Andrew's git / gitweb.git / remote-curl.c
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remote-curl.con commit smart-http: support shallow fetch/clone (1609488)
   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#include "sha1-array.h"
  14
  15static struct remote *remote;
  16/* always ends with a trailing slash */
  17static struct strbuf url = STRBUF_INIT;
  18
  19struct options {
  20        int verbosity;
  21        unsigned long depth;
  22        unsigned progress : 1,
  23                check_self_contained_and_connected : 1,
  24                cloning : 1,
  25                update_shallow : 1,
  26                followtags : 1,
  27                dry_run : 1,
  28                thin : 1;
  29};
  30static struct options options;
  31static struct string_list cas_options = STRING_LIST_INIT_DUP;
  32
  33static int set_option(const char *name, const char *value)
  34{
  35        if (!strcmp(name, "verbosity")) {
  36                char *end;
  37                int v = strtol(value, &end, 10);
  38                if (value == end || *end)
  39                        return -1;
  40                options.verbosity = v;
  41                return 0;
  42        }
  43        else if (!strcmp(name, "progress")) {
  44                if (!strcmp(value, "true"))
  45                        options.progress = 1;
  46                else if (!strcmp(value, "false"))
  47                        options.progress = 0;
  48                else
  49                        return -1;
  50                return 0;
  51        }
  52        else if (!strcmp(name, "depth")) {
  53                char *end;
  54                unsigned long v = strtoul(value, &end, 10);
  55                if (value == end || *end)
  56                        return -1;
  57                options.depth = v;
  58                return 0;
  59        }
  60        else if (!strcmp(name, "followtags")) {
  61                if (!strcmp(value, "true"))
  62                        options.followtags = 1;
  63                else if (!strcmp(value, "false"))
  64                        options.followtags = 0;
  65                else
  66                        return -1;
  67                return 0;
  68        }
  69        else if (!strcmp(name, "dry-run")) {
  70                if (!strcmp(value, "true"))
  71                        options.dry_run = 1;
  72                else if (!strcmp(value, "false"))
  73                        options.dry_run = 0;
  74                else
  75                        return -1;
  76                return 0;
  77        }
  78        else if (!strcmp(name, "check-connectivity")) {
  79                if (!strcmp(value, "true"))
  80                        options.check_self_contained_and_connected = 1;
  81                else if (!strcmp(value, "false"))
  82                        options.check_self_contained_and_connected = 0;
  83                else
  84                        return -1;
  85                return 0;
  86        }
  87        else if (!strcmp(name, "cas")) {
  88                struct strbuf val = STRBUF_INIT;
  89                strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
  90                string_list_append(&cas_options, val.buf);
  91                strbuf_release(&val);
  92                return 0;
  93        } else if (!strcmp(name, "cloning")) {
  94                if (!strcmp(value, "true"))
  95                        options.cloning = 1;
  96                else if (!strcmp(value, "false"))
  97                        options.cloning = 0;
  98                else
  99                        return -1;
 100                return 0;
 101        } else if (!strcmp(name, "update-shallow")) {
 102                if (!strcmp(value, "true"))
 103                        options.update_shallow = 1;
 104                else if (!strcmp(value, "false"))
 105                        options.update_shallow = 0;
 106                else
 107                        return -1;
 108                return 0;
 109        } else {
 110                return 1 /* unsupported */;
 111        }
 112}
 113
 114struct discovery {
 115        const char *service;
 116        char *buf_alloc;
 117        char *buf;
 118        size_t len;
 119        struct ref *refs;
 120        struct sha1_array shallow;
