Andrew's git - gitweb.git/blob

832f441b1597682ac27b9a3069c51260c5424c09
   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 exp = STRBUF_INIT;
  96        struct strbuf type = STRBUF_INIT;
  97        struct strbuf buffer = STRBUF_INIT;
  98        struct discovery *last = last_discovery;
  99        char *refs_url;
 100        int http_ret, maybe_smart = 0;
 101
 102        if (last && !strcmp(service, last->service))
 103                return last;
 104        free_discovery(last);
 105
 106        strbuf_addf(&buffer, "%sinfo/refs", url);
 107        if ((!prefixcmp(url, "http://") || !prefixcmp(url, "https://")) &&
 108             git_env_bool("GIT_SMART_HTTP", 1)) {
 109                maybe_smart = 1;
 110                if (!strchr(url, '?'))
 111                        strbuf_addch(&buffer, '?');
 112                else
 113                        strbuf_addch(&buffer, '&');
 114                strbuf_addf(&buffer, "service=%s", service);
 115        }
 116        refs_url = strbuf_detach(&buffer, NULL);
 117
 118        http_ret = http_get_strbuf(refs_url, &type, &buffer, HTTP_NO_CACHE);
 119        switch (http_ret) {
 120        case HTTP_OK:
 121                break;
 122        case HTTP_MISSING_TARGET:
 123                die("%s not found: did you run git update-server-info on the"
 124                    " server?", refs_url);
 125        case HTTP_NOAUTH:
 126                die("Authentication failed");
 127        default:
 128                http_error(refs_url, http_ret);
 129                die("HTTP request failed");
 130        }
 131
 132        last= xcalloc(1, sizeof(*last_discovery));
 133        last->service = service;
 134        last->buf_alloc = strbuf_detach(&buffer, &last->len);
 135        last->buf = last->buf_alloc;
 136
 137        strbuf_addf(&exp, "application/x-%s-advertisement", service);
 138        if (maybe_smart &&
 139            (5 <= last->len && last->buf[4] == '#') &&
 140            !strbuf_cmp(&exp, &type)) {
 141                char *line;
 142
 143                /*
 144                 * smart HTTP response; validate that the service
 145                 * pkt-line matches our request.
 146                 */
 147                line = packet_read_line_buf(&last->buf, &last->len, NULL);
 148
 149                strbuf_reset(&exp);
 150                strbuf_addf(&exp, "# service=%s", service);
 151                if (strcmp(line, exp.buf))
 152                        die("invalid server response; got '%s'", line);
 153                strbuf_release(&exp);
 154
 155                /* The header can include additional metadata lines, up
 156                 * until a packet flush marker.  Ignore these now, but
 157                 * in the future we might start to scan them.
 158                 */
 159                while (packet_read_line_buf(&last->buf, &last->len, NULL))
 160                        ;
 161
 162                last->proto_git = 1;
 163        }
 164
 165        free(refs_url);
 166        strbuf_release(&exp);
 167        strbuf_release(&type);
 168        strbuf_release(&buffer);
 169        last_discovery = last;
 170        return last;
 171}
 172
 173static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 174{
 175        struct ref *list = NULL;
 176        get_remote_heads(-1, heads->buf, heads->len, &list,
 177                         for_push ? REF_NORMAL : 0, NULL);
 178        return list;
 179}
 180
 181static struct ref *parse_info_refs(struct discovery *heads)
 182{
 183        char *data, *start, *mid;
 184        char *ref_name;
 185        int i = 0;
 186
 187        struct ref *refs = NULL;
 188        struct ref *ref = NULL;
 189        struct ref *last_ref = NULL;
 190
 191        data = heads->buf;
 192        start = NULL;
 193        mid = data;
 194        while (i < heads->len) {
 195                if (!start) {
 196                        start = &data[i];
 197                }
 198                if (data[i] == '\t')
 199                        mid = &data[i];
 200                if (data[i] == '\n') {
 201                        if (mid - start != 40)
 202                                die("%sinfo/refs not valid: is this a git repository?", url);
 203                        data[i] = 0;
 204                        ref_name = mid + 1;
 205                        ref = xmalloc(sizeof(struct ref) +
 206                                      strlen(ref_name) + 1);
 207                        memset(ref, 0, sizeof(struct ref));
 208                        strcpy(ref->name, ref_name);
 209                        get_sha1_hex(start, ref->old_sha1);
 210                        if (!refs)
 211                                refs = ref;
 212                        if (last_ref)
 213                                last_ref->next = ref;
 214                        last_ref = ref;
 215                        start = NULL;
 216                }
 217                i++;
 218        }
 219
 220        ref = alloc_ref("HEAD");
 221        if (!http_fetch_ref(url, ref) &&
 222            !resolve_remote_symref(ref, refs)) {
 223                ref->next = refs;
 224                refs = ref;
 225        } else {
 226                free(ref);
 227        }
 228
 229        return refs;
 230}
 231
