Andrew's git / gitweb.git / remote-curl.c
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remote-curl.con commit transport-helper: add 'force' to 'export' helpers (510fa6f)
   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#include "argv-array.h"
  12
  13static struct remote *remote;
  14static const char *url; /* always ends with a trailing slash */
  15
  16struct options {
  17        int verbosity;
  18        unsigned long depth;
  19        unsigned progress : 1,
  20                check_self_contained_and_connected : 1,
  21                followtags : 1,
  22                dry_run : 1,
  23                thin : 1;
  24};
  25static struct options options;
  26static struct string_list cas_options = STRING_LIST_INIT_DUP;
  27
  28static int set_option(const char *name, const char *value)
  29{
  30        if (!strcmp(name, "verbosity")) {
  31                char *end;
  32                int v = strtol(value, &end, 10);
  33                if (value == end || *end)
  34                        return -1;
  35                options.verbosity = v;
  36                return 0;
  37        }
  38        else if (!strcmp(name, "progress")) {
  39                if (!strcmp(value, "true"))
  40                        options.progress = 1;
  41                else if (!strcmp(value, "false"))
  42                        options.progress = 0;
  43                else
  44                        return -1;
  45                return 0;
  46        }
  47        else if (!strcmp(name, "depth")) {
  48                char *end;
  49                unsigned long v = strtoul(value, &end, 10);
  50                if (value == end || *end)
  51                        return -1;
  52                options.depth = v;
  53                return 0;
  54        }
  55        else if (!strcmp(name, "followtags")) {
  56                if (!strcmp(value, "true"))
  57                        options.followtags = 1;
  58                else if (!strcmp(value, "false"))
  59                        options.followtags = 0;
  60                else
  61                        return -1;
  62                return 0;
  63        }
  64        else if (!strcmp(name, "dry-run")) {
  65                if (!strcmp(value, "true"))
  66                        options.dry_run = 1;
  67                else if (!strcmp(value, "false"))
  68                        options.dry_run = 0;
  69                else
  70                        return -1;
  71                return 0;
  72        }
  73        else if (!strcmp(name, "check-connectivity")) {
  74                if (!strcmp(value, "true"))
  75                        options.check_self_contained_and_connected = 1;
  76                else if (!strcmp(value, "false"))
  77                        options.check_self_contained_and_connected = 0;
  78                else
  79                        return -1;
  80                return 0;
  81        }
  82        else if (!strcmp(name, "cas")) {
  83                struct strbuf val = STRBUF_INIT;
  84                strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
  85                string_list_append(&cas_options, val.buf);
  86                strbuf_release(&val);
  87                return 0;
  88        }
  89        else {
  90                return 1 /* unsupported */;
  91        }
  92}
  93
  94struct discovery {
  95        const char *service;
  96        char *buf_alloc;
  97        char *buf;
  98        size_t len;
  99        struct ref *refs;
 100        unsigned proto_git : 1;
 101};
 102static struct discovery *last_discovery;
 103
 104static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 105{
 106        struct ref *list = NULL;
 107        get_remote_heads(-1, heads->buf, heads->len, &list,
 108                         for_push ? REF_NORMAL : 0, NULL);
 109        return list;
 110}
 111
 112static struct ref *parse_info_refs(struct discovery *heads)
 113{
 114        char *data, *start, *mid;
 115        char *ref_name;
 116        int i = 0;
 117
 118        struct ref *refs = NULL;
 119        struct ref *ref = NULL;
 120        struct ref *last_ref = NULL;
 121
 122        data = heads->buf;
 123        start = NULL;
 124        mid = data;
 125        while (i < heads->len) {
 126                if (!start) {
 127                        start = &data[i];
 128                }
 129                if (data[i] == '\t')
 130                        mid = &data[i];
 131                if (data[i] == '\n') {
 132                        if (mid - start != 40)
