Andrew's git / gitweb.git / remote-curl.c
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remote-curl.con commit Merge branch 'da/difftool' (3f78278)
   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                push_cert : 1;
  30};
  31static struct options options;
  32static struct string_list cas_options = STRING_LIST_INIT_DUP;
  33
  34static int set_option(const char *name, const char *value)
  35{
  36        if (!strcmp(name, "verbosity")) {
  37                char *end;
  38                int v = strtol(value, &end, 10);
  39                if (value == end || *end)
  40                        return -1;
  41                options.verbosity = v;
  42                return 0;
  43        }
  44        else if (!strcmp(name, "progress")) {
  45                if (!strcmp(value, "true"))
  46                        options.progress = 1;
  47                else if (!strcmp(value, "false"))
  48                        options.progress = 0;
  49                else
  50                        return -1;
  51                return 0;
  52        }
  53        else if (!strcmp(name, "depth")) {
  54                char *end;
  55                unsigned long v = strtoul(value, &end, 10);
  56                if (value == end || *end)
  57                        return -1;
  58                options.depth = v;
  59                return 0;
  60        }
  61        else if (!strcmp(name, "followtags")) {
  62                if (!strcmp(value, "true"))
  63                        options.followtags = 1;
  64                else if (!strcmp(value, "false"))
  65                        options.followtags = 0;
  66                else
  67                        return -1;
  68                return 0;
  69        }
  70        else if (!strcmp(name, "dry-run")) {
  71                if (!strcmp(value, "true"))
  72                        options.dry_run = 1;
  73                else if (!strcmp(value, "false"))
  74                        options.dry_run = 0;
  75                else
  76                        return -1;
  77                return 0;
  78        }
  79        else if (!strcmp(name, "check-connectivity")) {
  80                if (!strcmp(value, "true"))
  81                        options.check_self_contained_and_connected = 1;
  82                else if (!strcmp(value, "false"))
  83                        options.check_self_contained_and_connected = 0;
  84                else
  85                        return -1;
  86                return 0;
  87        }
  88        else if (!strcmp(name, "cas")) {
  89                struct strbuf val = STRBUF_INIT;
  90                strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
  91                string_list_append(&cas_options, val.buf);
  92                strbuf_release(&val);
  93                return 0;
  94        } else if (!strcmp(name, "cloning")) {
  95                if (!strcmp(value, "true"))
  96                        options.cloning = 1;
  97                else if (!strcmp(value, "false"))
  98                        options.cloning = 0;
  99                else
 100                        return -1;
 101                return 0;
 102        } else if (!strcmp(name, "update-shallow")) {
 103                if (!strcmp(value, "true"))
 104                        options.update_shallow = 1;
 105                else if (!strcmp(value, "false"))
 106                        options.update_shallow = 0;
 107                else
 108                        return -1;
 109                return 0;
 110        } else if (!strcmp(name, "pushcert")) {
 111                if (!strcmp(value, "true"))
 112                        options.push_cert = 1;
 113                else if (!strcmp(value, "false"))
 114                        options.push_cert = 0;
 115                else
 116                        return -1;
 117                return 0;
 118        } else {
 119                return 1 /* unsupported */;
 120        }
 121}
 122
 123struct discovery {
 124        const char *service;
 125        char *buf_alloc;
 126        char *buf;
 127        size_t len;
 128        struct ref *refs;
 129        struct sha1_array shallow;
 130        unsigned proto_git : 1;
 131};
 132static struct discovery *last_discovery;
 133