 121        unsigned proto_git : 1;
 122};
 123static struct discovery *last_discovery;
 124
 125static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 126{
 127        struct ref *list = NULL;
 128        get_remote_heads(-1, heads->buf, heads->len, &list,
 129                         for_push ? REF_NORMAL : 0, NULL, &heads->shallow);
 130        return list;
 131}
 132
 133static struct ref *parse_info_refs(struct discovery *heads)
 134{
 135        char *data, *start, *mid;
 136        char *ref_name;
 137        int i = 0;
 138
 139        struct ref *refs = NULL;
 140        struct ref *ref = NULL;
 141        struct ref *last_ref = NULL;
 142
 143        data = heads->buf;
 144        start = NULL;
 145        mid = data;
 146        while (i < heads->len) {
 147                if (!start) {
 148                        start = &data[i];
 149                }
 150                if (data[i] == '\t')
 151                        mid = &data[i];
 152                if (data[i] == '\n') {
 153                        if (mid - start != 40)
 154                                die("%sinfo/refs not valid: is this a git repository?",
 155                                    url.buf);
 156                        data[i] = 0;
 157                        ref_name = mid + 1;
 158                        ref = xmalloc(sizeof(struct ref) +
 159                                      strlen(ref_name) + 1);
 160                        memset(ref, 0, sizeof(struct ref));
 161                        strcpy(ref->name, ref_name);
 162                        get_sha1_hex(start, ref->old_sha1);
 163                        if (!refs)
 164                                refs = ref;
 165                        if (last_ref)
 166                                last_ref->next = ref;
 167                        last_ref = ref;
 168                        start = NULL;
 169                }
 170                i++;
 171        }
 172
 173        ref = alloc_ref("HEAD");
 174        if (!http_fetch_ref(url.buf, ref) &&
 175            !resolve_remote_symref(ref, refs)) {
 176                ref->next = refs;
 177                refs = ref;
 178        } else {
 179                free(ref);
 180        }
 181
 182        return refs;
 183}
 184
 185static void free_discovery(struct discovery *d)
 186{
 187        if (d) {
 188                if (d == last_discovery)
 189                        last_discovery = NULL;
 190                free(d->shallow.sha1);
 191                free(d->buf_alloc);
 192                free_refs(d->refs);
 193                free(d);
 194        }
 195}
 196
 197static int show_http_message(struct strbuf *type, struct strbuf *msg)
 198{
 199        const char *p, *eol;
 200
 201        /*
 202         * We only show text/plain parts, as other types are likely
 203         * to be ugly to look at on the user's terminal.
 204         *
 205         * TODO should handle "; charset=XXX", and re-encode into
 206         * logoutputencoding
 207         */
 208        if (strcasecmp(type->buf, "text/plain"))
 209                return -1;
 210
 211        strbuf_trim(msg);
 212        if (!msg->len)
 213                return -1;
 214
 215        p = msg->buf;
 216        do {
 217                eol = strchrnul(p, '\n');
 218                fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 219                p = eol + 1;
 220        } while(*eol);
 221        return 0;
 222}
 223
 224static struct discovery* discover_refs(const char *service, int for_push)
 225{
 226        struct strbuf exp = STRBUF_INIT;
 227        struct strbuf type = STRBUF_INIT;
 228        struct strbuf buffer = STRBUF_INIT;
 229        struct strbuf refs_url = STRBUF_INIT;
 230        struct strbuf effective_url = STRBUF_INIT;
 231        struct discovery *last = last_discovery;
 232        int http_ret, maybe_smart = 0;
 233        struct http_get_options options;
 234
 235        if (last && !strcmp(service, last->service))
 236                return last;
 237        free_discovery(last);
 238
 239        strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 240        if ((!prefixcmp(url.buf, "http://") || !prefixcmp(url.buf, "https://")) &&
 241             git_env_bool("GIT_SMART_HTTP", 1)) {
 242                maybe_smart = 1;
 243                if (!strchr(url.buf, '?'))
