Andrew's git / gitweb.git / remote-curl.c
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remote-curl.con commit Merge branch 'cc/replace-object-info' (b0504a9)
   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 ((starts_with(url.buf, "http://") || starts_with(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                    struct slot_results *results)
 399{
 400        int err;
 401        struct slot_results results_buf;
 402
 403        if (!results)
 404                results = &results_buf;
 405
 406        slot->results = results;
 407        slot->curl_result = curl_easy_perform(slot->curl);
 408        finish_active_slot(slot);
 409
 410        err = handle_curl_result(results);
 411        if (err != HTTP_OK && err != HTTP_REAUTH) {
 412                error("RPC failed; result=%d, HTTP code = %ld",
 413                      results->curl_result, results->http_code);
 414        }
 415
 416        return err;
 417}
 418
 419static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 420{
 421        struct active_request_slot *slot;
 422        struct curl_slist *headers = NULL;
 423        struct strbuf buf = STRBUF_INIT;
 424        int err;
 425
 426        slot = get_active_slot();
 427
 428        headers = curl_slist_append(headers, rpc->hdr_content_type);
 429        headers = curl_slist_append(headers, rpc->hdr_accept);
 430
 431        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 432        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 433        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 434        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 435        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 436        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 437        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 438        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 439        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 440
 441        err = run_slot(slot, results);
 442
 443        curl_slist_free_all(headers);
 444        strbuf_release(&buf);
 445        return err;
 446}
 447
 448static int post_rpc(struct rpc_state *rpc)
 449{
 450        struct active_request_slot *slot;
 451        struct curl_slist *headers = NULL;
 452        int use_gzip = rpc->gzip_request;
 453        char *gzip_body = NULL;
 454        size_t gzip_size = 0;
 455        int err, large_request = 0;
 456        int needs_100_continue = 0;
 457
 458        /* Try to load the entire request, if we can fit it into the
 459         * allocated buffer space we can use HTTP/1.0 and avoid the
 460         * chunked encoding mess.
 461         */
 462        while (1) {
 463                size_t left = rpc->alloc - rpc->len;
 464                char *buf = rpc->buf + rpc->len;
 465                int n;
 466
 467                if (left < LARGE_PACKET_MAX) {
 468                        large_request = 1;
 469                        use_gzip = 0;
 470                        break;
 471                }
 472
 473                n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 474                if (!n)
 475                        break;
 476                rpc->len += n;
 477        }
 478
 479        if (large_request) {
 480                struct slot_results results;
 481
 482                do {
 483                        err = probe_rpc(rpc, &results);
 484                        if (err == HTTP_REAUTH)
 485                                credential_fill(&http_auth);
 486                } while (err == HTTP_REAUTH);
 487                if (err != HTTP_OK)
 488                        return -1;
 489
 490                if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 491                        needs_100_continue = 1;
 492        }
 493
 494        headers = curl_slist_append(headers, rpc->hdr_content_type);
 495        headers = curl_slist_append(headers, rpc->hdr_accept);
 496        headers = curl_slist_append(headers, needs_100_continue ?
 497                "Expect: 100-continue" : "Expect:");
 498
 499retry:
 500        slot = get_active_slot();
 501
 502        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 503        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 504        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 505        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 506
 507        if (large_request) {
 508                /* The request body is large and the size cannot be predicted.
 509                 * We must use chunked encoding to send it.
 510                 */
 511                headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 512                rpc->initial_buffer = 1;
 513                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 514                curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 515#ifndef NO_CURL_IOCTL
 516                curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 517                curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 518#endif
 519                if (options.verbosity > 1) {
 520                        fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 521                        fflush(stderr);
 522                }
 523
 524        } else if (gzip_body) {
 525                /*
 526                 * If we are looping to retry authentication, then the previous
 527                 * run will have set up the headers and gzip buffer already,
 528                 * and we just need to send it.