 134static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 135{
 136        struct ref *list = NULL;
 137        get_remote_heads(-1, heads->buf, heads->len, &list,
 138                         for_push ? REF_NORMAL : 0, NULL, &heads->shallow);
 139        return list;
 140}
 141
 142static struct ref *parse_info_refs(struct discovery *heads)
 143{
 144        char *data, *start, *mid;
 145        char *ref_name;
 146        int i = 0;
 147
 148        struct ref *refs = NULL;
 149        struct ref *ref = NULL;
 150        struct ref *last_ref = NULL;
 151
 152        data = heads->buf;
 153        start = NULL;
 154        mid = data;
 155        while (i < heads->len) {
 156                if (!start) {
 157                        start = &data[i];
 158                }
 159                if (data[i] == '\t')
 160                        mid = &data[i];
 161                if (data[i] == '\n') {
 162                        if (mid - start != 40)
 163                                die("%sinfo/refs not valid: is this a git repository?",
 164                                    url.buf);
 165                        data[i] = 0;
 166                        ref_name = mid + 1;
 167                        ref = xmalloc(sizeof(struct ref) +
 168                                      strlen(ref_name) + 1);
 169                        memset(ref, 0, sizeof(struct ref));
 170                        strcpy(ref->name, ref_name);
 171                        get_sha1_hex(start, ref->old_sha1);
 172                        if (!refs)
 173                                refs = ref;
 174                        if (last_ref)
 175                                last_ref->next = ref;
 176                        last_ref = ref;
 177                        start = NULL;
 178                }
 179                i++;
 180        }
 181
 182        ref = alloc_ref("HEAD");
 183        if (!http_fetch_ref(url.buf, ref) &&
 184            !resolve_remote_symref(ref, refs)) {
 185                ref->next = refs;
 186                refs = ref;
 187        } else {
 188                free(ref);
 189        }
 190
 191        return refs;
 192}
 193
 194static void free_discovery(struct discovery *d)
 195{
 196        if (d) {
 197                if (d == last_discovery)
 198                        last_discovery = NULL;
 199                free(d->shallow.sha1);
 200                free(d->buf_alloc);
 201                free_refs(d->refs);
 202                free(d);
 203        }
 204}
 205
 206static int show_http_message(struct strbuf *type, struct strbuf *charset,
 207                             struct strbuf *msg)
 208{
 209        const char *p, *eol;
 210
 211        /*
 212         * We only show text/plain parts, as other types are likely
 213         * to be ugly to look at on the user's terminal.
 214         */
 215        if (strcmp(type->buf, "text/plain"))
 216                return -1;
 217        if (charset->len)
 218                strbuf_reencode(msg, charset->buf, get_log_output_encoding());
 219
 220        strbuf_trim(msg);
 221        if (!msg->len)
 222                return -1;
 223
 224        p = msg->buf;
 225        do {
 226                eol = strchrnul(p, '\n');
 227                fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 228                p = eol + 1;
 229        } while(*eol);
 230        return 0;
 231}
 232
 233static struct discovery *discover_refs(const char *service, int for_push)
 234{
 235        struct strbuf exp = STRBUF_INIT;
 236        struct strbuf type = STRBUF_INIT;
 237        struct strbuf charset = STRBUF_INIT;
 238        struct strbuf buffer = STRBUF_INIT;
 239        struct strbuf refs_url = STRBUF_INIT;
 240        struct strbuf effective_url = STRBUF_INIT;
 241        struct discovery *last = last_discovery;
 242        int http_ret, maybe_smart = 0;
 243        struct http_get_options options;
 244
 245        if (last && !strcmp(service, last->service))
 246                return last;
 247        free_discovery(last);
 248
 249        strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 250        if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
 251             git_env_bool("GIT_SMART_HTTP", 1)) {
 252                maybe_smart = 1;
 253                if (!strchr(url.buf, '?'))
