Andrew's git / gitweb.git / remote-curl.c
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remote-curl.con commit Merge branch 'jk/pack-objects-no-bitmap-when-splitting' into maint (ebc2e5a)
   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 *charset,
 198                             struct strbuf *msg)
 199{
 200        const char *p, *eol;
 201
 202        /*
 203         * We only show text/plain parts, as other types are likely
 204         * to be ugly to look at on the user's terminal.
 205         */
 206        if (strcmp(type->buf, "text/plain"))
 207                return -1;
 208        if (charset->len)
 209                strbuf_reencode(msg, charset->buf, get_log_output_encoding());
 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 charset = STRBUF_INIT;
 229        struct strbuf buffer = STRBUF_INIT;
 230        struct strbuf refs_url = STRBUF_INIT;
 231        struct strbuf effective_url = STRBUF_INIT;
 232        struct discovery *last = last_discovery;
 233        int http_ret, maybe_smart = 0;
 234        struct http_get_options options;
 235
 236        if (last && !strcmp(service, last->service))
 237                return last;
 238        free_discovery(last);
 239
 240        strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 241        if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
 242             git_env_bool("GIT_SMART_HTTP", 1)) {
 243                maybe_smart = 1;
 244                if (!strchr(url.buf, '?'))
 245                        strbuf_addch(&refs_url, '?');
 246                else
 247                        strbuf_addch(&refs_url, '&');
 248                strbuf_addf(&refs_url, "service=%s", service);
 249        }
 250
 251        memset(&options, 0, sizeof(options));
 252        options.content_type = &type;
 253        options.charset = &charset;
 254        options.effective_url = &effective_url;
 255        options.base_url = &url;
 256        options.no_cache = 1;
 257        options.keep_error = 1;
 258
 259        http_ret = http_get_strbuf(refs_url.buf, &buffer, &options);
 260        switch (http_ret) {
 261        case HTTP_OK:
 262                break;
 263        case HTTP_MISSING_TARGET:
 264                show_http_message(&type, &charset, &buffer);
 265                die("repository '%s' not found", url.buf);
 266        case HTTP_NOAUTH:
 267                show_http_message(&type, &charset, &buffer);
 268                die("Authentication failed for '%s'", url.buf);
 269        default:
 270                show_http_message(&type, &charset, &buffer);
 271                die("unable to access '%s': %s", url.buf, curl_errorstr);
 272        }
 273
 274        last= xcalloc(1, sizeof(*last_discovery));
 275        last->service = service;
 276        last->buf_alloc = strbuf_detach(&buffer, &last->len);
 277        last->buf = last->buf_alloc;
 278
 279        strbuf_addf(&exp, "application/x-%s-advertisement", service);
 280        if (maybe_smart &&
 281            (5 <= last->len && last->buf[4] == '#') &&
 282            !strbuf_cmp(&exp, &type)) {
 283                char *line;
 284
 285                /*
 286                 * smart HTTP response; validate that the service
 287                 * pkt-line matches our request.
 288                 */
 289                line = packet_read_line_buf(&last->buf, &last->len, NULL);
 290
 291                strbuf_reset(&exp);
 292                strbuf_addf(&exp, "# service=%s", service);
 293                if (strcmp(line, exp.buf))
 294                        die("invalid server response; got '%s'", line);
 295                strbuf_release(&exp);
 296
 297                /* The header can include additional metadata lines, up
 298                 * until a packet flush marker.  Ignore these now, but
 299                 * in the future we might start to scan them.