 232static struct ref *get_refs(int for_push)
 233{
 234        struct discovery *heads;
 235
 236        if (for_push)
 237                heads = discover_refs("git-receive-pack");
 238        else
 239                heads = discover_refs("git-upload-pack");
 240
 241        if (heads->proto_git)
 242                return parse_git_refs(heads, for_push);
 243        return parse_info_refs(heads);
 244}
 245
 246static void output_refs(struct ref *refs)
 247{
 248        struct ref *posn;
 249        for (posn = refs; posn; posn = posn->next) {
 250                if (posn->symref)
 251                        printf("@%s %s\n", posn->symref, posn->name);
 252                else
 253                        printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
 254        }
 255        printf("\n");
 256        fflush(stdout);
 257        free_refs(refs);
 258}
 259
 260struct rpc_state {
 261        const char *service_name;
 262        const char **argv;
 263        struct strbuf *stdin_preamble;
 264        char *service_url;
 265        char *hdr_content_type;
 266        char *hdr_accept;
 267        char *buf;
 268        size_t alloc;
 269        size_t len;
 270        size_t pos;
 271        int in;
 272        int out;
 273        struct strbuf result;
 274        unsigned gzip_request : 1;
 275        unsigned initial_buffer : 1;
 276};
 277
 278static size_t rpc_out(void *ptr, size_t eltsize,
 279                size_t nmemb, void *buffer_)
 280{
 281        size_t max = eltsize * nmemb;
 282        struct rpc_state *rpc = buffer_;
 283        size_t avail = rpc->len - rpc->pos;
 284
 285        if (!avail) {
 286                rpc->initial_buffer = 0;
 287                avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 288                if (!avail)
 289                        return 0;
 290                rpc->pos = 0;
 291                rpc->len = avail;
 292        }
 293
 294        if (max < avail)
 295                avail = max;
 296        memcpy(ptr, rpc->buf + rpc->pos, avail);
 297        rpc->pos += avail;
 298        return avail;
 299}
 300
 301#ifndef NO_CURL_IOCTL
 302static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 303{
 304        struct rpc_state *rpc = clientp;
 305
 306        switch (cmd) {
 307        case CURLIOCMD_NOP:
 308                return CURLIOE_OK;
 309
 310        case CURLIOCMD_RESTARTREAD:
 311                if (rpc->initial_buffer) {
 312                        rpc->pos = 0;
 313                        return CURLIOE_OK;
 314                }
 315                fprintf(stderr, "Unable to rewind rpc post data - try increasing http.postBuffer\n");
 316                return CURLIOE_FAILRESTART;
 317
 318        default:
 319                return CURLIOE_UNKNOWNCMD;
 320        }
 321}
 322#endif
 323
 324static size_t rpc_in(char *ptr, size_t eltsize,
 325                size_t nmemb, void *buffer_)
 326{
 327        size_t size = eltsize * nmemb;
 328        struct rpc_state *rpc = buffer_;
 329        write_or_die(rpc->in, ptr, size);
 330        return size;
 331}
 332
 333static int run_slot(struct active_request_slot *slot)
 334{
 335        int err;
 336        struct slot_results results;
 337
 338        slot->results = &results;
 339        slot->curl_result = curl_easy_perform(slot->curl);
 340        finish_active_slot(slot);
 341
 342        err = handle_curl_result(&results);
 343        if (err != HTTP_OK && err != HTTP_REAUTH) {
 344                error("RPC failed; result=%d, HTTP code = %ld",
 345                      results.curl_result, results.http_code);
 346        }
 347
 348        return err;
 349}
 350
 351static int probe_rpc(struct rpc_state *rpc)
 352{
 353        struct active_request_slot *slot;
 354        struct curl_slist *headers = NULL;
 355        struct strbuf buf = STRBUF_INIT;
 356        int err;
 357
 358        slot = get_active_slot();
 359
 360        headers = curl_slist_append(headers, rpc->hdr_content_type);
 361        headers = curl_slist_append(headers, rpc->hdr_accept);
 362
 363        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 364        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 365        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 366        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 367        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 368        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 369        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 370        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 371        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 372
 373        err = run_slot(slot);
 374
 375        curl_slist_free_all(headers);
 376        strbuf_release(&buf);
 377        return err;
 378}
 379
 380static int post_rpc(struct rpc_state *rpc)
 381{
 382        struct active_request_slot *slot;
 383        struct curl_slist *headers = NULL;
 384        int use_gzip = rpc->gzip_request;
 385        char *gzip_body = NULL;
 386        size_t gzip_size = 0;
 387        int err, large_request = 0;
 388
 389        /* Try to load the entire request, if we can fit it into the
 390         * allocated buffer space we can use HTTP/1.0 and avoid the
 391         * chunked encoding mess.