 254                        strbuf_addch(&refs_url, '?');
 255                else
 256                        strbuf_addch(&refs_url, '&');
 257                strbuf_addf(&refs_url, "service=%s", service);
 258        }
 259
 260        memset(&options, 0, sizeof(options));
 261        options.content_type = &type;
 262        options.charset = &charset;
 263        options.effective_url = &effective_url;
 264        options.base_url = &url;
 265        options.no_cache = 1;
 266        options.keep_error = 1;
 267
 268        http_ret = http_get_strbuf(refs_url.buf, &buffer, &options);
 269        switch (http_ret) {
 270        case HTTP_OK:
 271                break;
 272        case HTTP_MISSING_TARGET:
 273                show_http_message(&type, &charset, &buffer);
 274                die("repository '%s' not found", url.buf);
 275        case HTTP_NOAUTH:
 276                show_http_message(&type, &charset, &buffer);
 277                die("Authentication failed for '%s'", url.buf);
 278        default:
 279                show_http_message(&type, &charset, &buffer);
 280                die("unable to access '%s': %s", url.buf, curl_errorstr);
 281        }
 282
 283        last= xcalloc(1, sizeof(*last_discovery));
 284        last->service = service;
 285        last->buf_alloc = strbuf_detach(&buffer, &last->len);
 286        last->buf = last->buf_alloc;
 287
 288        strbuf_addf(&exp, "application/x-%s-advertisement", service);
 289        if (maybe_smart &&
 290            (5 <= last->len && last->buf[4] == '#') &&
 291            !strbuf_cmp(&exp, &type)) {
 292                char *line;
 293
 294                /*
 295                 * smart HTTP response; validate that the service
 296                 * pkt-line matches our request.
 297                 */
 298                line = packet_read_line_buf(&last->buf, &last->len, NULL);
 299
 300                strbuf_reset(&exp);
 301                strbuf_addf(&exp, "# service=%s", service);
 302                if (strcmp(line, exp.buf))
 303                        die("invalid server response; got '%s'", line);
 304                strbuf_release(&exp);
 305
 306                /* The header can include additional metadata lines, up
 307                 * until a packet flush marker.  Ignore these now, but
 308                 * in the future we might start to scan them.
 309                 */
 310                while (packet_read_line_buf(&last->buf, &last->len, NULL))
 311                        ;
 312
 313                last->proto_git = 1;
 314        }
 315
 316        if (last->proto_git)
 317                last->refs = parse_git_refs(last, for_push);
 318        else
 319                last->refs = parse_info_refs(last);
 320
 321        strbuf_release(&refs_url);
 322        strbuf_release(&exp);
 323        strbuf_release(&type);
 324        strbuf_release(&charset);
 325        strbuf_release(&effective_url);
 326        strbuf_release(&buffer);
 327        last_discovery = last;
 328        return last;
 329}
 330
 331static struct ref *get_refs(int for_push)
 332{
 333        struct discovery *heads;
 334
 335        if (for_push)
 336                heads = discover_refs("git-receive-pack", for_push);
 337        else
 338                heads = discover_refs("git-upload-pack", for_push);
 339
 340        return heads->refs;
 341}
 342
 343static void output_refs(struct ref *refs)
 344{
 345        struct ref *posn;
 346        for (posn = refs; posn; posn = posn->next) {
 347                if (posn->symref)
 348                        printf("@%s %s\n", posn->symref, posn->name);
 349                else
 350                        printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
 351        }
 352        printf("\n");
 353        fflush(stdout);
 354}
 355
 356struct rpc_state {
 357        const char *service_name;
 358        const char **argv;
 359        struct strbuf *stdin_preamble;
 360        char *service_url;
 361        char *hdr_content_type;
 362        char *hdr_accept;
 363        char *buf;
 364        size_t alloc;
 365        size_t len;
 366        size_t pos;
 367        int in;
 368        int out;
 369        struct strbuf result;
 370        unsigned gzip_request : 1;
 371        unsigned initial_buffer : 1;
 372};
 373
 374static size_t rpc_out(void *ptr, size_t eltsize,
 375                size_t nmemb, void *buffer_)
 376{
 377        size_t max = eltsize * nmemb;
 378        struct rpc_state *rpc = buffer_;
 379        size_t avail = rpc->len - rpc->pos;
 380
 381        if (!avail) {
 382                rpc->initial_buffer = 0;
 383                avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 384                if (!avail)
 385                        return 0;
 386                rpc->pos = 0;
 387                rpc->len = avail;
 388        }
 389
 390        if (max < avail)
 391                avail = max;
 392        memcpy(ptr, rpc->buf + rpc->pos, avail);
 393        rpc->pos += avail;
 394        return avail;
 395}
 396
 397#ifndef NO_CURL_IOCTL
