Andrew's git / gitweb.git / remote-curl.c
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remote-curl.con commit ident: add NO_GECOS_IN_PWENT for systems without pw_gecos in struct passwd (590e081)
   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, proto_git_candidate = 1;
 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
 125        /* try again with "plain" url (no ? or & appended) */
 126        if (http_ret != HTTP_OK) {
 127                free(refs_url);
 128                strbuf_reset(&buffer);
 129
 130                proto_git_candidate = 0;
 131                strbuf_addf(&buffer, "%s/info/refs", url);
 132                refs_url = strbuf_detach(&buffer, NULL);
 133
 134                http_ret = http_get_strbuf(refs_url, &buffer, HTTP_NO_CACHE);
 135        }
 136
 137        switch (http_ret) {
 138        case HTTP_OK:
 139                break;
 140        case HTTP_MISSING_TARGET:
 141                die("%s not found: did you run git update-server-info on the"
 142                    " server?", refs_url);
 143        default:
 144                http_error(refs_url, http_ret);
 145                die("HTTP request failed");
 146        }
 147
 148        last= xcalloc(1, sizeof(*last_discovery));
 149        last->service = service;
 150        last->buf_alloc = strbuf_detach(&buffer, &last->len);
 151        last->buf = last->buf_alloc;
 152
 153        if (is_http && proto_git_candidate
 154                && 5 <= last->len && last->buf[4] == '#') {
 155                /* smart HTTP response; validate that the service
 156                 * pkt-line matches our request.
 157                 */
 158                struct strbuf exp = STRBUF_INIT;
 159
 160                if (packet_get_line(&buffer, &last->buf, &last->len) <= 0)
 161                        die("%s has invalid packet header", refs_url);
 162                if (buffer.len && buffer.buf[buffer.len - 1] == '\n')
 163                        strbuf_setlen(&buffer, buffer.len - 1);
 164
 165                strbuf_addf(&exp, "# service=%s", service);
 166                if (strbuf_cmp(&exp, &buffer))
 167                        die("invalid server response; got '%s'", buffer.buf);
 168                strbuf_release(&exp);
 169
 170                /* The header can include additional metadata lines, up
 171                 * until a packet flush marker.  Ignore these now, but
 172                 * in the future we might start to scan them.
 173                 */
 174                strbuf_reset(&buffer);
 175                while (packet_get_line(&buffer, &last->buf, &last->len) > 0)
 176                        strbuf_reset(&buffer);
 177
 178                last->proto_git = 1;
 179        }
 180
 181        free(refs_url);
 182        strbuf_release(&buffer);
 183        last_discovery = last;
 184        return last;
 185}
 186
 187static int write_discovery(int in, int out, void *data)
 188{
 189        struct discovery *heads = data;
 190        int err = 0;
 191        if (write_in_full(out, heads->buf, heads->len) != heads->len)
 192                err = 1;
 193        close(out);
 194        return err;
 195}
 196
 197static struct ref *parse_git_refs(struct discovery *heads)
 198{
 199        struct ref *list = NULL;
 200        struct async async;
 201
 202        memset(&async, 0, sizeof(async));
 203        async.proc = write_discovery;
 204        async.data = heads;
 205        async.out = -1;
 206
 207        if (start_async(&async))
 208                die("cannot start thread to parse advertised refs");
 209        get_remote_heads(async.out, &list, 0, NULL, 0, NULL);
 210        close(async.out);
 211        if (finish_async(&async))
 212                die("ref parsing thread failed");
 213        return list;
 214}
 215
 216static struct ref *parse_info_refs(struct discovery *heads)
 217{
 218        char *data, *start, *mid;
 219        char *ref_name;
 220        int i = 0;
 221
 222        struct ref *refs = NULL;
 223        struct ref *ref = NULL;
 224        struct ref *last_ref = NULL;
 225
 226        data = heads->buf;
 227        start = NULL;
 228        mid = data;
 229        while (i < heads->len) {
 230                if (!start) {
 231                        start = &data[i];
 232                }
 233                if (data[i] == '\t')
 234                        mid = &data[i];
 235                if (data[i] == '\n') {
 236                        data[i] = 0;
 237                        ref_name = mid + 1;
