || *end)
  54                        return -1;
  55                options.depth = v;
  56                return 0;
  57        }
  58        else if (!strcmp(name, "followtags")) {
  59                if (!strcmp(value, "true"))
  60                        options.followtags = 1;
  61                else if (!strcmp(value, "false"))
  62                        options.followtags = 0;
  63                else
  64                        return -1;
  65                return 0;
  66        }
  67        else if (!strcmp(name, "dry-run")) {
  68                if (!strcmp(value, "true"))
  69                        options.dry_run = 1;
  70                else if (!strcmp(value, "false"))
  71                        options.dry_run = 0;
  72                else
  73                        return -1;
  74                return 0;
  75        }
  76        else {
  77                return 1 /* unsupported */;
  78        }
  79}
  80
  81struct discovery {
  82        const char *service;
  83        char *buf_alloc;
  84        char *buf;
  85        size_t len;
  86        unsigned proto_git : 1;
  87};
  88static struct discovery *last_discovery;
  89
  90static void free_discovery(struct discovery *d)
  91{
  92        if (d) {
  93                if (d == last_discovery)
  94                        last_discovery = NULL;
  95                free(d->buf_alloc);
  96                free(d);
  97        }
  98}
  99
 100static struct discovery* discover_refs(const char *service)
 101{
 102        struct strbuf buffer = STRBUF_INIT;
 103        struct discovery *last = last_discovery;
 104        char *refs_url;
 105        int http_ret, is_http = 0;
 106
 107        if (last && !strcmp(service, last->service))
 108                return last;
 109        free_discovery(last);
 110
 111        strbuf_addf(&buffer, "%s/info/refs", url);
 112        if (!prefixcmp(url, "http://") || !prefixcmp(url, "https://")) {
 113                is_http = 1;
 114                if (!strchr(url, '?'))
 115                        strbuf_addch(&buffer, '?');
 116                else
 117                        strbuf_addch(&buffer, '&');
 118                strbuf_addf(&buffer, "service=%s", service);
 119        }
 120        refs_url = strbuf_detach(&buffer, NULL);
 121
 122        init_walker();
 123        http_ret = http_get_strbuf(refs_url, &buffer, HTTP_NO_CACHE);
 124        switch (http_ret) {
 125        case HTTP_OK:
 126                break;
 127        case HTTP_MISSING_TARGET:
 128                die("%s not found: did you run git update-server-info on the"
 129                    " server?", refs_url);
 130        default:
 131                http_error(refs_url, http_ret);
 132                die("HTTP request failed");
 133        }
 134
 135        last= xcalloc(1, sizeof(*last_discovery));
 136        last->service = service;
 137        last->buf_alloc = strbuf_detach(&buffer, &last->len);
 138        last->buf = last->buf_alloc;
 139
 140        if (is_http && 5 <= last->len && last->buf[4] == '#') {
 141                /* smart HTTP response; validate that the service
 142                 * pkt-line matches our request.
 143                 */
 144                struct strbuf exp = STRBUF_INIT;
 145
 146                if (packet_get_line(&buffer, &last->buf, &last->len) <= 0)
 147                        die("%s has invalid packet header", refs_url);
 148                if (buffer.len && buffer.buf[buffer.len - 1] == '\n')
 149                        strbuf_setlen(&buffer, buffer.len - 1);
 150
 151                strbuf_addf(&exp, "# service=%s", service);
 152                if (strbuf_cmp(&exp, &buffer))
 153                        die("invalid server response; got '%s'", buffer.buf);
 154                strbuf_release(&exp);
 155
 156                /* The header can include additional metadata lines, up
 157                 * until a packet flush marker.  Ignore these now, but
 158                 * in the future we might start to scan them.
