Andrew's git / gitweb.git / remote-curl.c
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remote-curl.con commit builtin/merge.c: drop a parameter that is never used (08e3ce5)
   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#include "credential.h"
  13
  14static struct remote *remote;
  15/* always ends with a trailing slash */
  16static struct strbuf url = STRBUF_INIT;
  17
  18struct options {
  19        int verbosity;
  20        unsigned long depth;
  21        unsigned progress : 1,
  22                check_self_contained_and_connected : 1,
  23                followtags : 1,
  24                dry_run : 1,
  25                thin : 1;
  26};
  27static struct options options;
  28static struct string_list cas_options = STRING_LIST_INIT_DUP;
  29
  30static int set_option(const char *name, const char *value)
  31{
  32        if (!strcmp(name, "verbosity")) {
  33                char *end;
  34                int v = strtol(value, &end, 10);
  35                if (value == end || *end)
  36                        return -1;
  37                options.verbosity = v;
  38                return 0;
  39        }
  40        else if (!strcmp(name, "progress")) {
  41                if (!strcmp(value, "true"))
  42                        options.progress = 1;
  43                else if (!strcmp(value, "false"))
  44                        options.progress = 0;
  45                else
  46                        return -1;
  47                return 0;
  48        }
  49        else if (!strcmp(name, "depth")) {
  50                char *end;
  51                unsigned long v = strtoul(value, &end, 10);
  52                if (value == end || *end)
  53                        return -1;
  54                options.depth = v;
  55                return 0;
  56        }
  57        else if (!strcmp(name, "followtags")) {
  58                if (!strcmp(value, "true"))
  59                        options.followtags = 1;
  60                else if (!strcmp(value, "false"))
  61                        options.followtags = 0;
  62                else
  63                        return -1;
  64                return 0;
  65        }
  66        else if (!strcmp(name, "dry-run")) {
  67                if (!strcmp(value, "true"))
  68                        options.dry_run = 1;
  69                else if (!strcmp(value, "false"))
  70                        options.dry_run = 0;
  71                else
  72                        return -1;
  73                return 0;
  74        }
  75        else if (!strcmp(name, "check-connectivity")) {
  76                if (!strcmp(value, "true"))
  77                        options.check_self_contained_and_connected = 1;
  78                else if (!strcmp(value, "false"))
  79                        options.check_self_contained_and_connected = 0;
  80                else
  81                        return -1;
  82                return 0;
  83        }
  84        else if (!strcmp(name, "cas")) {
  85                struct strbuf val = STRBUF_INIT;
  86                strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
  87                string_list_append(&cas_options, val.buf);
  88                strbuf_release(&val);
  89                return 0;
  90        }
  91        else {
  92                return 1 /* unsupported */;
  93        }
  94}
  95
  96struct discovery {
  97        const char *service;
  98        char *buf_alloc;
  99        char *buf;
 100        size_t len;
 101        struct ref *refs;
 102        unsigned proto_git : 1;
 103};
 104static struct discovery *last_discovery;
 105
 106static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 107{
 108        struct ref *list = NULL;
 109        get_remote_heads(-1, heads->buf, heads->len, &list,
 110                         for_push ? REF_NORMAL : 0, NULL);
 111        return list;
 112}
 113
 114static struct ref *parse_info_refs(struct discovery *heads)
 115{
 116        char *data, *start, *mid;
 117        char *ref_name;
 118        int i = 0;
 119
 120        struct ref *refs = NULL;
 121        struct ref *ref = NULL;
 122        struct ref *last_ref = NULL;
 123
 124        data = heads->buf;
 125        start = NULL;
 126        mid = data;
 127        while (i < heads->len) {
 128                if (!start) {
 129                        start = &data[i];
 130                }
 131                if (data[i] == '\t')
 132                        mid = &data[i];
 133                if (data[i] == '\n') {
 134                        if (mid - start != 40)
 135                                die("%sinfo/refs not valid: is this a git repository?",
 136                                    url.buf);
 137                        data[i] = 0;