 398static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 399{
 400        struct rpc_state *rpc = clientp;
 401
 402        switch (cmd) {
 403        case CURLIOCMD_NOP:
 404                return CURLIOE_OK;
 405
 406        case CURLIOCMD_RESTARTREAD:
 407                if (rpc->initial_buffer) {
 408                        rpc->pos = 0;
 409                        return CURLIOE_OK;
 410                }
 411                error("unable to rewind rpc post data - try increasing http.postBuffer");
 412                return CURLIOE_FAILRESTART;
 413
 414        default:
 415                return CURLIOE_UNKNOWNCMD;
 416        }
 417}
 418#endif
 419
 420static size_t rpc_in(char *ptr, size_t eltsize,
 421                size_t nmemb, void *buffer_)
 422{
 423        size_t size = eltsize * nmemb;
 424        struct rpc_state *rpc = buffer_;
 425        write_or_die(rpc->in, ptr, size);
 426        return size;
 427}
 428
 429static int run_slot(struct active_request_slot *slot,
 430                    struct slot_results *results)
 431{
 432        int err;
 433        struct slot_results results_buf;
 434
 435        if (!results)
 436                results = &results_buf;
 437
 438        err = run_one_slot(slot, results);
 439
 440        if (err != HTTP_OK && err != HTTP_REAUTH) {
 441                error("RPC failed; result=%d, HTTP code = %ld",
 442                      results->curl_result, results->http_code);
 443        }
 444
 445        return err;
 446}
 447
 448static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 449{
 450        struct active_request_slot *slot;
 451        struct curl_slist *headers = NULL;
 452        struct strbuf buf = STRBUF_INIT;
 453        int err;
 454
 455        slot = get_active_slot();
 456
 457        headers = curl_slist_append(headers, rpc->hdr_content_type);
 458        headers = curl_slist_append(headers, rpc->hdr_accept);
 459
 460        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 461        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 462        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 463        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 464        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 465        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 466        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 467        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 468        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 469
 470        err = run_slot(slot, results);
 471
 472        curl_slist_free_all(headers);
 473        strbuf_release(&buf);
 474        return err;
 475}
 476
 477static int post_rpc(struct rpc_state *rpc)
 478{
 479        struct active_request_slot *slot;
 480        struct curl_slist *headers = NULL;
 481        int use_gzip = rpc->gzip_request;
 482        char *gzip_body = NULL;
 483        size_t gzip_size = 0;
 484        int err, large_request = 0;
 485        int needs_100_continue = 0;
 486
 487        /* Try to load the entire request, if we can fit it into the
 488         * allocated buffer space we can use HTTP/1.0 and avoid the
 489         * chunked encoding mess.
 490         */
 491        while (1) {
 492                size_t left = rpc->alloc - rpc->len;
 493                char *buf = rpc->buf + rpc->len;
 494                int n;
 495
 496                if (left < LARGE_PACKET_MAX) {
 497                        large_request = 1;
 498                        use_gzip = 0;
 499                        break;
 500                }
 501
 502                n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 503                if (!n)
 504                        break;
 505                rpc->len += n;
 506        }
 507
 508        if (large_request) {
 509                struct slot_results results;
 510
 511                do {
 512                        err = probe_rpc(rpc, &results);
 513                        if (err == HTTP_REAUTH)
 514                                credential_fill(&http_auth);
 515                } while (err == HTTP_REAUTH);
 516                if (err != HTTP_OK)
 517                        return -1;
 518
 519                if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 520                        needs_100_continue = 1;
 521        }
 522
 523        headers = curl_slist_append(headers, rpc->hdr_content_type);
 524        headers = curl_slist_append(headers, rpc->hdr_accept);
 525        headers = curl_slist_append(headers, needs_100_continue ?
 526                "Expect: 100-continue" : "Expect:");
 527
 528retry:
 529        slot = get_active_slot();
 530
 531        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 532        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 533        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 534        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 535
 536        if (large_request) {
 537                /* The request body is large and the size cannot be predicted.
 538                 * We must use chunked encoding to send it.