 300                 */
 301                while (packet_read_line_buf(&last->buf, &last->len, NULL))
 302                        ;
 303
 304                last->proto_git = 1;
 305        }
 306
 307        if (last->proto_git)
 308                last->refs = parse_git_refs(last, for_push);
 309        else
 310                last->refs = parse_info_refs(last);
 311
 312        strbuf_release(&refs_url);
 313        strbuf_release(&exp);
 314        strbuf_release(&type);
 315        strbuf_release(&charset);
 316        strbuf_release(&effective_url);
 317        strbuf_release(&buffer);
 318        last_discovery = last;
 319        return last;
 320}
 321
 322static struct ref *get_refs(int for_push)
 323{
 324        struct discovery *heads;
 325
 326        if (for_push)
 327                heads = discover_refs("git-receive-pack", for_push);
 328        else
 329                heads = discover_refs("git-upload-pack", for_push);
 330
 331        return heads->refs;
 332}
 333
 334static void output_refs(struct ref *refs)
 335{
 336        struct ref *posn;
 337        for (posn = refs; posn; posn = posn->next) {
 338                if (posn->symref)
 339                        printf("@%s %s\n", posn->symref, posn->name);
 340                else
 341                        printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
 342        }
 343        printf("\n");
 344        fflush(stdout);
 345}
 346
 347struct rpc_state {
 348        const char *service_name;
 349        const char **argv;
 350        struct strbuf *stdin_preamble;
 351        char *service_url;
 352        char *hdr_content_type;
 353        char *hdr_accept;
 354        char *buf;
 355        size_t alloc;
 356        size_t len;
 357        size_t pos;
 358        int in;
 359        int out;
 360        struct strbuf result;
 361        unsigned gzip_request : 1;
 362        unsigned initial_buffer : 1;
 363};
 364
 365static size_t rpc_out(void *ptr, size_t eltsize,
 366                size_t nmemb, void *buffer_)
 367{
 368        size_t max = eltsize * nmemb;
 369        struct rpc_state *rpc = buffer_;
 370        size_t avail = rpc->len - rpc->pos;
 371
 372        if (!avail) {
 373                rpc->initial_buffer = 0;
 374                avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 375                if (!avail)
 376                        return 0;
 377                rpc->pos = 0;
 378                rpc->len = avail;
 379        }
 380
 381        if (max < avail)
 382                avail = max;
 383        memcpy(ptr, rpc->buf + rpc->pos, avail);
 384        rpc->pos += avail;
 385        return avail;
 386}
 387
 388#ifndef NO_CURL_IOCTL
 389static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 390{
 391        struct rpc_state *rpc = clientp;
 392
 393        switch (cmd) {
 394        case CURLIOCMD_NOP:
 395                return CURLIOE_OK;
 396
 397        case CURLIOCMD_RESTARTREAD:
 398                if (rpc->initial_buffer) {
 399                        rpc->pos = 0;
 400                        return CURLIOE_OK;
 401                }
 402                error("unable to rewind rpc post data - try increasing http.postBuffer");
 403                return CURLIOE_FAILRESTART;
 404
 405        default:
 406                return CURLIOE_UNKNOWNCMD;
 407        }
 408}
 409#endif
 410
 411static size_t rpc_in(char *ptr, size_t eltsize,
 412                size_t nmemb, void *buffer_)
 413{
 414        size_t size = eltsize * nmemb;
 415        struct rpc_state *rpc = buffer_;
 416        write_or_die(rpc->in, ptr, size);
 417        return size;
 418}
 419
 420static int run_slot(struct active_request_slot *slot,
 421                    struct slot_results *results)
 422{
 423        int err;
 424        struct slot_results results_buf;
 425
 426        if (!results)
 427                results = &results_buf;
 428
 429        err = run_one_slot(slot, results);
 430
 431        if (err != HTTP_OK && err != HTTP_REAUTH) {
 432                error("RPC failed; result=%d, HTTP code = %ld",
 433                      results->curl_result, results->http_code);
 434        }
 435
 436        return err;
 437}
 438
 439static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 440{
 441        struct active_request_slot *slot;
 442        struct curl_slist *headers = NULL;
 443        struct strbuf buf = STRBUF_INIT;
 444        int err;
 445
 446        slot = get_active_slot();
 447
 448        headers = curl_slist_append(headers, rpc->hdr_content_type);
 449        headers = curl_slist_append(headers, rpc->hdr_accept);
 450
 451        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 452        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 453        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 454        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 455        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 456        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 457        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 458        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 459        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 460
 461        err = run_slot(slot, results);
 462
 463        curl_slist_free_all(headers);
 464        strbuf_release(&buf);
 465        return err;
 466}
 467
 468static int post_rpc(struct rpc_state *rpc)
 469{
 470        struct active_request_slot *slot;
 471        struct curl_slist *headers = NULL;
 472        int use_gzip = rpc->gzip_request;
 473        char *gzip_body = NULL;
 474        size_t gzip_size = 0;
 475        int err, large_request = 0;
 476        int needs_100_continue = 0;
 477
 478        /* Try to load the entire request, if we can fit it into the
 479         * allocated buffer space we can use HTTP/1.0 and avoid the
 480         * chunked encoding mess.