 138                        ref_name = mid + 1;
 139                        ref = xmalloc(sizeof(struct ref) +
 140                                      strlen(ref_name) + 1);
 141                        memset(ref, 0, sizeof(struct ref));
 142                        strcpy(ref->name, ref_name);
 143                        get_sha1_hex(start, ref->old_sha1);
 144                        if (!refs)
 145                                refs = ref;
 146                        if (last_ref)
 147                                last_ref->next = ref;
 148                        last_ref = ref;
 149                        start = NULL;
 150                }
 151                i++;
 152        }
 153
 154        ref = alloc_ref("HEAD");
 155        if (!http_fetch_ref(url.buf, ref) &&
 156            !resolve_remote_symref(ref, refs)) {
 157                ref->next = refs;
 158                refs = ref;
 159        } else {
 160                free(ref);
 161        }
 162
 163        return refs;
 164}
 165
 166static void free_discovery(struct discovery *d)
 167{
 168        if (d) {
 169                if (d == last_discovery)
 170                        last_discovery = NULL;
 171                free(d->buf_alloc);
 172                free_refs(d->refs);
 173                free(d);
 174        }
 175}
 176
 177static int show_http_message(struct strbuf *type, struct strbuf *msg)
 178{
 179        const char *p, *eol;
 180
 181        /*
 182         * We only show text/plain parts, as other types are likely
 183         * to be ugly to look at on the user's terminal.
 184         *
 185         * TODO should handle "; charset=XXX", and re-encode into
 186         * logoutputencoding
 187         */
 188        if (strcasecmp(type->buf, "text/plain"))
 189                return -1;
 190
 191        strbuf_trim(msg);
 192        if (!msg->len)
 193                return -1;
 194
 195        p = msg->buf;
 196        do {
 197                eol = strchrnul(p, '\n');
 198                fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 199                p = eol + 1;
 200        } while(*eol);
 201        return 0;
 202}
 203
 204static struct discovery* discover_refs(const char *service, int for_push)
 205{
 206        struct strbuf exp = STRBUF_INIT;
 207        struct strbuf type = STRBUF_INIT;
 208        struct strbuf buffer = STRBUF_INIT;
 209        struct strbuf refs_url = STRBUF_INIT;
 210        struct strbuf effective_url = STRBUF_INIT;
 211        struct discovery *last = last_discovery;
 212        int http_ret, maybe_smart = 0;
 213        struct http_get_options options;
 214
 215        if (last && !strcmp(service, last->service))
 216                return last;
 217        free_discovery(last);
 218
 219        strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 220        if ((!prefixcmp(url.buf, "http://") || !prefixcmp(url.buf, "https://")) &&
 221             git_env_bool("GIT_SMART_HTTP", 1)) {
 222                maybe_smart = 1;
 223                if (!strchr(url.buf, '?'))
 224                        strbuf_addch(&refs_url, '?');
 225                else
 226                        strbuf_addch(&refs_url, '&');
 227                strbuf_addf(&refs_url, "service=%s", service);
 228        }
 229
 230        memset(&options, 0, sizeof(options));
 231        options.content_type = &type;
 232        options.effective_url = &effective_url;
 233        options.base_url = &url;
 234        options.no_cache = 1;
 235        options.keep_error = 1;
 236
 237        http_ret = http_get_strbuf(refs_url.buf, &buffer, &options);
 238        switch (http_ret) {
 239        case HTTP_OK:
 240                break;
 241        case HTTP_MISSING_TARGET:
 242                show_http_message(&type, &buffer);
 243                die("repository '%s' not found", url.buf);
 244        case HTTP_NOAUTH:
 245                show_http_message(&type, &buffer);
 246                die("Authentication failed for '%s'", url.buf);
 247        default:
 248                show_http_message(&type, &buffer);
 249                die("unable to access '%s': %s", url.buf, curl_errorstr);
 250        }
 251
 252        last= xcalloc(1, sizeof(*last_discovery));
 253        last->service = service;
 254        last->buf_alloc = strbuf_detach(&buffer, &last->len);
 255        last->buf = last->buf_alloc;
 256
 257        strbuf_addf(&exp, "application/x-%s-advertisement", service);
 258        if (maybe_smart &&
 259            (5 <= last->len && last->buf[4] == '#') &&
 260            !strbuf_cmp(&exp, &type)) {
 261                char *line;
 262
 263                /*
 264                 * smart HTTP response; validate that the service
 265                 * pkt-line matches our request.
