Andrew's git / gitweb.git / remote-curl.c
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remote-curl.con commit fetch, upload-pack: --deepen=N extends shallow boundary by N commits (cccf74e)
   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#include "send-pack.h"
  15
  16static struct remote *remote;
  17/* always ends with a trailing slash */
  18static struct strbuf url = STRBUF_INIT;
  19
  20struct options {
  21        int verbosity;
  22        unsigned long depth;
  23        char *deepen_since;
  24        struct string_list deepen_not;
  25        unsigned progress : 1,
  26                check_self_contained_and_connected : 1,
  27                cloning : 1,
  28                update_shallow : 1,
  29                followtags : 1,
  30                dry_run : 1,
  31                thin : 1,
  32                /* One of the SEND_PACK_PUSH_CERT_* constants. */
  33                push_cert : 2,
  34                deepen_relative : 1;
  35};
  36static struct options options;
  37static struct string_list cas_options = STRING_LIST_INIT_DUP;
  38
  39static int set_option(const char *name, const char *value)
  40{
  41        if (!strcmp(name, "verbosity")) {
  42                char *end;
  43                int v = strtol(value, &end, 10);
  44                if (value == end || *end)
  45                        return -1;
  46                options.verbosity = v;
  47                return 0;
  48        }
  49        else if (!strcmp(name, "progress")) {
  50                if (!strcmp(value, "true"))
  51                        options.progress = 1;
  52                else if (!strcmp(value, "false"))
  53                        options.progress = 0;
  54                else
  55                        return -1;
  56                return 0;
  57        }
  58        else if (!strcmp(name, "depth")) {
  59                char *end;
  60                unsigned long v = strtoul(value, &end, 10);
  61                if (value == end || *end)
  62                        return -1;
  63                options.depth = v;
  64                return 0;
  65        }
  66        else if (!strcmp(name, "deepen-since")) {
  67                options.deepen_since = xstrdup(value);
  68                return 0;
  69        }
  70        else if (!strcmp(name, "deepen-not")) {
  71                string_list_append(&options.deepen_not, value);
  72                return 0;
  73        }
  74        else if (!strcmp(name, "deepen-relative")) {
  75                if (!strcmp(value, "true"))
  76                        options.deepen_relative = 1;
  77                else if (!strcmp(value, "false"))
  78                        options.deepen_relative = 0;
  79                else
  80                        return -1;
  81                return 0;
  82        }
  83        else if (!strcmp(name, "followtags")) {
  84                if (!strcmp(value, "true"))
  85                        options.followtags = 1;
  86                else if (!strcmp(value, "false"))
  87                        options.followtags = 0;
  88                else
  89                        return -1;
  90                return 0;
  91        }
  92        else if (!strcmp(name, "dry-run")) {
  93                if (!strcmp(value, "true"))
  94                        options.dry_run = 1;
  95                else if (!strcmp(value, "false"))
  96                        options.dry_run = 0;
  97                else
  98                        return -1;
  99                return 0;
 100        }
 101        else if (!strcmp(name, "check-connectivity")) {
 102                if (!strcmp(value, "true"))
 103                        options.check_self_contained_and_connected = 1;
 104                else if (!strcmp(value, "false"))
 105                        options.check_self_contained_and_connected = 0;
 106                else
 107                        return -1;
 108                return 0;
 109        }
 110        else if (!strcmp(name, "cas")) {
 111                struct strbuf val = STRBUF_INIT;
 112                strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
 113                string_list_append(&cas_options, val.buf);
 114                strbuf_release(&val);
 115                return 0;
 116        } else if (!strcmp(name, "cloning")) {
 117                if (!strcmp(value, "true"))
 118                        options.cloning = 1;
 119                else if (!strcmp(value, "false"))
 120                        options.cloning = 0;
 121                else
 122                        return -1;
 123                return 0;
 124        } else if (!strcmp(name, "update-shallow")) {
 125                if (!strcmp(value, "true"))
 126                        options.update_shallow = 1;
 127                else if (!strcmp(value, "false"))
 128                        options.update_shallow = 0;
 129                else
 130                        return -1;
 131                return 0;
 132        } else if (!strcmp(name, "pushcert")) {