 481         */
 482        while (1) {
 483                size_t left = rpc->alloc - rpc->len;
 484                char *buf = rpc->buf + rpc->len;
 485                int n;
 486
 487                if (left < LARGE_PACKET_MAX) {
 488                        large_request = 1;
 489                        use_gzip = 0;
 490                        break;
 491                }
 492
 493                n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 494                if (!n)
 495                        break;
 496                rpc->len += n;
 497        }
 498
 499        if (large_request) {
 500                struct slot_results results;
 501
 502                do {
 503                        err = probe_rpc(rpc, &results);
 504                        if (err == HTTP_REAUTH)
 505                                credential_fill(&http_auth);
 506                } while (err == HTTP_REAUTH);
 507                if (err != HTTP_OK)
 508                        return -1;
 509
 510                if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 511                        needs_100_continue = 1;
 512        }
 513
 514        headers = curl_slist_append(headers, rpc->hdr_content_type);
 515        headers = curl_slist_append(headers, rpc->hdr_accept);
 516        headers = curl_slist_append(headers, needs_100_continue ?
 517                "Expect: 100-continue" : "Expect:");
 518
 519retry:
 520        slot = get_active_slot();
 521
 522        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 523        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 524        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 525        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 526
 527        if (large_request) {
 528                /* The request body is large and the size cannot be predicted.
 529                 * We must use chunked encoding to send it.
 530                 */
 531                headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 532                rpc->initial_buffer = 1;
 533                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 534                curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 535#ifndef NO_CURL_IOCTL
 536                curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 537                curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 538#endif
 539                if (options.verbosity > 1) {
 540                        fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 541                        fflush(stderr);
 542                }
 543
 544        } else if (gzip_body) {
 545                /*
 546                 * If we are looping to retry authentication, then the previous
 547                 * run will have set up the headers and gzip buffer already,
 548                 * and we just need to send it.
 549                 */
 550                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 551                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 552
 553        } else if (use_gzip && 1024 < rpc->len) {
 554                /* The client backend isn't giving us compressed data so
 555                 * we can try to deflate it ourselves, this may save on.
 556                 * the transfer time.
 557                 */
 558                git_zstream stream;
 559                int ret;
 560
 561                memset(&stream, 0, sizeof(stream));
 562                git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 563                gzip_size = git_deflate_bound(&stream, rpc->len);
 564                gzip_body = xmalloc(gzip_size);
 565
 566                stream.next_in = (unsigned char *)rpc->buf;
 567                stream.avail_in = rpc->len;
 568                stream.next_out = (unsigned char *)gzip_body;
 569                stream.avail_out = gzip_size;
 570
 571                ret = git_deflate(&stream, Z_FINISH);
 572                if (ret != Z_STREAM_END)
 573                        die("cannot deflate request; zlib deflate error %d", ret);
 574
 575                ret = git_deflate_end_gently(&stream);
 576                if (ret != Z_OK)
 577                        die("cannot deflate request; zlib end error %d", ret);
 578
 579                gzip_size = stream.total_out;
 580
 581                headers = curl_slist_append(headers, "Content-Encoding: gzip");
 582                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 583                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 584
 585                if (options.verbosity > 1) {
 586                        fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 587                                rpc->service_name,
 588                                (unsigned long)rpc->len, (unsigned long)gzip_size);
 589                        fflush(stderr);
 590                }
 591        } else {
 592                /* We know the complete request size in advance, use the
 593                 * more normal Content-Length approach.