 266                 */
 267                line = packet_read_line_buf(&last->buf, &last->len, NULL);
 268
 269                strbuf_reset(&exp);
 270                strbuf_addf(&exp, "# service=%s", service);
 271                if (strcmp(line, exp.buf))
 272                        die("invalid server response; got '%s'", line);
 273                strbuf_release(&exp);
 274
 275                /* The header can include additional metadata lines, up
 276                 * until a packet flush marker.  Ignore these now, but
 277                 * in the future we might start to scan them.
 278                 */
 279                while (packet_read_line_buf(&last->buf, &last->len, NULL))
 280                        ;
 281
 282                last->proto_git = 1;
 283        }
 284
 285        if (last->proto_git)
 286                last->refs = parse_git_refs(last, for_push);
 287        else
 288                last->refs = parse_info_refs(last);
 289
 290        strbuf_release(&refs_url);
 291        strbuf_release(&exp);
 292        strbuf_release(&type);
 293        strbuf_release(&effective_url);
 294        strbuf_release(&buffer);
 295        last_discovery = last;
 296        return last;
 297}
 298
 299static struct ref *get_refs(int for_push)
 300{
 301        struct discovery *heads;
 302
 303        if (for_push)
 304                heads = discover_refs("git-receive-pack", for_push);
 305        else
 306                heads = discover_refs("git-upload-pack", for_push);
 307
 308        return heads->refs;
 309}
 310
 311static void output_refs(struct ref *refs)
 312{
 313        struct ref *posn;
 314        for (posn = refs; posn; posn = posn->next) {
 315                if (posn->symref)
 316                        printf("@%s %s\n", posn->symref, posn->name);
 317                else
 318                        printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
 319        }
 320        printf("\n");
 321        fflush(stdout);
 322}
 323
 324struct rpc_state {
 325        const char *service_name;
 326        const char **argv;
 327        struct strbuf *stdin_preamble;
 328        char *service_url;
 329        char *hdr_content_type;
 330        char *hdr_accept;
 331        char *buf;
 332        size_t alloc;
 333        size_t len;
 334        size_t pos;
 335        int in;
 336        int out;
 337        struct strbuf result;
 338        unsigned gzip_request : 1;
 339        unsigned initial_buffer : 1;
 340};
 341
 342static size_t rpc_out(void *ptr, size_t eltsize,
 343                size_t nmemb, void *buffer_)
 344{
 345        size_t max = eltsize * nmemb;
 346        struct rpc_state *rpc = buffer_;
 347        size_t avail = rpc->len - rpc->pos;
 348
 349        if (!avail) {
 350                rpc->initial_buffer = 0;
 351                avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 352                if (!avail)
 353                        return 0;
 354                rpc->pos = 0;
 355                rpc->len = avail;
 356        }
 357
 358        if (max < avail)
 359                avail = max;
 360        memcpy(ptr, rpc->buf + rpc->pos, avail);
 361        rpc->pos += avail;
 362        return avail;
 363}
 364
 365#ifndef NO_CURL_IOCTL
 366static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 367{
 368        struct rpc_state *rpc = clientp;
 369
 370        switch (cmd) {
 371        case CURLIOCMD_NOP:
 372                return CURLIOE_OK;
 373
 374        case CURLIOCMD_RESTARTREAD:
 375                if (rpc->initial_buffer) {
 376                        rpc->pos = 0;
 377                        return CURLIOE_OK;
 378                }
 379                fprintf(stderr, "Unable to rewind rpc post data - try increasing http.postBuffer\n");
 380                return CURLIOE_FAILRESTART;
 381
 382        default:
 383                return CURLIOE_UNKNOWNCMD;
 384        }
 385}
 386#endif
 387
 388static size_t rpc_in(char *ptr, size_t eltsize,
 389                size_t nmemb, void *buffer_)
 390{
 391        size_t size = eltsize * nmemb;
 392        struct rpc_state *rpc = buffer_;
 393        write_or_die(rpc->in, ptr, size);
 394        return size;
 395}
 396
 397static int run_slot(struct active_request_slot *slot)
 398{
 399        int err;
 400        struct slot_results results;
 401
 402        slot->results = &results;
 403        slot->curl_result = curl_easy_perform(slot->curl);
 404        finish_active_slot(slot);
 405