 392         */
 393        while (1) {
 394                size_t left = rpc->alloc - rpc->len;
 395                char *buf = rpc->buf + rpc->len;
 396                int n;
 397
 398                if (left < LARGE_PACKET_MAX) {
 399                        large_request = 1;
 400                        use_gzip = 0;
 401                        break;
 402                }
 403
 404                n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 405                if (!n)
 406                        break;
 407                rpc->len += n;
 408        }
 409
 410        if (large_request) {
 411                do {
 412                        err = probe_rpc(rpc);
 413                } while (err == HTTP_REAUTH);
 414                if (err != HTTP_OK)
 415                        return -1;
 416        }
 417
 418        headers = curl_slist_append(headers, rpc->hdr_content_type);
 419        headers = curl_slist_append(headers, rpc->hdr_accept);
 420        headers = curl_slist_append(headers, "Expect:");
 421
 422retry:
 423        slot = get_active_slot();
 424
 425        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 426        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 427        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 428        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 429
 430        if (large_request) {
 431                /* The request body is large and the size cannot be predicted.
 432                 * We must use chunked encoding to send it.
 433                 */
 434                headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 435                rpc->initial_buffer = 1;
 436                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 437                curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 438#ifndef NO_CURL_IOCTL
 439                curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 440                curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 441#endif
 442                if (options.verbosity > 1) {
 443                        fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 444                        fflush(stderr);
 445                }
 446
 447        } else if (gzip_body) {
 448                /*
 449                 * If we are looping to retry authentication, then the previous
 450                 * run will have set up the headers and gzip buffer already,
 451                 * and we just need to send it.
 452                 */
 453                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 454                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 455
 456        } else if (use_gzip && 1024 < rpc->len) {
 457                /* The client backend isn't giving us compressed data so
 458                 * we can try to deflate it ourselves, this may save on.
 459                 * the transfer time.
 460                 */
 461                git_zstream stream;
 462                int ret;
 463
 464                memset(&stream, 0, sizeof(stream));
 465                git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 466                gzip_size = git_deflate_bound(&stream, rpc->len);
 467                gzip_body = xmalloc(gzip_size);
 468
 469                stream.next_in = (unsigned char *)rpc->buf;
 470                stream.avail_in = rpc->len;
 471                stream.next_out = (unsigned char *)gzip_body;
 472                stream.avail_out = gzip_size;
 473
 474                ret = git_deflate(&stream, Z_FINISH);
 475                if (ret != Z_STREAM_END)
 476                        die("cannot deflate request; zlib deflate error %d", ret);
 477
 478                ret = git_deflate_end_gently(&stream);
 479                if (ret != Z_OK)
 480                        die("cannot deflate request; zlib end error %d", ret);
 481
 482                gzip_size = stream.total_out;
 483
 484                headers = curl_slist_append(headers, "Content-Encoding: gzip");
 485                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 486                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 487
 488                if (options.verbosity > 1) {
 489                        fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 490                                rpc->service_name,
 491                                (unsigned long)rpc->len, (unsigned long)gzip_size);
 492                        fflush(stderr);
 493                }
 494        } else {
 495                /* We know the complete request size in advance, use the
 496                 * more normal Content-Length approach.