 159                 */
 160                strbuf_reset(&buffer);
 161                while (packet_get_line(&buffer, &last->buf, &last->len) > 0)
 162                        strbuf_reset(&buffer);
 163
 164                last->proto_git = 1;
 165        }
 166
 167        free(refs_url);
 168        strbuf_release(&buffer);
 169        last_discovery = last;
 170        return last;
 171}
 172
 173static int write_discovery(int fd, void *data)
 174{
 175        struct discovery *heads = data;
 176        int err = 0;
 177        if (write_in_full(fd, heads->buf, heads->len) != heads->len)
 178                err = 1;
 179        close(fd);
 180        return err;
 181}
 182
 183static struct ref *parse_git_refs(struct discovery *heads)
 184{
 185        struct ref *list = NULL;
 186        struct async async;
 187
 188        memset(&async, 0, sizeof(async));
 189        async.proc = write_discovery;
 190        async.data = heads;
 191
 192        if (start_async(&async))
 193                die("cannot start thread to parse advertised refs");
 194        get_remote_heads(async.out, &list, 0, NULL, 0, NULL);
 195        close(async.out);
 196        if (finish_async(&async))
 197                die("ref parsing thread failed");
 198        return list;
 199}
 200
 201static struct ref *parse_info_refs(struct discovery *heads)
 202{
 203        char *data, *start, *mid;
 204        char *ref_name;
 205        int i = 0;
 206
 207        struct ref *refs = NULL;
 208        struct ref *ref = NULL;
 209        struct ref *last_ref = NULL;
 210
 211        data = heads->buf;
 212        start = NULL;
 213        mid = data;
 214        while (i < heads->len) {
 215                if (!start) {
 216                        start = &data[i];
 217                }
 218                if (data[i] == '\t')
 219                        mid = &data[i];
 220                if (data[i] == '\n') {
 221                        data[i] = 0;
 222                        ref_name = mid + 1;
 223                        ref = xmalloc(sizeof(struct ref) +
 224                                      strlen(ref_name) + 1);
 225                        memset(ref, 0, sizeof(struct ref));
 226                        strcpy(ref->name, ref_name);
 227                        get_sha1_hex(start, ref->old_sha1);
 228                        if (!refs)
 229                                refs = ref;
 230                        if (last_ref)
 231                                last_ref->next = ref;
 232                        last_ref = ref;
 233                        start = NULL;
 234                }
 235                i++;
 236        }
 237
 238        init_walker();
 239        ref = alloc_ref("HEAD");
 240        if (!walker->fetch_ref(walker, ref) &&
 241            !resolve_remote_symref(ref, refs)) {
 242                ref->next = refs;
 243                refs = ref;
 244        } else {
 245                free(ref);
 246        }
 247
 248        return refs;
 249}
 250
 251static struct ref *get_refs(int for_push)
 252{
 253        struct discovery *heads;
 254
 255        if (for_push)
 256                heads = discover_refs("git-receive-pack");
 257        else
 258                heads = discover_refs("git-upload-pack");
 259
 260        if (heads->proto_git)
 261                return parse_git_refs(heads);
 262        return parse_info_refs(heads);
 263}
 264
 265static void output_refs(struct ref *refs)
 266{
 267        struct ref *posn;
 268        for (posn = refs; posn; posn = posn->next) {
 269                if (posn->symref)
 270                        printf("@%s %s\n", posn->symref, posn->name);
 271                else
 272                        printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
 273        }
 274        printf("\n");
 275        fflush(stdout);
 276        free_refs(refs);
 277}
 278
 279struct rpc_state {
 280        const char *service_name;
 281        const char **argv;
 282        char *service_url;
 283        char *hdr_content_type;
 284        char *hdr_accept;
 285        char *buf;
 286        size_t alloc;
 287        size_t len;
 288        size_t pos;
 289        int in;
 290        int out;
 291        struct strbuf result;
 292        unsigned gzip_request : 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                avail = packet_read_line(rpc->out, rpc->buf, rpc->alloc);
 304                if (!avail)
 305                        return 0;
 306                rpc->pos = 0;
 307                rpc->len = avail;
 308        }
 309
 310        if (max < avail)
 311                avail = max;
 312        memcpy(ptr, rpc->buf + rpc->pos, avail);
 313        rpc->pos += avail;
 314        return avail;
 315}
 316
 317static size_t rpc_in(const void *ptr, size_t eltsize,
 318                size_t nmemb, void *buffer_)
 319{
 320        size_t size = eltsize * nmemb;
 321        struct rpc_state *rpc = buffer_;
 322        write_or_die(rpc->in, ptr, size);
 323        return size;
 324}
 325
 326static int post_rpc(struct rpc_state *rpc)
 327{
 328        struct active_request_slot *slot;
 329        struct slot_results results;
 330        struct curl_slist *headers = NULL;
 331        int use_gzip = rpc->gzip_request;
 332        char *gzip_body = NULL;
 333        int err = 0, large_request = 0;
 334
 335        /* Try to load the entire request, if we can fit it into the
 336         * allocated buffer space we can use HTTP/1.0 and avoid the
 337         * chunked encoding mess.
