Andrew's git / gitweb.git / remote-curl.c
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remote-curl.con commit push: teach --force-with-lease to smart-http transport (05c1eb1)
   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 "string-list.h"
  10#include "sideband.h"
  11
  12static struct remote *remote;
  13static const char *url; /* always ends with a trailing slash */
  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;
  24static struct string_list cas_options = STRING_LIST_INIT_DUP;
  25
  26static int set_option(const char *name, const char *value)
  27{
  28        if (!strcmp(name, "verbosity")) {
  29                char *end;
  30                int v = strtol(value, &end, 10);
  31                if (value == end || *end)
  32                        return -1;
  33                options.verbosity = v;
  34                return 0;
  35        }
  36        else if (!strcmp(name, "progress")) {
  37                if (!strcmp(value, "true"))
  38                        options.progress = 1;
  39                else if (!strcmp(value, "false"))
  40                        options.progress = 0;
  41                else
  42                        return -1;
  43                return 0;
  44        }
  45        else if (!strcmp(name, "depth")) {
  46                char *end;
  47                unsigned long v = strtoul(value, &end, 10);
  48                if (value == end || *end)
  49                        return -1;
  50                options.depth = v;
  51                return 0;
  52        }
  53        else if (!strcmp(name, "followtags")) {
  54                if (!strcmp(value, "true"))
  55                        options.followtags = 1;
  56                else if (!strcmp(value, "false"))
  57                        options.followtags = 0;
  58                else
  59                        return -1;
  60                return 0;
  61        }
  62        else if (!strcmp(name, "dry-run")) {
  63                if (!strcmp(value, "true"))
  64                        options.dry_run = 1;
  65                else if (!strcmp(value, "false"))
  66                        options.dry_run = 0;
  67                else
  68                        return -1;
  69                return 0;
  70        }
  71        else if (!strcmp(name, "cas")) {
  72                struct strbuf val = STRBUF_INIT;
  73                strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
  74                string_list_append(&cas_options, val.buf);
  75                strbuf_release(&val);
  76                return 0;
  77        }
  78        else {
  79                return 1 /* unsupported */;
  80        }
  81}
  82
  83struct discovery {
  84        const char *service;
  85        char *buf_alloc;
  86        char *buf;
  87        size_t len;
  88        struct ref *refs;
  89        unsigned proto_git : 1;
  90};
  91static struct discovery *last_discovery;
  92
  93static struct ref *parse_git_refs(struct discovery *heads, int for_push)
  94{
  95        struct ref *list = NULL;
  96        get_remote_heads(-1, heads->buf, heads->len, &list,
  97                         for_push ? REF_NORMAL : 0, NULL);
  98        return list;
  99}
 100
 101static struct ref *parse_info_refs(struct discovery *heads)
 102{
 103        char *data, *start, *mid;
 104        char *ref_name;
 105        int i = 0;
 106
 107        struct ref *refs = NULL;
 108        struct ref *ref = NULL;
 109        struct ref *last_ref = NULL;
 110
 111        data = heads->buf;
 112        start = NULL;
 113        mid = data;
 114        while (i < heads->len) {
 115                if (!start) {
 116                        start = &data[i];
 117                }
 118                if (data[i] == '\t')
 119                        mid = &data[i];
 120                if (data[i] == '\n') {
 121                        if (mid - start != 40)
 122                                die("%sinfo/refs not valid: is this a git repository?", url);
 123                        data[i] = 0;
 124                        ref_name = mid + 1;
 125                        ref = xmalloc(sizeof(struct ref) +
 126                                      strlen(ref_name) + 1);
 127                        memset(ref, 0, sizeof(struct ref));
 128                        strcpy(ref->name, ref_name);
 129                        get_sha1_hex(start, ref->old_sha1);
 130                        if (!refs)
 131                                refs = ref;
 132                        if (last_ref)
 133                                last_ref->next = ref;
 134                        last_ref = ref;
 135                        start = NULL;
 136                }
 137                i++;
 138        }
 139
 140        ref = alloc_ref("HEAD");
 141        if (!http_fetch_ref(url, ref) &&
 142            !resolve_remote_symref(ref, refs)) {
 143                ref->next = refs;
 144                refs = ref;
 145        } else {
 146                free(ref);
 147        }
 148
 149        return refs;
 150}
 151
 152static void free_discovery(struct discovery *d)
 153{
 154        if (d) {
 155                if (d == last_discovery)
 156                        last_discovery = NULL;
 157                free(d->buf_alloc);
 158                free_refs(d->refs);
 159                free(d);
 160        }
 161}
 162
 163static int show_http_message(struct strbuf *type, struct strbuf *msg)
 164{
 165        const char *p, *eol;
 166
 167        /*
 168         * We only show text/plain parts, as other types are likely
 169         * to be ugly to look at on the user's terminal.