 594                 */
 595                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 596                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 597                if (options.verbosity > 1) {
 598                        fprintf(stderr, "POST %s (%lu bytes)\n",
 599                                rpc->service_name, (unsigned long)rpc->len);
 600                        fflush(stderr);
 601                }
 602        }
 603
 604        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 605        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 606        curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 607
 608        err = run_slot(slot, NULL);
 609        if (err == HTTP_REAUTH && !large_request) {
 610                credential_fill(&http_auth);
 611                goto retry;
 612        }
 613        if (err != HTTP_OK)
 614                err = -1;
 615
 616        curl_slist_free_all(headers);
 617        free(gzip_body);
 618        return err;
 619}
 620
 621static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 622{
 623        const char *svc = rpc->service_name;
 624        struct strbuf buf = STRBUF_INIT;
 625        struct strbuf *preamble = rpc->stdin_preamble;
 626        struct child_process client;
 627        int err = 0;
 628
 629        memset(&client, 0, sizeof(client));
 630        client.in = -1;
 631        client.out = -1;
 632        client.git_cmd = 1;
 633        client.argv = rpc->argv;
 634        if (start_command(&client))
 635                exit(1);
 636        if (preamble)
 637                write_or_die(client.in, preamble->buf, preamble->len);
 638        if (heads)
 639                write_or_die(client.in, heads->buf, heads->len);
 640
 641        rpc->alloc = http_post_buffer;
 642        rpc->buf = xmalloc(rpc->alloc);
 643        rpc->in = client.in;
 644        rpc->out = client.out;
 645        strbuf_init(&rpc->result, 0);
 646
 647        strbuf_addf(&buf, "%s%s", url.buf, svc);
 648        rpc->service_url = strbuf_detach(&buf, NULL);
 649
 650        strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 651        rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 652
 653        strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 654        rpc->hdr_accept = strbuf_detach(&buf, NULL);
 655
 656        while (!err) {
 657                int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 658                if (!n)
 659                        break;
 660                rpc->pos = 0;
 661                rpc->len = n;
 662                err |= post_rpc(rpc);
 663        }
 664
 665        close(client.in);
 666        client.in = -1;
 667        if (!err) {
 668                strbuf_read(&rpc->result, client.out, 0);
 669        } else {
 670                char buf[4096];
 671                for (;;)
 672                        if (xread(client.out, buf, sizeof(buf)) <= 0)
 673                                break;
 674        }
 675
 676        close(client.out);
 677        client.out = -1;
 678
 679        err |= finish_command(&client);
 680        free(rpc->service_url);
 681        free(rpc->hdr_content_type);
 682        free(rpc->hdr_accept);
 683        free(rpc->buf);
 684        strbuf_release(&buf);
 685        return err;
 686}
 687
 688static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 689{
 690        struct walker *walker;
 691        char **targets = xmalloc(nr_heads * sizeof(char*));
 692        int ret, i;
 693
 694        if (options.depth)
 695                die("dumb http transport does not support --depth");
 696        for (i = 0; i < nr_heads; i++)
 697                targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 698
 699        walker = get_http_walker(url.buf);
 700        walker->get_all = 1;
 701        walker->get_tree = 1;
 702        walker->get_history = 1;
 703        walker->get_verbosely = options.verbosity >= 3;
 704        walker->get_recover = 0;
 705        ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 706        walker_free(walker);
 707
 708        for (i = 0; i < nr_heads; i++)
 709                free(targets[i]);
 710        free(targets);
 711
 712        return ret ? error("fetch failed.") : 0;
 713}
 714
 715static int fetch_git(struct discovery *heads,
 716        int nr_heads, struct ref **to_fetch)
 717{
 718        struct rpc_state rpc;
 719        struct strbuf preamble = STRBUF_INIT;
 720        char *depth_arg = NULL;
 721        int argc = 0, i, err;
 722        const char *argv[17];
 723
 724        argv[argc++] = "fetch-pack";
 725        argv[argc++] = "--stateless-rpc";
 726        argv[argc++] = "--stdin";
 727        argv[argc++] = "--lock-pack";
 728        if (options.followtags)
 729                argv[argc++] = "--include-tag";
 730        if (options.thin)
 731                argv[argc++] = "--thin";
 732        if (options.verbosity >= 3) {
 733                argv[argc++] = "-v";
 734                argv[argc++] = "-v";
 735        }
 736        if (options.check_self_contained_and_connected)
 737                argv[argc++] = "--check-self-contained-and-connected";
 738        if (options.cloning)
 739                argv[argc++] = "--cloning";
 740        if (options.update_shallow)
 741                argv[argc++] = "--update-shallow";