 338         */
 339        while (1) {
 340                size_t left = rpc->alloc - rpc->len;
 341                char *buf = rpc->buf + rpc->len;
 342                int n;
 343
 344                if (left < LARGE_PACKET_MAX) {
 345                        large_request = 1;
 346                        use_gzip = 0;
 347                        break;
 348                }
 349
 350                n = packet_read_line(rpc->out, buf, left);
 351                if (!n)
 352                        break;
 353                rpc->len += n;
 354        }
 355
 356        slot = get_active_slot();
 357        slot->results = &results;
 358
 359        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 360        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 361        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 362        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
 363
 364        headers = curl_slist_append(headers, rpc->hdr_content_type);
 365        headers = curl_slist_append(headers, rpc->hdr_accept);
 366
 367        if (large_request) {
 368                /* The request body is large and the size cannot be predicted.
 369                 * We must use chunked encoding to send it.
 370                 */
 371                headers = curl_slist_append(headers, "Expect: 100-continue");
 372                headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 373                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 374                curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 375                if (options.verbosity > 1) {
 376                        fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 377                        fflush(stderr);
 378                }
 379
 380        } else if (use_gzip && 1024 < rpc->len) {
 381                /* The client backend isn't giving us compressed data so
 382                 * we can try to deflate it ourselves, this may save on.
 383                 * the transfer time.
 384                 */
 385                size_t size;
 386                z_stream stream;
 387                int ret;
 388
 389                memset(&stream, 0, sizeof(stream));
 390                ret = deflateInit2(&stream, Z_BEST_COMPRESSION,
 391                                Z_DEFLATED, (15 + 16),
 392                                8, Z_DEFAULT_STRATEGY);
 393                if (ret != Z_OK)
 394                        die("cannot deflate request; zlib init error %d", ret);
 395                size = deflateBound(&stream, rpc->len);
 396                gzip_body = xmalloc(size);
 397
 398                stream.next_in = (unsigned char *)rpc->buf;
 399                stream.avail_in = rpc->len;
 400                stream.next_out = (unsigned char *)gzip_body;
 401                stream.avail_out = size;
 402
 403                ret = deflate(&stream, Z_FINISH);
 404                if (ret != Z_STREAM_END)
 405                        die("cannot deflate request; zlib deflate error %d", ret);
 406
 407                ret = deflateEnd(&stream);
 408                if (ret != Z_OK)
 409                        die("cannot deflate request; zlib end error %d", ret);
 410
 411                size = stream.total_out;
 412
 413                headers = curl_slist_append(headers, "Content-Encoding: gzip");
 414                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 415                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, size);
 416
 417                if (options.verbosity > 1) {
 418                        fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 419                                rpc->service_name,
 420                                (unsigned long)rpc->len, (unsigned long)size);
 421                        fflush(stderr);
 422                }
 423        } else {
 424                /* We know the complete request size in advance, use the
 425                 * more normal Content-Length approach.