 170         *
 171         * TODO should handle "; charset=XXX", and re-encode into
 172         * logoutputencoding
 173         */
 174        if (strcasecmp(type->buf, "text/plain"))
 175                return -1;
 176
 177        strbuf_trim(msg);
 178        if (!msg->len)
 179                return -1;
 180
 181        p = msg->buf;
 182        do {
 183                eol = strchrnul(p, '\n');
 184                fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 185                p = eol + 1;
 186        } while(*eol);
 187        return 0;
 188}
 189
 190static struct discovery* discover_refs(const char *service, int for_push)
 191{
 192        struct strbuf exp = STRBUF_INIT;
 193        struct strbuf type = STRBUF_INIT;
 194        struct strbuf buffer = STRBUF_INIT;
 195        struct discovery *last = last_discovery;
 196        char *refs_url;
 197        int http_ret, maybe_smart = 0;
 198
 199        if (last && !strcmp(service, last->service))
 200                return last;
 201        free_discovery(last);
 202
 203        strbuf_addf(&buffer, "%sinfo/refs", url);
 204        if ((!prefixcmp(url, "http://") || !prefixcmp(url, "https://")) &&
 205             git_env_bool("GIT_SMART_HTTP", 1)) {
 206                maybe_smart = 1;
 207                if (!strchr(url, '?'))
 208                        strbuf_addch(&buffer, '?');
 209                else
 210                        strbuf_addch(&buffer, '&');
 211                strbuf_addf(&buffer, "service=%s", service);
 212        }
 213        refs_url = strbuf_detach(&buffer, NULL);
 214
 215        http_ret = http_get_strbuf(refs_url, &type, &buffer,
 216                                   HTTP_NO_CACHE | HTTP_KEEP_ERROR);
 217        switch (http_ret) {
 218        case HTTP_OK:
 219                break;
 220        case HTTP_MISSING_TARGET:
 221                show_http_message(&type, &buffer);
 222                die("repository '%s' not found", url);
 223        case HTTP_NOAUTH:
 224                show_http_message(&type, &buffer);
 225                die("Authentication failed for '%s'", url);
 226        default:
 227                show_http_message(&type, &buffer);
 228                die("unable to access '%s': %s", url, curl_errorstr);
 229        }
 230
 231        last= xcalloc(1, sizeof(*last_discovery));
 232        last->service = service;
 233        last->buf_alloc = strbuf_detach(&buffer, &last->len);
 234        last->buf = last->buf_alloc;
 235
 236        strbuf_addf(&exp, "application/x-%s-advertisement", service);
 237        if (maybe_smart &&
 238            (5 <= last->len && last->buf[4] == '#') &&
 239            !strbuf_cmp(&exp, &type)) {
 240                char *line;
 241
 242                /*
 243                 * smart HTTP response; validate that the service
 244                 * pkt-line matches our request.
 245                 */
 246                line = packet_read_line_buf(&last->buf, &last->len, NULL);
 247
 248                strbuf_reset(&exp);
 249                strbuf_addf(&exp, "# service=%s", service);
 250                if (strcmp(line, exp.buf))
 251                        die("invalid server response; got '%s'", line);
 252                strbuf_release(&exp);
 253
 254                /* The header can include additional metadata lines, up
 255                 * until a packet flush marker.  Ignore these now, but
 256                 * in the future we might start to scan them.
