Andrew's git / gitweb.git / remote-curl.c
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remote-curl.con commit Merge branch 'ps/plug-xdl-merge-leak' into maint (4da4026)
   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        unsigned progress : 1,
  24                check_self_contained_and_connected : 1,
  25                cloning : 1,
  26                update_shallow : 1,
  27                followtags : 1,
  28                dry_run : 1,
  29                thin : 1,
  30                /* One of the SEND_PACK_PUSH_CERT_* constants. */
  31                push_cert : 2;
  32};
  33static struct options options;
  34static struct string_list cas_options = STRING_LIST_INIT_DUP;
  35
  36static int set_option(const char *name, const char *value)
  37{
  38        if (!strcmp(name, "verbosity")) {
  39                char *end;
  40                int v = strtol(value, &end, 10);
  41                if (value == end || *end)
  42                        return -1;
  43                options.verbosity = v;
  44                return 0;
  45        }
  46        else if (!strcmp(name, "progress")) {
  47                if (!strcmp(value, "true"))
  48                        options.progress = 1;
  49                else if (!strcmp(value, "false"))
  50                        options.progress = 0;
  51                else
  52                        return -1;
  53                return 0;
  54        }
  55        else if (!strcmp(name, "depth")) {
  56                char *end;
  57                unsigned long v = strtoul(value, &end, 10);
  58                if (value == end || *end)
  59                        return -1;
  60                options.depth = v;
  61                return 0;
  62        }
  63        else if (!strcmp(name, "followtags")) {
  64                if (!strcmp(value, "true"))
  65                        options.followtags = 1;
  66                else if (!strcmp(value, "false"))
  67                        options.followtags = 0;
  68                else
  69                        return -1;
  70                return 0;
  71        }
  72        else if (!strcmp(name, "dry-run")) {
  73                if (!strcmp(value, "true"))
  74                        options.dry_run = 1;
  75                else if (!strcmp(value, "false"))
  76                        options.dry_run = 0;
  77                else
  78                        return -1;
  79                return 0;
  80        }
  81        else if (!strcmp(name, "check-connectivity")) {
  82                if (!strcmp(value, "true"))
  83                        options.check_self_contained_and_connected = 1;
  84                else if (!strcmp(value, "false"))
  85                        options.check_self_contained_and_connected = 0;
  86                else
  87                        return -1;
  88                return 0;
  89        }
  90        else if (!strcmp(name, "cas")) {
  91                struct strbuf val = STRBUF_INIT;
  92                strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
  93                string_list_append(&cas_options, val.buf);
  94                strbuf_release(&val);
  95                return 0;
  96        } else if (!strcmp(name, "cloning")) {
  97                if (!strcmp(value, "true"))
  98                        options.cloning = 1;
  99                else if (!strcmp(value, "false"))
 100                        options.cloning = 0;
 101                else
 102                        return -1;
 103                return 0;
 104        } else if (!strcmp(name, "update-shallow")) {
 105                if (!strcmp(value, "true"))
 106                        options.update_shallow = 1;
 107                else if (!strcmp(value, "false"))
 108                        options.update_shallow = 0;
 109                else
 110                        return -1;
 111                return 0;
 112        } else if (!strcmp(name, "pushcert")) {
 113                if (!strcmp(value, "true"))
 114                        options.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 115                else if (!strcmp(value, "false"))
 116                        options.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 117                else if (!strcmp(value, "if-asked"))
 118                        options.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 119                else
 120                        return -1;
 121                return 0;
 122        } else {
 123                return 1 /* unsupported */;
 124        }
 125}
 126
 127struct discovery {
 128        const char *service;
 129        char *buf_alloc;
 130        char *buf;
 131        size_t len;
 132        struct ref *refs;
 133        struct sha1_array shallow;
 134        unsigned proto_git : 1;
 135};
 136static struct discovery *last_discovery;
 137
 138static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 139{
 140        struct ref *list = NULL;
 141        get_remote_heads(-1, heads->buf, heads->len, &list,
 142                         for_push ? REF_NORMAL : 0, NULL, &heads->shallow);
 143        return list;
 144}
 145
 146static struct ref *parse_info_refs(struct discovery *heads)
 147{
 148        char *data, *start, *mid;
 149        char *ref_name;
 150        int i = 0;
 151
 152        struct ref *refs = NULL;
 153        struct ref *ref = NULL;