 426                 */
 427                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 428                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 429                if (options.verbosity > 1) {
 430                        fprintf(stderr, "POST %s (%lu bytes)\n",
 431                                rpc->service_name, (unsigned long)rpc->len);
 432                        fflush(stderr);
 433                }
 434        }
 435
 436        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 437        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 438        curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 439
 440        slot->curl_result = curl_easy_perform(slot->curl);
 441        finish_active_slot(slot);
 442
 443        if (results.curl_result != CURLE_OK) {
 444                err |= error("RPC failed; result=%d, HTTP code = %ld",
 445                        results.curl_result, results.http_code);
 446        }
 447
 448        curl_slist_free_all(headers);
 449        free(gzip_body);
 450        return err;
 451}
 452
 453static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 454{
 455        const char *svc = rpc->service_name;
 456        struct strbuf buf = STRBUF_INIT;
 457        struct child_process client;
 458        int err = 0;
 459
 460        init_walker();
 461        memset(&client, 0, sizeof(client));
 462        client.in = -1;
 463        client.out = -1;
 464        client.git_cmd = 1;
 465        client.argv = rpc->argv;
 466        if (start_command(&client))
 467                exit(1);
 468        if (heads)
 469                write_or_die(client.in, heads->buf, heads->len);
 470
 471        rpc->alloc = http_post_buffer;
 472        rpc->buf = xmalloc(rpc->alloc);
 473        rpc->in = client.in;
 474        rpc->out = client.out;
 475        strbuf_init(&rpc->result, 0);
 476
 477        strbuf_addf(&buf, "%s/%s", url, svc);
 478        rpc->service_url = strbuf_detach(&buf, NULL);
 479
 480        strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 481        rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 482
 483        strbuf_addf(&buf, "Accept: application/x-%s-response", svc);
 484        rpc->hdr_accept = strbuf_detach(&buf, NULL);
 485
 486        while (!err) {
 487                int n = packet_read_line(rpc->out, rpc->buf, rpc->alloc);
 488                if (!n)
 489                        break;
 490                rpc->pos = 0;
 491                rpc->len = n;
 492                err |= post_rpc(rpc);
 493        }
 494        strbuf_read(&rpc->result, client.out, 0);
 495
 496        close(client.in);
 497        close(client.out);
 498        client.in = -1;
 499        client.out = -1;
 500
 501        err |= finish_command(&client);
 502        free(rpc->service_url);
 503        free(rpc->hdr_content_type);
 504        free(rpc->hdr_accept);
 505        free(rpc->buf);
 506        strbuf_release(&buf);
 507        return err;
 508}
 509
 510static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 511{
 512        char **targets = xmalloc(nr_heads * sizeof(char*));
 513        int ret, i;
 514
 515        if (options.depth)
 516                die("dumb http transport does not support --depth");
 517        for (i = 0; i < nr_heads; i++)
 518                targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 519
 520        init_walker();
 521        walker->get_all = 1;
 522        walker->get_tree = 1;
 523        walker->get_history = 1;
 524        walker->get_verbosely = options.verbosity >= 3;
 525        walker->get_recover = 0;
 526        ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 527
 528        for (i = 0; i < nr_heads; i++)
 529                free(targets[i]);
 530        free(targets);
 531
 532        return ret ? error("Fetch failed.") : 0;
 533}
 534
 535static int fetch_git(struct discovery *heads,
 536        int nr_heads, struct ref **to_fetch)
 537{
 538        struct rpc_state rpc;
 539        char *depth_arg = NULL;
 540        const char **argv;
 541        int argc = 0, i, err;
 542
 543        argv = xmalloc((15 + nr_heads) * sizeof(char*));
 544        argv[argc++] = "fetch-pack";
 545        argv[argc++] = "--stateless-rpc";
 546        argv[argc++] = "--lock-pack";
 547        if (options.followtags)
 548                argv[argc++] = "--include-tag";
 549        if (options.thin)
 550                argv[argc++] = "--thin";
 551        if (options.verbosity >= 3) {
 552                argv[argc++] = "-v";
 553                argv[argc++] = "-v";
 554        }
 555        if (!options.progress)
 556                argv[argc++] = "--no-progress";