 406        err = handle_curl_result(&results);
 407        if (err != HTTP_OK && err != HTTP_REAUTH) {
 408                error("RPC failed; result=%d, HTTP code = %ld",
 409                      results.curl_result, results.http_code);
 410        }
 411
 412        return err;
 413}
 414
 415static int probe_rpc(struct rpc_state *rpc)
 416{
 417        struct active_request_slot *slot;
 418        struct curl_slist *headers = NULL;
 419        struct strbuf buf = STRBUF_INIT;
 420        int err;
 421
 422        slot = get_active_slot();
 423
 424        headers = curl_slist_append(headers, rpc->hdr_content_type);
 425        headers = curl_slist_append(headers, rpc->hdr_accept);
 426
 427        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 428        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 429        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 430        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 431        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 432        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 433        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 434        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 435        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 436
 437        err = run_slot(slot);
 438
 439        curl_slist_free_all(headers);
 440        strbuf_release(&buf);
 441        return err;
 442}
 443
 444static int post_rpc(struct rpc_state *rpc)
 445{
 446        struct active_request_slot *slot;
 447        struct curl_slist *headers = NULL;
 448        int use_gzip = rpc->gzip_request;
 449        char *gzip_body = NULL;
 450        size_t gzip_size = 0;
 451        int err, large_request = 0;
 452
 453        /* Try to load the entire request, if we can fit it into the
 454         * allocated buffer space we can use HTTP/1.0 and avoid the
 455         * chunked encoding mess.
 456         */
 457        while (1) {
 458                size_t left = rpc->alloc - rpc->len;
 459                char *buf = rpc->buf + rpc->len;
 460                int n;
 461
 462                if (left < LARGE_PACKET_MAX) {
 463                        large_request = 1;
 464                        use_gzip = 0;
 465                        break;
 466                }
 467
 468                n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 469                if (!n)
 470                        break;
 471                rpc->len += n;
 472        }
 473
 474        if (large_request) {
 475                do {
 476                        err = probe_rpc(rpc);
 477                        if (err == HTTP_REAUTH)
 478                                credential_fill(&http_auth);
 479                } while (err == HTTP_REAUTH);
 480                if (err != HTTP_OK)
 481                        return -1;
 482        }
 483
 484        headers = curl_slist_append(headers, rpc->hdr_content_type);
 485        headers = curl_slist_append(headers, rpc->hdr_accept);
 486        headers = curl_slist_append(headers, "Expect:");
 487
 488retry:
 489        slot = get_active_slot();
 490
 491        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 492        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 493        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 494        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 495
 496        if (large_request) {
 497                /* The request body is large and the size cannot be predicted.
 498                 * We must use chunked encoding to send it.
 499                 */
 500                headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 501                rpc->initial_buffer = 1;
 502                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 503                curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 504#ifndef NO_CURL_IOCTL
 505                curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 506                curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 507#endif
 508                if (options.verbosity > 1) {
 509                        fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 510                        fflush(stderr);
 511                }
 512
 513        } else if (gzip_body) {
 514                /*
 515                 * If we are looping to retry authentication, then the previous
 516                 * run will have set up the headers and gzip buffer already,
 517                 * and we just need to send it.