 244                        strbuf_addch(&refs_url, '?');
 245                else
 246                        strbuf_addch(&refs_url, '&');
 247                strbuf_addf(&refs_url, "service=%s", service);
 248        }
 249
 250        memset(&options, 0, sizeof(options));
 251        options.content_type = &type;
 252        options.effective_url = &effective_url;
 253        options.base_url = &url;
 254        options.no_cache = 1;
 255        options.keep_error = 1;
 256
 257        http_ret = http_get_strbuf(refs_url.buf, &buffer, &options);
 258        switch (http_ret) {
 259        case HTTP_OK:
 260                break;
 261        case HTTP_MISSING_TARGET:
 262                show_http_message(&type, &buffer);
 263                die("repository '%s' not found", url.buf);
 264        case HTTP_NOAUTH:
 265                show_http_message(&type, &buffer);
 266                die("Authentication failed for '%s'", url.buf);
 267        default:
 268                show_http_message(&type, &buffer);
 269                die("unable to access '%s': %s", url.buf, curl_errorstr);
 270        }
 271
 272        last= xcalloc(1, sizeof(*last_discovery));
 273        last->service = service;
 274        last->buf_alloc = strbuf_detach(&buffer, &last->len);
 275        last->buf = last->buf_alloc;
 276
 277        strbuf_addf(&exp, "application/x-%s-advertisement", service);
 278        if (maybe_smart &&
 279            (5 <= last->len && last->buf[4] == '#') &&
 280            !strbuf_cmp(&exp, &type)) {
 281                char *line;
 282
 283                /*
 284                 * smart HTTP response; validate that the service
 285                 * pkt-line matches our request.
 286                 */
 287                line = packet_read_line_buf(&last->buf, &last->len, NULL);
 288
 289                strbuf_reset(&exp);
 290                strbuf_addf(&exp, "# service=%s", service);
 291                if (strcmp(line, exp.buf))
 292                        die("invalid server response; got '%s'", line);
 293                strbuf_release(&exp);
 294
 295                /* The header can include additional metadata lines, up
 296                 * until a packet flush marker.  Ignore these now, but
 297                 * in the future we might start to scan them.
 298                 */
 299                while (packet_read_line_buf(&last->buf, &last->len, NULL))
 300                        ;
 301
 302                last->proto_git = 1;
 303        }
 304
 305        if (last->proto_git)
 306                last->refs = parse_git_refs(last, for_push);
 307        else
 308                last->refs = parse_info_refs(last);
 309
 310        strbuf_release(&refs_url);
 311        strbuf_release(&exp);
 312        strbuf_release(&type);
 313        strbuf_release(&effective_url);
 314        strbuf_release(&buffer);
 315        last_discovery = last;
 316        return last;
 317}
 318
 319static struct ref *get_refs(int for_push)
 320{
 321        struct discovery *heads;
 322
 323        if (for_push)
 324                heads = discover_refs("git-receive-pack", for_push);
 325        else
 326                heads = discover_refs("git-upload-pack", for_push);
 327
 328        return heads->refs;
 329}
 330
 331static void output_refs(struct ref *refs)
 332{
 333        struct ref *posn;
 334        for (posn = refs; posn; posn = posn->next) {
 335                if (posn->symref)
 336                        printf("@%s %s\n", posn->symref, posn->name);
 337                else
 338                        printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
 339        }
 340        printf("\n");
 341        fflush(stdout);
 342}
 343
 344struct rpc_state {
 345        const char *service_name;
 346        const char **argv;
 347        struct strbuf *stdin_preamble;
 348        char *service_url;
 349        char *hdr_content_type;
 350        char *hdr_accept;
 351        char *buf;
 352        size_t alloc;
 353        size_t len;
 354        size_t pos;
 355        int in;
 356        int out;
 357        struct strbuf result;
 358        unsigned gzip_request : 1;
 359        unsigned initial_buffer : 1;
 360};
 361
 362static size_t rpc_out(void *ptr, size_t eltsize,
 363                size_t nmemb, void *buffer_)
 364{
 365        size_t max = eltsize * nmemb;
 366        struct rpc_state *rpc = buffer_;
 367        size_t avail = rpc->len - rpc->pos;
 368
 369        if (!avail) {
 370                rpc->initial_buffer = 0;
 371                avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 372                if (!avail)
 373                        return 0;
 374                rpc->pos = 0;
 375                rpc->len = avail;
 376        }
 377
 378        if (max < avail)
 379                avail = max;
 380        memcpy(ptr, rpc->buf + rpc->pos, avail);