 257                 */
 258                while (packet_read_line_buf(&last->buf, &last->len, NULL))
 259                        ;
 260
 261                last->proto_git = 1;
 262        }
 263
 264        if (last->proto_git)
 265                last->refs = parse_git_refs(last, for_push);
 266        else
 267                last->refs = parse_info_refs(last);
 268
 269        free(refs_url);
 270        strbuf_release(&exp);
 271        strbuf_release(&type);
 272        strbuf_release(&buffer);
 273        last_discovery = last;
 274        return last;
 275}
 276
 277static struct ref *get_refs(int for_push)
 278{
 279        struct discovery *heads;
 280
 281        if (for_push)
 282                heads = discover_refs("git-receive-pack", for_push);
 283        else
 284                heads = discover_refs("git-upload-pack", for_push);
 285
 286        return heads->refs;
 287}
 288
 289static void output_refs(struct ref *refs)
 290{
 291        struct ref *posn;
 292        for (posn = refs; posn; posn = posn->next) {
 293                if (posn->symref)
 294                        printf("@%s %s\n", posn->symref, posn->name);
 295                else
 296                        printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
 297        }
 298        printf("\n");
 299        fflush(stdout);
 300}
 301
 302struct rpc_state {
 303        const char *service_name;
 304        const char **argv;
 305        struct strbuf *stdin_preamble;
 306        char *service_url;
 307        char *hdr_content_type;
 308        char *hdr_accept;
 309        char *buf;
 310        size_t alloc;
 311        size_t len;
 312        size_t pos;
 313        int in;
 314        int out;
 315        struct strbuf result;
 316        unsigned gzip_request : 1;
 317        unsigned initial_buffer : 1;
 318};
 319
 320static size_t rpc_out(void *ptr, size_t eltsize,
 321                size_t nmemb, void *buffer_)
 322{
 323        size_t max = eltsize * nmemb;
 324        struct rpc_state *rpc = buffer_;
 325        size_t avail = rpc->len - rpc->pos;
 326
 327        if (!avail) {
 328                rpc->initial_buffer = 0;
 329                avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 330                if (!avail)
 331                        return 0;
 332                rpc->pos = 0;
 333                rpc->len = avail;
 334        }
 335
 336        if (max < avail)
 337                avail = max;
 338        memcpy(ptr, rpc->buf + rpc->pos, avail);
 339        rpc->pos += avail;
 340        return avail;
 341}
 342
 343#ifndef NO_CURL_IOCTL
 344static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 345{
 346        struct rpc_state *rpc = clientp;
 347
 348        switch (cmd) {
 349        case CURLIOCMD_NOP:
 350                return CURLIOE_OK;
 351
 352        case CURLIOCMD_RESTARTREAD:
 353                if (rpc->initial_buffer) {
 354                        rpc->pos = 0;
 355                        return CURLIOE_OK;
 356                }
 357                fprintf(stderr, "Unable to rewind rpc post data - try increasing http.postBuffer\n");
 358                return CURLIOE_FAILRESTART;
 359
 360        default:
 361                return CURLIOE_UNKNOWNCMD;
 362        }
 363}
 364#endif
 365
 366static size_t rpc_in(char *ptr, size_t eltsize,
 367                size_t nmemb, void *buffer_)
 368{
 369        size_t size = eltsize * nmemb;
 370        struct rpc_state *rpc = buffer_;
 371        write_or_die(rpc->in, ptr, size);
 372        return size;
 373}
 374
 375static int run_slot(struct active_request_slot *slot)
 376{
 377        int err;
 378        struct slot_results results;
 379
 380        slot->results = &results;
 381        slot->curl_result = curl_easy_perform(slot->curl);
 382        finish_active_slot(slot);
 383
 384        err = handle_curl_result(&results);
 385        if (err != HTTP_OK && err != HTTP_REAUTH) {
 386                error("RPC failed; result=%d, HTTP code = %ld",
 387                      results.curl_result, results.http_code);
 388        }
 389
 390        return err;
 391}
 392
 393static int probe_rpc(struct rpc_state *rpc)
 394{
 395        struct active_request_slot *slot;
 396        struct curl_slist *headers = NULL;
 397        struct strbuf buf = STRBUF_INIT;
 398        int err;
 399
 400        slot = get_active_slot();
 401
 402        headers = curl_slist_append(headers, rpc->hdr_content_type);
 403        headers = curl_slist_append(headers, rpc->hdr_accept);
 404
 405        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 406        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 407        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 408        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 409        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 410        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 411        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 412        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 413        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 414
 415        err = run_slot(slot);
 416
 417        curl_slist_free_all(headers);
 418        strbuf_release(&buf);
 419        return err;
 420}
 421
 422static int post_rpc(struct rpc_state *rpc)
 423{
 424        struct active_request_slot *slot;
 425        struct curl_slist *headers = NULL;
 426        int use_gzip = rpc->gzip_request;
 427        char *gzip_body = NULL;
 428        size_t gzip_size = 0;
 429        int err, large_request = 0;
 430
 431        /* Try to load the entire request, if we can fit it into the
 432         * allocated buffer space we can use HTTP/1.0 and avoid the
 433         * chunked encoding mess.