 518                 */
 519                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 520                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 521
 522        } else if (use_gzip && 1024 < rpc->len) {
 523                /* The client backend isn't giving us compressed data so
 524                 * we can try to deflate it ourselves, this may save on.
 525                 * the transfer time.
 526                 */
 527                git_zstream stream;
 528                int ret;
 529
 530                memset(&stream, 0, sizeof(stream));
 531                git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 532                gzip_size = git_deflate_bound(&stream, rpc->len);
 533                gzip_body = xmalloc(gzip_size);
 534
 535                stream.next_in = (unsigned char *)rpc->buf;
 536                stream.avail_in = rpc->len;
 537                stream.next_out = (unsigned char *)gzip_body;
 538                stream.avail_out = gzip_size;
 539
 540                ret = git_deflate(&stream, Z_FINISH);
 541                if (ret != Z_STREAM_END)
 542                        die("cannot deflate request; zlib deflate error %d", ret);
 543
 544                ret = git_deflate_end_gently(&stream);
 545                if (ret != Z_OK)
 546                        die("cannot deflate request; zlib end error %d", ret);
 547
 548                gzip_size = stream.total_out;
 549
 550                headers = curl_slist_append(headers, "Content-Encoding: gzip");
 551                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 552                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 553
 554                if (options.verbosity > 1) {
 555                        fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 556                                rpc->service_name,
 557                                (unsigned long)rpc->len, (unsigned long)gzip_size);
 558                        fflush(stderr);
 559                }
 560        } else {
 561                /* We know the complete request size in advance, use the
 562                 * more normal Content-Length approach.
 563                 */
 564                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 565                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 566                if (options.verbosity > 1) {
 567                        fprintf(stderr, "POST %s (%lu bytes)\n",
 568                                rpc->service_name, (unsigned long)rpc->len);
 569                        fflush(stderr);
 570                }
 571        }
 572
 573        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 574        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 575        curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 576
 577        err = run_slot(slot);
 578        if (err == HTTP_REAUTH && !large_request) {
 579                credential_fill(&http_auth);
 580                goto retry;
 581        }
 582        if (err != HTTP_OK)
 583                err = -1;
 584
 585        curl_slist_free_all(headers);
 586        free(gzip_body);
 587        return err;
 588}
 589
 590static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 591{
 592        const char *svc = rpc->service_name;
 593        struct strbuf buf = STRBUF_INIT;
 594        struct strbuf *preamble = rpc->stdin_preamble;
 595        struct child_process client;
 596        int err = 0;
 597
 598        memset(&client, 0, sizeof(client));
 599        client.in = -1;
 600        client.out = -1;
 601        client.git_cmd = 1;
 602        client.argv = rpc->argv;
 603        if (start_command(&client))
 604                exit(1);
 605        if (preamble)
 606                write_or_die(client.in, preamble->buf, preamble->len);
 607        if (heads)
 608                write_or_die(client.in, heads->buf, heads->len);
 609
 610        rpc->alloc = http_post_buffer;
 611        rpc->buf = xmalloc(rpc->alloc);
 612        rpc->in = client.in;
 613        rpc->out = client.out;
 614        strbuf_init(&rpc->result, 0);
 615
 616        strbuf_addf(&buf, "%s%s", url.buf, svc);
 617        rpc->service_url = strbuf_detach(&buf, NULL);
 618
 619        strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 620        rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 621
 622        strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 623        rpc->hdr_accept = strbuf_detach(&buf, NULL);