 381        rpc->pos += avail;
 382        return avail;
 383}
 384
 385#ifndef NO_CURL_IOCTL
 386static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 387{
 388        struct rpc_state *rpc = clientp;
 389
 390        switch (cmd) {
 391        case CURLIOCMD_NOP:
 392                return CURLIOE_OK;
 393
 394        case CURLIOCMD_RESTARTREAD:
 395                if (rpc->initial_buffer) {
 396                        rpc->pos = 0;
 397                        return CURLIOE_OK;
 398                }
 399                fprintf(stderr, "Unable to rewind rpc post data - try increasing http.postBuffer\n");
 400                return CURLIOE_FAILRESTART;
 401
 402        default:
 403                return CURLIOE_UNKNOWNCMD;
 404        }
 405}
 406#endif
 407
 408static size_t rpc_in(char *ptr, size_t eltsize,
 409                size_t nmemb, void *buffer_)
 410{
 411        size_t size = eltsize * nmemb;
 412        struct rpc_state *rpc = buffer_;
 413        write_or_die(rpc->in, ptr, size);
 414        return size;
 415}
 416
 417static int run_slot(struct active_request_slot *slot)
 418{
 419        int err;
 420        struct slot_results results;
 421
 422        slot->results = &results;
 423        slot->curl_result = curl_easy_perform(slot->curl);
 424        finish_active_slot(slot);
 425
 426        err = handle_curl_result(&results);
 427        if (err != HTTP_OK && err != HTTP_REAUTH) {
 428                error("RPC failed; result=%d, HTTP code = %ld",
 429                      results.curl_result, results.http_code);
 430        }
 431
 432        return err;
 433}
 434
 435static int probe_rpc(struct rpc_state *rpc)
 436{
 437        struct active_request_slot *slot;
 438        struct curl_slist *headers = NULL;
 439        struct strbuf buf = STRBUF_INIT;
 440        int err;
 441
 442        slot = get_active_slot();
 443
 444        headers = curl_slist_append(headers, rpc->hdr_content_type);
 445        headers = curl_slist_append(headers, rpc->hdr_accept);
 446
 447        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 448        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 449        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 450        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 451        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 452        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 453        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 454        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 455        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 456
 457        err = run_slot(slot);
 458
 459        curl_slist_free_all(headers);
 460        strbuf_release(&buf);
 461        return err;
 462}
 463
 464static int post_rpc(struct rpc_state *rpc)
 465{
 466        struct active_request_slot *slot;
 467        struct curl_slist *headers = NULL;
 468        int use_gzip = rpc->gzip_request;
 469        char *gzip_body = NULL;
 470        size_t gzip_size = 0;
 471        int err, large_request = 0;
 472
 473        /* Try to load the entire request, if we can fit it into the
 474         * allocated buffer space we can use HTTP/1.0 and avoid the
 475         * chunked encoding mess.
 476         */
 477        while (1) {
 478                size_t left = rpc->alloc - rpc->len;
 479                char *buf = rpc->buf + rpc->len;
 480                int n;
 481
 482                if (left < LARGE_PACKET_MAX) {
 483                        large_request = 1;
 484                        use_gzip = 0;
 485                        break;
 486                }
 487
 488                n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 489                if (!n)
 490                        break;
 491                rpc->len += n;
 492        }
 493
 494        if (large_request) {
 495                do {
 496                        err = probe_rpc(rpc);
 497                        if (err == HTTP_REAUTH)
 498                                credential_fill(&http_auth);
 499                } while (err == HTTP_REAUTH);
 500                if (err != HTTP_OK)
 501                        return -1;
 502        }
 503
 504        headers = curl_slist_append(headers, rpc->hdr_content_type);
 505        headers = curl_slist_append(headers, rpc->hdr_accept);
 506        headers = curl_slist_append(headers, "Expect:");
 507
 508retry:
 509        slot = get_active_slot();
 510
 511        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 512        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 513        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 514        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 515
 516        if (large_request) {
 517                /* The request body is large and the size cannot be predicted.
 518                 * We must use chunked encoding to send it.
