Andrew's git / gitweb.git / remote-curl.c
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remote-curl.con commit ref-filter: move get_head_description() from branch.c (d4919bb)
   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
 143#if LIBCURL_VERSION_NUM >= 0x070a08
 144        } else if (!strcmp(name, "family")) {
 145                if (!strcmp(value, "ipv4"))
 146                        git_curl_ipresolve = CURL_IPRESOLVE_V4;
 147                else if (!strcmp(value, "ipv6"))
 148                        git_curl_ipresolve = CURL_IPRESOLVE_V6;
 149                else if (!strcmp(value, "all"))
 150                        git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
 151                else
 152                        return -1;
 153                return 0;
 154#endif /* LIBCURL_VERSION_NUM >= 0x070a08 */
 155        } else {
 156                return 1 /* unsupported */;
 157        }
 158}
 159
 160struct discovery {
 161        const char *service;
 162        char *buf_alloc;
 163        char *buf;
 164        size_t len;
 165        struct ref *refs;
 166        struct sha1_array shallow;
 167        unsigned proto_git : 1;
 168};
 169static struct discovery *last_discovery;
 170
 171static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 172{
 173        struct ref *list = NULL;
 174        get_remote_heads(-1, heads->buf, heads->len, &list,
 175                         for_push ? REF_NORMAL : 0, NULL, &heads->shallow);
 176        return list;
 177}
 178
 179static struct ref *parse_info_refs(struct discovery *heads)
 180{
 181        char *data, *start, *mid;
 182        char *ref_name;
 183        int i = 0;
 184
 185        struct ref *refs = NULL;
 186        struct ref *ref = NULL;
 187        struct ref *last_ref = NULL;
 188
 189        data = heads->buf;
 190        start = NULL;
 191        mid = data;
 192        while (i < heads->len) {
 193                if (!start) {
 194                        start = &data[i];
 195                }
 196                if (data[i] == '\t')
 197                        mid = &data[i];
 198                if (data[i] == '\n') {
 199                        if (mid - start != 40)
 200                                die("%sinfo/refs not valid: is this a git repository?",
 201                                    url.buf);
 202                        data[i] = 0;
 203                        ref_name = mid + 1;
 204                        ref = alloc_ref(ref_name);
 205                        get_oid_hex(start, &ref->old_oid);
 206                        if (!refs)
 207                                refs = ref;
 208                        if (last_ref)
 209                                last_ref->next = ref;
 210                        last_ref = ref;
 211                        start = NULL;
 212                }
 213                i++;
 214        }
 215
 216        ref = alloc_ref("HEAD");
 217        if (!http_fetch_ref(url.buf, ref) &&
 218            !resolve_remote_symref(ref, refs)) {
 219                ref->next = refs;
 220                refs = ref;
 221        } else {
 222                free(ref);
 223        }
 224
 225        return refs;
 226}
 227
 228static void free_discovery(struct discovery *d)
 229{
 230        if (d) {
 231                if (d == last_discovery)
 232                        last_discovery = NULL;
 233                free(d->shallow.sha1);
 234                free(d->buf_alloc);
 235                free_refs(d->refs);
 236                free(d);
 237        }
 238}
 239
 240static int show_http_message(struct strbuf *type, struct strbuf *charset,
 241                             struct strbuf *msg)
 242{
 243        const char *p, *eol;
 244
 245        /*
 246         * We only show text/plain parts, as other types are likely
 247         * to be ugly to look at on the user's terminal.