 497                 */
 498                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 499                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 500                if (options.verbosity > 1) {
 501                        fprintf(stderr, "POST %s (%lu bytes)\n",
 502                                rpc->service_name, (unsigned long)rpc->len);
 503                        fflush(stderr);
 504                }
 505        }
 506
 507        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 508        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 509        curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 510
 511        err = run_slot(slot);
 512        if (err == HTTP_REAUTH && !large_request)
 513                goto retry;
 514        if (err != HTTP_OK)
 515                err = -1;
 516
 517        curl_slist_free_all(headers);
 518        free(gzip_body);
 519        return err;
 520}
 521
 522static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 523{
 524        const char *svc = rpc->service_name;
 525        struct strbuf buf = STRBUF_INIT;
 526        struct strbuf *preamble = rpc->stdin_preamble;
 527        struct child_process client;
 528        int err = 0;
 529
 530        memset(&client, 0, sizeof(client));
 531        client.in = -1;
 532        client.out = -1;
 533        client.git_cmd = 1;
 534        client.argv = rpc->argv;
 535        if (start_command(&client))
 536                exit(1);
 537        if (preamble)
 538                write_or_die(client.in, preamble->buf, preamble->len);
 539        if (heads)
 540                write_or_die(client.in, heads->buf, heads->len);
 541
 542        rpc->alloc = http_post_buffer;
 543        rpc->buf = xmalloc(rpc->alloc);
 544        rpc->in = client.in;
 545        rpc->out = client.out;
 546        strbuf_init(&rpc->result, 0);
 547
 548        strbuf_addf(&buf, "%s%s", url, svc);
 549        rpc->service_url = strbuf_detach(&buf, NULL);
 550
 551        strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 552        rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 553
 554        strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 555        rpc->hdr_accept = strbuf_detach(&buf, NULL);
 556
 557        while (!err) {
 558                int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 559                if (!n)
 560                        break;
 561                rpc->pos = 0;
 562                rpc->len = n;
 563                err |= post_rpc(rpc);
 564        }
 565
 566        close(client.in);
 567        client.in = -1;
 568        if (!err) {
 569                strbuf_read(&rpc->result, client.out, 0);
 570        } else {
 571                char buf[4096];
 572                for (;;)
 573                        if (xread(client.out, buf, sizeof(buf)) <= 0)
 574                                break;
 575        }
 576
 577        close(client.out);
 578        client.out = -1;
 579
 580        err |= finish_command(&client);
 581        free(rpc->service_url);
 582        free(rpc->hdr_content_type);
 583        free(rpc->hdr_accept);
 584        free(rpc->buf);
 585        strbuf_release(&buf);
 586        return err;
 587}
 588
 589static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 590{
 591        struct walker *walker;
 592        char **targets = xmalloc(nr_heads * sizeof(char*));
 593        int ret, i;
 594
 595        if (options.depth)
 596                die("dumb http transport does not support --depth");
 597        for (i = 0; i < nr_heads; i++)
 598                targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 599
 600        walker = get_http_walker(url);
 601        walker->get_all = 1;
 602        walker->get_tree = 1;
 603        walker->get_history = 1;
 604        walker->get_verbosely = options.verbosity >= 3;
 605        walker->get_recover = 0;
 606        ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 607        walker_free(walker);
 608
 609        for (i = 0; i < nr_heads; i++)
 610                free(targets[i]);
 611        free(targets);
 612
 613        return ret ? error("Fetch failed.") : 0;
 614}
 615
 616static int fetch_git(struct discovery *heads,
 617        int nr_heads, struct ref **to_fetch)
 618{
 619        struct rpc_state rpc;
 620        struct strbuf preamble = STRBUF_INIT;
 621        char *depth_arg = NULL;
 622        int argc = 0, i, err;
 623        const char *argv[15];
 624
 625        argv[argc++] = "fetch-pack";
 626        argv[argc++] = "--stateless-rpc";
 627        argv[argc++] = "--stdin";
 628        argv[argc++] = "--lock-pack";
 629        if (options.followtags)
 630                argv[argc++] = "--include-tag";
 631        if (options.thin)
 632                argv[argc++] = "--thin";
 633        if (options.verbosity >= 3) {
 634                argv[argc++] = "-v";
 635                argv[argc++] = "-v";
 636        }
 637        if (!options.progress)
 638                argv[argc++] = "--no-progress";
 639        if (options.depth) {