 434         */
 435        while (1) {
 436                size_t left = rpc->alloc - rpc->len;
 437                char *buf = rpc->buf + rpc->len;
 438                int n;
 439
 440                if (left < LARGE_PACKET_MAX) {
 441                        large_request = 1;
 442                        use_gzip = 0;
 443                        break;
 444                }
 445
 446                n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 447                if (!n)
 448                        break;
 449                rpc->len += n;
 450        }
 451
 452        if (large_request) {
 453                do {
 454                        err = probe_rpc(rpc);
 455                } while (err == HTTP_REAUTH);
 456                if (err != HTTP_OK)
 457                        return -1;
 458        }
 459
 460        headers = curl_slist_append(headers, rpc->hdr_content_type);
 461        headers = curl_slist_append(headers, rpc->hdr_accept);
 462        headers = curl_slist_append(headers, "Expect:");
 463
 464retry:
 465        slot = get_active_slot();
 466
 467        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 468        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 469        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 470        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 471
 472        if (large_request) {
 473                /* The request body is large and the size cannot be predicted.
 474                 * We must use chunked encoding to send it.
 475                 */
 476                headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 477                rpc->initial_buffer = 1;
 478                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 479                curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 480#ifndef NO_CURL_IOCTL
 481                curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 482                curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 483#endif
 484                if (options.verbosity > 1) {
 485                        fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 486                        fflush(stderr);
 487                }
 488
 489        } else if (gzip_body) {
 490                /*
 491                 * If we are looping to retry authentication, then the previous
 492                 * run will have set up the headers and gzip buffer already,
 493                 * and we just need to send it.
 494                 */
 495                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 496                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 497
 498        } else if (use_gzip && 1024 < rpc->len) {
 499                /* The client backend isn't giving us compressed data so
 500                 * we can try to deflate it ourselves, this may save on.
 501                 * the transfer time.
 502                 */
 503                git_zstream stream;
 504                int ret;
 505
 506                memset(&stream, 0, sizeof(stream));
 507                git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 508                gzip_size = git_deflate_bound(&stream, rpc->len);
 509                gzip_body = xmalloc(gzip_size);
 510
 511                stream.next_in = (unsigned char *)rpc->buf;
 512                stream.avail_in = rpc->len;
 513                stream.next_out = (unsigned char *)gzip_body;
 514                stream.avail_out = gzip_size;
 515
 516                ret = git_deflate(&stream, Z_FINISH);
 517                if (ret != Z_STREAM_END)
 518                        die("cannot deflate request; zlib deflate error %d", ret);
 519
 520                ret = git_deflate_end_gently(&stream);
 521                if (ret != Z_OK)
 522                        die("cannot deflate request; zlib end error %d", ret);
 523
 524                gzip_size = stream.total_out;
 525
 526                headers = curl_slist_append(headers, "Content-Encoding: gzip");
 527                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 528                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 529
 530                if (options.verbosity > 1) {
 531                        fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 532                                rpc->service_name,
 533                                (unsigned long)rpc->len, (unsigned long)gzip_size);
 534                        fflush(stderr);
 535                }
 536        } else {
 537                /* We know the complete request size in advance, use the
 538                 * more normal Content-Length approach.