 539                 */
 540                headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 541                rpc->initial_buffer = 1;
 542                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 543                curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 544#ifndef NO_CURL_IOCTL
 545                curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 546                curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 547#endif
 548                if (options.verbosity > 1) {
 549                        fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 550                        fflush(stderr);
 551                }
 552
 553        } else if (gzip_body) {
 554                /*
 555                 * If we are looping to retry authentication, then the previous
 556                 * run will have set up the headers and gzip buffer already,
 557                 * and we just need to send it.
 558                 */
 559                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 560                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 561
 562        } else if (use_gzip && 1024 < rpc->len) {
 563                /* The client backend isn't giving us compressed data so
 564                 * we can try to deflate it ourselves, this may save on.
 565                 * the transfer time.
 566                 */
 567                git_zstream stream;
 568                int ret;
 569
 570                memset(&stream, 0, sizeof(stream));
 571                git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 572                gzip_size = git_deflate_bound(&stream, rpc->len);
 573                gzip_body = xmalloc(gzip_size);
 574
 575                stream.next_in = (unsigned char *)rpc->buf;
 576                stream.avail_in = rpc->len;
 577                stream.next_out = (unsigned char *)gzip_body;
 578                stream.avail_out = gzip_size;
 579
 580                ret = git_deflate(&stream, Z_FINISH);
 581                if (ret != Z_STREAM_END)
 582                        die("cannot deflate request; zlib deflate error %d", ret);
 583
 584                ret = git_deflate_end_gently(&stream);
 585                if (ret != Z_OK)
 586                        die("cannot deflate request; zlib end error %d", ret);
 587
 588                gzip_size = stream.total_out;
 589
 590                headers = curl_slist_append(headers, "Content-Encoding: gzip");
 591                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 592                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 593
 594                if (options.verbosity > 1) {
 595                        fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 596                                rpc->service_name,
 597                                (unsigned long)rpc->len, (unsigned long)gzip_size);
 598                        fflush(stderr);
 599                }
 600        } else {
 601                /* We know the complete request size in advance, use the
 602                 * more normal Content-Length approach.
 603                 */
 604                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 605                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 606                if (options.verbosity > 1) {
 607                        fprintf(stderr, "POST %s (%lu bytes)\n",
 608                                rpc->service_name, (unsigned long)rpc->len);
 609                        fflush(stderr);
 610                }
 611        }
 612
 613        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 614        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 615        curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 616
 617        err = run_slot(slot, NULL);
 618        if (err == HTTP_REAUTH && !large_request) {
 619                credential_fill(&http_auth);
 620                goto retry;
 621        }
 622        if (err != HTTP_OK)
 623                err = -1;
 624
 625        curl_slist_free_all(headers);
 626        free(gzip_body);
 627        return err;
 628}
 629
 630static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 631{
 632        const char *svc = rpc->service_name;
 633        struct strbuf buf = STRBUF_INIT;
 634        struct strbuf *preamble = rpc->stdin_preamble;
 635        struct child_process client = CHILD_PROCESS_INIT;
 636        int err = 0;
 637
 638        client.in = -1;
 639        client.out = -1;
 640        client.git_cmd = 1;
 641        client.argv = rpc->argv;
 642        if (start_command(&client))
 643                exit(1);
 644        if (preamble)
 645                write_or_die(client.in, preamble->buf, preamble->len);
 646        if (heads)