 624
 625        while (!err) {
 626                int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 627                if (!n)
 628                        break;
 629                rpc->pos = 0;
 630                rpc->len = n;
 631                err |= post_rpc(rpc);
 632        }
 633
 634        close(client.in);
 635        client.in = -1;
 636        if (!err) {
 637                strbuf_read(&rpc->result, client.out, 0);
 638        } else {
 639                char buf[4096];
 640                for (;;)
 641                        if (xread(client.out, buf, sizeof(buf)) <= 0)
 642                                break;
 643        }
 644
 645        close(client.out);
 646        client.out = -1;
 647
 648        err |= finish_command(&client);
 649        free(rpc->service_url);
 650        free(rpc->hdr_content_type);
 651        free(rpc->hdr_accept);
 652        free(rpc->buf);
 653        strbuf_release(&buf);
 654        return err;
 655}
 656
 657static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 658{
 659        struct walker *walker;
 660        char **targets = xmalloc(nr_heads * sizeof(char*));
 661        int ret, i;
 662
 663        if (options.depth)
 664                die("dumb http transport does not support --depth");
 665        for (i = 0; i < nr_heads; i++)
 666                targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 667
 668        walker = get_http_walker(url.buf);
 669        walker->get_all = 1;
 670        walker->get_tree = 1;
 671        walker->get_history = 1;
 672        walker->get_verbosely = options.verbosity >= 3;
 673        walker->get_recover = 0;
 674        ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 675        walker_free(walker);
 676
 677        for (i = 0; i < nr_heads; i++)
 678                free(targets[i]);
 679        free(targets);
 680
 681        return ret ? error("Fetch failed.") : 0;
 682}
 683
 684static int fetch_git(struct discovery *heads,
 685        int nr_heads, struct ref **to_fetch)
 686{
 687        struct rpc_state rpc;
 688        struct strbuf preamble = STRBUF_INIT;
 689        char *depth_arg = NULL;
 690        int argc = 0, i, err;
 691        const char *argv[16];
 692
 693        argv[argc++] = "fetch-pack";
 694        argv[argc++] = "--stateless-rpc";
 695        argv[argc++] = "--stdin";
 696        argv[argc++] = "--lock-pack";
 697        if (options.followtags)
 698                argv[argc++] = "--include-tag";
 699        if (options.thin)
 700                argv[argc++] = "--thin";
 701        if (options.verbosity >= 3) {
 702                argv[argc++] = "-v";
 703                argv[argc++] = "-v";
 704        }
 705        if (options.check_self_contained_and_connected)
 706                argv[argc++] = "--check-self-contained-and-connected";
 707        if (!options.progress)
 708                argv[argc++] = "--no-progress";
 709        if (options.depth) {
 710                struct strbuf buf = STRBUF_INIT;
 711                strbuf_addf(&buf, "--depth=%lu", options.depth);
 712                depth_arg = strbuf_detach(&buf, NULL);
 713                argv[argc++] = depth_arg;
 714        }
 715        argv[argc++] = url.buf;
 716        argv[argc++] = NULL;
 717
 718        for (i = 0; i < nr_heads; i++) {
 719                struct ref *ref = to_fetch[i];
 720                if (!ref->name || !*ref->name)
 721                        die("cannot fetch by sha1 over smart http");
 722                packet_buf_write(&preamble, "%s\n", ref->name);
 723        }
 724        packet_buf_flush(&preamble);
 725
 726        memset(&rpc, 0, sizeof(rpc));
 727        rpc.service_name = "git-upload-pack",
 728        rpc.argv = argv;
 729        rpc.stdin_preamble = &preamble;
 730        rpc.gzip_request = 1;
 731
 732        err = rpc_service(&rpc, heads);
 733        if (rpc.result.len)
 734                write_or_die(1, rpc.result.buf, rpc.result.len);
 735        strbuf_release(&rpc.result);
 736        strbuf_release(&preamble);
 737        free(depth_arg);
 738        return err;
 739}
 740
 741static int fetch(int nr_heads, struct ref **to_fetch)
 742{
 743        struct discovery *d = discover_refs("git-upload-pack", 0);
 744        if (d->proto_git)
 745                return fetch_git(d, nr_heads, to_fetch);
 746        else
 747                return fetch_dumb(nr_heads, to_fetch);
 748}
 749