 238                        ref = xmalloc(sizeof(struct ref) +
 239                                      strlen(ref_name) + 1);
 240                        memset(ref, 0, sizeof(struct ref));
 241                        strcpy(ref->name, ref_name);
 242                        get_sha1_hex(start, ref->old_sha1);
 243                        if (!refs)
 244                                refs = ref;
 245                        if (last_ref)
 246                                last_ref->next = ref;
 247                        last_ref = ref;
 248                        start = NULL;
 249                }
 250                i++;
 251        }
 252
 253        init_walker();
 254        ref = alloc_ref("HEAD");
 255        if (!walker->fetch_ref(walker, ref) &&
 256            !resolve_remote_symref(ref, refs)) {
 257                ref->next = refs;
 258                refs = ref;
 259        } else {
 260                free(ref);
 261        }
 262
 263        return refs;
 264}
 265
 266static struct ref *get_refs(int for_push)
 267{
 268        struct discovery *heads;
 269
 270        if (for_push)
 271                heads = discover_refs("git-receive-pack");
 272        else
 273                heads = discover_refs("git-upload-pack");
 274
 275        if (heads->proto_git)
 276                return parse_git_refs(heads);
 277        return parse_info_refs(heads);
 278}
 279
 280static void output_refs(struct ref *refs)
 281{
 282        struct ref *posn;
 283        for (posn = refs; posn; posn = posn->next) {
 284                if (posn->symref)
 285                        printf("@%s %s\n", posn->symref, posn->name);
 286                else
 287                        printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
 288        }
 289        printf("\n");
 290        fflush(stdout);
 291        free_refs(refs);
 292}
 293
 294struct rpc_state {
 295        const char *service_name;
 296        const char **argv;
 297        char *service_url;
 298        char *hdr_content_type;
 299        char *hdr_accept;
 300        char *buf;
 301        size_t alloc;
 302        size_t len;
 303        size_t pos;
 304        int in;
 305        int out;
 306        struct strbuf result;
 307        unsigned gzip_request : 1;
 308        unsigned initial_buffer : 1;
 309};
 310
 311static size_t rpc_out(void *ptr, size_t eltsize,
 312                size_t nmemb, void *buffer_)
 313{
 314        size_t max = eltsize * nmemb;
 315        struct rpc_state *rpc = buffer_;
 316        size_t avail = rpc->len - rpc->pos;
 317
 318        if (!avail) {
 319                rpc->initial_buffer = 0;
 320                avail = packet_read_line(rpc->out, rpc->buf, rpc->alloc);
 321                if (!avail)
 322                        return 0;
 323                rpc->pos = 0;
 324                rpc->len = avail;
 325        }
 326
 327        if (max < avail)
 328                avail = max;
 329        memcpy(ptr, rpc->buf + rpc->pos, avail);
 330        rpc->pos += avail;
 331        return avail;
 332}
 333
 334#ifndef NO_CURL_IOCTL
 335static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 336{
 337        struct rpc_state *rpc = clientp;
 338
 339        switch (cmd) {
 340        case CURLIOCMD_NOP:
 341                return CURLIOE_OK;
 342
 343        case CURLIOCMD_RESTARTREAD:
 344                if (rpc->initial_buffer) {
 345                        rpc->pos = 0;
 346                        return CURLIOE_OK;
 347                }
 348                fprintf(stderr, "Unable to rewind rpc post data - try increasing http.postBuffer\n");
 349                return CURLIOE_FAILRESTART;
 350
 351        default:
 352                return CURLIOE_UNKNOWNCMD;
 353        }
 354}
 355#endif
 356
 357static size_t rpc_in(const void *ptr, size_t eltsize,
 358                size_t nmemb, void *buffer_)
 359{
 360        size_t size = eltsize * nmemb;
 361        struct rpc_state *rpc = buffer_;
 362        write_or_die(rpc->in, ptr, size);
 363        return size;
 364}
 365
 366static int post_rpc(struct rpc_state *rpc)
 367{
 368        struct active_request_slot *slot;
 369        struct slot_results results;
 370        struct curl_slist *headers = NULL;
 371        int use_gzip = rpc->gzip_request;
 372        char *gzip_body = NULL;
 373        int err = 0, large_request = 0;
 374
 375        /* Try to load the entire request, if we can fit it into the
 376         * allocated buffer space we can use HTTP/1.0 and avoid the
 377         * chunked encoding mess.