 133                if (!strcmp(value, "true"))
 134                        options.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 135                else if (!strcmp(value, "false"))
 136                        options.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 137                else if (!strcmp(value, "if-asked"))
 138                        options.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 139                else
 140                        return -1;
 141                return 0;
 142        } else {
 143                return 1 /* unsupported */;
 144        }
 145}
 146
 147struct discovery {
 148        const char *service;
 149        char *buf_alloc;
 150        char *buf;
 151        size_t len;
 152        struct ref *refs;
 153        struct sha1_array shallow;
 154        unsigned proto_git : 1;
 155};
 156static struct discovery *last_discovery;
 157
 158static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 159{
 160        struct ref *list = NULL;
 161        get_remote_heads(-1, heads->buf, heads->len, &list,
 162                         for_push ? REF_NORMAL : 0, NULL, &heads->shallow);
 163        return list;
 164}
 165
 166static struct ref *parse_info_refs(struct discovery *heads)
 167{
 168        char *data, *start, *mid;
 169        char *ref_name;
 170        int i = 0;
 171
 172        struct ref *refs = NULL;
 173        struct ref *ref = NULL;
 174        struct ref *last_ref = NULL;
 175
 176        data = heads->buf;
 177        start = NULL;
 178        mid = data;
 179        while (i < heads->len) {
 180                if (!start) {
 181                        start = &data[i];
 182                }
 183                if (data[i] == '\t')
 184                        mid = &data[i];
 185                if (data[i] == '\n') {
 186                        if (mid - start != 40)
 187                                die("%sinfo/refs not valid: is this a git repository?",
 188                                    url.buf);
 189                        data[i] = 0;
 190                        ref_name = mid + 1;
 191                        ref = alloc_ref(ref_name);
 192                        get_oid_hex(start, &ref->old_oid);
 193                        if (!refs)
 194                                refs = ref;
 195                        if (last_ref)
 196                                last_ref->next = ref;
 197                        last_ref = ref;
 198                        start = NULL;
 199                }
 200                i++;
 201        }
 202
 203        ref = alloc_ref("HEAD");
 204        if (!http_fetch_ref(url.buf, ref) &&
 205            !resolve_remote_symref(ref, refs)) {
 206                ref->next = refs;
 207                refs = ref;
 208        } else {
 209                free(ref);
 210        }
 211
 212        return refs;
 213}
 214
 215static void free_discovery(struct discovery *d)
 216{
 217        if (d) {
 218                if (d == last_discovery)
 219                        last_discovery = NULL;
 220                free(d->shallow.sha1);
 221                free(d->buf_alloc);
 222                free_refs(d->refs);
 223                free(d);
 224        }
 225}
 226
 227static int show_http_message(struct strbuf *type, struct strbuf *charset,
 228                             struct strbuf *msg)
 229{
 230        const char *p, *eol;
 231
 232        /*
 233         * We only show text/plain parts, as other types are likely
 234         * to be ugly to look at on the user's terminal.
 235         */
 236        if (strcmp(type->buf, "text/plain"))
 237                return -1;
 238        if (charset->len)
 239                strbuf_reencode(msg, charset->buf, get_log_output_encoding());
 240
 241        strbuf_trim(msg);
 242        if (!msg->len)
 243                return -1;
 244
 245        p = msg->buf;
 246        do {
 247                eol = strchrnul(p, '\n');
 248                fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 249                p = eol + 1;
 250        } while(*eol);
 251        return 0;
 252}
 253
 254static struct discovery *discover_refs(const char *service, int for_push)
 255{
 256        struct strbuf exp = STRBUF_INIT;
 257        struct strbuf type = STRBUF_INIT;
 258        struct strbuf charset = STRBUF_INIT;
 259        struct strbuf buffer = STRBUF_INIT;
 260        struct strbuf refs_url = STRBUF_INIT;
 261        struct strbuf effective_url = STRBUF_INIT;
 262        struct discovery *last = last_discovery;
 263        int http_ret, maybe_smart = 0;
 264        struct http_get_options options;
 265
 266        if (last && !strcmp(service, last->service))
 267                return last;
 268        free_discovery(last);
 269
 270        strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 271        if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
 272             git_env_bool("GIT_SMART_HTTP", 1)) {
 273                maybe_smart = 1;
 274                if (!strchr(url.buf, '?'))