 640                struct strbuf buf = STRBUF_INIT;
 641                strbuf_addf(&buf, "--depth=%lu", options.depth);
 642                depth_arg = strbuf_detach(&buf, NULL);
 643                argv[argc++] = depth_arg;
 644        }
 645        argv[argc++] = url;
 646        argv[argc++] = NULL;
 647
 648        for (i = 0; i < nr_heads; i++) {
 649                struct ref *ref = to_fetch[i];
 650                if (!ref->name || !*ref->name)
 651                        die("cannot fetch by sha1 over smart http");
 652                packet_buf_write(&preamble, "%s\n", ref->name);
 653        }
 654        packet_buf_flush(&preamble);
 655
 656        memset(&rpc, 0, sizeof(rpc));
 657        rpc.service_name = "git-upload-pack",
 658        rpc.argv = argv;
 659        rpc.stdin_preamble = &preamble;
 660        rpc.gzip_request = 1;
 661
 662        err = rpc_service(&rpc, heads);
 663        if (rpc.result.len)
 664                write_or_die(1, rpc.result.buf, rpc.result.len);
 665        strbuf_release(&rpc.result);
 666        strbuf_release(&preamble);
 667        free(depth_arg);
 668        return err;
 669}
 670
 671static int fetch(int nr_heads, struct ref **to_fetch)
 672{
 673        struct discovery *d = discover_refs("git-upload-pack");
 674        if (d->proto_git)
 675                return fetch_git(d, nr_heads, to_fetch);
 676        else
 677                return fetch_dumb(nr_heads, to_fetch);
 678}
 679
 680static void parse_fetch(struct strbuf *buf)
 681{
 682        struct ref **to_fetch = NULL;
 683        struct ref *list_head = NULL;
 684        struct ref **list = &list_head;
 685        int alloc_heads = 0, nr_heads = 0;
 686
 687        do {
 688                if (!prefixcmp(buf->buf, "fetch ")) {
 689                        char *p = buf->buf + strlen("fetch ");
 690                        char *name;
 691                        struct ref *ref;
 692                        unsigned char old_sha1[20];
 693
 694                        if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 695                                die("protocol error: expected sha/ref, got %s'", p);
 696                        if (p[40] == ' ')
 697                                name = p + 41;
 698                        else if (!p[40])
 699                                name = "";
 700                        else
 701                                die("protocol error: expected sha/ref, got %s'", p);
 702
 703                        ref = alloc_ref(name);
 704                        hashcpy(ref->old_sha1, old_sha1);
 705
 706                        *list = ref;
 707                        list = &ref->next;
 708
 709                        ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 710                        to_fetch[nr_heads++] = ref;
 711                }
 712                else
 713                        die("http transport does not support %s", buf->buf);
 714
 715                strbuf_reset(buf);
 716                if (strbuf_getline(buf, stdin, '\n') == EOF)
 717                        return;
 718                if (!*buf->buf)
 719                        break;
 720        } while (1);
 721
 722        if (fetch(nr_heads, to_fetch))
 723                exit(128); /* error already reported */
 724        free_refs(list_head);
 725        free(to_fetch);
 726
 727        printf("\n");
 728        fflush(stdout);
 729        strbuf_reset(buf);
 730}
 731
 732static int push_dav(int nr_spec, char **specs)
 733{
 734        const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 735        int argc = 0, i;
 736
 737        argv[argc++] = "http-push";
 738        argv[argc++] = "--helper-status";
 739        if (options.dry_run)
 740                argv[argc++] = "--dry-run";
 741        if (options.verbosity > 1)
 742                argv[argc++] = "--verbose";
 743        argv[argc++] = url;
 744        for (i = 0; i < nr_spec; i++)
 745                argv[argc++] = specs[i];
 746        argv[argc++] = NULL;
 747
 748        if (run_command_v_opt(argv, RUN_GIT_CMD))
 749                die("git-%s failed", argv[0]);
 750        free(argv);
 751        return 0;
 752}
 753
 754static int push_git(struct discovery *heads, int nr_spec, char **specs)
 755{
 756        struct rpc_state rpc;
 757        const char **argv;
 758        int argc = 0, i, err;
 759
 760        argv = xmalloc((10 + nr_spec) * sizeof(char*));
 761        argv[argc++] = "send-pack";
 762        argv[argc++] = "--stateless-rpc";
 763        argv[argc++] = "--helper-status";
 764        if (options.thin)
 765                argv[argc++] = "--thin";
 766        if (options.dry_run)
 767                argv[argc++] = "--dry-run";
 768        if (options.verbosity == 0)
 769                argv[argc++] = "--quiet";
 770        else if (options.verbosity > 1)
 771                argv[argc++] = "--verbose";
 772        argv[argc++] = options.progress ? "--progress" : "--no-progress";
 773        argv[argc++] = url;
 774        for (i = 0; i < nr_spec; i++)
 775                argv[argc++] = specs[i];
 776        argv[argc++] = NULL;