 742        if (!options.progress)
 743                argv[argc++] = "--no-progress";
 744        if (options.depth) {
 745                struct strbuf buf = STRBUF_INIT;
 746                strbuf_addf(&buf, "--depth=%lu", options.depth);
 747                depth_arg = strbuf_detach(&buf, NULL);
 748                argv[argc++] = depth_arg;
 749        }
 750        argv[argc++] = url.buf;
 751        argv[argc++] = NULL;
 752
 753        for (i = 0; i < nr_heads; i++) {
 754                struct ref *ref = to_fetch[i];
 755                if (!ref->name || !*ref->name)
 756                        die("cannot fetch by sha1 over smart http");
 757                packet_buf_write(&preamble, "%s %s\n",
 758                                 sha1_to_hex(ref->old_sha1), ref->name);
 759        }
 760        packet_buf_flush(&preamble);
 761
 762        memset(&rpc, 0, sizeof(rpc));
 763        rpc.service_name = "git-upload-pack",
 764        rpc.argv = argv;
 765        rpc.stdin_preamble = &preamble;
 766        rpc.gzip_request = 1;
 767
 768        err = rpc_service(&rpc, heads);
 769        if (rpc.result.len)
 770                write_or_die(1, rpc.result.buf, rpc.result.len);
 771        strbuf_release(&rpc.result);
 772        strbuf_release(&preamble);
 773        free(depth_arg);
 774        return err;
 775}
 776
 777static int fetch(int nr_heads, struct ref **to_fetch)
 778{
 779        struct discovery *d = discover_refs("git-upload-pack", 0);
 780        if (d->proto_git)
 781                return fetch_git(d, nr_heads, to_fetch);
 782        else
 783                return fetch_dumb(nr_heads, to_fetch);
 784}
 785
 786static void parse_fetch(struct strbuf *buf)
 787{
 788        struct ref **to_fetch = NULL;
 789        struct ref *list_head = NULL;
 790        struct ref **list = &list_head;
 791        int alloc_heads = 0, nr_heads = 0;
 792
 793        do {
 794                const char *p;
 795                if (skip_prefix(buf->buf, "fetch ", &p)) {
 796                        const char *name;
 797                        struct ref *ref;
 798                        unsigned char old_sha1[20];
 799
 800                        if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 801                                die("protocol error: expected sha/ref, got %s'", p);
 802                        if (p[40] == ' ')
 803                                name = p + 41;
 804                        else if (!p[40])
 805                                name = "";
 806                        else
 807                                die("protocol error: expected sha/ref, got %s'", p);
 808
 809                        ref = alloc_ref(name);
 810                        hashcpy(ref->old_sha1, old_sha1);
 811
 812                        *list = ref;
 813                        list = &ref->next;
 814
 815                        ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 816                        to_fetch[nr_heads++] = ref;
 817                }
 818                else
 819                        die("http transport does not support %s", buf->buf);
 820
 821                strbuf_reset(buf);
 822                if (strbuf_getline(buf, stdin, '\n') == EOF)
 823                        return;
 824                if (!*buf->buf)
 825                        break;
 826        } while (1);
 827
 828        if (fetch(nr_heads, to_fetch))
 829                exit(128); /* error already reported */
 830        free_refs(list_head);
 831        free(to_fetch);
 832
 833        printf("\n");
 834        fflush(stdout);
 835        strbuf_reset(buf);
 836}
 837
 838static int push_dav(int nr_spec, char **specs)
 839{
 840        const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 841        int argc = 0, i;
 842
 843        argv[argc++] = "http-push";
 844        argv[argc++] = "--helper-status";
 845        if (options.dry_run)
 846                argv[argc++] = "--dry-run";
 847        if (options.verbosity > 1)
 848                argv[argc++] = "--verbose";
 849        argv[argc++] = url.buf;
 850        for (i = 0; i < nr_spec; i++)
 851                argv[argc++] = specs[i];
 852        argv[argc++] = NULL;
 853
 854        if (run_command_v_opt(argv, RUN_GIT_CMD))
 855                die("git-%s failed", argv[0]);
 856        free(argv);
 857        return 0;
 858}
 859
 860static int push_git(struct discovery *heads, int nr_spec, char **specs)
 861{
 862        struct rpc_state rpc;
 863        int i, err;
 864        struct argv_array args;
 865        struct string_list_item *cas_option;
 866        struct strbuf preamble = STRBUF_INIT;
 867
 868        argv_array_init(&args);
 869        argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
 870                         NULL);
 871
 872        if (options.thin)
 873                argv_array_push(&args, "--thin");
 874        if (options.dry_run)
 875                argv_array_push(&args, "--dry-run");
 876        if (options.verbosity == 0)
 877                argv_array_push(&args, "--quiet");
 878        else if (options.verbosity > 1)
 879                argv_array_push(&args, "--verbose");
 880        argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
 881        for_each_string_list_item(cas_option, &cas_options)
 882                argv_array_push(&args, cas_option->string);