 248         */
 249        if (strcmp(type->buf, "text/plain"))
 250                return -1;
 251        if (charset->len)
 252                strbuf_reencode(msg, charset->buf, get_log_output_encoding());
 253
 254        strbuf_trim(msg);
 255        if (!msg->len)
 256                return -1;
 257
 258        p = msg->buf;
 259        do {
 260                eol = strchrnul(p, '\n');
 261                fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 262                p = eol + 1;
 263        } while(*eol);
 264        return 0;
 265}
 266
 267static struct discovery *discover_refs(const char *service, int for_push)
 268{
 269        struct strbuf exp = STRBUF_INIT;
 270        struct strbuf type = STRBUF_INIT;
 271        struct strbuf charset = STRBUF_INIT;
 272        struct strbuf buffer = STRBUF_INIT;
 273        struct strbuf refs_url = STRBUF_INIT;
 274        struct strbuf effective_url = STRBUF_INIT;
 275        struct discovery *last = last_discovery;
 276        int http_ret, maybe_smart = 0;
 277        struct http_get_options http_options;
 278
 279        if (last && !strcmp(service, last->service))
 280                return last;
 281        free_discovery(last);
 282
 283        strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 284        if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
 285             git_env_bool("GIT_SMART_HTTP", 1)) {
 286                maybe_smart = 1;
 287                if (!strchr(url.buf, '?'))
 288                        strbuf_addch(&refs_url, '?');
 289                else
 290                        strbuf_addch(&refs_url, '&');
 291                strbuf_addf(&refs_url, "service=%s", service);
 292        }
 293
 294        memset(&http_options, 0, sizeof(http_options));
 295        http_options.content_type = &type;
 296        http_options.charset = &charset;
 297        http_options.effective_url = &effective_url;
 298        http_options.base_url = &url;
 299        http_options.initial_request = 1;
 300        http_options.no_cache = 1;
 301        http_options.keep_error = 1;
 302
 303        http_ret = http_get_strbuf(refs_url.buf, &buffer, &http_options);
 304        switch (http_ret) {
 305        case HTTP_OK:
 306                break;
 307        case HTTP_MISSING_TARGET:
 308                show_http_message(&type, &charset, &buffer);
 309                die("repository '%s' not found", url.buf);
 310        case HTTP_NOAUTH:
 311                show_http_message(&type, &charset, &buffer);
 312                die("Authentication failed for '%s'", url.buf);
 313        default:
 314                show_http_message(&type, &charset, &buffer);
 315                die("unable to access '%s': %s", url.buf, curl_errorstr);
 316        }
 317
 318        if (options.verbosity && !starts_with(refs_url.buf, url.buf))
 319                warning(_("redirecting to %s"), url.buf);
 320
 321        last= xcalloc(1, sizeof(*last_discovery));
 322        last->service = service;
 323        last->buf_alloc = strbuf_detach(&buffer, &last->len);
 324        last->buf = last->buf_alloc;
 325
 326        strbuf_addf(&exp, "application/x-%s-advertisement", service);
 327        if (maybe_smart &&
 328            (5 <= last->len && last->buf[4] == '#') &&
 329            !strbuf_cmp(&exp, &type)) {
 330                char *line;
 331
 332                /*
 333                 * smart HTTP response; validate that the service
 334                 * pkt-line matches our request.
 335                 */
 336                line = packet_read_line_buf(&last->buf, &last->len, NULL);
 337
 338                strbuf_reset(&exp);
 339                strbuf_addf(&exp, "# service=%s", service);
 340                if (strcmp(line, exp.buf))
 341                        die("invalid server response; got '%s'", line);
 342                strbuf_release(&exp);
 343
 344                /* The header can include additional metadata lines, up
 345                 * until a packet flush marker.  Ignore these now, but
 346                 * in the future we might start to scan them.