 378         */
 379        while (1) {
 380                size_t left = rpc->alloc - rpc->len;
 381                char *buf = rpc->buf + rpc->len;
 382                int n;
 383
 384                if (left < LARGE_PACKET_MAX) {
 385                        large_request = 1;
 386                        use_gzip = 0;
 387                        break;
 388                }
 389
 390                n = packet_read_line(rpc->out, buf, left);
 391                if (!n)
 392                        break;
 393                rpc->len += n;
 394        }
 395
 396        slot = get_active_slot();
 397        slot->results = &results;
 398
 399        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 400        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 401        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 402        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
 403
 404        headers = curl_slist_append(headers, rpc->hdr_content_type);
 405        headers = curl_slist_append(headers, rpc->hdr_accept);
 406
 407        if (large_request) {
 408                /* The request body is large and the size cannot be predicted.
 409                 * We must use chunked encoding to send it.
 410                 */
 411                headers = curl_slist_append(headers, "Expect: 100-continue");
 412                headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 413                rpc->initial_buffer = 1;
 414                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 415                curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 416#ifndef NO_CURL_IOCTL
 417                curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 418                curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 419#endif
 420                if (options.verbosity > 1) {
 421                        fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 422                        fflush(stderr);
 423                }
 424
 425        } else if (use_gzip && 1024 < rpc->len) {
 426                /* The client backend isn't giving us compressed data so
 427                 * we can try to deflate it ourselves, this may save on.
 428                 * the transfer time.
 429                 */
 430                size_t size;
 431                z_stream stream;
 432                int ret;
 433
 434                memset(&stream, 0, sizeof(stream));
 435                ret = deflateInit2(&stream, Z_BEST_COMPRESSION,
 436                                Z_DEFLATED, (15 + 16),
 437                                8, Z_DEFAULT_STRATEGY);
 438                if (ret != Z_OK)
 439                        die("cannot deflate request; zlib init error %d", ret);
 440                size = deflateBound(&stream, rpc->len);
 441                gzip_body = xmalloc(size);
 442
 443                stream.next_in = (unsigned char *)rpc->buf;
 444                stream.avail_in = rpc->len;
 445                stream.next_out = (unsigned char *)gzip_body;
 446                stream.avail_out = size;
 447
 448                ret = deflate(&stream, Z_FINISH);
 449                if (ret != Z_STREAM_END)
 450                        die("cannot deflate request; zlib deflate error %d", ret);
 451
 452                ret = deflateEnd(&stream);
 453                if (ret != Z_OK)
 454                        die("cannot deflate request; zlib end error %d", ret);
 455
 456                size = stream.total_out;
 457
 458                headers = curl_slist_append(headers, "Content-Encoding: gzip");
 459                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 460                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, size);
 461
 462                if (options.verbosity > 1) {
 463                        fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 464                                rpc->service_name,
 465                                (unsigned long)rpc->len, (unsigned long)size);
 466                        fflush(stderr);
 467                }
 468        } else {
 469                /* We know the complete request size in advance, use the
 470                 * more normal Content-Length approach.