 133                                die("%sinfo/refs not valid: is this a git repository?", url);
 134                        data[i] = 0;
 135                        ref_name = mid + 1;
 136                        ref = xmalloc(sizeof(struct ref) +
 137                                      strlen(ref_name) + 1);
 138                        memset(ref, 0, sizeof(struct ref));
 139                        strcpy(ref->name, ref_name);
 140                        get_sha1_hex(start, ref->old_sha1);
 141                        if (!refs)
 142                                refs = ref;
 143                        if (last_ref)
 144                                last_ref->next = ref;
 145                        last_ref = ref;
 146                        start = NULL;
 147                }
 148                i++;
 149        }
 150
 151        ref = alloc_ref("HEAD");
 152        if (!http_fetch_ref(url, ref) &&
 153            !resolve_remote_symref(ref, refs)) {
 154                ref->next = refs;
 155                refs = ref;
 156        } else {
 157                free(ref);
 158        }
 159
 160        return refs;
 161}
 162
 163static void free_discovery(struct discovery *d)
 164{
 165        if (d) {
 166                if (d == last_discovery)
 167                        last_discovery = NULL;
 168                free(d->buf_alloc);
 169                free_refs(d->refs);
 170                free(d);
 171        }
 172}
 173
 174static int show_http_message(struct strbuf *type, struct strbuf *msg)
 175{
 176        const char *p, *eol;
 177
 178        /*
 179         * We only show text/plain parts, as other types are likely
 180         * to be ugly to look at on the user's terminal.
 181         *
 182         * TODO should handle "; charset=XXX", and re-encode into
 183         * logoutputencoding
 184         */
 185        if (strcasecmp(type->buf, "text/plain"))
 186                return -1;
 187
 188        strbuf_trim(msg);
 189        if (!msg->len)
 190                return -1;
 191
 192        p = msg->buf;
 193        do {
 194                eol = strchrnul(p, '\n');
 195                fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 196                p = eol + 1;
 197        } while(*eol);
 198        return 0;
 199}
 200
 201static struct discovery* discover_refs(const char *service, int for_push)
 202{
 203        struct strbuf exp = STRBUF_INIT;
 204        struct strbuf type = STRBUF_INIT;
 205        struct strbuf buffer = STRBUF_INIT;
 206        struct discovery *last = last_discovery;
 207        char *refs_url;
 208        int http_ret, maybe_smart = 0;
 209
 210        if (last && !strcmp(service, last->service))
 211                return last;
 212        free_discovery(last);
 213
 214        strbuf_addf(&buffer, "%sinfo/refs", url);
 215        if ((!prefixcmp(url, "http://") || !prefixcmp(url, "https://")) &&
 216             git_env_bool("GIT_SMART_HTTP", 1)) {
 217                maybe_smart = 1;
 218                if (!strchr(url, '?'))
 219                        strbuf_addch(&buffer, '?');
 220                else
 221                        strbuf_addch(&buffer, '&');
 222                strbuf_addf(&buffer, "service=%s", service);
 223        }
 224        refs_url = strbuf_detach(&buffer, NULL);
 225
 226        http_ret = http_get_strbuf(refs_url, &type, &buffer,
 227                                   HTTP_NO_CACHE | HTTP_KEEP_ERROR);
 228        switch (http_ret) {
 229        case HTTP_OK:
 230                break;
 231        case HTTP_MISSING_TARGET:
 232                show_http_message(&type, &buffer);
 233                die("repository '%s' not found", url);
 234        case HTTP_NOAUTH:
 235                show_http_message(&type, &buffer);
 236                die("Authentication failed for '%s'", url);
 237        default:
 238                show_http_message(&type, &buffer);
 239                die("unable to access '%s': %s", url, curl_errorstr);
 240        }
 241
 242        last= xcalloc(1, sizeof(*last_discovery));
 243        last->service = service;
 244        last->buf_alloc = strbuf_detach(&buffer, &last->len);
 245        last->buf = last->buf_alloc;
 246
 247        strbuf_addf(&exp, "application/x-%s-advertisement", service);
 248        if (maybe_smart &&
 249            (5 <= last->len && last->buf[4] == '#') &&
 250            !strbuf_cmp(&exp, &type)) {
 251                char *line;
 252
 253                /*
 254                 * smart HTTP response; validate that the service
 255                 * pkt-line matches our request.