 647                write_or_die(client.in, heads->buf, heads->len);
 648
 649        rpc->alloc = http_post_buffer;
 650        rpc->buf = xmalloc(rpc->alloc);
 651        rpc->in = client.in;
 652        rpc->out = client.out;
 653        strbuf_init(&rpc->result, 0);
 654
 655        strbuf_addf(&buf, "%s%s", url.buf, svc);
 656        rpc->service_url = strbuf_detach(&buf, NULL);
 657
 658        strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 659        rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 660
 661        strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 662        rpc->hdr_accept = strbuf_detach(&buf, NULL);
 663
 664        while (!err) {
 665                int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 666                if (!n)
 667                        break;
 668                rpc->pos = 0;
 669                rpc->len = n;
 670                err |= post_rpc(rpc);
 671        }
 672
 673        close(client.in);
 674        client.in = -1;
 675        if (!err) {
 676                strbuf_read(&rpc->result, client.out, 0);
 677        } else {
 678                char buf[4096];
 679                for (;;)
 680                        if (xread(client.out, buf, sizeof(buf)) <= 0)
 681                                break;
 682        }
 683
 684        close(client.out);
 685        client.out = -1;
 686
 687        err |= finish_command(&client);
 688        free(rpc->service_url);
 689        free(rpc->hdr_content_type);
 690        free(rpc->hdr_accept);
 691        free(rpc->buf);
 692        strbuf_release(&buf);
 693        return err;
 694}
 695
 696static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 697{
 698        struct walker *walker;
 699        char **targets = xmalloc(nr_heads * sizeof(char*));
 700        int ret, i;
 701
 702        if (options.depth)
 703                die("dumb http transport does not support --depth");
 704        for (i = 0; i < nr_heads; i++)
 705                targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 706
 707        walker = get_http_walker(url.buf);
 708        walker->get_all = 1;
 709        walker->get_tree = 1;
 710        walker->get_history = 1;
 711        walker->get_verbosely = options.verbosity >= 3;
 712        walker->get_recover = 0;
 713        ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 714        walker_free(walker);
 715
 716        for (i = 0; i < nr_heads; i++)
 717                free(targets[i]);
 718        free(targets);
 719
 720        return ret ? error("fetch failed.") : 0;
 721}
 722
 723static int fetch_git(struct discovery *heads,
 724        int nr_heads, struct ref **to_fetch)
 725{
 726        struct rpc_state rpc;
 727        struct strbuf preamble = STRBUF_INIT;
 728        char *depth_arg = NULL;
 729        int argc = 0, i, err;
 730        const char *argv[17];
 731
 732        argv[argc++] = "fetch-pack";
 733        argv[argc++] = "--stateless-rpc";
 734        argv[argc++] = "--stdin";
 735        argv[argc++] = "--lock-pack";
 736        if (options.followtags)
 737                argv[argc++] = "--include-tag";
 738        if (options.thin)
 739                argv[argc++] = "--thin";
 740        if (options.verbosity >= 3) {
 741                argv[argc++] = "-v";
 742                argv[argc++] = "-v";
 743        }
 744        if (options.check_self_contained_and_connected)
 745                argv[argc++] = "--check-self-contained-and-connected";
 746        if (options.cloning)
 747                argv[argc++] = "--cloning";
 748        if (options.update_shallow)
 749                argv[argc++] = "--update-shallow";
 750        if (!options.progress)
 751                argv[argc++] = "--no-progress";
 752        if (options.depth) {
 753                struct strbuf buf = STRBUF_INIT;
 754                strbuf_addf(&buf, "--depth=%lu", options.depth);
 755                depth_arg = strbuf_detach(&buf, NULL);
 756                argv[argc++] = depth_arg;
 757        }
 758        argv[argc++] = url.buf;
 759        argv[argc++] = NULL;
 760
 761        for (i = 0; i < nr_heads; i++) {
 762                struct ref *ref = to_fetch[i];
 763                if (!ref->name || !*ref->name)
 764                        die("cannot fetch by sha1 over smart http");
 765                packet_buf_write(&preamble, "%s %s\n",
 766                                 sha1_to_hex(ref->old_sha1), ref->name);
 767        }
 768        packet_buf_flush(&preamble);
 769
 770        memset(&rpc, 0, sizeof(rpc));
 771        rpc.service_name = "git-upload-pack",
 772        rpc.argv = argv;
 773        rpc.stdin_preamble = &preamble;
 774        rpc.gzip_request = 1;
 775
 776        err = rpc_service(&rpc, heads);
 777        if (rpc.result.len)
 778                write_or_die(1, rpc.result.buf, rpc.result.len);