 529                 */
 530                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 531                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 532
 533        } else if (use_gzip && 1024 < rpc->len) {
 534                /* The client backend isn't giving us compressed data so
 535                 * we can try to deflate it ourselves, this may save on.
 536                 * the transfer time.
 537                 */
 538                git_zstream stream;
 539                int ret;
 540
 541                memset(&stream, 0, sizeof(stream));
 542                git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 543                gzip_size = git_deflate_bound(&stream, rpc->len);
 544                gzip_body = xmalloc(gzip_size);
 545
 546                stream.next_in = (unsigned char *)rpc->buf;
 547                stream.avail_in = rpc->len;
 548                stream.next_out = (unsigned char *)gzip_body;
 549                stream.avail_out = gzip_size;
 550
 551                ret = git_deflate(&stream, Z_FINISH);
 552                if (ret != Z_STREAM_END)
 553                        die("cannot deflate request; zlib deflate error %d", ret);
 554
 555                ret = git_deflate_end_gently(&stream);
 556                if (ret != Z_OK)
 557                        die("cannot deflate request; zlib end error %d", ret);
 558
 559                gzip_size = stream.total_out;
 560
 561                headers = curl_slist_append(headers, "Content-Encoding: gzip");
 562                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 563                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 564
 565                if (options.verbosity > 1) {
 566                        fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 567                                rpc->service_name,
 568                                (unsigned long)rpc->len, (unsigned long)gzip_size);
 569                        fflush(stderr);
 570                }
 571        } else {
 572                /* We know the complete request size in advance, use the
 573                 * more normal Content-Length approach.
 574                 */
 575                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 576                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 577                if (options.verbosity > 1) {
 578                        fprintf(stderr, "POST %s (%lu bytes)\n",
 579                                rpc->service_name, (unsigned long)rpc->len);
 580                        fflush(stderr);
 581                }
 582        }
 583
 584        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 585        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 586        curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 587
 588        err = run_slot(slot, NULL);
 589        if (err == HTTP_REAUTH && !large_request) {
 590                credential_fill(&http_auth);
 591                goto retry;
 592        }
 593        if (err != HTTP_OK)
 594                err = -1;
 595
 596        curl_slist_free_all(headers);
 597        free(gzip_body);
 598        return err;
 599}
 600
 601static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 602{
 603        const char *svc = rpc->service_name;
 604        struct strbuf buf = STRBUF_INIT;
 605        struct strbuf *preamble = rpc->stdin_preamble;
 606        struct child_process client;
 607        int err = 0;
 608
 609        memset(&client, 0, sizeof(client));
 610        client.in = -1;
 611        client.out = -1;
 612        client.git_cmd = 1;
 613        client.argv = rpc->argv;
 614        if (start_command(&client))
 615                exit(1);
 616        if (preamble)
 617                write_or_die(client.in, preamble->buf, preamble->len);
 618        if (heads)
 619                write_or_die(client.in, heads->buf, heads->len);
 620
 621        rpc->alloc = http_post_buffer;
 622        rpc->buf = xmalloc(rpc->alloc);
 623        rpc->in = client.in;
 624        rpc->out = client.out;
 625        strbuf_init(&rpc->result, 0);
 626
 627        strbuf_addf(&buf, "%s%s", url.buf, svc);
 628        rpc->service_url = strbuf_detach(&buf, NULL);
 629
 630        strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 631        rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 632
 633        strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 634        rpc->hdr_accept = strbuf_detach(&buf, NULL);