 256                 */
 257                line = packet_read_line_buf(&last->buf, &last->len, NULL);
 258
 259                strbuf_reset(&exp);
 260                strbuf_addf(&exp, "# service=%s", service);
 261                if (strcmp(line, exp.buf))
 262                        die("invalid server response; got '%s'", line);
 263                strbuf_release(&exp);
 264
 265                /* The header can include additional metadata lines, up
 266                 * until a packet flush marker.  Ignore these now, but
 267                 * in the future we might start to scan them.
 268                 */
 269                while (packet_read_line_buf(&last->buf, &last->len, NULL))
 270                        ;
 271
 272                last->proto_git = 1;
 273        }
 274
 275        if (last->proto_git)
 276                last->refs = parse_git_refs(last, for_push);
 277        else
 278                last->refs = parse_info_refs(last);
 279
 280        free(refs_url);
 281        strbuf_release(&exp);
 282        strbuf_release(&type);
 283        strbuf_release(&buffer);
 284        last_discovery = last;
 285        return last;
 286}
 287
 288static struct ref *get_refs(int for_push)
 289{
 290        struct discovery *heads;
 291
 292        if (for_push)
 293                heads = discover_refs("git-receive-pack", for_push);
 294        else
 295                heads = discover_refs("git-upload-pack", for_push);
 296
 297        return heads->refs;
 298}
 299
 300static void output_refs(struct ref *refs)
 301{
 302        struct ref *posn;
 303        for (posn = refs; posn; posn = posn->next) {
 304                if (posn->symref)
 305                        printf("@%s %s\n", posn->symref, posn->name);
 306                else
 307                        printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
 308        }
 309        printf("\n");
 310        fflush(stdout);
 311}
 312
 313struct rpc_state {
 314        const char *service_name;
 315        const char **argv;
 316        struct strbuf *stdin_preamble;
 317        char *service_url;
 318        char *hdr_content_type;
 319        char *hdr_accept;
 320        char *buf;
 321        size_t alloc;
 322        size_t len;
 323        size_t pos;
 324        int in;
 325        int out;
 326        struct strbuf result;
 327        unsigned gzip_request : 1;
 328        unsigned initial_buffer : 1;
 329};
 330
 331static size_t rpc_out(void *ptr, size_t eltsize,
 332                size_t nmemb, void *buffer_)
 333{
 334        size_t max = eltsize * nmemb;
 335        struct rpc_state *rpc = buffer_;
 336        size_t avail = rpc->len - rpc->pos;
 337
 338        if (!avail) {
 339                rpc->initial_buffer = 0;
 340                avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 341                if (!avail)
 342                        return 0;
 343                rpc->pos = 0;
 344                rpc->len = avail;
 345        }
 346
 347        if (max < avail)
 348                avail = max;
 349        memcpy(ptr, rpc->buf + rpc->pos, avail);
 350        rpc->pos += avail;
 351        return avail;
 352}
 353
 354#ifndef NO_CURL_IOCTL
 355static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 356{
 357        struct rpc_state *rpc = clientp;
 358
 359        switch (cmd) {
 360        case CURLIOCMD_NOP:
 361                return CURLIOE_OK;
 362
 363        case CURLIOCMD_RESTARTREAD:
 364                if (rpc->initial_buffer) {
 365                        rpc->pos = 0;
 366                        return CURLIOE_OK;
 367                }
 368                fprintf(stderr, "Unable to rewind rpc post data - try increasing http.postBuffer\n");
 369                return CURLIOE_FAILRESTART;
 370
 371        default:
 372                return CURLIOE_UNKNOWNCMD;
 373        }
 374}
 375#endif
 376
 377static size_t rpc_in(char *ptr, size_t eltsize,
 378                size_t nmemb, void *buffer_)
 379{
 380        size_t size = eltsize * nmemb;
 381        struct rpc_state *rpc = buffer_;
 382        write_or_die(rpc->in, ptr, size);
 383        return size;
 384}
 385
 386static int run_slot(struct active_request_slot *slot)
 387{
 388        int err;
 389        struct slot_results results;
 390
 391        slot->results = &results;
 392        slot->curl_result = curl_easy_perform(slot->curl);
 393        finish_active_slot(slot);