 471                 */
 472                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 473                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 474                if (options.verbosity > 1) {
 475                        fprintf(stderr, "POST %s (%lu bytes)\n",
 476                                rpc->service_name, (unsigned long)rpc->len);
 477                        fflush(stderr);
 478                }
 479        }
 480
 481        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 482        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 483        curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 484
 485        slot->curl_result = curl_easy_perform(slot->curl);
 486        finish_active_slot(slot);
 487
 488        if (results.curl_result != CURLE_OK) {
 489                err |= error("RPC failed; result=%d, HTTP code = %ld",
 490                        results.curl_result, results.http_code);
 491        }
 492
 493        curl_slist_free_all(headers);
 494        free(gzip_body);
 495        return err;
 496}
 497
 498static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 499{
 500        const char *svc = rpc->service_name;
 501        struct strbuf buf = STRBUF_INIT;
 502        struct child_process client;
 503        int err = 0;
 504
 505        init_walker();
 506        memset(&client, 0, sizeof(client));
 507        client.in = -1;
 508        client.out = -1;
 509        client.git_cmd = 1;
 510        client.argv = rpc->argv;
 511        if (start_command(&client))
 512                exit(1);
 513        if (heads)
 514                write_or_die(client.in, heads->buf, heads->len);
 515
 516        rpc->alloc = http_post_buffer;
 517        rpc->buf = xmalloc(rpc->alloc);
 518        rpc->in = client.in;
 519        rpc->out = client.out;
 520        strbuf_init(&rpc->result, 0);
 521
 522        strbuf_addf(&buf, "%s/%s", url, svc);
 523        rpc->service_url = strbuf_detach(&buf, NULL);
 524
 525        strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 526        rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 527
 528        strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 529        rpc->hdr_accept = strbuf_detach(&buf, NULL);
 530
 531        while (!err) {
 532                int n = packet_read_line(rpc->out, rpc->buf, rpc->alloc);
 533                if (!n)
 534                        break;
 535                rpc->pos = 0;
 536                rpc->len = n;
 537                err |= post_rpc(rpc);
 538        }
 539        strbuf_read(&rpc->result, client.out, 0);
 540
 541        close(client.in);
 542        close(client.out);
 543        client.in = -1;
 544        client.out = -1;
 545
 546        err |= finish_command(&client);
 547        free(rpc->service_url);
 548        free(rpc->hdr_content_type);
 549        free(rpc->hdr_accept);
 550        free(rpc->buf);
 551        strbuf_release(&buf);
 552        return err;
 553}
 554
 555static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 556{
 557        char **targets = xmalloc(nr_heads * sizeof(char*));
 558        int ret, i;
 559
 560        if (options.depth)
 561                die("dumb http transport does not support --depth");
 562        for (i = 0; i < nr_heads; i++)
 563                targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 564
 565        init_walker();
 566        walker->get_all = 1;
 567        walker->get_tree = 1;
 568        walker->get_history = 1;
 569        walker->get_verbosely = options.verbosity >= 3;
 570        walker->get_recover = 0;
 571        ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 572
 573        for (i = 0; i < nr_heads; i++)
 574                free(targets[i]);
 575        free(targets);
 576
 577        return ret ? error("Fetch failed.") : 0;
 578}
 579
 580static int fetch_git(struct discovery *heads,
 581        int nr_heads, struct ref **to_fetch)
 582{
 583        struct rpc_state rpc;
 584        char *depth_arg = NULL;
 585        const char **argv;
 586        int argc = 0, i, err;
 587
 588        argv = xmalloc((15 + nr_heads) * sizeof(char*));
 589        argv[argc++] = "fetch-pack";
 590        argv[argc++] = "--stateless-rpc";
 591        argv[argc++] = "--lock-pack";
 592        if (options.followtags)
 593                argv[argc++] = "--include-tag";
 594        if (options.thin)
 595                argv[argc++] = "--thin";
 596        if (options.verbosity >= 3) {
 597                argv[argc++] = "-v";
 598                argv[argc++] = "-v";
 599        }
 600        if (!options.progress)
 601                argv[argc++] = "--no-progress";