 519                 */
 520                headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 521                rpc->initial_buffer = 1;
 522                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 523                curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 524#ifndef NO_CURL_IOCTL
 525                curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 526                curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 527#endif
 528                if (options.verbosity > 1) {
 529                        fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 530                        fflush(stderr);
 531                }
 532
 533        } else if (gzip_body) {
 534                /*
 535                 * If we are looping to retry authentication, then the previous
 536                 * run will have set up the headers and gzip buffer already,
 537                 * and we just need to send it.
 538                 */
 539                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 540                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 541
 542        } else if (use_gzip && 1024 < rpc->len) {
 543                /* The client backend isn't giving us compressed data so
 544                 * we can try to deflate it ourselves, this may save on.
 545                 * the transfer time.
 546                 */
 547                git_zstream stream;
 548                int ret;
 549
 550                memset(&stream, 0, sizeof(stream));
 551                git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 552                gzip_size = git_deflate_bound(&stream, rpc->len);
 553                gzip_body = xmalloc(gzip_size);
 554
 555                stream.next_in = (unsigned char *)rpc->buf;
 556                stream.avail_in = rpc->len;
 557                stream.next_out = (unsigned char *)gzip_body;
 558                stream.avail_out = gzip_size;
 559
 560                ret = git_deflate(&stream, Z_FINISH);
 561                if (ret != Z_STREAM_END)
 562                        die("cannot deflate request; zlib deflate error %d", ret);
 563
 564                ret = git_deflate_end_gently(&stream);
 565                if (ret != Z_OK)
 566                        die("cannot deflate request; zlib end error %d", ret);
 567
 568                gzip_size = stream.total_out;
 569
 570                headers = curl_slist_append(headers, "Content-Encoding: gzip");
 571                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 572                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 573
 574                if (options.verbosity > 1) {
 575                        fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 576                                rpc->service_name,
 577                                (unsigned long)rpc->len, (unsigned long)gzip_size);
 578                        fflush(stderr);
 579                }
 580        } else {
 581                /* We know the complete request size in advance, use the
 582                 * more normal Content-Length approach.
 583                 */
 584                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 585                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 586                if (options.verbosity > 1) {
 587                        fprintf(stderr, "POST %s (%lu bytes)\n",
 588                                rpc->service_name, (unsigned long)rpc->len);
 589                        fflush(stderr);
 590                }
 591        }
 592
 593        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 594        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 595        curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 596
 597        err = run_slot(slot);
 598        if (err == HTTP_REAUTH && !large_request) {
 599                credential_fill(&http_auth);
 600                goto retry;
 601        }
 602        if (err != HTTP_OK)
 603                err = -1;
 604
 605        curl_slist_free_all(headers);
 606        free(gzip_body);
 607        return err;
 608}
 609
 610static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 611{
 612        const char *svc = rpc->service_name;
 613        struct strbuf buf = STRBUF_INIT;
 614        struct strbuf *preamble = rpc->stdin_preamble;
 615        struct child_process client;
 616        int err = 0;
 617
 618        memset(&client, 0, sizeof(client));
 619        client.in = -1;
 620        client.out = -1;
 621        client.git_cmd = 1;
 622        client.argv = rpc->argv;
 623        if (start_command(&client))
 624                exit(1);
 625        if (preamble)
 626                write_or_die(client.in, preamble->buf, preamble->len);