 275                        strbuf_addch(&refs_url, '?');
 276                else
 277                        strbuf_addch(&refs_url, '&');
 278                strbuf_addf(&refs_url, "service=%s", service);
 279        }
 280
 281        memset(&options, 0, sizeof(options));
 282        options.content_type = &type;
 283        options.charset = &charset;
 284        options.effective_url = &effective_url;
 285        options.base_url = &url;
 286        options.no_cache = 1;
 287        options.keep_error = 1;
 288
 289        http_ret = http_get_strbuf(refs_url.buf, &buffer, &options);
 290        switch (http_ret) {
 291        case HTTP_OK:
 292                break;
 293        case HTTP_MISSING_TARGET:
 294                show_http_message(&type, &charset, &buffer);
 295                die("repository '%s' not found", url.buf);
 296        case HTTP_NOAUTH:
 297                show_http_message(&type, &charset, &buffer);
 298                die("Authentication failed for '%s'", url.buf);
 299        default:
 300                show_http_message(&type, &charset, &buffer);
 301                die("unable to access '%s': %s", url.buf, curl_errorstr);
 302        }
 303
 304        last= xcalloc(1, sizeof(*last_discovery));
 305        last->service = service;
 306        last->buf_alloc = strbuf_detach(&buffer, &last->len);
 307        last->buf = last->buf_alloc;
 308
 309        strbuf_addf(&exp, "application/x-%s-advertisement", service);
 310        if (maybe_smart &&
 311            (5 <= last->len && last->buf[4] == '#') &&
 312            !strbuf_cmp(&exp, &type)) {
 313                char *line;
 314
 315                /*
 316                 * smart HTTP response; validate that the service
 317                 * pkt-line matches our request.
 318                 */
 319                line = packet_read_line_buf(&last->buf, &last->len, NULL);
 320
 321                strbuf_reset(&exp);
 322                strbuf_addf(&exp, "# service=%s", service);
 323                if (strcmp(line, exp.buf))
 324                        die("invalid server response; got '%s'", line);
 325                strbuf_release(&exp);
 326
 327                /* The header can include additional metadata lines, up
 328                 * until a packet flush marker.  Ignore these now, but
 329                 * in the future we might start to scan them.
 330                 */
 331                while (packet_read_line_buf(&last->buf, &last->len, NULL))
 332                        ;
 333
 334                last->proto_git = 1;
 335        }
 336
 337        if (last->proto_git)
 338                last->refs = parse_git_refs(last, for_push);
 339        else
 340                last->refs = parse_info_refs(last);
 341
 342        strbuf_release(&refs_url);
 343        strbuf_release(&exp);
 344        strbuf_release(&type);
 345        strbuf_release(&charset);
 346        strbuf_release(&effective_url);
 347        strbuf_release(&buffer);
 348        last_discovery = last;
 349        return last;
 350}
 351
 352static struct ref *get_refs(int for_push)
 353{
 354        struct discovery *heads;
 355
 356        if (for_push)
 357                heads = discover_refs("git-receive-pack", for_push);
 358        else
 359                heads = discover_refs("git-upload-pack", for_push);
 360
 361        return heads->refs;
 362}
 363
 364static void output_refs(struct ref *refs)
 365{
 366        struct ref *posn;
 367        for (posn = refs; posn; posn = posn->next) {
 368                if (posn->symref)
 369                        printf("@%s %s\n", posn->symref, posn->name);
 370                else
 371                        printf("%s %s\n", oid_to_hex(&posn->old_oid), posn->name);
 372        }
 373        printf("\n");
 374        fflush(stdout);
 375}
 376
 377struct rpc_state {
 378        const char *service_name;
 379        const char **argv;
 380        struct strbuf *stdin_preamble;
 381        char *service_url;
 382        char *hdr_content_type;
 383        char *hdr_accept;
 384        char *buf;
 385        size_t alloc;
 386        size_t len;
 387        size_t pos;
 388        int in;
 389        int out;
 390        struct strbuf result;
 391        unsigned gzip_request : 1;
 392        unsigned initial_buffer : 1;
 393};
 394
 395static size_t rpc_out(void *ptr, size_t eltsize,
 396                size_t nmemb, void *buffer_)
 397{
 398        size_t max = eltsize * nmemb;
 399        struct rpc_state *rpc = buffer_;
 400        size_t avail = rpc->len - rpc->pos;
 401
 402        if (!avail) {
 403                rpc->initial_buffer = 0;
 404                avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 405                if (!avail)
 406                        return 0;
 407                rpc->pos = 0;