 154        struct ref *last_ref = NULL;
 155
 156        data = heads->buf;
 157        start = NULL;
 158        mid = data;
 159        while (i < heads->len) {
 160                if (!start) {
 161                        start = &data[i];
 162                }
 163                if (data[i] == '\t')
 164                        mid = &data[i];
 165                if (data[i] == '\n') {
 166                        if (mid - start != 40)
 167                                die("%sinfo/refs not valid: is this a git repository?",
 168                                    url.buf);
 169                        data[i] = 0;
 170                        ref_name = mid + 1;
 171                        ref = alloc_ref(ref_name);
 172                        get_oid_hex(start, &ref->old_oid);
 173                        if (!refs)
 174                                refs = ref;
 175                        if (last_ref)
 176                                last_ref->next = ref;
 177                        last_ref = ref;
 178                        start = NULL;
 179                }
 180                i++;
 181        }
 182
 183        ref = alloc_ref("HEAD");
 184        if (!http_fetch_ref(url.buf, ref) &&
 185            !resolve_remote_symref(ref, refs)) {
 186                ref->next = refs;
 187                refs = ref;
 188        } else {
 189                free(ref);
 190        }
 191
 192        return refs;
 193}
 194
 195static void free_discovery(struct discovery *d)
 196{
 197        if (d) {
 198                if (d == last_discovery)
 199                        last_discovery = NULL;
 200                free(d->shallow.sha1);
 201                free(d->buf_alloc);
 202                free_refs(d->refs);
 203                free(d);
 204        }
 205}
 206
 207static int show_http_message(struct strbuf *type, struct strbuf *charset,
 208                             struct strbuf *msg)
 209{
 210        const char *p, *eol;
 211
 212        /*
 213         * We only show text/plain parts, as other types are likely
 214         * to be ugly to look at on the user's terminal.
 215         */
 216        if (strcmp(type->buf, "text/plain"))
 217                return -1;
 218        if (charset->len)
 219                strbuf_reencode(msg, charset->buf, get_log_output_encoding());
 220
 221        strbuf_trim(msg);
 222        if (!msg->len)
 223                return -1;
 224
 225        p = msg->buf;
 226        do {
 227                eol = strchrnul(p, '\n');
 228                fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 229                p = eol + 1;
 230        } while(*eol);
 231        return 0;
 232}
 233
 234static struct discovery *discover_refs(const char *service, int for_push)
 235{
 236        struct strbuf exp = STRBUF_INIT;
 237        struct strbuf type = STRBUF_INIT;
 238        struct strbuf charset = STRBUF_INIT;
 239        struct strbuf buffer = STRBUF_INIT;
 240        struct strbuf refs_url = STRBUF_INIT;
 241        struct strbuf effective_url = STRBUF_INIT;
 242        struct discovery *last = last_discovery;
 243        int http_ret, maybe_smart = 0;
 244        struct http_get_options options;
 245
 246        if (last && !strcmp(service, last->service))
 247                return last;
 248        free_discovery(last);
 249
 250        strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 251        if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
 252             git_env_bool("GIT_SMART_HTTP", 1)) {
 253                maybe_smart = 1;
 254                if (!strchr(url.buf, '?'))
 255                        strbuf_addch(&refs_url, '?');
 256                else
 257                        strbuf_addch(&refs_url, '&');
 258                strbuf_addf(&refs_url, "service=%s", service);
 259        }
 260
 261        memset(&options, 0, sizeof(options));
 262        options.content_type = &type;
 263        options.charset = &charset;
 264        options.effective_url = &effective_url;
 265        options.base_url = &url;
 266        options.no_cache = 1;
 267        options.keep_error = 1;
 268
 269        http_ret = http_get_strbuf(refs_url.buf, &buffer, &options);
 270        switch (http_ret) {
 271        case HTTP_OK:
 272                break;
 273        case HTTP_MISSING_TARGET:
 274                show_http_message(&type, &charset, &buffer);
 275                die("repository '%s' not found", url.buf);
 276        case HTTP_NOAUTH:
 277                show_http_message(&type, &charset, &buffer);
 278                die("Authentication failed for '%s'", url.buf);
 279        default:
 280                show_http_message(&type, &charset, &buffer);
 281                die("unable to access '%s': %s", url.buf, curl_errorstr);
 282        }
 283
 284        last= xcalloc(1, sizeof(*last_discovery));
 285        last->service = service;
 286        last->buf_alloc = strbuf_detach(&buffer, &last->len);
 287        last->buf = last->buf_alloc;
 288
 289        strbuf_addf(&exp, "application/x-%s-advertisement", service);
 290        if (maybe_smart &&
 291            (5 <= last->len && last->buf[4] == '#') &&
 292            !strbuf_cmp(&exp, &type)) {
 293                char *line;
 294
 295                /*
 296                 * smart HTTP response; validate that the service
 297                 * pkt-line matches our request.