 750static void parse_fetch(struct strbuf *buf)
 751{
 752        struct ref **to_fetch = NULL;
 753        struct ref *list_head = NULL;
 754        struct ref **list = &list_head;
 755        int alloc_heads = 0, nr_heads = 0;
 756
 757        do {
 758                if (!prefixcmp(buf->buf, "fetch ")) {
 759                        char *p = buf->buf + strlen("fetch ");
 760                        char *name;
 761                        struct ref *ref;
 762                        unsigned char old_sha1[20];
 763
 764                        if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 765                                die("protocol error: expected sha/ref, got %s'", p);
 766                        if (p[40] == ' ')
 767                                name = p + 41;
 768                        else if (!p[40])
 769                                name = "";
 770                        else
 771                                die("protocol error: expected sha/ref, got %s'", p);
 772
 773                        ref = alloc_ref(name);
 774                        hashcpy(ref->old_sha1, old_sha1);
 775
 776                        *list = ref;
 777                        list = &ref->next;
 778
 779                        ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 780                        to_fetch[nr_heads++] = ref;
 781                }
 782                else
 783                        die("http transport does not support %s", buf->buf);
 784
 785                strbuf_reset(buf);
 786                if (strbuf_getline(buf, stdin, '\n') == EOF)
 787                        return;
 788                if (!*buf->buf)
 789                        break;
 790        } while (1);
 791
 792        if (fetch(nr_heads, to_fetch))
 793                exit(128); /* error already reported */
 794        free_refs(list_head);
 795        free(to_fetch);
 796
 797        printf("\n");
 798        fflush(stdout);
 799        strbuf_reset(buf);
 800}
 801
 802static int push_dav(int nr_spec, char **specs)
 803{
 804        const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 805        int argc = 0, i;
 806
 807        argv[argc++] = "http-push";
 808        argv[argc++] = "--helper-status";
 809        if (options.dry_run)
 810                argv[argc++] = "--dry-run";
 811        if (options.verbosity > 1)
 812                argv[argc++] = "--verbose";
 813        argv[argc++] = url.buf;
 814        for (i = 0; i < nr_spec; i++)
 815                argv[argc++] = specs[i];
 816        argv[argc++] = NULL;
 817
 818        if (run_command_v_opt(argv, RUN_GIT_CMD))
 819                die("git-%s failed", argv[0]);
 820        free(argv);
 821        return 0;
 822}
 823
 824static int push_git(struct discovery *heads, int nr_spec, char **specs)
 825{
 826        struct rpc_state rpc;
 827        int i, err;
 828        struct argv_array args;
 829        struct string_list_item *cas_option;
 830
 831        argv_array_init(&args);
 832        argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
 833                         NULL);
 834
 835        if (options.thin)
 836                argv_array_push(&args, "--thin");
 837        if (options.dry_run)
 838                argv_array_push(&args, "--dry-run");
 839        if (options.verbosity == 0)
 840                argv_array_push(&args, "--quiet");
 841        else if (options.verbosity > 1)
 842                argv_array_push(&args, "--verbose");
 843        argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
 844        for_each_string_list_item(cas_option, &cas_options)
 845                argv_array_push(&args, cas_option->string);
 846        argv_array_push(&args, url.buf);
 847        for (i = 0; i < nr_spec; i++)
 848                argv_array_push(&args, specs[i]);
 849
 850        memset(&rpc, 0, sizeof(rpc));
 851        rpc.service_name = "git-receive-pack",
 852        rpc.argv = args.argv;
 853
 854        err = rpc_service(&rpc, heads);
 855        if (rpc.result.len)
 856                write_or_die(1, rpc.result.buf, rpc.result.len);
 857        strbuf_release(&rpc.result);
 858        argv_array_clear(&args);
 859        return err;
 860}
 861
 862static int push(int nr_spec, char **specs)
 863{
 864        struct discovery *heads = discover_refs("git-receive-pack", 1);
 865        int ret;
 866
 867        if (heads->proto_git)
 868                ret = push_git(heads, nr_spec, specs);
 869        else