 408                rpc->len = avail;
 409        }
 410
 411        if (max < avail)
 412                avail = max;
 413        memcpy(ptr, rpc->buf + rpc->pos, avail);
 414        rpc->pos += avail;
 415        return avail;
 416}
 417
 418#ifndef NO_CURL_IOCTL
 419static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 420{
 421        struct rpc_state *rpc = clientp;
 422
 423        switch (cmd) {
 424        case CURLIOCMD_NOP:
 425                return CURLIOE_OK;
 426
 427        case CURLIOCMD_RESTARTREAD:
 428                if (rpc->initial_buffer) {
 429                        rpc->pos = 0;
 430                        return CURLIOE_OK;
 431                }
 432                error("unable to rewind rpc post data - try increasing http.postBuffer");
 433                return CURLIOE_FAILRESTART;
 434
 435        default:
 436                return CURLIOE_UNKNOWNCMD;
 437        }
 438}
 439#endif
 440
 441static size_t rpc_in(char *ptr, size_t eltsize,
 442                size_t nmemb, void *buffer_)
 443{
 444        size_t size = eltsize * nmemb;
 445        struct rpc_state *rpc = buffer_;
 446        write_or_die(rpc->in, ptr, size);
 447        return size;
 448}
 449
 450static int run_slot(struct active_request_slot *slot,
 451                    struct slot_results *results)
 452{
 453        int err;
 454        struct slot_results results_buf;
 455
 456        if (!results)
 457                results = &results_buf;
 458
 459        err = run_one_slot(slot, results);
 460
 461        if (err != HTTP_OK && err != HTTP_REAUTH) {
 462                error("RPC failed; result=%d, HTTP code = %ld",
 463                      results->curl_result, results->http_code);
 464        }
 465
 466        return err;
 467}
 468
 469static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 470{
 471        struct active_request_slot *slot;
 472        struct curl_slist *headers = NULL;
 473        struct strbuf buf = STRBUF_INIT;
 474        int err;
 475
 476        slot = get_active_slot();
 477
 478        headers = curl_slist_append(headers, rpc->hdr_content_type);
 479        headers = curl_slist_append(headers, rpc->hdr_accept);
 480
 481        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 482        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 483        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 484        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 485        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 486        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 487        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 488        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 489        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 490
 491        err = run_slot(slot, results);
 492
 493        curl_slist_free_all(headers);
 494        strbuf_release(&buf);
 495        return err;
 496}
 497
 498static int post_rpc(struct rpc_state *rpc)
 499{
 500        struct active_request_slot *slot;
 501        struct curl_slist *headers = NULL;
 502        int use_gzip = rpc->gzip_request;
 503        char *gzip_body = NULL;
 504        size_t gzip_size = 0;
 505        int err, large_request = 0;
 506        int needs_100_continue = 0;
 507
 508        /* Try to load the entire request, if we can fit it into the
 509         * allocated buffer space we can use HTTP/1.0 and avoid the
 510         * chunked encoding mess.
 511         */
 512        while (1) {
 513                size_t left = rpc->alloc - rpc->len;
 514                char *buf = rpc->buf + rpc->len;
 515                int n;
 516
 517                if (left < LARGE_PACKET_MAX) {
 518                        large_request = 1;
 519                        use_gzip = 0;
 520                        break;
 521                }
 522
 523                n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 524                if (!n)
 525                        break;
 526                rpc->len += n;
 527        }
 528
 529        if (large_request) {
 530                struct slot_results results;
 531
 532                do {
 533                        err = probe_rpc(rpc, &results);
 534                        if (err == HTTP_REAUTH)
 535                                credential_fill(&http_auth);
 536                } while (err == HTTP_REAUTH);
 537                if (err != HTTP_OK)
 538                        return -1;
 539
 540                if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 541                        needs_100_continue = 1;
 542        }
 543
 544        headers = curl_slist_append(headers, rpc->hdr_content_type);
 545        headers = curl_slist_append(headers, rpc->hdr_accept);
 546        headers = curl_slist_append(headers, needs_100_continue ?