 627        if (heads)
 628                write_or_die(client.in, heads->buf, heads->len);
 629
 630        rpc->alloc = http_post_buffer;
 631        rpc->buf = xmalloc(rpc->alloc);
 632        rpc->in = client.in;
 633        rpc->out = client.out;
 634        strbuf_init(&rpc->result, 0);
 635
 636        strbuf_addf(&buf, "%s%s", url.buf, svc);
 637        rpc->service_url = strbuf_detach(&buf, NULL);
 638
 639        strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 640        rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 641
 642        strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 643        rpc->hdr_accept = strbuf_detach(&buf, NULL);
 644
 645        while (!err) {
 646                int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 647                if (!n)
 648                        break;
 649                rpc->pos = 0;
 650                rpc->len = n;
 651                err |= post_rpc(rpc);
 652        }
 653
 654        close(client.in);
 655        client.in = -1;
 656        if (!err) {
 657                strbuf_read(&rpc->result, client.out, 0);
 658        } else {
 659                char buf[4096];
 660                for (;;)
 661                        if (xread(client.out, buf, sizeof(buf)) <= 0)
 662                                break;
 663        }
 664
 665        close(client.out);
 666        client.out = -1;
 667
 668        err |= finish_command(&client);
 669        free(rpc->service_url);
 670        free(rpc->hdr_content_type);
 671        free(rpc->hdr_accept);
 672        free(rpc->buf);
 673        strbuf_release(&buf);
 674        return err;
 675}
 676
 677static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 678{
 679        struct walker *walker;
 680        char **targets = xmalloc(nr_heads * sizeof(char*));
 681        int ret, i;
 682
 683        if (options.depth)
 684                die("dumb http transport does not support --depth");
 685        for (i = 0; i < nr_heads; i++)
 686                targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 687
 688        walker = get_http_walker(url.buf);
 689        walker->get_all = 1;
 690        walker->get_tree = 1;
 691        walker->get_history = 1;
 692        walker->get_verbosely = options.verbosity >= 3;
 693        walker->get_recover = 0;
 694        ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 695        walker_free(walker);
 696
 697        for (i = 0; i < nr_heads; i++)
 698                free(targets[i]);
 699        free(targets);
 700
 701        return ret ? error("Fetch failed.") : 0;
 702}
 703
 704static int fetch_git(struct discovery *heads,
 705        int nr_heads, struct ref **to_fetch)
 706{
 707        struct rpc_state rpc;
 708        struct strbuf preamble = STRBUF_INIT;
 709        char *depth_arg = NULL;
 710        int argc = 0, i, err;
 711        const char *argv[17];
 712
 713        argv[argc++] = "fetch-pack";
 714        argv[argc++] = "--stateless-rpc";
 715        argv[argc++] = "--stdin";
 716        argv[argc++] = "--lock-pack";
 717        if (options.followtags)
 718                argv[argc++] = "--include-tag";
 719        if (options.thin)
 720                argv[argc++] = "--thin";
 721        if (options.verbosity >= 3) {
 722                argv[argc++] = "-v";
 723                argv[argc++] = "-v";
 724        }
 725        if (options.check_self_contained_and_connected)
 726                argv[argc++] = "--check-self-contained-and-connected";
 727        if (options.cloning)
 728                argv[argc++] = "--cloning";
 729        if (options.update_shallow)
 730                argv[argc++] = "--update-shallow";
 731        if (!options.progress)
 732                argv[argc++] = "--no-progress";
 733        if (options.depth) {
 734                struct strbuf buf = STRBUF_INIT;
 735                strbuf_addf(&buf, "--depth=%lu", options.depth);
 736                depth_arg = strbuf_detach(&buf, NULL);
 737                argv[argc++] = depth_arg;
 738        }
 739        argv[argc++] = url.buf;
 740        argv[argc++] = NULL;
 741
 742        for (i = 0; i < nr_heads; i++) {
 743                struct ref *ref = to_fetch[i];
 744                if (!ref->name || !*ref->name)
 745                        die("cannot fetch by sha1 over smart http");
 746                packet_buf_write(&preamble, "%s %s\n",
 747                                 sha1_to_hex(ref->old_sha1), ref->name);
 748        }
 749        packet_buf_flush(&preamble);
 750
 751        memset(&rpc, 0, sizeof(rpc));
 752        rpc.service_name = "git-upload-pack",
 753        rpc.argv = argv;
 754        rpc.stdin_preamble = &preamble;
 755        rpc.gzip_request = 1;
 756