 539                 */
 540                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 541                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 542                if (options.verbosity > 1) {
 543                        fprintf(stderr, "POST %s (%lu bytes)\n",
 544                                rpc->service_name, (unsigned long)rpc->len);
 545                        fflush(stderr);
 546                }
 547        }
 548
 549        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 550        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 551        curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 552
 553        err = run_slot(slot);
 554        if (err == HTTP_REAUTH && !large_request)
 555                goto retry;
 556        if (err != HTTP_OK)
 557                err = -1;
 558
 559        curl_slist_free_all(headers);
 560        free(gzip_body);
 561        return err;
 562}
 563
 564static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 565{
 566        const char *svc = rpc->service_name;
 567        struct strbuf buf = STRBUF_INIT;
 568        struct strbuf *preamble = rpc->stdin_preamble;
 569        struct child_process client;
 570        int err = 0;
 571
 572        memset(&client, 0, sizeof(client));
 573        client.in = -1;
 574        client.out = -1;
 575        client.git_cmd = 1;
 576        client.argv = rpc->argv;
 577        if (start_command(&client))
 578                exit(1);
 579        if (preamble)
 580                write_or_die(client.in, preamble->buf, preamble->len);
 581        if (heads)
 582                write_or_die(client.in, heads->buf, heads->len);
 583
 584        rpc->alloc = http_post_buffer;
 585        rpc->buf = xmalloc(rpc->alloc);
 586        rpc->in = client.in;
 587        rpc->out = client.out;
 588        strbuf_init(&rpc->result, 0);
 589
 590        strbuf_addf(&buf, "%s%s", url, svc);
 591        rpc->service_url = strbuf_detach(&buf, NULL);
 592
 593        strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 594        rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 595
 596        strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 597        rpc->hdr_accept = strbuf_detach(&buf, NULL);
 598
 599        while (!err) {
 600                int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 601                if (!n)
 602                        break;
 603                rpc->pos = 0;
 604                rpc->len = n;
 605                err |= post_rpc(rpc);
 606        }
 607
 608        close(client.in);
 609        client.in = -1;
 610        if (!err) {
 611                strbuf_read(&rpc->result, client.out, 0);
 612        } else {
 613                char buf[4096];
 614                for (;;)
 615                        if (xread(client.out, buf, sizeof(buf)) <= 0)
 616                                break;
 617        }
 618
 619        close(client.out);
 620        client.out = -1;
 621
 622        err |= finish_command(&client);
 623        free(rpc->service_url);
 624        free(rpc->hdr_content_type);
 625        free(rpc->hdr_accept);
 626        free(rpc->buf);
 627        strbuf_release(&buf);
 628        return err;
 629}
 630
 631static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 632{
 633        struct walker *walker;
 634        char **targets = xmalloc(nr_heads * sizeof(char*));
 635        int ret, i;
 636
 637        if (options.depth)
 638                die("dumb http transport does not support --depth");
 639        for (i = 0; i < nr_heads; i++)
 640                targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 641
 642        walker = get_http_walker(url);
 643        walker->get_all = 1;
 644        walker->get_tree = 1;
 645        walker->get_history = 1;
 646        walker->get_verbosely = options.verbosity >= 3;
 647        walker->get_recover = 0;
 648        ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 649        walker_free(walker);
 650
 651        for (i = 0; i < nr_heads; i++)
 652                free(targets[i]);
 653        free(targets);
 654
 655        return ret ? error("Fetch failed.") : 0;
 656}
 657
 658static int fetch_git(struct discovery *heads,
 659        int nr_heads, struct ref **to_fetch)
 660{
 661        struct rpc_state rpc;
 662        struct strbuf preamble = STRBUF_INIT;
 663        char *depth_arg = NULL;
 664        int argc = 0, i, err;
 665        const char *argv[15];
 666
 667        argv[argc++] = "fetch-pack";
 668        argv[argc++] = "--stateless-rpc";
 669        argv[argc++] = "--stdin";
 670        argv[argc++] = "--lock-pack";
 671        if (options.followtags)
 672                argv[argc++] = "--include-tag";
 673        if (options.thin)
 674                argv[argc++] = "--thin";
 675        if (options.verbosity >= 3) {
 676                argv[argc++] = "-v";
 677                argv[argc++] = "-v";
 678        }
 679        if (!options.progress)
 680                argv[argc++] = "--no-progress";
 681        if (options.depth) {
 682                struct strbuf buf = STRBUF_INIT;
 683                strbuf_addf(&buf, "--depth=%lu", options.depth);