 557        if (options.depth) {
 558                struct strbuf buf = STRBUF_INIT;
 559                strbuf_addf(&buf, "--depth=%lu", options.depth);
 560                depth_arg = strbuf_detach(&buf, NULL);
 561                argv[argc++] = depth_arg;
 562        }
 563        argv[argc++] = url;
 564        for (i = 0; i < nr_heads; i++) {
 565                struct ref *ref = to_fetch[i];
 566                if (!ref->name || !*ref->name)
 567                        die("cannot fetch by sha1 over smart http");
 568                argv[argc++] = ref->name;
 569        }
 570        argv[argc++] = NULL;
 571
 572        memset(&rpc, 0, sizeof(rpc));
 573        rpc.service_name = "git-upload-pack",
 574        rpc.argv = argv;
 575        rpc.gzip_request = 1;
 576
 577        err = rpc_service(&rpc, heads);
 578        if (rpc.result.len)
 579                safe_write(1, rpc.result.buf, rpc.result.len);
 580        strbuf_release(&rpc.result);
 581        free(argv);
 582        free(depth_arg);
 583        return err;
 584}
 585
 586static int fetch(int nr_heads, struct ref **to_fetch)
 587{
 588        struct discovery *d = discover_refs("git-upload-pack");
 589        if (d->proto_git)
 590                return fetch_git(d, nr_heads, to_fetch);
 591        else
 592                return fetch_dumb(nr_heads, to_fetch);
 593}
 594
 595static void parse_fetch(struct strbuf *buf)
 596{
 597        struct ref **to_fetch = NULL;
 598        struct ref *list_head = NULL;
 599        struct ref **list = &list_head;
 600        int alloc_heads = 0, nr_heads = 0;
 601
 602        do {
 603                if (!prefixcmp(buf->buf, "fetch ")) {
 604                        char *p = buf->buf + strlen("fetch ");
 605                        char *name;
 606                        struct ref *ref;
 607                        unsigned char old_sha1[20];
 608
 609                        if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 610                                die("protocol error: expected sha/ref, got %s'", p);
 611                        if (p[40] == ' ')
 612                                name = p + 41;
 613                        else if (!p[40])
 614                                name = "";
 615                        else
 616                                die("protocol error: expected sha/ref, got %s'", p);
 617
 618                        ref = alloc_ref(name);
 619                        hashcpy(ref->old_sha1, old_sha1);
 620
 621                        *list = ref;
 622                        list = &ref->next;
 623
 624                        ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 625                        to_fetch[nr_heads++] = ref;
 626                }
 627                else
 628                        die("http transport does not support %s", buf->buf);
 629
 630                strbuf_reset(buf);
 631                if (strbuf_getline(buf, stdin, '\n') == EOF)
 632                        return;
 633                if (!*buf->buf)
 634                        break;
 635        } while (1);
 636
 637        if (fetch(nr_heads, to_fetch))
 638                exit(128); /* error already reported */
 639        free_refs(list_head);
 640        free(to_fetch);
 641
 642        printf("\n");
 643        fflush(stdout);
 644        strbuf_reset(buf);
 645}
 646
 647static int push_dav(int nr_spec, char **specs)
 648{
 649        const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 650        int argc = 0, i;
 651
 652        argv[argc++] = "http-push";
 653        argv[argc++] = "--helper-status";
 654        if (options.dry_run)
 655                argv[argc++] = "--dry-run";
 656        if (options.verbosity > 1)
 657                argv[argc++] = "--verbose";
 658        argv[argc++] = url;
 659        for (i = 0; i < nr_spec; i++)
 660                argv[argc++] = specs[i];
 661        argv[argc++] = NULL;
 662
 663        if (run_command_v_opt(argv, RUN_GIT_CMD))
 664                die("git-%s failed", argv[0]);
 665        free(argv);
 666        return 0;
 667}
 668
 669static int push_git(struct discovery *heads, int nr_spec, char **specs)
 670{
 671        struct rpc_state rpc;
 672        const char **argv;
 673        int argc = 0, i, err;
 674
 675        argv = xmalloc((10 + nr_spec) * sizeof(char*));
 676        argv[argc++] = "send-pack";
 677        argv[argc++] = "--stateless-rpc";
 678        argv[argc++] = "--helper-status";
 679        if (options.thin)
 680                argv[argc++] = "--thin";
 681        if (options.dry_run)
 682                argv[argc++] = "--dry-run";