 635
 636        while (!err) {
 637                int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 638                if (!n)
 639                        break;
 640                rpc->pos = 0;
 641                rpc->len = n;
 642                err |= post_rpc(rpc);
 643        }
 644
 645        close(client.in);
 646        client.in = -1;
 647        if (!err) {
 648                strbuf_read(&rpc->result, client.out, 0);
 649        } else {
 650                char buf[4096];
 651                for (;;)
 652                        if (xread(client.out, buf, sizeof(buf)) <= 0)
 653                                break;
 654        }
 655
 656        close(client.out);
 657        client.out = -1;
 658
 659        err |= finish_command(&client);
 660        free(rpc->service_url);
 661        free(rpc->hdr_content_type);
 662        free(rpc->hdr_accept);
 663        free(rpc->buf);
 664        strbuf_release(&buf);
 665        return err;
 666}
 667
 668static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 669{
 670        struct walker *walker;
 671        char **targets = xmalloc(nr_heads * sizeof(char*));
 672        int ret, i;
 673
 674        if (options.depth)
 675                die("dumb http transport does not support --depth");
 676        for (i = 0; i < nr_heads; i++)
 677                targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 678
 679        walker = get_http_walker(url.buf);
 680        walker->get_all = 1;
 681        walker->get_tree = 1;
 682        walker->get_history = 1;
 683        walker->get_verbosely = options.verbosity >= 3;
 684        walker->get_recover = 0;
 685        ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 686        walker_free(walker);
 687
 688        for (i = 0; i < nr_heads; i++)
 689                free(targets[i]);
 690        free(targets);
 691
 692        return ret ? error("Fetch failed.") : 0;
 693}
 694
 695static int fetch_git(struct discovery *heads,
 696        int nr_heads, struct ref **to_fetch)
 697{
 698        struct rpc_state rpc;
 699        struct strbuf preamble = STRBUF_INIT;
 700        char *depth_arg = NULL;
 701        int argc = 0, i, err;
 702        const char *argv[16];
 703
 704        argv[argc++] = "fetch-pack";
 705        argv[argc++] = "--stateless-rpc";
 706        argv[argc++] = "--stdin";
 707        argv[argc++] = "--lock-pack";
 708        if (options.followtags)
 709                argv[argc++] = "--include-tag";
 710        if (options.thin)
 711                argv[argc++] = "--thin";
 712        if (options.verbosity >= 3) {
 713                argv[argc++] = "-v";
 714                argv[argc++] = "-v";
 715        }
 716        if (options.check_self_contained_and_connected)
 717                argv[argc++] = "--check-self-contained-and-connected";
 718        if (!options.progress)
 719                argv[argc++] = "--no-progress";
 720        if (options.depth) {
 721                struct strbuf buf = STRBUF_INIT;
 722                strbuf_addf(&buf, "--depth=%lu", options.depth);
 723                depth_arg = strbuf_detach(&buf, NULL);
 724                argv[argc++] = depth_arg;
 725        }
 726        argv[argc++] = url.buf;
 727        argv[argc++] = NULL;
 728
 729        for (i = 0; i < nr_heads; i++) {
 730                struct ref *ref = to_fetch[i];
 731                if (!ref->name || !*ref->name)
 732                        die("cannot fetch by sha1 over smart http");
 733                packet_buf_write(&preamble, "%s\n", ref->name);
 734        }
 735        packet_buf_flush(&preamble);
 736
 737        memset(&rpc, 0, sizeof(rpc));
 738        rpc.service_name = "git-upload-pack",
 739        rpc.argv = argv;
 740        rpc.stdin_preamble = &preamble;
 741        rpc.gzip_request = 1;
 742
 743        err = rpc_service(&rpc, heads);
 744        if (rpc.result.len)
 745                write_or_die(1, rpc.result.buf, rpc.result.len);
 746        strbuf_release(&rpc.result);
 747        strbuf_release(&preamble);
 748        free(depth_arg);
 749        return err;
 750}
 751
 752static int fetch(int nr_heads, struct ref **to_fetch)
 753{
 754        struct discovery *d = discover_refs("git-upload-pack", 0);
 755        if (d->proto_git)
 756                return fetch_git(d, nr_heads, to_fetch);
 757        else
 758                return fetch_dumb(nr_heads, to_fetch);
 759}
 760