 684                depth_arg = strbuf_detach(&buf, NULL);
 685                argv[argc++] = depth_arg;
 686        }
 687        argv[argc++] = url;
 688        argv[argc++] = NULL;
 689
 690        for (i = 0; i < nr_heads; i++) {
 691                struct ref *ref = to_fetch[i];
 692                if (!ref->name || !*ref->name)
 693                        die("cannot fetch by sha1 over smart http");
 694                packet_buf_write(&preamble, "%s\n", ref->name);
 695        }
 696        packet_buf_flush(&preamble);
 697
 698        memset(&rpc, 0, sizeof(rpc));
 699        rpc.service_name = "git-upload-pack",
 700        rpc.argv = argv;
 701        rpc.stdin_preamble = &preamble;
 702        rpc.gzip_request = 1;
 703
 704        err = rpc_service(&rpc, heads);
 705        if (rpc.result.len)
 706                write_or_die(1, rpc.result.buf, rpc.result.len);
 707        strbuf_release(&rpc.result);
 708        strbuf_release(&preamble);
 709        free(depth_arg);
 710        return err;
 711}
 712
 713static int fetch(int nr_heads, struct ref **to_fetch)
 714{
 715        struct discovery *d = discover_refs("git-upload-pack", 0);
 716        if (d->proto_git)
 717                return fetch_git(d, nr_heads, to_fetch);
 718        else
 719                return fetch_dumb(nr_heads, to_fetch);
 720}
 721
 722static void parse_fetch(struct strbuf *buf)
 723{
 724        struct ref **to_fetch = NULL;
 725        struct ref *list_head = NULL;
 726        struct ref **list = &list_head;
 727        int alloc_heads = 0, nr_heads = 0;
 728
 729        do {
 730                if (!prefixcmp(buf->buf, "fetch ")) {
 731                        char *p = buf->buf + strlen("fetch ");
 732                        char *name;
 733                        struct ref *ref;
 734                        unsigned char old_sha1[20];
 735
 736                        if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 737                                die("protocol error: expected sha/ref, got %s'", p);
 738                        if (p[40] == ' ')
 739                                name = p + 41;
 740                        else if (!p[40])
 741                                name = "";
 742                        else
 743                                die("protocol error: expected sha/ref, got %s'", p);
 744
 745                        ref = alloc_ref(name);
 746                        hashcpy(ref->old_sha1, old_sha1);
 747
 748                        *list = ref;
 749                        list = &ref->next;
 750
 751                        ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 752                        to_fetch[nr_heads++] = ref;
 753                }
 754                else
 755                        die("http transport does not support %s", buf->buf);
 756
 757                strbuf_reset(buf);
 758                if (strbuf_getline(buf, stdin, '\n') == EOF)
 759                        return;
 760                if (!*buf->buf)
 761                        break;
 762        } while (1);
 763
 764        if (fetch(nr_heads, to_fetch))
 765                exit(128); /* error already reported */
 766        free_refs(list_head);
 767        free(to_fetch);
 768
 769        printf("\n");
 770        fflush(stdout);
 771        strbuf_reset(buf);
 772}
 773
 774static int push_dav(int nr_spec, char **specs)
 775{
 776        const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 777        int argc = 0, i;
 778
 779        argv[argc++] = "http-push";
 780        argv[argc++] = "--helper-status";
 781        if (options.dry_run)
 782                argv[argc++] = "--dry-run";
 783        if (options.verbosity > 1)
 784                argv[argc++] = "--verbose";
 785        argv[argc++] = url;
 786        for (i = 0; i < nr_spec; i++)
 787                argv[argc++] = specs[i];
 788        argv[argc++] = NULL;
 789
 790        if (run_command_v_opt(argv, RUN_GIT_CMD))
 791                die("git-%s failed", argv[0]);
 792        free(argv);
 793        return 0;
 794}
 795
 796static int push_git(struct discovery *heads, int nr_spec, char **specs)
 797{
 798        struct rpc_state rpc;
 799        const char **argv;
 800        int argc = 0, i, err;
 801        struct string_list_item *cas_option;
 802
 803        argv = xmalloc((10 + nr_spec + cas_options.nr) * sizeof(char *));
 804        argv[argc++] = "send-pack";
 805        argv[argc++] = "--stateless-rpc";
 806        argv[argc++] = "--helper-status";
 807        if (options.thin)
 808                argv[argc++] = "--thin";
 809        if (options.dry_run)
 810                argv[argc++] = "--dry-run";
 811        if (options.verbosity == 0)
 812                argv[argc++] = "--quiet";
 813        else if (options.verbosity > 1)
 814                argv[argc++] = "--verbose";
 815        argv[argc++] = options.progress ? "--progress" : "--no-progress";
 816
 817        for_each_string_list_item(cas_option, &cas_options)
 818                argv[argc++] = cas_option->string;
 819
 820        argv[argc++] = url;
 821        for (i = 0; i < nr_spec; i++)