 298                 */
 299                line = packet_read_line_buf(&last->buf, &last->len, NULL);
 300
 301                strbuf_reset(&exp);
 302                strbuf_addf(&exp, "# service=%s", service);
 303                if (strcmp(line, exp.buf))
 304                        die("invalid server response; got '%s'", line);
 305                strbuf_release(&exp);
 306
 307                /* The header can include additional metadata lines, up
 308                 * until a packet flush marker.  Ignore these now, but
 309                 * in the future we might start to scan them.
 310                 */
 311                while (packet_read_line_buf(&last->buf, &last->len, NULL))
 312                        ;
 313
 314                last->proto_git = 1;
 315        }
 316
 317        if (last->proto_git)
 318                last->refs = parse_git_refs(last, for_push);
 319        else
 320                last->refs = parse_info_refs(last);
 321
 322        strbuf_release(&refs_url);
 323        strbuf_release(&exp);
 324        strbuf_release(&type);
 325        strbuf_release(&charset);
 326        strbuf_release(&effective_url);
 327        strbuf_release(&buffer);
 328        last_discovery = last;
 329        return last;
 330}
 331
 332static struct ref *get_refs(int for_push)
 333{
 334        struct discovery *heads;
 335
 336        if (for_push)
 337                heads = discover_refs("git-receive-pack", for_push);
 338        else
 339                heads = discover_refs("git-upload-pack", for_push);
 340
 341        return heads->refs;
 342}
 343
 344static void output_refs(struct ref *refs)
 345{
 346        struct ref *posn;
 347        for (posn = refs; posn; posn = posn->next) {
 348                if (posn->symref)
 349                        printf("@%s %s\n", posn->symref, posn->name);
 350                else
 351                        printf("%s %s\n", oid_to_hex(&posn->old_oid), posn->name);
 352        }
 353        printf("\n");
 354        fflush(stdout);
 355}
 356
 357struct rpc_state {
 358        const char *service_name;
 359        const char **argv;
 360        struct strbuf *stdin_preamble;
 361        char *service_url;
 362        char *hdr_content_type;
 363        char *hdr_accept;
 364        char *buf;
 365        size_t alloc;
 366        size_t len;
 367        size_t pos;
 368        int in;
 369        int out;
 370        struct strbuf result;
 371        unsigned gzip_request : 1;
 372        unsigned initial_buffer : 1;
 373};
 374
 375static size_t rpc_out(void *ptr, size_t eltsize,
 376                size_t nmemb, void *buffer_)
 377{
 378        size_t max = eltsize * nmemb;
 379        struct rpc_state *rpc = buffer_;
 380        size_t avail = rpc->len - rpc->pos;
 381
 382        if (!avail) {
 383                rpc->initial_buffer = 0;
 384                avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 385                if (!avail)
 386                        return 0;
 387                rpc->pos = 0;
 388                rpc->len = avail;
 389        }
 390
 391        if (max < avail)
 392                avail = max;
 393        memcpy(ptr, rpc->buf + rpc->pos, avail);
 394        rpc->pos += avail;
 395        return avail;
 396}
 397
 398#ifndef NO_CURL_IOCTL
 399static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 400{
 401        struct rpc_state *rpc = clientp;
 402
 403        switch (cmd) {
 404        case CURLIOCMD_NOP:
 405                return CURLIOE_OK;
 406
 407        case CURLIOCMD_RESTARTREAD:
 408                if (rpc->initial_buffer) {
 409                        rpc->pos = 0;
 410                        return CURLIOE_OK;
 411                }
 412                error("unable to rewind rpc post data - try increasing http.postBuffer");
 413                return CURLIOE_FAILRESTART;
 414
 415        default:
 416                return CURLIOE_UNKNOWNCMD;
 417        }
 418}
 419#endif
 420
 421static size_t rpc_in(char *ptr, size_t eltsize,
 422                size_t nmemb, void *buffer_)
 423{
 424        size_t size = eltsize * nmemb;
 425        struct rpc_state *rpc = buffer_;
 426        write_or_die(rpc->in, ptr, size);
 427        return size;
 428}
 429
 430static int run_slot(struct active_request_slot *slot,
 431                    struct slot_results *results)
 432{
 433        int err;
 434        struct slot_results results_buf;
 435
 436        if (!results)
 437                results = &results_buf;