 347                 */
 348                while (packet_read_line_buf(&last->buf, &last->len, NULL))
 349                        ;
 350
 351                last->proto_git = 1;
 352        }
 353
 354        if (last->proto_git)
 355                last->refs = parse_git_refs(last, for_push);
 356        else
 357                last->refs = parse_info_refs(last);
 358
 359        strbuf_release(&refs_url);
 360        strbuf_release(&exp);
 361        strbuf_release(&type);
 362        strbuf_release(&charset);
 363        strbuf_release(&effective_url);
 364        strbuf_release(&buffer);
 365        last_discovery = last;
 366        return last;
 367}
 368
 369static struct ref *get_refs(int for_push)
 370{
 371        struct discovery *heads;
 372
 373        if (for_push)
 374                heads = discover_refs("git-receive-pack", for_push);
 375        else
 376                heads = discover_refs("git-upload-pack", for_push);
 377
 378        return heads->refs;
 379}
 380
 381static void output_refs(struct ref *refs)
 382{
 383        struct ref *posn;
 384        for (posn = refs; posn; posn = posn->next) {
 385                if (posn->symref)
 386                        printf("@%s %s\n", posn->symref, posn->name);
 387                else
 388                        printf("%s %s\n", oid_to_hex(&posn->old_oid), posn->name);
 389        }
 390        printf("\n");
 391        fflush(stdout);
 392}
 393
 394struct rpc_state {
 395        const char *service_name;
 396        const char **argv;
 397        struct strbuf *stdin_preamble;
 398        char *service_url;
 399        char *hdr_content_type;
 400        char *hdr_accept;
 401        char *buf;
 402        size_t alloc;
 403        size_t len;
 404        size_t pos;
 405        int in;
 406        int out;
 407        struct strbuf result;
 408        unsigned gzip_request : 1;
 409        unsigned initial_buffer : 1;
 410};
 411
 412static size_t rpc_out(void *ptr, size_t eltsize,
 413                size_t nmemb, void *buffer_)
 414{
 415        size_t max = eltsize * nmemb;
 416        struct rpc_state *rpc = buffer_;
 417        size_t avail = rpc->len - rpc->pos;
 418
 419        if (!avail) {
 420                rpc->initial_buffer = 0;
 421                avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 422                if (!avail)
 423                        return 0;
 424                rpc->pos = 0;
 425                rpc->len = avail;
 426        }
 427
 428        if (max < avail)
 429                avail = max;
 430        memcpy(ptr, rpc->buf + rpc->pos, avail);
 431        rpc->pos += avail;
 432        return avail;
 433}
 434
 435#ifndef NO_CURL_IOCTL
 436static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 437{
 438        struct rpc_state *rpc = clientp;
 439
 440        switch (cmd) {
 441        case CURLIOCMD_NOP:
 442                return CURLIOE_OK;
 443
 444        case CURLIOCMD_RESTARTREAD:
 445                if (rpc->initial_buffer) {
 446                        rpc->pos = 0;
 447                        return CURLIOE_OK;
 448                }
 449                error("unable to rewind rpc post data - try increasing http.postBuffer");
 450                return CURLIOE_FAILRESTART;
 451
 452        default:
 453                return CURLIOE_UNKNOWNCMD;
 454        }
 455}
 456#endif
 457
 458static size_t rpc_in(char *ptr, size_t eltsize,
 459                size_t nmemb, void *buffer_)
 460{
 461        size_t size = eltsize * nmemb;
 462        struct rpc_state *rpc = buffer_;
 463        write_or_die(rpc->in, ptr, size);
 464        return size;
 465}
 466
 467static int run_slot(struct active_request_slot *slot,
 468                    struct slot_results *results)
 469{
 470        int err;
 471        struct slot_results results_buf;
 472
 473        if (!results)
 474                results = &results_buf;
 475
 476        err = run_one_slot(slot, results);
 477
 478        if (err != HTTP_OK && err != HTTP_REAUTH) {
 479                struct strbuf msg = STRBUF_INIT;
 480                if (results->http_code && results->http_code != 200)
 481                        strbuf_addf(&msg, "HTTP %ld", results->http_code);
 482                if (results->curl_result != CURLE_OK) {
 483                        if (msg.len)
 484                                strbuf_addch(&msg, ' ');
 485                        strbuf_addf(&msg, "curl %d", results->curl_result);
 486                        if (curl_errorstr[0]) {
 487                                strbuf_addch(&msg, ' ');
 488                                strbuf_addstr(&msg, curl_errorstr);
 489                        }
 490                }
 491                error("RPC failed; %s", msg.buf);
 492                strbuf_release(&msg);
 493        }
 494
 495        return err;
 496}
 497
 498static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 499{
 500        struct active_request_slot *slot;
 501        struct curl_slist *headers = http_copy_default_headers();
 502        struct strbuf buf = STRBUF_INIT;
 503        int err;
 504
 505        slot = get_active_slot();
 506
 507        headers = curl_slist_append(headers, rpc->hdr_content_type);
 508        headers = curl_slist_append(headers, rpc->hdr_accept);
 509
 510        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 511        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 512        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 513        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 514        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 515        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 516        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 517        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 518        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 519
 520        err = run_slot(slot, results);
 521
 522        curl_slist_free_all(headers);
 523        strbuf_release(&buf);
 524        return err;
 525}
 526
 527static int post_rpc(struct rpc_state *rpc)
 528{
 529        struct active_request_slot *slot;
 530        struct curl_slist *headers = http_copy_default_headers();
 531        int use_gzip = rpc->gzip_request;
 532        char *gzip_body = NULL;
 533        size_t gzip_size = 0;
 534        int err, large_request = 0;
 535        int needs_100_continue = 0;
 536
 537        /* Try to load the entire request, if we can fit it into the
 538         * allocated buffer space we can use HTTP/1.0 and avoid the
 539         * chunked encoding mess.