 394
 395        err = handle_curl_result(&results);
 396        if (err != HTTP_OK && err != HTTP_REAUTH) {
 397                error("RPC failed; result=%d, HTTP code = %ld",
 398                      results.curl_result, results.http_code);
 399        }
 400
 401        return err;
 402}
 403
 404static int probe_rpc(struct rpc_state *rpc)
 405{
 406        struct active_request_slot *slot;
 407        struct curl_slist *headers = NULL;
 408        struct strbuf buf = STRBUF_INIT;
 409        int err;
 410
 411        slot = get_active_slot();
 412
 413        headers = curl_slist_append(headers, rpc->hdr_content_type);
 414        headers = curl_slist_append(headers, rpc->hdr_accept);
 415
 416        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 417        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 418        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 419        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 420        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 421        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 422        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 423        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 424        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 425
 426        err = run_slot(slot);
 427
 428        curl_slist_free_all(headers);
 429        strbuf_release(&buf);
 430        return err;
 431}
 432
 433static int post_rpc(struct rpc_state *rpc)
 434{
 435        struct active_request_slot *slot;
 436        struct curl_slist *headers = NULL;
 437        int use_gzip = rpc->gzip_request;
 438        char *gzip_body = NULL;
 439        size_t gzip_size = 0;
 440        int err, large_request = 0;
 441
 442        /* Try to load the entire request, if we can fit it into the
 443         * allocated buffer space we can use HTTP/1.0 and avoid the
 444         * chunked encoding mess.
 445         */
 446        while (1) {
 447                size_t left = rpc->alloc - rpc->len;
 448                char *buf = rpc->buf + rpc->len;
 449                int n;
 450
 451                if (left < LARGE_PACKET_MAX) {
 452                        large_request = 1;
 453                        use_gzip = 0;
 454                        break;
 455                }
 456
 457                n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 458                if (!n)
 459                        break;
 460                rpc->len += n;
 461        }
 462
 463        if (large_request) {
 464                do {
 465                        err = probe_rpc(rpc);
 466                } while (err == HTTP_REAUTH);
 467                if (err != HTTP_OK)
 468                        return -1;
 469        }
 470
 471        headers = curl_slist_append(headers, rpc->hdr_content_type);
 472        headers = curl_slist_append(headers, rpc->hdr_accept);
 473        headers = curl_slist_append(headers, "Expect:");
 474
 475retry:
 476        slot = get_active_slot();
 477
 478        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 479        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 480        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 481        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 482
 483        if (large_request) {
 484                /* The request body is large and the size cannot be predicted.
 485                 * We must use chunked encoding to send it.
 486                 */
 487                headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 488                rpc->initial_buffer = 1;
 489                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 490                curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 491#ifndef NO_CURL_IOCTL
 492                curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 493                curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 494#endif
 495                if (options.verbosity > 1) {
 496                        fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 497                        fflush(stderr);
 498                }
 499
 500        } else if (gzip_body) {
 501                /*
 502                 * If we are looping to retry authentication, then the previous
 503                 * run will have set up the headers and gzip buffer already,
 504                 * and we just need to send it.