 602        if (options.depth) {
 603                struct strbuf buf = STRBUF_INIT;
 604                strbuf_addf(&buf, "--depth=%lu", options.depth);
 605                depth_arg = strbuf_detach(&buf, NULL);
 606                argv[argc++] = depth_arg;
 607        }
 608        argv[argc++] = url;
 609        for (i = 0; i < nr_heads; i++) {
 610                struct ref *ref = to_fetch[i];
 611                if (!ref->name || !*ref->name)
 612                        die("cannot fetch by sha1 over smart http");
 613                argv[argc++] = ref->name;
 614        }
 615        argv[argc++] = NULL;
 616
 617        memset(&rpc, 0, sizeof(rpc));
 618        rpc.service_name = "git-upload-pack",
 619        rpc.argv = argv;
 620        rpc.gzip_request = 1;
 621
 622        err = rpc_service(&rpc, heads);
 623        if (rpc.result.len)
 624                safe_write(1, rpc.result.buf, rpc.result.len);
 625        strbuf_release(&rpc.result);
 626        free(argv);
 627        free(depth_arg);
 628        return err;
 629}
 630
 631static int fetch(int nr_heads, struct ref **to_fetch)
 632{
 633        struct discovery *d = discover_refs("git-upload-pack");
 634        if (d->proto_git)
 635                return fetch_git(d, nr_heads, to_fetch);
 636        else
 637                return fetch_dumb(nr_heads, to_fetch);
 638}
 639
 640static void parse_fetch(struct strbuf *buf)
 641{
 642        struct ref **to_fetch = NULL;
 643        struct ref *list_head = NULL;
 644        struct ref **list = &list_head;
 645        int alloc_heads = 0, nr_heads = 0;
 646
 647        do {
 648                if (!prefixcmp(buf->buf, "fetch ")) {
 649                        char *p = buf->buf + strlen("fetch ");
 650                        char *name;
 651                        struct ref *ref;
 652                        unsigned char old_sha1[20];
 653
 654                        if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 655                                die("protocol error: expected sha/ref, got %s'", p);
 656                        if (p[40] == ' ')
 657                                name = p + 41;
 658                        else if (!p[40])
 659                                name = "";
 660                        else
 661                                die("protocol error: expected sha/ref, got %s'", p);
 662
 663                        ref = alloc_ref(name);
 664                        hashcpy(ref->old_sha1, old_sha1);
 665
 666                        *list = ref;
 667                        list = &ref->next;
 668
 669                        ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 670                        to_fetch[nr_heads++] = ref;
 671                }
 672                else
 673                        die("http transport does not support %s", buf->buf);
 674
 675                strbuf_reset(buf);
 676                if (strbuf_getline(buf, stdin, '\n') == EOF)
 677                        return;
 678                if (!*buf->buf)
 679                        break;
 680        } while (1);
 681
 682        if (fetch(nr_heads, to_fetch))
 683                exit(128); /* error already reported */
 684        free_refs(list_head);
 685        free(to_fetch);
 686
 687        printf("\n");
 688        fflush(stdout);
 689        strbuf_reset(buf);
 690}
 691
 692static int push_dav(int nr_spec, char **specs)
 693{
 694        const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 695        int argc = 0, i;
 696
 697        argv[argc++] = "http-push";
 698        argv[argc++] = "--helper-status";
 699        if (options.dry_run)
 700                argv[argc++] = "--dry-run";
 701        if (options.verbosity > 1)
 702                argv[argc++] = "--verbose";
 703        argv[argc++] = url;
 704        for (i = 0; i < nr_spec; i++)
 705                argv[argc++] = specs[i];
 706        argv[argc++] = NULL;
 707
 708        if (run_command_v_opt(argv, RUN_GIT_CMD))
 709                die("git-%s failed", argv[0]);
 710        free(argv);
 711        return 0;
 712}
 713
 714static int push_git(struct discovery *heads, int nr_spec, char **specs)
 715{
 716        struct rpc_state rpc;
 717        const char **argv;
 718        int argc = 0, i, err;
 719
 720        argv = xmalloc((10 + nr_spec) * sizeof(char*));
 721        argv[argc++] = "send-pack";
 722        argv[argc++] = "--stateless-rpc";
 723        argv[argc++] = "--helper-status";
 724        if (options.thin)
 725                argv[argc++] = "--thin";
 726        if (options.dry_run)
 727                argv[argc++] = "--dry-run";