 870                ret = push_dav(nr_spec, specs);
 871        free_discovery(heads);
 872        return ret;
 873}
 874
 875static void parse_push(struct strbuf *buf)
 876{
 877        char **specs = NULL;
 878        int alloc_spec = 0, nr_spec = 0, i, ret;
 879
 880        do {
 881                if (!prefixcmp(buf->buf, "push ")) {
 882                        ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 883                        specs[nr_spec++] = xstrdup(buf->buf + 5);
 884                }
 885                else
 886                        die("http transport does not support %s", buf->buf);
 887
 888                strbuf_reset(buf);
 889                if (strbuf_getline(buf, stdin, '\n') == EOF)
 890                        goto free_specs;
 891                if (!*buf->buf)
 892                        break;
 893        } while (1);
 894
 895        ret = push(nr_spec, specs);
 896        printf("\n");
 897        fflush(stdout);
 898
 899        if (ret)
 900                exit(128); /* error already reported */
 901
 902 free_specs:
 903        for (i = 0; i < nr_spec; i++)
 904                free(specs[i]);
 905        free(specs);
 906}
 907
 908int main(int argc, const char **argv)
 909{
 910        struct strbuf buf = STRBUF_INIT;
 911        int nongit;
 912
 913        git_extract_argv0_path(argv[0]);
 914        setup_git_directory_gently(&nongit);
 915        if (argc < 2) {
 916                fprintf(stderr, "Remote needed\n");
 917                return 1;
 918        }
 919
 920        options.verbosity = 1;
 921        options.progress = !!isatty(2);
 922        options.thin = 1;
 923
 924        remote = remote_get(argv[1]);
 925
 926        if (argc > 2) {
 927                end_url_with_slash(&url, argv[2]);
 928        } else {
 929                end_url_with_slash(&url, remote->url[0]);
 930        }
 931
 932        http_init(remote, url.buf, 0);
 933
 934        do {
 935                if (strbuf_getline(&buf, stdin, '\n') == EOF) {
 936                        if (ferror(stdin))
 937                                fprintf(stderr, "Error reading command stream\n");
 938                        else
 939                                fprintf(stderr, "Unexpected end of command stream\n");
 940                        return 1;
 941                }
 942                if (buf.len == 0)
 943                        break;
 944                if (!prefixcmp(buf.buf, "fetch ")) {
 945                        if (nongit)
 946                                die("Fetch attempted without a local repo");
 947                        parse_fetch(&buf);
 948
 949                } else if (!strcmp(buf.buf, "list") || !prefixcmp(buf.buf, "list ")) {
 950                        int for_push = !!strstr(buf.buf + 4, "for-push");
 951                        output_refs(get_refs(for_push));
 952
 953                } else if (!prefixcmp(buf.buf, "push ")) {
 954                        parse_push(&buf);
 955
 956                } else if (!prefixcmp(buf.buf, "option ")) {
 957                        char *name = buf.buf + strlen("option ");
 958                        char *value = strchr(name, ' ');
 959                        int result;
 960
 961                        if (value)
 962                                *value++ = '\0';
 963                        else
 964                                value = "true";
 965
 966                        result = set_option(name, value);
 967                        if (!result)
 968                                printf("ok\n");
 969                        else if (result < 0)
 970                                printf("error invalid value\n");
 971                        else
 972                                printf("unsupported\n");
 973                        fflush(stdout);
 974
 975                } else if (!strcmp(buf.buf, "capabilities")) {
 976                        printf("fetch\n");
 977                        printf("option\n");
 978                        printf("push\n");
 979                        printf("check-connectivity\n");
 980                        printf("\n");
 981                        fflush(stdout);
 982                } else {
 983                        fprintf(stderr, "Unknown command '%s'\n", buf.buf);
 984                        return 1;
 985                }
 986                strbuf_reset(&buf);
 987        } while (1);
 988
 989        http_cleanup();
 990
 991        return 0;
 992}