 438
 439        err = run_one_slot(slot, results);
 440
 441        if (err != HTTP_OK && err != HTTP_REAUTH) {
 442                struct strbuf msg = STRBUF_INIT;
 443                if (results->http_code && results->http_code != 200)
 444                        strbuf_addf(&msg, "HTTP %ld", results->http_code);
 445                if (results->curl_result != CURLE_OK) {
 446                        if (msg.len)
 447                                strbuf_addch(&msg, ' ');
 448                        strbuf_addf(&msg, "curl %d", results->curl_result);
 449                        if (curl_errorstr[0]) {
 450                                strbuf_addch(&msg, ' ');
 451                                strbuf_addstr(&msg, curl_errorstr);
 452                        }
 453                }
 454                error("RPC failed; %s", msg.buf);
 455                strbuf_release(&msg);
 456        }
 457
 458        return err;
 459}
 460
 461static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 462{
 463        struct active_request_slot *slot;
 464        struct curl_slist *headers = NULL;
 465        struct strbuf buf = STRBUF_INIT;
 466        int err;
 467
 468        slot = get_active_slot();
 469
 470        headers = curl_slist_append(headers, rpc->hdr_content_type);
 471        headers = curl_slist_append(headers, rpc->hdr_accept);
 472
 473        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 474        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 475        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 476        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 477        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 478        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 479        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 480        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 481        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 482
 483        err = run_slot(slot, results);
 484
 485        curl_slist_free_all(headers);
 486        strbuf_release(&buf);
 487        return err;
 488}
 489
 490static int post_rpc(struct rpc_state *rpc)
 491{
 492        struct active_request_slot *slot;
 493        struct curl_slist *headers = NULL;
 494        int use_gzip = rpc->gzip_request;
 495        char *gzip_body = NULL;
 496        size_t gzip_size = 0;
 497        int err, large_request = 0;
 498        int needs_100_continue = 0;
 499
 500        /* Try to load the entire request, if we can fit it into the
 501         * allocated buffer space we can use HTTP/1.0 and avoid the
 502         * chunked encoding mess.
 503         */
 504        while (1) {
 505                size_t left = rpc->alloc - rpc->len;
 506                char *buf = rpc->buf + rpc->len;
 507                int n;
 508
 509                if (left < LARGE_PACKET_MAX) {
 510                        large_request = 1;
 511                        use_gzip = 0;
 512                        break;
 513                }
 514
 515                n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 516                if (!n)
 517                        break;
 518                rpc->len += n;
 519        }
 520
 521        if (large_request) {
 522                struct slot_results results;
 523
 524                do {
 525                        err = probe_rpc(rpc, &results);
 526                        if (err == HTTP_REAUTH)
 527                                credential_fill(&http_auth);
 528                } while (err == HTTP_REAUTH);
 529                if (err != HTTP_OK)
 530                        return -1;
 531
 532                if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 533                        needs_100_continue = 1;
 534        }
 535
 536        headers = curl_slist_append(headers, rpc->hdr_content_type);
 537        headers = curl_slist_append(headers, rpc->hdr_accept);
 538        headers = curl_slist_append(headers, needs_100_continue ?
 539                "Expect: 100-continue" : "Expect:");
 540
 541retry:
 542        slot = get_active_slot();
 543
 544        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 545        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 546        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 547        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 548
 549        if (large_request) {
 550                /* The request body is large and the size cannot be predicted.