 547                "Expect: 100-continue" : "Expect:");
 548
 549retry:
 550        slot = get_active_slot();
 551
 552        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 553        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 554        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 555        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 556
 557        if (large_request) {
 558                /* The request body is large and the size cannot be predicted.
 559                 * We must use chunked encoding to send it.
 560                 */
 561                headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 562                rpc->initial_buffer = 1;
 563                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 564                curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 565#ifndef NO_CURL_IOCTL
 566                curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 567                curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 568#endif
 569                if (options.verbosity > 1) {
 570                        fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 571                        fflush(stderr);
 572                }
 573
 574        } else if (gzip_body) {
 575                /*
 576                 * If we are looping to retry authentication, then the previous
 577                 * run will have set up the headers and gzip buffer already,
 578                 * and we just need to send it.
 579                 */
 580                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 581                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 582
 583        } else if (use_gzip && 1024 < rpc->len) {
 584                /* The client backend isn't giving us compressed data so
 585                 * we can try to deflate it ourselves, this may save on.
 586                 * the transfer time.
 587                 */
 588                git_zstream stream;
 589                int ret;
 590
 591                git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 592                gzip_size = git_deflate_bound(&stream, rpc->len);
 593                gzip_body = xmalloc(gzip_size);
 594
 595                stream.next_in = (unsigned char *)rpc->buf;
 596                stream.avail_in = rpc->len;
 597                stream.next_out = (unsigned char *)gzip_body;
 598                stream.avail_out = gzip_size;
 599
 600                ret = git_deflate(&stream, Z_FINISH);
 601                if (ret != Z_STREAM_END)
 602                        die("cannot deflate request; zlib deflate error %d", ret);
 603
 604                ret = git_deflate_end_gently(&stream);
 605                if (ret != Z_OK)
 606                        die("cannot deflate request; zlib end error %d", ret);
 607
 608                gzip_size = stream.total_out;
 609
 610                headers = curl_slist_append(headers, "Content-Encoding: gzip");
 611                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 612                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 613
 614                if (options.verbosity > 1) {
 615                        fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 616                                rpc->service_name,
 617                                (unsigned long)rpc->len, (unsigned long)gzip_size);
 618                        fflush(stderr);
 619                }
 620        } else {
 621                /* We know the complete request size in advance, use the
 622                 * more normal Content-Length approach.
 623                 */
 624                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 625                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 626                if (options.verbosity > 1) {
 627                        fprintf(stderr, "POST %s (%lu bytes)\n",
 628                                rpc->service_name, (unsigned long)rpc->len);
 629                        fflush(stderr);
 630                }
 631        }
 632
 633        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 634        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 635        curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 636
 637        err = run_slot(slot, NULL);
 638        if (err == HTTP_REAUTH && !large_request) {
 639                credential_fill(&http_auth);
 640                goto retry;
 641        }
 642        if (err != HTTP_OK)
 643                err = -1;
 644
 645        curl_slist_free_all(headers);
 646        free(gzip_body);
 647        return err;
 648}
 649
 650static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 651{
 652        const char *svc = rpc->service_name;
 653        struct strbuf buf = STRBUF_INIT;
 654        struct strbuf *preamble = rpc->stdin_preamble;
 655        struct child_process client = CHILD_PROCESS_INIT;
 656        int err = 0;
 657
 658        client.in = -1;
 659        client.out = -1;
 660        client.git_cmd = 1;