 757        err = rpc_service(&rpc, heads);
 758        if (rpc.result.len)
 759                write_or_die(1, rpc.result.buf, rpc.result.len);
 760        strbuf_release(&rpc.result);
 761        strbuf_release(&preamble);
 762        free(depth_arg);
 763        return err;
 764}
 765
 766static int fetch(int nr_heads, struct ref **to_fetch)
 767{
 768        struct discovery *d = discover_refs("git-upload-pack", 0);
 769        if (d->proto_git)
 770                return fetch_git(d, nr_heads, to_fetch);
 771        else
 772                return fetch_dumb(nr_heads, to_fetch);
 773}
 774
 775static void parse_fetch(struct strbuf *buf)
 776{
 777        struct ref **to_fetch = NULL;
 778        struct ref *list_head = NULL;
 779        struct ref **list = &list_head;
 780        int alloc_heads = 0, nr_heads = 0;
 781
 782        do {
 783                if (!prefixcmp(buf->buf, "fetch ")) {
 784                        char *p = buf->buf + strlen("fetch ");
 785                        char *name;
 786                        struct ref *ref;
 787                        unsigned char old_sha1[20];
 788
 789                        if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 790                                die("protocol error: expected sha/ref, got %s'", p);
 791                        if (p[40] == ' ')
 792                                name = p + 41;
 793                        else if (!p[40])
 794                                name = "";
 795                        else
 796                                die("protocol error: expected sha/ref, got %s'", p);
 797
 798                        ref = alloc_ref(name);
 799                        hashcpy(ref->old_sha1, old_sha1);
 800
 801                        *list = ref;
 802                        list = &ref->next;
 803
 804                        ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 805                        to_fetch[nr_heads++] = ref;
 806                }
 807                else
 808                        die("http transport does not support %s", buf->buf);
 809
 810                strbuf_reset(buf);
 811                if (strbuf_getline(buf, stdin, '\n') == EOF)
 812                        return;
 813                if (!*buf->buf)
 814                        break;
 815        } while (1);
 816
 817        if (fetch(nr_heads, to_fetch))
 818                exit(128); /* error already reported */
 819        free_refs(list_head);
 820        free(to_fetch);
 821
 822        printf("\n");
 823        fflush(stdout);
 824        strbuf_reset(buf);
 825}
 826
 827static int push_dav(int nr_spec, char **specs)
 828{
 829        const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 830        int argc = 0, i;
 831
 832        argv[argc++] = "http-push";
 833        argv[argc++] = "--helper-status";
 834        if (options.dry_run)
 835                argv[argc++] = "--dry-run";
 836        if (options.verbosity > 1)
 837                argv[argc++] = "--verbose";
 838        argv[argc++] = url.buf;
 839        for (i = 0; i < nr_spec; i++)
 840                argv[argc++] = specs[i];
 841        argv[argc++] = NULL;
 842
 843        if (run_command_v_opt(argv, RUN_GIT_CMD))
 844                die("git-%s failed", argv[0]);
 845        free(argv);
 846        return 0;
 847}
 848
 849static int push_git(struct discovery *heads, int nr_spec, char **specs)
 850{
 851        struct rpc_state rpc;
 852        int i, err;
 853        struct argv_array args;
 854        struct string_list_item *cas_option;
 855
 856        argv_array_init(&args);
 857        argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
 858                         NULL);
 859
 860        if (options.thin)
 861                argv_array_push(&args, "--thin");
 862        if (options.dry_run)
 863                argv_array_push(&args, "--dry-run");
 864        if (options.verbosity == 0)
 865                argv_array_push(&args, "--quiet");
 866        else if (options.verbosity > 1)
 867                argv_array_push(&args, "--verbose");
 868        argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
 869        for_each_string_list_item(cas_option, &cas_options)
 870                argv_array_push(&args, cas_option->string);
 871        argv_array_push(&args, url.buf);
 872        for (i = 0; i < nr_spec; i++)
 873                argv_array_push(&args, specs[i]);
 874
 875        memset(&rpc, 0, sizeof(rpc));
 876        rpc.service_name = "git-receive-pack",
 877        rpc.argv = args.argv;
 878
 879        err = rpc_service(&rpc, heads);
 880        if (rpc.result.len)
 881                write_or_die(1, rpc.result.buf, rpc.result.len);
 882        strbuf_release(&rpc.result);
 883        argv_array_clear(&args);