 551                 * We must use chunked encoding to send it.
 552                 */
 553                headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 554                rpc->initial_buffer = 1;
 555                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 556                curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 557#ifndef NO_CURL_IOCTL
 558                curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 559                curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 560#endif
 561                if (options.verbosity > 1) {
 562                        fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 563                        fflush(stderr);
 564                }
 565
 566        } else if (gzip_body) {
 567                /*
 568                 * If we are looping to retry authentication, then the previous
 569                 * run will have set up the headers and gzip buffer already,
 570                 * and we just need to send it.
 571                 */
 572                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 573                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 574
 575        } else if (use_gzip && 1024 < rpc->len) {
 576                /* The client backend isn't giving us compressed data so
 577                 * we can try to deflate it ourselves, this may save on.
 578                 * the transfer time.
 579                 */
 580                git_zstream stream;
 581                int ret;
 582
 583                git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 584                gzip_size = git_deflate_bound(&stream, rpc->len);
 585                gzip_body = xmalloc(gzip_size);
 586
 587                stream.next_in = (unsigned char *)rpc->buf;
 588                stream.avail_in = rpc->len;
 589                stream.next_out = (unsigned char *)gzip_body;
 590                stream.avail_out = gzip_size;
 591
 592                ret = git_deflate(&stream, Z_FINISH);
 593                if (ret != Z_STREAM_END)
 594                        die("cannot deflate request; zlib deflate error %d", ret);
 595
 596                ret = git_deflate_end_gently(&stream);
 597                if (ret != Z_OK)
 598                        die("cannot deflate request; zlib end error %d", ret);
 599
 600                gzip_size = stream.total_out;
 601
 602                headers = curl_slist_append(headers, "Content-Encoding: gzip");
 603                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 604                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 605
 606                if (options.verbosity > 1) {
 607                        fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 608                                rpc->service_name,
 609                                (unsigned long)rpc->len, (unsigned long)gzip_size);
 610                        fflush(stderr);
 611                }
 612        } else {
 613                /* We know the complete request size in advance, use the
 614                 * more normal Content-Length approach.
 615                 */
 616                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 617                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 618                if (options.verbosity > 1) {
 619                        fprintf(stderr, "POST %s (%lu bytes)\n",
 620                                rpc->service_name, (unsigned long)rpc->len);
 621                        fflush(stderr);
 622                }
 623        }
 624
 625        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 626        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 627        curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 628
 629        err = run_slot(slot, NULL);
 630        if (err == HTTP_REAUTH && !large_request) {
 631                credential_fill(&http_auth);
 632                goto retry;
 633        }
 634        if (err != HTTP_OK)
 635                err = -1;
 636
 637        curl_slist_free_all(headers);
 638        free(gzip_body);
 639        return err;
 640}
 641
 642static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 643{
 644        const char *svc = rpc->service_name;
 645        struct strbuf buf = STRBUF_INIT;
 646        struct strbuf *preamble = rpc->stdin_preamble;
 647        struct child_process client = CHILD_PROCESS_INIT;
 648        int err = 0;
 649
 650        client.in = -1;
 651        client.out = -1;
 652        client.git_cmd = 1;
 653        client.argv = rpc->argv;
 654        if (start_command(&client))
 655                exit(1);
 656        if (preamble)
 657                write_or_die(client.in, preamble->buf, preamble->len);
 658        if (heads)
 659                write_or_die(client.in, heads->buf, heads->len);
 660