 779        strbuf_release(&rpc.result);
 780        strbuf_release(&preamble);
 781        free(depth_arg);
 782        return err;
 783}
 784
 785static int fetch(int nr_heads, struct ref **to_fetch)
 786{
 787        struct discovery *d = discover_refs("git-upload-pack", 0);
 788        if (d->proto_git)
 789                return fetch_git(d, nr_heads, to_fetch);
 790        else
 791                return fetch_dumb(nr_heads, to_fetch);
 792}
 793
 794static void parse_fetch(struct strbuf *buf)
 795{
 796        struct ref **to_fetch = NULL;
 797        struct ref *list_head = NULL;
 798        struct ref **list = &list_head;
 799        int alloc_heads = 0, nr_heads = 0;
 800
 801        do {
 802                const char *p;
 803                if (skip_prefix(buf->buf, "fetch ", &p)) {
 804                        const char *name;
 805                        struct ref *ref;
 806                        unsigned char old_sha1[20];
 807
 808                        if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 809                                die("protocol error: expected sha/ref, got %s'", p);
 810                        if (p[40] == ' ')
 811                                name = p + 41;
 812                        else if (!p[40])
 813                                name = "";
 814                        else
 815                                die("protocol error: expected sha/ref, got %s'", p);
 816
 817                        ref = alloc_ref(name);
 818                        hashcpy(ref->old_sha1, old_sha1);
 819
 820                        *list = ref;
 821                        list = &ref->next;
 822
 823                        ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 824                        to_fetch[nr_heads++] = ref;
 825                }
 826                else
 827                        die("http transport does not support %s", buf->buf);
 828
 829                strbuf_reset(buf);
 830                if (strbuf_getline(buf, stdin, '\n') == EOF)
 831                        return;
 832                if (!*buf->buf)
 833                        break;
 834        } while (1);
 835
 836        if (fetch(nr_heads, to_fetch))
 837                exit(128); /* error already reported */
 838        free_refs(list_head);
 839        free(to_fetch);
 840
 841        printf("\n");
 842        fflush(stdout);
 843        strbuf_reset(buf);
 844}
 845
 846static int push_dav(int nr_spec, char **specs)
 847{
 848        const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 849        int argc = 0, i;
 850
 851        argv[argc++] = "http-push";
 852        argv[argc++] = "--helper-status";
 853        if (options.dry_run)
 854                argv[argc++] = "--dry-run";
 855        if (options.verbosity > 1)
 856                argv[argc++] = "--verbose";
 857        argv[argc++] = url.buf;
 858        for (i = 0; i < nr_spec; i++)
 859                argv[argc++] = specs[i];
 860        argv[argc++] = NULL;
 861
 862        if (run_command_v_opt(argv, RUN_GIT_CMD))
 863                die("git-%s failed", argv[0]);
 864        free(argv);
 865        return 0;
 866}
 867
 868static int push_git(struct discovery *heads, int nr_spec, char **specs)
 869{
 870        struct rpc_state rpc;
 871        int i, err;
 872        struct argv_array args;
 873        struct string_list_item *cas_option;
 874        struct strbuf preamble = STRBUF_INIT;
 875
 876        argv_array_init(&args);
 877        argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
 878                         NULL);
 879
 880        if (options.thin)
 881                argv_array_push(&args, "--thin");
 882        if (options.dry_run)
 883                argv_array_push(&args, "--dry-run");
 884        if (options.push_cert)
 885                argv_array_push(&args, "--signed");
 886        if (options.verbosity == 0)
 887                argv_array_push(&args, "--quiet");
 888        else if (options.verbosity > 1)
 889                argv_array_push(&args, "--verbose");
 890        argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
 891        for_each_string_list_item(cas_option, &cas_options)
 892                argv_array_push(&args, cas_option->string);
 893        argv_array_push(&args, url.buf);
 894
 895        argv_array_push(&args, "--stdin");
 896        for (i = 0; i < nr_spec; i++)
 897                packet_buf_write(&preamble, "%s\n", specs[i]);
 898        packet_buf_flush(&preamble);
 899
 900        memset(&rpc, 0, sizeof(rpc));
 901        rpc.service_name = "git-receive-pack",
 902        rpc.argv = args.argv;
 903        rpc.stdin_preamble = &preamble;
 904
 905        err = rpc_service(&rpc, heads);
 906        if (rpc.result.len)
 907                write_or_die(1, rpc.result.buf, rpc.result.len);