 505                 */
 506                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 507                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 508
 509        } else if (use_gzip && 1024 < rpc->len) {
 510                /* The client backend isn't giving us compressed data so
 511                 * we can try to deflate it ourselves, this may save on.
 512                 * the transfer time.
 513                 */
 514                git_zstream stream;
 515                int ret;
 516
 517                memset(&stream, 0, sizeof(stream));
 518                git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 519                gzip_size = git_deflate_bound(&stream, rpc->len);
 520                gzip_body = xmalloc(gzip_size);
 521
 522                stream.next_in = (unsigned char *)rpc->buf;
 523                stream.avail_in = rpc->len;
 524                stream.next_out = (unsigned char *)gzip_body;
 525                stream.avail_out = gzip_size;
 526
 527                ret = git_deflate(&stream, Z_FINISH);
 528                if (ret != Z_STREAM_END)
 529                        die("cannot deflate request; zlib deflate error %d", ret);
 530
 531                ret = git_deflate_end_gently(&stream);
 532                if (ret != Z_OK)
 533                        die("cannot deflate request; zlib end error %d", ret);
 534
 535                gzip_size = stream.total_out;
 536
 537                headers = curl_slist_append(headers, "Content-Encoding: gzip");
 538                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 539                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 540
 541                if (options.verbosity > 1) {
 542                        fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 543                                rpc->service_name,
 544                                (unsigned long)rpc->len, (unsigned long)gzip_size);
 545                        fflush(stderr);
 546                }
 547        } else {
 548                /* We know the complete request size in advance, use the
 549                 * more normal Content-Length approach.
 550                 */
 551                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 552                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 553                if (options.verbosity > 1) {
 554                        fprintf(stderr, "POST %s (%lu bytes)\n",
 555                                rpc->service_name, (unsigned long)rpc->len);
 556                        fflush(stderr);
 557                }
 558        }
 559
 560        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 561        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 562        curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 563
 564        err = run_slot(slot);
 565        if (err == HTTP_REAUTH && !large_request)
 566                goto retry;
 567        if (err != HTTP_OK)
 568                err = -1;
 569
 570        curl_slist_free_all(headers);
 571        free(gzip_body);
 572        return err;
 573}
 574
 575static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 576{
 577        const char *svc = rpc->service_name;
 578        struct strbuf buf = STRBUF_INIT;
 579        struct strbuf *preamble = rpc->stdin_preamble;
 580        struct child_process client;
 581        int err = 0;
 582
 583        memset(&client, 0, sizeof(client));
 584        client.in = -1;
 585        client.out = -1;
 586        client.git_cmd = 1;
 587        client.argv = rpc->argv;
 588        if (start_command(&client))
 589                exit(1);
 590        if (preamble)
 591                write_or_die(client.in, preamble->buf, preamble->len);
 592        if (heads)
 593                write_or_die(client.in, heads->buf, heads->len);
 594
 595        rpc->alloc = http_post_buffer;
 596        rpc->buf = xmalloc(rpc->alloc);
 597        rpc->in = client.in;
 598        rpc->out = client.out;
 599        strbuf_init(&rpc->result, 0);
 600
 601        strbuf_addf(&buf, "%s%s", url, svc);
 602        rpc->service_url = strbuf_detach(&buf, NULL);
 603
 604        strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 605        rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 606
 607        strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 608        rpc->hdr_accept = strbuf_detach(&buf, NULL);
 609
 610        while (!err) {