 661        rpc->alloc = http_post_buffer;
 662        rpc->buf = xmalloc(rpc->alloc);
 663        rpc->in = client.in;
 664        rpc->out = client.out;
 665        strbuf_init(&rpc->result, 0);
 666
 667        strbuf_addf(&buf, "%s%s", url.buf, svc);
 668        rpc->service_url = strbuf_detach(&buf, NULL);
 669
 670        strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 671        rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 672
 673        strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 674        rpc->hdr_accept = strbuf_detach(&buf, NULL);
 675
 676        while (!err) {
 677                int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 678                if (!n)
 679                        break;
 680                rpc->pos = 0;
 681                rpc->len = n;
 682                err |= post_rpc(rpc);
 683        }
 684
 685        close(client.in);
 686        client.in = -1;
 687        if (!err) {
 688                strbuf_read(&rpc->result, client.out, 0);
 689        } else {
 690                char buf[4096];
 691                for (;;)
 692                        if (xread(client.out, buf, sizeof(buf)) <= 0)
 693                                break;
 694        }
 695
 696        close(client.out);
 697        client.out = -1;
 698
 699        err |= finish_command(&client);
 700        free(rpc->service_url);
 701        free(rpc->hdr_content_type);
 702        free(rpc->hdr_accept);
 703        free(rpc->buf);
 704        strbuf_release(&buf);
 705        return err;
 706}
 707
 708static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 709{
 710        struct walker *walker;
 711        char **targets;
 712        int ret, i;
 713
 714        ALLOC_ARRAY(targets, nr_heads);
 715        if (options.depth)
 716                die("dumb http transport does not support --depth");
 717        for (i = 0; i < nr_heads; i++)
 718                targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
 719
 720        walker = get_http_walker(url.buf);
 721        walker->get_all = 1;
 722        walker->get_tree = 1;
 723        walker->get_history = 1;
 724        walker->get_verbosely = options.verbosity >= 3;
 725        walker->get_recover = 0;
 726        ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 727        walker_free(walker);
 728
 729        for (i = 0; i < nr_heads; i++)
 730                free(targets[i]);
 731        free(targets);
 732
 733        return ret ? error("fetch failed.") : 0;
 734}
 735
 736static int fetch_git(struct discovery *heads,
 737        int nr_heads, struct ref **to_fetch)
 738{
 739        struct rpc_state rpc;
 740        struct strbuf preamble = STRBUF_INIT;
 741        char *depth_arg = NULL;
 742        int argc = 0, i, err;
 743        const char *argv[17];
 744
 745        argv[argc++] = "fetch-pack";
 746        argv[argc++] = "--stateless-rpc";
 747        argv[argc++] = "--stdin";
 748        argv[argc++] = "--lock-pack";
 749        if (options.followtags)
 750                argv[argc++] = "--include-tag";
 751        if (options.thin)
 752                argv[argc++] = "--thin";
 753        if (options.verbosity >= 3) {
 754                argv[argc++] = "-v";
 755                argv[argc++] = "-v";
 756        }
 757        if (options.check_self_contained_and_connected)
 758                argv[argc++] = "--check-self-contained-and-connected";
 759        if (options.cloning)
 760                argv[argc++] = "--cloning";
 761        if (options.update_shallow)
 762                argv[argc++] = "--update-shallow";
 763        if (!options.progress)
 764                argv[argc++] = "--no-progress";
 765        if (options.depth) {
 766                struct strbuf buf = STRBUF_INIT;
 767                strbuf_addf(&buf, "--depth=%lu", options.depth);
 768                depth_arg = strbuf_detach(&buf, NULL);
 769                argv[argc++] = depth_arg;
 770        }
 771        argv[argc++] = url.buf;
 772        argv[argc++] = NULL;
 773
 774        for (i = 0; i < nr_heads; i++) {
 775                struct ref *ref = to_fetch[i];
 776                if (!*ref->name)
 777                        die("cannot fetch by sha1 over smart http");
 778                packet_buf_write(&preamble, "%s %s\n",
 779                                 oid_to_hex(&ref->old_oid), ref->name);
 780        }
 781        packet_buf_flush(&preamble);
 782
 783        memset(&rpc, 0, sizeof(rpc));
 784        rpc.service_name = "git-upload-pack",
 785        rpc.argv = argv;
 786        rpc.stdin_preamble = &preamble;
 787        rpc.gzip_request = 1;
 788
 789        err = rpc_service(&rpc, heads);
 790        if (rpc.result.len)
 791                write_or_die(1, rpc.result.buf, rpc.result.len);
 792        strbuf_release(&rpc.result);
 793        strbuf_release(&preamble);
 794        free(depth_arg);