 761static void parse_fetch(struct strbuf *buf)
 762{
 763        struct ref **to_fetch = NULL;
 764        struct ref *list_head = NULL;
 765        struct ref **list = &list_head;
 766        int alloc_heads = 0, nr_heads = 0;
 767
 768        do {
 769                if (starts_with(buf->buf, "fetch ")) {
 770                        char *p = buf->buf + strlen("fetch ");
 771                        char *name;
 772                        struct ref *ref;
 773                        unsigned char old_sha1[20];
 774
 775                        if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 776                                die("protocol error: expected sha/ref, got %s'", p);
 777                        if (p[40] == ' ')
 778                                name = p + 41;
 779                        else if (!p[40])
 780                                name = "";
 781                        else
 782                                die("protocol error: expected sha/ref, got %s'", p);
 783
 784                        ref = alloc_ref(name);
 785                        hashcpy(ref->old_sha1, old_sha1);
 786
 787                        *list = ref;
 788                        list = &ref->next;
 789
 790                        ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 791                        to_fetch[nr_heads++] = ref;
 792                }
 793                else
 794                        die("http transport does not support %s", buf->buf);
 795
 796                strbuf_reset(buf);
 797                if (strbuf_getline(buf, stdin, '\n') == EOF)
 798                        return;
 799                if (!*buf->buf)
 800                        break;
 801        } while (1);
 802
 803        if (fetch(nr_heads, to_fetch))
 804                exit(128); /* error already reported */
 805        free_refs(list_head);
 806        free(to_fetch);
 807
 808        printf("\n");
 809        fflush(stdout);
 810        strbuf_reset(buf);
 811}
 812
 813static int push_dav(int nr_spec, char **specs)
 814{
 815        const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 816        int argc = 0, i;
 817
 818        argv[argc++] = "http-push";
 819        argv[argc++] = "--helper-status";
 820        if (options.dry_run)
 821                argv[argc++] = "--dry-run";
 822        if (options.verbosity > 1)
 823                argv[argc++] = "--verbose";
 824        argv[argc++] = url.buf;
 825        for (i = 0; i < nr_spec; i++)
 826                argv[argc++] = specs[i];
 827        argv[argc++] = NULL;
 828
 829        if (run_command_v_opt(argv, RUN_GIT_CMD))
 830                die("git-%s failed", argv[0]);
 831        free(argv);
 832        return 0;
 833}
 834
 835static int push_git(struct discovery *heads, int nr_spec, char **specs)
 836{
 837        struct rpc_state rpc;
 838        int i, err;
 839        struct argv_array args;
 840        struct string_list_item *cas_option;
 841
 842        argv_array_init(&args);
 843        argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
 844                         NULL);
 845
 846        if (options.thin)
 847                argv_array_push(&args, "--thin");
 848        if (options.dry_run)
 849                argv_array_push(&args, "--dry-run");
 850        if (options.verbosity == 0)
 851                argv_array_push(&args, "--quiet");
 852        else if (options.verbosity > 1)
 853                argv_array_push(&args, "--verbose");
 854        argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
 855        for_each_string_list_item(cas_option, &cas_options)
 856                argv_array_push(&args, cas_option->string);
 857        argv_array_push(&args, url.buf);
 858        for (i = 0; i < nr_spec; i++)
 859                argv_array_push(&args, specs[i]);
 860
 861        memset(&rpc, 0, sizeof(rpc));
 862        rpc.service_name = "git-receive-pack",
 863        rpc.argv = args.argv;
 864
 865        err = rpc_service(&rpc, heads);
 866        if (rpc.result.len)
 867                write_or_die(1, rpc.result.buf, rpc.result.len);
 868        strbuf_release(&rpc.result);
 869        argv_array_clear(&args);
 870        return err;
 871}
 872
 873static int push(int nr_spec, char **specs)
 874{
 875        struct discovery *heads = discover_refs("git-receive-pack", 1);
 876        int ret;
 877
 878        if (heads->proto_git)
 879                ret = push_git(heads, nr_spec, specs);
 880        else