 661        client.argv = rpc->argv;
 662        if (start_command(&client))
 663                exit(1);
 664        if (preamble)
 665                write_or_die(client.in, preamble->buf, preamble->len);
 666        if (heads)
 667                write_or_die(client.in, heads->buf, heads->len);
 668
 669        rpc->alloc = http_post_buffer;
 670        rpc->buf = xmalloc(rpc->alloc);
 671        rpc->in = client.in;
 672        rpc->out = client.out;
 673        strbuf_init(&rpc->result, 0);
 674
 675        strbuf_addf(&buf, "%s%s", url.buf, svc);
 676        rpc->service_url = strbuf_detach(&buf, NULL);
 677
 678        strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 679        rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 680
 681        strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 682        rpc->hdr_accept = strbuf_detach(&buf, NULL);
 683
 684        while (!err) {
 685                int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 686                if (!n)
 687                        break;
 688                rpc->pos = 0;
 689                rpc->len = n;
 690                err |= post_rpc(rpc);
 691        }
 692
 693        close(client.in);
 694        client.in = -1;
 695        if (!err) {
 696                strbuf_read(&rpc->result, client.out, 0);
 697        } else {
 698                char buf[4096];
 699                for (;;)
 700                        if (xread(client.out, buf, sizeof(buf)) <= 0)
 701                                break;
 702        }
 703
 704        close(client.out);
 705        client.out = -1;
 706
 707        err |= finish_command(&client);
 708        free(rpc->service_url);
 709        free(rpc->hdr_content_type);
 710        free(rpc->hdr_accept);
 711        free(rpc->buf);
 712        strbuf_release(&buf);
 713        return err;
 714}
 715
 716static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 717{
 718        struct walker *walker;
 719        char **targets = xmalloc(nr_heads * sizeof(char*));
 720        int ret, i;
 721
 722        if (options.depth || options.deepen_since)
 723                die("dumb http transport does not support shallow capabilities");
 724        for (i = 0; i < nr_heads; i++)
 725                targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
 726
 727        walker = get_http_walker(url.buf);
 728        walker->get_all = 1;
 729        walker->get_tree = 1;
 730        walker->get_history = 1;
 731        walker->get_verbosely = options.verbosity >= 3;
 732        walker->get_recover = 0;
 733        ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 734        walker_free(walker);
 735
 736        for (i = 0; i < nr_heads; i++)
 737                free(targets[i]);
 738        free(targets);
 739
 740        return ret ? error("fetch failed.") : 0;
 741}
 742
 743static int fetch_git(struct discovery *heads,
 744        int nr_heads, struct ref **to_fetch)
 745{
 746        struct rpc_state rpc;
 747        struct strbuf preamble = STRBUF_INIT;
 748        int i, err;
 749        struct argv_array args = ARGV_ARRAY_INIT;
 750
 751        argv_array_pushl(&args, "fetch-pack", "--stateless-rpc",
 752                         "--stdin", "--lock-pack", NULL);
 753        if (options.followtags)
 754                argv_array_push(&args, "--include-tag");
 755        if (options.thin)
 756                argv_array_push(&args, "--thin");
 757        if (options.verbosity >= 3)
 758                argv_array_pushl(&args, "-v", "-v", NULL);
 759        if (options.check_self_contained_and_connected)
 760                argv_array_push(&args, "--check-self-contained-and-connected");
 761        if (options.cloning)
 762                argv_array_push(&args, "--cloning");
 763        if (options.update_shallow)
 764                argv_array_push(&args, "--update-shallow");
 765        if (!options.progress)
 766                argv_array_push(&args, "--no-progress");
 767        if (options.depth)
 768                argv_array_pushf(&args, "--depth=%lu", options.depth);
 769        if (options.deepen_since)
 770                argv_array_pushf(&args, "--shallow-since=%s", options.deepen_since);
 771        for (i = 0; i < options.deepen_not.nr; i++)
 772                argv_array_pushf(&args, "--shallow-exclude=%s",
 773                                 options.deepen_not.items[i].string);
 774        if (options.deepen_relative && options.depth)
 775                argv_array_push(&args, "--deepen-relative");
 776        argv_array_push(&args, url.buf);
 777
 778        for (i = 0; i < nr_heads; i++) {
 779                struct ref *ref = to_fetch[i];
 780                if (!*ref->name)
 781                        die("cannot fetch by sha1 over smart http");
 782                packet_buf_write(&preamble, "%s %s\n",
 783                                 oid_to_hex(&ref->old_oid), ref->name);
 784        }
 785        packet_buf_flush(&preamble);
 786
 787        memset(&rpc, 0, sizeof(rpc));
 788        rpc.service_name = "git-upload-pack",