 795        return err;
 796}
 797
 798static int fetch(int nr_heads, struct ref **to_fetch)
 799{
 800        struct discovery *d = discover_refs("git-upload-pack", 0);
 801        if (d->proto_git)
 802                return fetch_git(d, nr_heads, to_fetch);
 803        else
 804                return fetch_dumb(nr_heads, to_fetch);
 805}
 806
 807static void parse_fetch(struct strbuf *buf)
 808{
 809        struct ref **to_fetch = NULL;
 810        struct ref *list_head = NULL;
 811        struct ref **list = &list_head;
 812        int alloc_heads = 0, nr_heads = 0;
 813
 814        do {
 815                const char *p;
 816                if (skip_prefix(buf->buf, "fetch ", &p)) {
 817                        const char *name;
 818                        struct ref *ref;
 819                        struct object_id old_oid;
 820
 821                        if (get_oid_hex(p, &old_oid))
 822                                die("protocol error: expected sha/ref, got %s'", p);
 823                        if (p[GIT_SHA1_HEXSZ] == ' ')
 824                                name = p + GIT_SHA1_HEXSZ + 1;
 825                        else if (!p[GIT_SHA1_HEXSZ])
 826                                name = "";
 827                        else
 828                                die("protocol error: expected sha/ref, got %s'", p);
 829
 830                        ref = alloc_ref(name);
 831                        oidcpy(&ref->old_oid, &old_oid);
 832
 833                        *list = ref;
 834                        list = &ref->next;
 835
 836                        ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 837                        to_fetch[nr_heads++] = ref;
 838                }
 839                else
 840                        die("http transport does not support %s", buf->buf);
 841
 842                strbuf_reset(buf);
 843                if (strbuf_getline(buf, stdin, '\n') == EOF)
 844                        return;
 845                if (!*buf->buf)
 846                        break;
 847        } while (1);
 848
 849        if (fetch(nr_heads, to_fetch))
 850                exit(128); /* error already reported */
 851        free_refs(list_head);
 852        free(to_fetch);
 853
 854        printf("\n");
 855        fflush(stdout);
 856        strbuf_reset(buf);
 857}
 858
 859static int push_dav(int nr_spec, char **specs)
 860{
 861        struct child_process child = CHILD_PROCESS_INIT;
 862        size_t i;
 863
 864        child.git_cmd = 1;
 865        argv_array_push(&child.args, "http-push");
 866        argv_array_push(&child.args, "--helper-status");
 867        if (options.dry_run)
 868                argv_array_push(&child.args, "--dry-run");
 869        if (options.verbosity > 1)
 870                argv_array_push(&child.args, "--verbose");
 871        argv_array_push(&child.args, url.buf);
 872        for (i = 0; i < nr_spec; i++)
 873                argv_array_push(&child.args, specs[i]);
 874
 875        if (run_command(&child))
 876                die("git-http-push failed");
 877        return 0;
 878}
 879
 880static int push_git(struct discovery *heads, int nr_spec, char **specs)
 881{
 882        struct rpc_state rpc;
 883        int i, err;
 884        struct argv_array args;
 885        struct string_list_item *cas_option;
 886        struct strbuf preamble = STRBUF_INIT;
 887
 888        argv_array_init(&args);
 889        argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
 890                         NULL);
 891
 892        if (options.thin)
 893                argv_array_push(&args, "--thin");
 894        if (options.dry_run)
 895                argv_array_push(&args, "--dry-run");
 896        if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
 897                argv_array_push(&args, "--signed=yes");
 898        else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
 899                argv_array_push(&args, "--signed=if-asked");
 900        if (options.verbosity == 0)
 901                argv_array_push(&args, "--quiet");
 902        else if (options.verbosity > 1)
 903                argv_array_push(&args, "--verbose");
 904        argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
 905        for_each_string_list_item(cas_option, &cas_options)
 906                argv_array_push(&args, cas_option->string);
 907        argv_array_push(&args, url.buf);
 908
 909        argv_array_push(&args, "--stdin");
 910        for (i = 0; i < nr_spec; i++)
 911                packet_buf_write(&preamble, "%s\n", specs[i]);
 912        packet_buf_flush(&preamble);
 913
 914        memset(&rpc, 0, sizeof(rpc));
 915        rpc.service_name = "git-receive-pack",
 916        rpc.argv = args.argv;
 917        rpc.stdin_preamble = &preamble;
 918
 919        err = rpc_service(&rpc, heads);
 920        if (rpc.result.len)