 908        strbuf_release(&rpc.result);
 909        strbuf_release(&preamble);
 910        argv_array_clear(&args);
 911        return err;
 912}
 913
 914static int push(int nr_spec, char **specs)
 915{
 916        struct discovery *heads = discover_refs("git-receive-pack", 1);
 917        int ret;
 918
 919        if (heads->proto_git)
 920                ret = push_git(heads, nr_spec, specs);
 921        else
 922                ret = push_dav(nr_spec, specs);
 923        free_discovery(heads);
 924        return ret;
 925}
 926
 927static void parse_push(struct strbuf *buf)
 928{
 929        char **specs = NULL;
 930        int alloc_spec = 0, nr_spec = 0, i, ret;
 931
 932        do {
 933                if (starts_with(buf->buf, "push ")) {
 934                        ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 935                        specs[nr_spec++] = xstrdup(buf->buf + 5);
 936                }
 937                else
 938                        die("http transport does not support %s", buf->buf);
 939
 940                strbuf_reset(buf);
 941                if (strbuf_getline(buf, stdin, '\n') == EOF)
 942                        goto free_specs;
 943                if (!*buf->buf)
 944                        break;
 945        } while (1);
 946
 947        ret = push(nr_spec, specs);
 948        printf("\n");
 949        fflush(stdout);
 950
 951        if (ret)
 952                exit(128); /* error already reported */
 953
 954 free_specs:
 955        for (i = 0; i < nr_spec; i++)
 956                free(specs[i]);
 957        free(specs);
 958}
 959
 960int main(int argc, const char **argv)
 961{
 962        struct strbuf buf = STRBUF_INIT;
 963        int nongit;
 964
 965        git_extract_argv0_path(argv[0]);
 966        setup_git_directory_gently(&nongit);
 967        if (argc < 2) {
 968                error("remote-curl: usage: git remote-curl <remote> [<url>]");
 969                return 1;
 970        }
 971
 972        options.verbosity = 1;
 973        options.progress = !!isatty(2);
 974        options.thin = 1;
 975
 976        remote = remote_get(argv[1]);
 977
 978        if (argc > 2) {
 979                end_url_with_slash(&url, argv[2]);
 980        } else {
 981                end_url_with_slash(&url, remote->url[0]);
 982        }
 983
 984        http_init(remote, url.buf, 0);
 985
 986        do {
 987                const char *arg;
 988
 989                if (strbuf_getline(&buf, stdin, '\n') == EOF) {
 990                        if (ferror(stdin))
 991                                error("remote-curl: error reading command stream from git");
 992                        return 1;
 993                }
 994                if (buf.len == 0)
 995                        break;
 996                if (starts_with(buf.buf, "fetch ")) {
 997                        if (nongit)
 998                                die("remote-curl: fetch attempted without a local repo");
 999                        parse_fetch(&buf);
1000
1001                } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1002                        int for_push = !!strstr(buf.buf + 4, "for-push");
1003                        output_refs(get_refs(for_push));
1004
1005                } else if (starts_with(buf.buf, "push ")) {
1006                        parse_push(&buf);
1007
1008                } else if (skip_prefix(buf.buf, "option ", &arg)) {
1009                        char *value = strchr(arg, ' ');
1010                        int result;
1011
1012                        if (value)
1013                                *value++ = '\0';
1014                        else
1015                                value = "true";
1016
1017                        result = set_option(arg, value);
1018                        if (!result)
1019                                printf("ok\n");
1020                        else if (result < 0)
1021                                printf("error invalid value\n");
1022                        else
1023                                printf("unsupported\n");
1024                        fflush(stdout);
1025
1026                } else if (!strcmp(buf.buf, "capabilities")) {
1027                        printf("fetch\n");
1028                        printf("option\n");
1029                        printf("push\n");
1030                        printf("check-connectivity\n");
1031                        printf("\n");
1032                        fflush(stdout);
1033                } else {
1034                        error("remote-curl: unknown command '%s' from git", buf.buf);
1035                        return 1;
1036                }
1037                strbuf_reset(&buf);
1038        } while (1);
1039
1040        http_cleanup();
1041
1042        return 0;
1043}