 789        rpc.argv = args.argv;
 790        rpc.stdin_preamble = &preamble;
 791        rpc.gzip_request = 1;
 792
 793        err = rpc_service(&rpc, heads);
 794        if (rpc.result.len)
 795                write_or_die(1, rpc.result.buf, rpc.result.len);
 796        strbuf_release(&rpc.result);
 797        strbuf_release(&preamble);
 798        argv_array_clear(&args);
 799        return err;
 800}
 801
 802static int fetch(int nr_heads, struct ref **to_fetch)
 803{
 804        struct discovery *d = discover_refs("git-upload-pack", 0);
 805        if (d->proto_git)
 806                return fetch_git(d, nr_heads, to_fetch);
 807        else
 808                return fetch_dumb(nr_heads, to_fetch);
 809}
 810
 811static void parse_fetch(struct strbuf *buf)
 812{
 813        struct ref **to_fetch = NULL;
 814        struct ref *list_head = NULL;
 815        struct ref **list = &list_head;
 816        int alloc_heads = 0, nr_heads = 0;
 817
 818        do {
 819                const char *p;
 820                if (skip_prefix(buf->buf, "fetch ", &p)) {
 821                        const char *name;
 822                        struct ref *ref;
 823                        struct object_id old_oid;
 824
 825                        if (get_oid_hex(p, &old_oid))
 826                                die("protocol error: expected sha/ref, got %s'", p);
 827                        if (p[GIT_SHA1_HEXSZ] == ' ')
 828                                name = p + GIT_SHA1_HEXSZ + 1;
 829                        else if (!p[GIT_SHA1_HEXSZ])
 830                                name = "";
 831                        else
 832                                die("protocol error: expected sha/ref, got %s'", p);
 833
 834                        ref = alloc_ref(name);
 835                        oidcpy(&ref->old_oid, &old_oid);
 836
 837                        *list = ref;
 838                        list = &ref->next;
 839
 840                        ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 841                        to_fetch[nr_heads++] = ref;
 842                }
 843                else
 844                        die("http transport does not support %s", buf->buf);
 845
 846                strbuf_reset(buf);
 847                if (strbuf_getline_lf(buf, stdin) == EOF)
 848                        return;
 849                if (!*buf->buf)
 850                        break;
 851        } while (1);
 852
 853        if (fetch(nr_heads, to_fetch))
 854                exit(128); /* error already reported */
 855        free_refs(list_head);
 856        free(to_fetch);
 857
 858        printf("\n");
 859        fflush(stdout);
 860        strbuf_reset(buf);
 861}
 862
 863static int push_dav(int nr_spec, char **specs)
 864{
 865        const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 866        int argc = 0, i;
 867
 868        argv[argc++] = "http-push";
 869        argv[argc++] = "--helper-status";
 870        if (options.dry_run)
 871                argv[argc++] = "--dry-run";
 872        if (options.verbosity > 1)
 873                argv[argc++] = "--verbose";
 874        argv[argc++] = url.buf;
 875        for (i = 0; i < nr_spec; i++)
 876                argv[argc++] = specs[i];
 877        argv[argc++] = NULL;
 878
 879        if (run_command_v_opt(argv, RUN_GIT_CMD))
 880                die("git-%s failed", argv[0]);
 881        free(argv);
 882        return 0;
 883}
 884
 885static int push_git(struct discovery *heads, int nr_spec, char **specs)
 886{
 887        struct rpc_state rpc;
 888        int i, err;
 889        struct argv_array args;
 890        struct string_list_item *cas_option;
 891        struct strbuf preamble = STRBUF_INIT;
 892
 893        argv_array_init(&args);
 894        argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
 895                         NULL);
 896
 897        if (options.thin)
 898                argv_array_push(&args, "--thin");
 899        if (options.dry_run)
 900                argv_array_push(&args, "--dry-run");
 901        if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
 902                argv_array_push(&args, "--signed=yes");
 903        else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
 904                argv_array_push(&args, "--signed=if-asked");
 905        if (options.verbosity == 0)
 906                argv_array_push(&args, "--quiet");
 907        else if (options.verbosity > 1)
 908                argv_array_push(&args, "--verbose");
 909        argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
 910        for_each_string_list_item(cas_option, &cas_options)
 911                argv_array_push(&args, cas_option->string);
 912        argv_array_push(&args, url.buf);
 913
 914        argv_array_push(&args, "--stdin");
 915        for (i = 0; i < nr_spec; i++)
 916                packet_buf_write(&preamble, "%s\n", specs[i]);
 917        packet_buf_flush(&preamble);
 918
 919        memset(&rpc, 0, sizeof(rpc));
 920        rpc.service_name = "git-receive-pack",
 921        rpc.argv = args.argv;