 921                write_or_die(1, rpc.result.buf, rpc.result.len);
 922        strbuf_release(&rpc.result);
 923        strbuf_release(&preamble);
 924        argv_array_clear(&args);
 925        return err;
 926}
 927
 928static int push(int nr_spec, char **specs)
 929{
 930        struct discovery *heads = discover_refs("git-receive-pack", 1);
 931        int ret;
 932
 933        if (heads->proto_git)
 934                ret = push_git(heads, nr_spec, specs);
 935        else
 936                ret = push_dav(nr_spec, specs);
 937        free_discovery(heads);
 938        return ret;
 939}
 940
 941static void parse_push(struct strbuf *buf)
 942{
 943        char **specs = NULL;
 944        int alloc_spec = 0, nr_spec = 0, i, ret;
 945
 946        do {
 947                if (starts_with(buf->buf, "push ")) {
 948                        ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 949                        specs[nr_spec++] = xstrdup(buf->buf + 5);
 950                }
 951                else
 952                        die("http transport does not support %s", buf->buf);
 953
 954                strbuf_reset(buf);
 955                if (strbuf_getline(buf, stdin, '\n') == EOF)
 956                        goto free_specs;
 957                if (!*buf->buf)
 958                        break;
 959        } while (1);
 960
 961        ret = push(nr_spec, specs);
 962        printf("\n");
 963        fflush(stdout);
 964
 965        if (ret)
 966                exit(128); /* error already reported */
 967
 968 free_specs:
 969        for (i = 0; i < nr_spec; i++)
 970                free(specs[i]);
 971        free(specs);
 972}
 973
 974int main(int argc, const char **argv)
 975{
 976        struct strbuf buf = STRBUF_INIT;
 977        int nongit;
 978
 979        git_setup_gettext();
 980
 981        git_extract_argv0_path(argv[0]);
 982        setup_git_directory_gently(&nongit);
 983        if (argc < 2) {
 984                error("remote-curl: usage: git remote-curl <remote> [<url>]");
 985                return 1;
 986        }
 987
 988        options.verbosity = 1;
 989        options.progress = !!isatty(2);
 990        options.thin = 1;
 991
 992        remote = remote_get(argv[1]);
 993
 994        if (argc > 2) {
 995                end_url_with_slash(&url, argv[2]);
 996        } else {
 997                end_url_with_slash(&url, remote->url[0]);
 998        }
 999
1000        http_init(remote, url.buf, 0);
1001
1002        do {
1003                const char *arg;
1004
1005                if (strbuf_getline(&buf, stdin, '\n') == EOF) {
1006                        if (ferror(stdin))
1007                                error("remote-curl: error reading command stream from git");
1008                        return 1;
1009                }
1010                if (buf.len == 0)
1011                        break;
1012                if (starts_with(buf.buf, "fetch ")) {
1013                        if (nongit)
1014                                die("remote-curl: fetch attempted without a local repo");
1015                        parse_fetch(&buf);
1016
1017                } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1018                        int for_push = !!strstr(buf.buf + 4, "for-push");
1019                        output_refs(get_refs(for_push));
1020
1021                } else if (starts_with(buf.buf, "push ")) {
1022                        parse_push(&buf);
1023
1024                } else if (skip_prefix(buf.buf, "option ", &arg)) {
1025                        char *value = strchr(arg, ' ');
1026                        int result;
1027
1028                        if (value)
1029                                *value++ = '\0';
1030                        else
1031                                value = "true";
1032
1033                        result = set_option(arg, value);
1034                        if (!result)
1035                                printf("ok\n");
1036                        else if (result < 0)
1037                                printf("error invalid value\n");
1038                        else
1039                                printf("unsupported\n");
1040                        fflush(stdout);
1041
1042                } else if (!strcmp(buf.buf, "capabilities")) {
1043                        printf("fetch\n");
1044                        printf("option\n");
1045                        printf("push\n");
1046                        printf("check-connectivity\n");
1047                        printf("\n");
1048                        fflush(stdout);
1049                } else {
1050                        error("remote-curl: unknown command '%s' from git", buf.buf);
1051                        return 1;
1052                }
1053                strbuf_reset(&buf);
1054        } while (1);
1055
1056        http_cleanup();
1057
1058        return 0;
1059}