 728        if (options.verbosity > 1)
 729                argv[argc++] = "--verbose";
 730        argv[argc++] = url;
 731        for (i = 0; i < nr_spec; i++)
 732                argv[argc++] = specs[i];
 733        argv[argc++] = NULL;
 734
 735        memset(&rpc, 0, sizeof(rpc));
 736        rpc.service_name = "git-receive-pack",
 737        rpc.argv = argv;
 738
 739        err = rpc_service(&rpc, heads);
 740        if (rpc.result.len)
 741                safe_write(1, rpc.result.buf, rpc.result.len);
 742        strbuf_release(&rpc.result);
 743        free(argv);
 744        return err;
 745}
 746
 747static int push(int nr_spec, char **specs)
 748{
 749        struct discovery *heads = discover_refs("git-receive-pack");
 750        int ret;
 751
 752        if (heads->proto_git)
 753                ret = push_git(heads, nr_spec, specs);
 754        else
 755                ret = push_dav(nr_spec, specs);
 756        free_discovery(heads);
 757        return ret;
 758}
 759
 760static void parse_push(struct strbuf *buf)
 761{
 762        char **specs = NULL;
 763        int alloc_spec = 0, nr_spec = 0, i;
 764
 765        do {
 766                if (!prefixcmp(buf->buf, "push ")) {
 767                        ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 768                        specs[nr_spec++] = xstrdup(buf->buf + 5);
 769                }
 770                else
 771                        die("http transport does not support %s", buf->buf);
 772
 773                strbuf_reset(buf);
 774                if (strbuf_getline(buf, stdin, '\n') == EOF)
 775                        return;
 776                if (!*buf->buf)
 777                        break;
 778        } while (1);
 779
 780        if (push(nr_spec, specs))
 781                exit(128); /* error already reported */
 782        for (i = 0; i < nr_spec; i++)
 783                free(specs[i]);
 784        free(specs);
 785
 786        printf("\n");
 787        fflush(stdout);
 788}
 789
 790int main(int argc, const char **argv)
 791{
 792        struct strbuf buf = STRBUF_INIT;
 793        int nongit;
 794
 795        git_extract_argv0_path(argv[0]);
 796        setup_git_directory_gently(&nongit);
 797        if (argc < 2) {
 798                fprintf(stderr, "Remote needed\n");
 799                return 1;
 800        }
 801
 802        options.verbosity = 1;
 803        options.progress = !!isatty(2);
 804        options.thin = 1;
 805
 806        remote = remote_get(argv[1]);
 807
 808        if (argc > 2) {
 809                url = argv[2];
 810        } else {
 811                url = remote->url[0];
 812        }
 813
 814        do {
 815                if (strbuf_getline(&buf, stdin, '\n') == EOF)
 816                        break;
 817                if (!prefixcmp(buf.buf, "fetch ")) {
 818                        if (nongit)
 819                                die("Fetch attempted without a local repo");
 820                        parse_fetch(&buf);
 821
 822                } else if (!strcmp(buf.buf, "list") || !prefixcmp(buf.buf, "list ")) {
 823                        int for_push = !!strstr(buf.buf + 4, "for-push");
 824                        output_refs(get_refs(for_push));
 825
 826                } else if (!prefixcmp(buf.buf, "push ")) {
 827                        parse_push(&buf);
 828
 829                } else if (!prefixcmp(buf.buf, "option ")) {
 830                        char *name = buf.buf + strlen("option ");
 831                        char *value = strchr(name, ' ');
 832                        int result;
 833
 834                        if (value)
 835                                *value++ = '\0';
 836                        else
 837                                value = "true";
 838
 839                        result = set_option(name, value);
 840                        if (!result)
 841                                printf("ok\n");
 842                        else if (result < 0)
 843                                printf("error invalid value\n");
 844                        else
 845                                printf("unsupported\n");
 846                        fflush(stdout);
 847
 848                } else if (!strcmp(buf.buf, "capabilities")) {
 849                        printf("fetch\n");
 850                        printf("option\n");
 851                        printf("push\n");
 852                        printf("\n");
 853                        fflush(stdout);
 854                } else {
 855                        return 1;
 856                }
 857                strbuf_reset(&buf);
 858        } while (1);
 859        return 0;
 860}