 922        rpc.stdin_preamble = &preamble;
 923
 924        err = rpc_service(&rpc, heads);
 925        if (rpc.result.len)
 926                write_or_die(1, rpc.result.buf, rpc.result.len);
 927        strbuf_release(&rpc.result);
 928        strbuf_release(&preamble);
 929        argv_array_clear(&args);
 930        return err;
 931}
 932
 933static int push(int nr_spec, char **specs)
 934{
 935        struct discovery *heads = discover_refs("git-receive-pack", 1);
 936        int ret;
 937
 938        if (heads->proto_git)
 939                ret = push_git(heads, nr_spec, specs);
 940        else
 941                ret = push_dav(nr_spec, specs);
 942        free_discovery(heads);
 943        return ret;
 944}
 945
 946static void parse_push(struct strbuf *buf)
 947{
 948        char **specs = NULL;
 949        int alloc_spec = 0, nr_spec = 0, i, ret;
 950
 951        do {
 952                if (starts_with(buf->buf, "push ")) {
 953                        ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 954                        specs[nr_spec++] = xstrdup(buf->buf + 5);
 955                }
 956                else
 957                        die("http transport does not support %s", buf->buf);
 958
 959                strbuf_reset(buf);
 960                if (strbuf_getline_lf(buf, stdin) == EOF)
 961                        goto free_specs;
 962                if (!*buf->buf)
 963                        break;
 964        } while (1);
 965
 966        ret = push(nr_spec, specs);
 967        printf("\n");
 968        fflush(stdout);
 969
 970        if (ret)
 971                exit(128); /* error already reported */
 972
 973 free_specs:
 974        for (i = 0; i < nr_spec; i++)
 975                free(specs[i]);
 976        free(specs);
 977}
 978
 979int main(int argc, const char **argv)
 980{
 981        struct strbuf buf = STRBUF_INIT;
 982        int nongit;
 983
 984        git_setup_gettext();
 985
 986        git_extract_argv0_path(argv[0]);
 987        setup_git_directory_gently(&nongit);
 988        if (argc < 2) {
 989                error("remote-curl: usage: git remote-curl <remote> [<url>]");
 990                return 1;
 991        }
 992
 993        options.verbosity = 1;
 994        options.progress = !!isatty(2);
 995        options.thin = 1;
 996        string_list_init(&options.deepen_not, 1);
 997
 998        remote = remote_get(argv[1]);
 999
1000        if (argc > 2) {
1001                end_url_with_slash(&url, argv[2]);
1002        } else {
1003                end_url_with_slash(&url, remote->url[0]);
1004        }
1005
1006        http_init(remote, url.buf, 0);
1007
1008        do {
1009                const char *arg;
1010
1011                if (strbuf_getline_lf(&buf, stdin) == EOF) {
1012                        if (ferror(stdin))
1013                                error("remote-curl: error reading command stream from git");
1014                        return 1;
1015                }
1016                if (buf.len == 0)
1017                        break;
1018                if (starts_with(buf.buf, "fetch ")) {
1019                        if (nongit)
1020                                die("remote-curl: fetch attempted without a local repo");
1021                        parse_fetch(&buf);
1022
1023                } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1024                        int for_push = !!strstr(buf.buf + 4, "for-push");
1025                        output_refs(get_refs(for_push));
1026
1027                } else if (starts_with(buf.buf, "push ")) {
1028                        parse_push(&buf);
1029
1030                } else if (skip_prefix(buf.buf, "option ", &arg)) {
1031                        char *value = strchr(arg, ' ');
1032                        int result;
1033
1034                        if (value)
1035                                *value++ = '\0';
1036                        else
1037                                value = "true";
1038
1039                        result = set_option(arg, value);
1040                        if (!result)
1041                                printf("ok\n");
1042                        else if (result < 0)
1043                                printf("error invalid value\n");
1044                        else
1045                                printf("unsupported\n");
1046                        fflush(stdout);
1047
1048                } else if (!strcmp(buf.buf, "capabilities")) {
1049                        printf("fetch\n");
1050                        printf("option\n");
1051                        printf("push\n");
1052                        printf("check-connectivity\n");
1053                        printf("\n");
1054                        fflush(stdout);
1055                } else {
1056                        error("remote-curl: unknown command '%s' from git", buf.buf);
1057                        return 1;
1058                }
1059                strbuf_reset(&buf);
1060        } while (1);
1061
1062        http_cleanup();
1063
1064        return 0;
1065}