 611                int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 612                if (!n)
 613                        break;
 614                rpc->pos = 0;
 615                rpc->len = n;
 616                err |= post_rpc(rpc);
 617        }
 618
 619        close(client.in);
 620        client.in = -1;
 621        if (!err) {
 622                strbuf_read(&rpc->result, client.out, 0);
 623        } else {
 624                char buf[4096];
 625                for (;;)
 626                        if (xread(client.out, buf, sizeof(buf)) <= 0)
 627                                break;
 628        }
 629
 630        close(client.out);
 631        client.out = -1;
 632
 633        err |= finish_command(&client);
 634        free(rpc->service_url);
 635        free(rpc->hdr_content_type);
 636        free(rpc->hdr_accept);
 637        free(rpc->buf);
 638        strbuf_release(&buf);
 639        return err;
 640}
 641
 642static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 643{
 644        struct walker *walker;
 645        char **targets = xmalloc(nr_heads * sizeof(char*));
 646        int ret, i;
 647
 648        if (options.depth)
 649                die("dumb http transport does not support --depth");
 650        for (i = 0; i < nr_heads; i++)
 651                targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 652
 653        walker = get_http_walker(url);
 654        walker->get_all = 1;
 655        walker->get_tree = 1;
 656        walker->get_history = 1;
 657        walker->get_verbosely = options.verbosity >= 3;
 658        walker->get_recover = 0;
 659        ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 660        walker_free(walker);
 661
 662        for (i = 0; i < nr_heads; i++)
 663                free(targets[i]);
 664        free(targets);
 665
 666        return ret ? error("Fetch failed.") : 0;
 667}
 668
 669static int fetch_git(struct discovery *heads,
 670        int nr_heads, struct ref **to_fetch)
 671{
 672        struct rpc_state rpc;
 673        struct strbuf preamble = STRBUF_INIT;
 674        char *depth_arg = NULL;
 675        int argc = 0, i, err;
 676        const char *argv[16];
 677
 678        argv[argc++] = "fetch-pack";
 679        argv[argc++] = "--stateless-rpc";
 680        argv[argc++] = "--stdin";
 681        argv[argc++] = "--lock-pack";
 682        if (options.followtags)
 683                argv[argc++] = "--include-tag";
 684        if (options.thin)
 685                argv[argc++] = "--thin";
 686        if (options.verbosity >= 3) {
 687                argv[argc++] = "-v";
 688                argv[argc++] = "-v";
 689        }
 690        if (options.check_self_contained_and_connected)
 691                argv[argc++] = "--check-self-contained-and-connected";
 692        if (!options.progress)
 693                argv[argc++] = "--no-progress";
 694        if (options.depth) {
 695                struct strbuf buf = STRBUF_INIT;
 696                strbuf_addf(&buf, "--depth=%lu", options.depth);
 697                depth_arg = strbuf_detach(&buf, NULL);
 698                argv[argc++] = depth_arg;
 699        }
 700        argv[argc++] = url;
 701        argv[argc++] = NULL;
 702
 703        for (i = 0; i < nr_heads; i++) {
 704                struct ref *ref = to_fetch[i];
 705                if (!ref->name || !*ref->name)
 706                        die("cannot fetch by sha1 over smart http");
 707                packet_buf_write(&preamble, "%s\n", ref->name);
 708        }
 709        packet_buf_flush(&preamble);
 710
 711        memset(&rpc, 0, sizeof(rpc));
 712        rpc.service_name = "git-upload-pack",
 713        rpc.argv = argv;
 714        rpc.stdin_preamble = &preamble;
 715        rpc.gzip_request = 1;
 716
 717        err = rpc_service(&rpc, heads);
 718        if (rpc.result.len)
 719                write_or_die(1, rpc.result.buf, rpc.result.len);
 720        strbuf_release(&rpc.result);
 721        strbuf_release(&preamble);
 722        free(depth_arg);
 723        return err;
 724}
 725
 726static int fetch(int nr_heads, struct ref **to_fetch)
 727{
 728        struct discovery *d = discover_refs("git-upload-pack", 0);
 729        if (d->proto_git)
 730                return fetch_git(d, nr_heads, to_fetch);
 731        else
 732                return fetch_dumb(nr_heads, to_fetch);
 733}
 734
 735static void parse_fetch(struct strbuf *buf)
 736{