 883        argv_array_push(&args, url.buf);
 884
 885        argv_array_push(&args, "--stdin");
 886        for (i = 0; i < nr_spec; i++)
 887                packet_buf_write(&preamble, "%s\n", specs[i]);
 888        packet_buf_flush(&preamble);
 889
 890        memset(&rpc, 0, sizeof(rpc));
 891        rpc.service_name = "git-receive-pack",
 892        rpc.argv = args.argv;
 893        rpc.stdin_preamble = &preamble;
 894
 895        err = rpc_service(&rpc, heads);
 896        if (rpc.result.len)
 897                write_or_die(1, rpc.result.buf, rpc.result.len);
 898        strbuf_release(&rpc.result);
 899        strbuf_release(&preamble);
 900        argv_array_clear(&args);
 901        return err;
 902}
 903
 904static int push(int nr_spec, char **specs)
 905{
 906        struct discovery *heads = discover_refs("git-receive-pack", 1);
 907        int ret;
 908
 909        if (heads->proto_git)
 910                ret = push_git(heads, nr_spec, specs);
 911        else
 912                ret = push_dav(nr_spec, specs);
 913        free_discovery(heads);
 914        return ret;
 915}
 916
 917static void parse_push(struct strbuf *buf)
 918{
 919        char **specs = NULL;
 920        int alloc_spec = 0, nr_spec = 0, i, ret;
 921
 922        do {
 923                if (starts_with(buf->buf, "push ")) {
 924                        ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 925                        specs[nr_spec++] = xstrdup(buf->buf + 5);
 926                }
 927                else
 928                        die("http transport does not support %s", buf->buf);
 929
 930                strbuf_reset(buf);
 931                if (strbuf_getline(buf, stdin, '\n') == EOF)
 932                        goto free_specs;
 933                if (!*buf->buf)
 934                        break;
 935        } while (1);
 936
 937        ret = push(nr_spec, specs);
 938        printf("\n");
 939        fflush(stdout);
 940
 941        if (ret)
 942                exit(128); /* error already reported */
 943
 944 free_specs:
 945        for (i = 0; i < nr_spec; i++)
 946                free(specs[i]);
 947        free(specs);
 948}
 949
 950int main(int argc, const char **argv)
 951{
 952        struct strbuf buf = STRBUF_INIT;
 953        int nongit;
 954
 955        git_extract_argv0_path(argv[0]);
 956        setup_git_directory_gently(&nongit);
 957        if (argc < 2) {
 958                error("remote-curl: usage: git remote-curl <remote> [<url>]");
 959                return 1;
 960        }
 961
 962        options.verbosity = 1;
 963        options.progress = !!isatty(2);
 964        options.thin = 1;
 965
 966        remote = remote_get(argv[1]);
 967
 968        if (argc > 2) {
 969                end_url_with_slash(&url, argv[2]);
 970        } else {
 971                end_url_with_slash(&url, remote->url[0]);
 972        }
 973
 974        http_init(remote, url.buf, 0);
 975
 976        do {
 977                const char *arg;
 978
 979                if (strbuf_getline(&buf, stdin, '\n') == EOF) {
 980                        if (ferror(stdin))
 981                                error("remote-curl: error reading command stream from git");
 982                        return 1;
 983                }
 984                if (buf.len == 0)
 985                        break;
 986                if (starts_with(buf.buf, "fetch ")) {
 987                        if (nongit)
 988                                die("remote-curl: fetch attempted without a local repo");
 989                        parse_fetch(&buf);
 990
 991                } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
 992                        int for_push = !!strstr(buf.buf + 4, "for-push");
 993                        output_refs(get_refs(for_push));
 994
 995                } else if (starts_with(buf.buf, "push ")) {
 996                        parse_push(&buf);
 997
 998                } else if (skip_prefix(buf.buf, "option ", &arg)) {
 999                        char *value = strchr(arg, ' ');
1000                        int result;
1001
1002                        if (value)
1003                                *value++ = '\0';
1004                        else
1005                                value = "true";
1006
1007                        result = set_option(arg, value);
1008                        if (!result)
1009                                printf("ok\n");
1010                        else if (result < 0)
1011                                printf("error invalid value\n");
1012                        else
1013                                printf("unsupported\n");
1014                        fflush(stdout);
1015
1016                } else if (!strcmp(buf.buf, "capabilities")) {
1017                        printf("fetch\n");
1018                        printf("option\n");
1019                        printf("push\n");
1020                        printf("check-connectivity\n");
1021                        printf("\n");
1022                        fflush(stdout);
1023                } else {
1024                        error("remote-curl: unknown command '%s' from git", buf.buf);
1025                        return 1;
1026                }
1027                strbuf_reset(&buf);
1028        } while (1);
1029
1030        http_cleanup();
1031
1032        return 0;
1033}