 881                ret = push_dav(nr_spec, specs);
 882        free_discovery(heads);
 883        return ret;
 884}
 885
 886static void parse_push(struct strbuf *buf)
 887{
 888        char **specs = NULL;
 889        int alloc_spec = 0, nr_spec = 0, i, ret;
 890
 891        do {
 892                if (starts_with(buf->buf, "push ")) {
 893                        ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 894                        specs[nr_spec++] = xstrdup(buf->buf + 5);
 895                }
 896                else
 897                        die("http transport does not support %s", buf->buf);
 898
 899                strbuf_reset(buf);
 900                if (strbuf_getline(buf, stdin, '\n') == EOF)
 901                        goto free_specs;
 902                if (!*buf->buf)
 903                        break;
 904        } while (1);
 905
 906        ret = push(nr_spec, specs);
 907        printf("\n");
 908        fflush(stdout);
 909
 910        if (ret)
 911                exit(128); /* error already reported */
 912
 913 free_specs:
 914        for (i = 0; i < nr_spec; i++)
 915                free(specs[i]);
 916        free(specs);
 917}
 918
 919int main(int argc, const char **argv)
 920{
 921        struct strbuf buf = STRBUF_INIT;
 922        int nongit;
 923
 924        git_extract_argv0_path(argv[0]);
 925        setup_git_directory_gently(&nongit);
 926        if (argc < 2) {
 927                fprintf(stderr, "Remote needed\n");
 928                return 1;
 929        }
 930
 931        options.verbosity = 1;
 932        options.progress = !!isatty(2);
 933        options.thin = 1;
 934
 935        remote = remote_get(argv[1]);
 936
 937        if (argc > 2) {
 938                end_url_with_slash(&url, argv[2]);
 939        } else {
 940                end_url_with_slash(&url, remote->url[0]);
 941        }
 942
 943        http_init(remote, url.buf, 0);
 944
 945        do {
 946                if (strbuf_getline(&buf, stdin, '\n') == EOF) {
 947                        if (ferror(stdin))
 948                                fprintf(stderr, "Error reading command stream\n");
 949                        else
 950                                fprintf(stderr, "Unexpected end of command stream\n");
 951                        return 1;
 952                }
 953                if (buf.len == 0)
 954                        break;
 955                if (starts_with(buf.buf, "fetch ")) {
 956                        if (nongit)
 957                                die("Fetch attempted without a local repo");
 958                        parse_fetch(&buf);
 959
 960                } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
 961                        int for_push = !!strstr(buf.buf + 4, "for-push");
 962                        output_refs(get_refs(for_push));
 963
 964                } else if (starts_with(buf.buf, "push ")) {
 965                        parse_push(&buf);
 966
 967                } else if (starts_with(buf.buf, "option ")) {
 968                        char *name = buf.buf + strlen("option ");
 969                        char *value = strchr(name, ' ');
 970                        int result;
 971
 972                        if (value)
 973                                *value++ = '\0';
 974                        else
 975                                value = "true";
 976
 977                        result = set_option(name, value);
 978                        if (!result)
 979                                printf("ok\n");
 980                        else if (result < 0)
 981                                printf("error invalid value\n");
 982                        else
 983                                printf("unsupported\n");
 984                        fflush(stdout);
 985
 986                } else if (!strcmp(buf.buf, "capabilities")) {
 987                        printf("fetch\n");
 988                        printf("option\n");
 989                        printf("push\n");
 990                        printf("check-connectivity\n");
 991                        printf("\n");
 992                        fflush(stdout);
 993                } else {
 994                        fprintf(stderr, "Unknown command '%s'\n", buf.buf);
 995                        return 1;
 996                }
 997                strbuf_reset(&buf);
 998        } while (1);
 999
1000        http_cleanup();
1001
1002        return 0;
1003}