 737        struct ref **to_fetch = NULL;
 738        struct ref *list_head = NULL;
 739        struct ref **list = &list_head;
 740        int alloc_heads = 0, nr_heads = 0;
 741
 742        do {
 743                if (!prefixcmp(buf->buf, "fetch ")) {
 744                        char *p = buf->buf + strlen("fetch ");
 745                        char *name;
 746                        struct ref *ref;
 747                        unsigned char old_sha1[20];
 748
 749                        if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 750                                die("protocol error: expected sha/ref, got %s'", p);
 751                        if (p[40] == ' ')
 752                                name = p + 41;
 753                        else if (!p[40])
 754                                name = "";
 755                        else
 756                                die("protocol error: expected sha/ref, got %s'", p);
 757
 758                        ref = alloc_ref(name);
 759                        hashcpy(ref->old_sha1, old_sha1);
 760
 761                        *list = ref;
 762                        list = &ref->next;
 763
 764                        ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 765                        to_fetch[nr_heads++] = ref;
 766                }
 767                else
 768                        die("http transport does not support %s", buf->buf);
 769
 770                strbuf_reset(buf);
 771                if (strbuf_getline(buf, stdin, '\n') == EOF)
 772                        return;
 773                if (!*buf->buf)
 774                        break;
 775        } while (1);
 776
 777        if (fetch(nr_heads, to_fetch))
 778                exit(128); /* error already reported */
 779        free_refs(list_head);
 780        free(to_fetch);
 781
 782        printf("\n");
 783        fflush(stdout);
 784        strbuf_reset(buf);
 785}
 786
 787static int push_dav(int nr_spec, char **specs)
 788{
 789        const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 790        int argc = 0, i;
 791
 792        argv[argc++] = "http-push";
 793        argv[argc++] = "--helper-status";
 794        if (options.dry_run)
 795                argv[argc++] = "--dry-run";
 796        if (options.verbosity > 1)
 797                argv[argc++] = "--verbose";
 798        argv[argc++] = url;
 799        for (i = 0; i < nr_spec; i++)
 800                argv[argc++] = specs[i];
 801        argv[argc++] = NULL;
 802
 803        if (run_command_v_opt(argv, RUN_GIT_CMD))
 804                die("git-%s failed", argv[0]);
 805        free(argv);
 806        return 0;
 807}
 808
 809static int push_git(struct discovery *heads, int nr_spec, char **specs)
 810{
 811        struct rpc_state rpc;
 812        int i, err;
 813        struct argv_array args;
 814        struct string_list_item *cas_option;
 815
 816        argv_array_init(&args);
 817        argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
 818                         NULL);
 819
 820        if (options.thin)
 821                argv_array_push(&args, "--thin");
 822        if (options.dry_run)
 823                argv_array_push(&args, "--dry-run");
 824        if (options.verbosity == 0)
 825                argv_array_push(&args, "--quiet");
 826        else if (options.verbosity > 1)
 827                argv_array_push(&args, "--verbose");
 828        argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
 829        for_each_string_list_item(cas_option, &cas_options)
 830                argv_array_push(&args, cas_option->string);
 831        argv_array_push(&args, url);
 832        for (i = 0; i < nr_spec; i++)
 833                argv_array_push(&args, specs[i]);
 834
 835        memset(&rpc, 0, sizeof(rpc));
 836        rpc.service_name = "git-receive-pack",
 837        rpc.argv = args.argv;
 838
 839        err = rpc_service(&rpc, heads);
 840        if (rpc.result.len)
 841                write_or_die(1, rpc.result.buf, rpc.result.len);
 842        strbuf_release(&rpc.result);
 843        argv_array_clear(&args);
 844        return err;
 845}
 846
 847static int push(int nr_spec, char **specs)
 848{
 849        struct discovery *heads = discover_refs("git-receive-pack", 1);
 850        int ret;
 851
 852        if (heads->proto_git)
 853                ret = push_git(heads, nr_spec, specs);
 854        else
 855                ret = push_dav(nr_spec, specs);