 683        if (options.verbosity > 1)
 684                argv[argc++] = "--verbose";
 685        argv[argc++] = url;
 686        for (i = 0; i < nr_spec; i++)
 687                argv[argc++] = specs[i];
 688        argv[argc++] = NULL;
 689
 690        memset(&rpc, 0, sizeof(rpc));
 691        rpc.service_name = "git-receive-pack",
 692        rpc.argv = argv;
 693
 694        err = rpc_service(&rpc, heads);
 695        if (rpc.result.len)
 696                safe_write(1, rpc.result.buf, rpc.result.len);
 697        strbuf_release(&rpc.result);
 698        free(argv);
 699        return err;
 700}
 701
 702static int push(int nr_spec, char **specs)
 703{
 704        struct discovery *heads = discover_refs("git-receive-pack");
 705        int ret;
 706
 707        if (heads->proto_git)
 708                ret = push_git(heads, nr_spec, specs);
 709        else
 710                ret = push_dav(nr_spec, specs);
 711        free_discovery(heads);
 712        return ret;
 713}
 714
 715static void parse_push(struct strbuf *buf)
 716{
 717        char **specs = NULL;
 718        int alloc_spec = 0, nr_spec = 0, i;
 719
 720        do {
 721                if (!prefixcmp(buf->buf, "push ")) {
 722                        ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 723                        specs[nr_spec++] = xstrdup(buf->buf + 5);
 724                }
 725                else
 726                        die("http transport does not support %s", buf->buf);
 727
 728                strbuf_reset(buf);
 729                if (strbuf_getline(buf, stdin, '\n') == EOF)
 730                        return;
 731                if (!*buf->buf)
 732                        break;
 733        } while (1);
 734
 735        if (push(nr_spec, specs))
 736                exit(128); /* error already reported */
 737        for (i = 0; i < nr_spec; i++)
 738                free(specs[i]);
 739        free(specs);
 740
 741        printf("\n");
 742        fflush(stdout);
 743}
 744
 745int main(int argc, const char **argv)
 746{
 747        struct strbuf buf = STRBUF_INIT;
 748        int nongit;
 749
 750        git_extract_argv0_path(argv[0]);
 751        setup_git_directory_gently(&nongit);
 752        if (argc < 2) {
 753                fprintf(stderr, "Remote needed\n");
 754                return 1;
 755        }
 756
 757        options.verbosity = 1;
 758        options.progress = !!isatty(2);
 759        options.thin = 1;
 760
 761        remote = remote_get(argv[1]);
 762
 763        if (argc > 2) {
 764                url = argv[2];
 765        } else {
 766                url = remote->url[0];
 767        }
 768
 769        do {
 770                if (strbuf_getline(&buf, stdin, '\n') == EOF)
 771                        break;
 772                if (!prefixcmp(buf.buf, "fetch ")) {
 773                        if (nongit)
 774                                die("Fetch attempted without a local repo");
 775                        parse_fetch(&buf);
 776
 777                } else if (!strcmp(buf.buf, "list") || !prefixcmp(buf.buf, "list ")) {
 778                        int for_push = !!strstr(buf.buf + 4, "for-push");
 779                        output_refs(get_refs(for_push));
 780
 781                } else if (!prefixcmp(buf.buf, "push ")) {
 782                        parse_push(&buf);
 783
 784                } else if (!prefixcmp(buf.buf, "option ")) {
 785                        char *name = buf.buf + strlen("option ");
 786                        char *value = strchr(name, ' ');
 787                        int result;
 788
 789                        if (value)
 790                                *value++ = '\0';
 791                        else
 792                                value = "true";
 793
 794                        result = set_option(name, value);
 795                        if (!result)
 796                                printf("ok\n");
 797                        else if (result < 0)
 798                                printf("error invalid value\n");
 799                        else
 800                                printf("unsupported\n");
 801                        fflush(stdout);
 802
 803                } else if (!strcmp(buf.buf, "capabilities")) {
 804                        printf("fetch\n");
 805                        printf("option\n");
 806                        printf("push\n");
 807                        printf("\n");
 808                        fflush(stdout);
 809                } else {
 810                        return 1;
 811                }
 812                strbuf_reset(&buf);
 813        } while (1);
 814        return 0;
 815}