 884        return err;
 885}
 886
 887static int push(int nr_spec, char **specs)
 888{
 889        struct discovery *heads = discover_refs("git-receive-pack", 1);
 890        int ret;
 891
 892        if (heads->proto_git)
 893                ret = push_git(heads, nr_spec, specs);
 894        else
 895                ret = push_dav(nr_spec, specs);
 896        free_discovery(heads);
 897        return ret;
 898}
 899
 900static void parse_push(struct strbuf *buf)
 901{
 902        char **specs = NULL;
 903        int alloc_spec = 0, nr_spec = 0, i, ret;
 904
 905        do {
 906                if (!prefixcmp(buf->buf, "push ")) {
 907                        ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 908                        specs[nr_spec++] = xstrdup(buf->buf + 5);
 909                }
 910                else
 911                        die("http transport does not support %s", buf->buf);
 912
 913                strbuf_reset(buf);
 914                if (strbuf_getline(buf, stdin, '\n') == EOF)
 915                        goto free_specs;
 916                if (!*buf->buf)
 917                        break;
 918        } while (1);
 919
 920        ret = push(nr_spec, specs);
 921        printf("\n");
 922        fflush(stdout);
 923
 924        if (ret)
 925                exit(128); /* error already reported */
 926
 927 free_specs:
 928        for (i = 0; i < nr_spec; i++)
 929                free(specs[i]);
 930        free(specs);
 931}
 932
 933int main(int argc, const char **argv)
 934{
 935        struct strbuf buf = STRBUF_INIT;
 936        int nongit;
 937
 938        git_extract_argv0_path(argv[0]);
 939        setup_git_directory_gently(&nongit);
 940        if (argc < 2) {
 941                fprintf(stderr, "Remote needed\n");
 942                return 1;
 943        }
 944
 945        options.verbosity = 1;
 946        options.progress = !!isatty(2);
 947        options.thin = 1;
 948
 949        remote = remote_get(argv[1]);
 950
 951        if (argc > 2) {
 952                end_url_with_slash(&url, argv[2]);
 953        } else {
 954                end_url_with_slash(&url, remote->url[0]);
 955        }
 956
 957        http_init(remote, url.buf, 0);
 958
 959        do {
 960                if (strbuf_getline(&buf, stdin, '\n') == EOF) {
 961                        if (ferror(stdin))
 962                                fprintf(stderr, "Error reading command stream\n");
 963                        else
 964                                fprintf(stderr, "Unexpected end of command stream\n");
 965                        return 1;
 966                }
 967                if (buf.len == 0)
 968                        break;
 969                if (!prefixcmp(buf.buf, "fetch ")) {
 970                        if (nongit)
 971                                die("Fetch attempted without a local repo");
 972                        parse_fetch(&buf);
 973
 974                } else if (!strcmp(buf.buf, "list") || !prefixcmp(buf.buf, "list ")) {
 975                        int for_push = !!strstr(buf.buf + 4, "for-push");
 976                        output_refs(get_refs(for_push));
 977
 978                } else if (!prefixcmp(buf.buf, "push ")) {
 979                        parse_push(&buf);
 980
 981                } else if (!prefixcmp(buf.buf, "option ")) {
 982                        char *name = buf.buf + strlen("option ");
 983                        char *value = strchr(name, ' ');
 984                        int result;
 985
 986                        if (value)
 987                                *value++ = '\0';
 988                        else
 989                                value = "true";
 990
 991                        result = set_option(name, value);
 992                        if (!result)
 993                                printf("ok\n");
 994                        else if (result < 0)
 995                                printf("error invalid value\n");
 996                        else
 997                                printf("unsupported\n");
 998                        fflush(stdout);
 999
1000                } else if (!strcmp(buf.buf, "capabilities")) {
1001                        printf("fetch\n");
1002                        printf("option\n");
1003                        printf("push\n");
1004                        printf("check-connectivity\n");
1005                        printf("\n");
1006                        fflush(stdout);
1007                } else {
1008                        fprintf(stderr, "Unknown command '%s'\n", buf.buf);
1009                        return 1;
1010                }
1011                strbuf_reset(&buf);
1012        } while (1);
1013
1014        http_cleanup();
1015
1016        return 0;
1017}