 856        free_discovery(heads);
 857        return ret;
 858}
 859
 860static void parse_push(struct strbuf *buf)
 861{
 862        char **specs = NULL;
 863        int alloc_spec = 0, nr_spec = 0, i, ret;
 864
 865        do {
 866                if (!prefixcmp(buf->buf, "push ")) {
 867                        ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 868                        specs[nr_spec++] = xstrdup(buf->buf + 5);
 869                }
 870                else
 871                        die("http transport does not support %s", buf->buf);
 872
 873                strbuf_reset(buf);
 874                if (strbuf_getline(buf, stdin, '\n') == EOF)
 875                        goto free_specs;
 876                if (!*buf->buf)
 877                        break;
 878        } while (1);
 879
 880        ret = push(nr_spec, specs);
 881        printf("\n");
 882        fflush(stdout);
 883
 884        if (ret)
 885                exit(128); /* error already reported */
 886
 887 free_specs:
 888        for (i = 0; i < nr_spec; i++)
 889                free(specs[i]);
 890        free(specs);
 891}
 892
 893int main(int argc, const char **argv)
 894{
 895        struct strbuf buf = STRBUF_INIT;
 896        int nongit;
 897
 898        git_extract_argv0_path(argv[0]);
 899        setup_git_directory_gently(&nongit);
 900        if (argc < 2) {
 901                fprintf(stderr, "Remote needed\n");
 902                return 1;
 903        }
 904
 905        options.verbosity = 1;
 906        options.progress = !!isatty(2);
 907        options.thin = 1;
 908
 909        remote = remote_get(argv[1]);
 910
 911        if (argc > 2) {
 912                end_url_with_slash(&buf, argv[2]);
 913        } else {
 914                end_url_with_slash(&buf, remote->url[0]);
 915        }
 916
 917        url = strbuf_detach(&buf, NULL);
 918
 919        http_init(remote, url, 0);
 920
 921        do {
 922                if (strbuf_getline(&buf, stdin, '\n') == EOF) {
 923                        if (ferror(stdin))
 924                                fprintf(stderr, "Error reading command stream\n");
 925                        else
 926                                fprintf(stderr, "Unexpected end of command stream\n");
 927                        return 1;
 928                }
 929                if (buf.len == 0)
 930                        break;
 931                if (!prefixcmp(buf.buf, "fetch ")) {
 932                        if (nongit)
 933                                die("Fetch attempted without a local repo");
 934                        parse_fetch(&buf);
 935
 936                } else if (!strcmp(buf.buf, "list") || !prefixcmp(buf.buf, "list ")) {
 937                        int for_push = !!strstr(buf.buf + 4, "for-push");
 938                        output_refs(get_refs(for_push));
 939
 940                } else if (!prefixcmp(buf.buf, "push ")) {
 941                        parse_push(&buf);
 942
 943                } else if (!prefixcmp(buf.buf, "option ")) {
 944                        char *name = buf.buf + strlen("option ");
 945                        char *value = strchr(name, ' ');
 946                        int result;
 947
 948                        if (value)
 949                                *value++ = '\0';
 950                        else
 951                                value = "true";
 952
 953                        result = set_option(name, value);
 954                        if (!result)
 955                                printf("ok\n");
 956                        else if (result < 0)
 957                                printf("error invalid value\n");
 958                        else
 959                                printf("unsupported\n");
 960                        fflush(stdout);
 961
 962                } else if (!strcmp(buf.buf, "capabilities")) {
 963                        printf("fetch\n");
 964                        printf("option\n");
 965                        printf("push\n");
 966                        printf("check-connectivity\n");
 967                        printf("\n");
 968                        fflush(stdout);
 969                } else {
 970                        fprintf(stderr, "Unknown command '%s'\n", buf.buf);
 971                        return 1;
 972                }
 973                strbuf_reset(&buf);
 974        } while (1);
 975
 976        http_cleanup();
 977
 978        return 0;
 979}