 822                argv[argc++] = specs[i];
 823        argv[argc++] = NULL;
 824
 825        memset(&rpc, 0, sizeof(rpc));
 826        rpc.service_name = "git-receive-pack",
 827        rpc.argv = argv;
 828
 829        err = rpc_service(&rpc, heads);
 830        if (rpc.result.len)
 831                write_or_die(1, rpc.result.buf, rpc.result.len);
 832        strbuf_release(&rpc.result);
 833        free(argv);
 834        return err;
 835}
 836
 837static int push(int nr_spec, char **specs)
 838{
 839        struct discovery *heads = discover_refs("git-receive-pack", 1);
 840        int ret;
 841
 842        if (heads->proto_git)
 843                ret = push_git(heads, nr_spec, specs);
 844        else
 845                ret = push_dav(nr_spec, specs);
 846        free_discovery(heads);
 847        return ret;
 848}
 849
 850static void parse_push(struct strbuf *buf)
 851{
 852        char **specs = NULL;
 853        int alloc_spec = 0, nr_spec = 0, i, ret;
 854
 855        do {
 856                if (!prefixcmp(buf->buf, "push ")) {
 857                        ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 858                        specs[nr_spec++] = xstrdup(buf->buf + 5);
 859                }
 860                else
 861                        die("http transport does not support %s", buf->buf);
 862
 863                strbuf_reset(buf);
 864                if (strbuf_getline(buf, stdin, '\n') == EOF)
 865                        goto free_specs;
 866                if (!*buf->buf)
 867                        break;
 868        } while (1);
 869
 870        ret = push(nr_spec, specs);
 871        printf("\n");
 872        fflush(stdout);
 873
 874        if (ret)
 875                exit(128); /* error already reported */
 876
 877 free_specs:
 878        for (i = 0; i < nr_spec; i++)
 879                free(specs[i]);
 880        free(specs);
 881}
 882
 883int main(int argc, const char **argv)
 884{
 885        struct strbuf buf = STRBUF_INIT;
 886        int nongit;
 887
 888        git_extract_argv0_path(argv[0]);
 889        setup_git_directory_gently(&nongit);
 890        if (argc < 2) {
 891                fprintf(stderr, "Remote needed\n");
 892                return 1;
 893        }
 894
 895        options.verbosity = 1;
 896        options.progress = !!isatty(2);
 897        options.thin = 1;
 898
 899        remote = remote_get(argv[1]);
 900
 901        if (argc > 2) {
 902                end_url_with_slash(&buf, argv[2]);
 903        } else {
 904                end_url_with_slash(&buf, remote->url[0]);
 905        }
 906
 907        url = strbuf_detach(&buf, NULL);
 908
 909        http_init(remote, url, 0);
 910
 911        do {
 912                if (strbuf_getline(&buf, stdin, '\n') == EOF) {
 913                        if (ferror(stdin))
 914                                fprintf(stderr, "Error reading command stream\n");
 915                        else
 916                                fprintf(stderr, "Unexpected end of command stream\n");
 917                        return 1;
 918                }
 919                if (buf.len == 0)
 920                        break;
 921                if (!prefixcmp(buf.buf, "fetch ")) {
 922                        if (nongit)
 923                                die("Fetch attempted without a local repo");
 924                        parse_fetch(&buf);
 925
 926                } else if (!strcmp(buf.buf, "list") || !prefixcmp(buf.buf, "list ")) {
 927                        int for_push = !!strstr(buf.buf + 4, "for-push");
 928                        output_refs(get_refs(for_push));
 929
 930                } else if (!prefixcmp(buf.buf, "push ")) {
 931                        parse_push(&buf);
 932
 933                } else if (!prefixcmp(buf.buf, "option ")) {
 934                        char *name = buf.buf + strlen("option ");
 935                        char *value = strchr(name, ' ');
 936                        int result;
 937
 938                        if (value)
 939                                *value++ = '\0';
 940                        else
 941                                value = "true";
 942
 943                        result = set_option(name, value);
 944                        if (!result)
 945                                printf("ok\n");
 946                        else if (result < 0)
 947                                printf("error invalid value\n");
 948                        else
 949                                printf("unsupported\n");
 950                        fflush(stdout);
 951
 952                } else if (!strcmp(buf.buf, "capabilities")) {
 953                        printf("fetch\n");
 954                        printf("option\n");
 955                        printf("push\n");
 956                        printf("\n");
 957                        fflush(stdout);
 958                } else {
 959                        fprintf(stderr, "Unknown command '%s'\n", buf.buf);
 960                        return 1;
 961                }
 962                strbuf_reset(&buf);
 963        } while (1);
 964
 965        http_cleanup();
 966
 967        return 0;
 968}