 777
 778        memset(&rpc, 0, sizeof(rpc));
 779        rpc.service_name = "git-receive-pack",
 780        rpc.argv = argv;
 781
 782        err = rpc_service(&rpc, heads);
 783        if (rpc.result.len)
 784                write_or_die(1, rpc.result.buf, rpc.result.len);
 785        strbuf_release(&rpc.result);
 786        free(argv);
 787        return err;
 788}
 789
 790static int push(int nr_spec, char **specs)
 791{
 792        struct discovery *heads = discover_refs("git-receive-pack");
 793        int ret;
 794
 795        if (heads->proto_git)
 796                ret = push_git(heads, nr_spec, specs);
 797        else
 798                ret = push_dav(nr_spec, specs);
 799        free_discovery(heads);
 800        return ret;
 801}
 802
 803static void parse_push(struct strbuf *buf)
 804{
 805        char **specs = NULL;
 806        int alloc_spec = 0, nr_spec = 0, i, ret;
 807
 808        do {
 809                if (!prefixcmp(buf->buf, "push ")) {
 810                        ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 811                        specs[nr_spec++] = xstrdup(buf->buf + 5);
 812                }
 813                else
 814                        die("http transport does not support %s", buf->buf);
 815
 816                strbuf_reset(buf);
 817                if (strbuf_getline(buf, stdin, '\n') == EOF)
 818                        goto free_specs;
 819                if (!*buf->buf)
 820                        break;
 821        } while (1);
 822
 823        ret = push(nr_spec, specs);
 824        printf("\n");
 825        fflush(stdout);
 826
 827        if (ret)
 828                exit(128); /* error already reported */
 829
 830 free_specs:
 831        for (i = 0; i < nr_spec; i++)
 832                free(specs[i]);
 833        free(specs);
 834}
 835
 836int main(int argc, const char **argv)
 837{
 838        struct strbuf buf = STRBUF_INIT;
 839        int nongit;
 840
 841        git_extract_argv0_path(argv[0]);
 842        setup_git_directory_gently(&nongit);
 843        if (argc < 2) {
 844                fprintf(stderr, "Remote needed\n");
 845                return 1;
 846        }
 847
 848        options.verbosity = 1;
 849        options.progress = !!isatty(2);
 850        options.thin = 1;
 851
 852        remote = remote_get(argv[1]);
 853
 854        if (argc > 2) {
 855                end_url_with_slash(&buf, argv[2]);
 856        } else {
 857                end_url_with_slash(&buf, remote->url[0]);
 858        }
 859
 860        url = strbuf_detach(&buf, NULL);
 861
 862        http_init(remote, url, 0);
 863
 864        do {
 865                if (strbuf_getline(&buf, stdin, '\n') == EOF) {
 866                        if (ferror(stdin))
 867                                fprintf(stderr, "Error reading command stream\n");
 868                        else
 869                                fprintf(stderr, "Unexpected end of command stream\n");
 870                        return 1;
 871                }
 872                if (buf.len == 0)
 873                        break;
 874                if (!prefixcmp(buf.buf, "fetch ")) {
 875                        if (nongit)
 876                                die("Fetch attempted without a local repo");
 877                        parse_fetch(&buf);
 878
 879                } else if (!strcmp(buf.buf, "list") || !prefixcmp(buf.buf, "list ")) {
 880                        int for_push = !!strstr(buf.buf + 4, "for-push");
 881                        output_refs(get_refs(for_push));
 882
 883                } else if (!prefixcmp(buf.buf, "push ")) {
 884                        parse_push(&buf);
 885
 886                } else if (!prefixcmp(buf.buf, "option ")) {
 887                        char *name = buf.buf + strlen("option ");
 888                        char *value = strchr(name, ' ');
 889                        int result;
 890
 891                        if (value)
 892                                *value++ = '\0';
 893                        else
 894                                value = "true";
 895
 896                        result = set_option(name, value);
 897                        if (!result)
 898                                printf("ok\n");
 899                        else if (result < 0)
 900                                printf("error invalid value\n");
 901                        else
 902                                printf("unsupported\n");
 903                        fflush(stdout);
 904
 905                } else if (!strcmp(buf.buf, "capabilities")) {
 906                        printf("fetch\n");
 907                        printf("option\n");
 908                        printf("push\n");
 909                        printf("\n");
 910                        fflush(stdout);
 911                } else {
 912                        fprintf(stderr, "Unknown command '%s'\n", buf.buf);
 913                        return 1;
 914                }
 915                strbuf_reset(&buf);
 916        } while (1);
 917
 918        http_cleanup();
 919
 920        return 0;
 921}