 540         */
 541        while (1) {
 542                size_t left = rpc->alloc - rpc->len;
 543                char *buf = rpc->buf + rpc->len;
 544                int n;
 545
 546                if (left < LARGE_PACKET_MAX) {
 547                        large_request = 1;
 548                        use_gzip = 0;
 549                        break;
 550                }
 551
 552                n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 553                if (!n)
 554                        break;
 555                rpc->len += n;
 556        }
 557
 558        if (large_request) {
 559                struct slot_results results;
 560
 561                do {
 562                        err = probe_rpc(rpc, &results);
 563                        if (err == HTTP_REAUTH)
 564                                credential_fill(&http_auth);
 565                } while (err == HTTP_REAUTH);
 566                if (err != HTTP_OK)
 567                        return -1;
 568
 569                if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 570                        needs_100_continue = 1;
 571        }
 572
 573        headers = curl_slist_append(headers, rpc->hdr_content_type);
 574        headers = curl_slist_append(headers, rpc->hdr_accept);
 575        headers = curl_slist_append(headers, needs_100_continue ?
 576                "Expect: 100-continue" : "Expect:");
 577
 578retry:
 579        slot = get_active_slot();
 580
 581        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 582        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 583        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 584        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 585
 586        if (large_request) {
 587                /* The request body is large and the size cannot be predicted.
 588                 * We must use chunked encoding to send it.
 589                 */
 590                headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 591                rpc->initial_buffer = 1;
 592                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 593                curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 594#ifndef NO_CURL_IOCTL
 595                curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 596                curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 597#endif
 598                if (options.verbosity > 1) {
 599                        fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 600                        fflush(stderr);
 601                }
 602
 603        } else if (gzip_body) {
 604                /*
 605                 * If we are looping to retry authentication, then the previous
 606                 * run will have set up the headers and gzip buffer already,
 607                 * and we just need to send it.
 608                 */
 609                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 610                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 611
 612        } else if (use_gzip && 1024 < rpc->len) {
 613                /* The client backend isn't giving us compressed data so
 614                 * we can try to deflate it ourselves, this may save on.
 615                 * the transfer time.
 616                 */
 617                git_zstream stream;
 618                int ret;
 619
 620                git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 621                gzip_size = git_deflate_bound(&stream, rpc->len);
 622                gzip_body = xmalloc(gzip_size);
 623
 624                stream.next_in = (unsigned char *)rpc->buf;
 625                stream.avail_in = rpc->len;
 626                stream.next_out = (unsigned char *)gzip_body;
 627                stream.avail_out = gzip_size;
 628
 629                ret = git_deflate(&stream, Z_FINISH);
 630                if (ret != Z_STREAM_END)
 631                        die("cannot deflate request; zlib deflate error %d", ret);
 632
 633                ret = git_deflate_end_gently(&stream);
 634                if (ret != Z_OK)
 635                        die("cannot deflate request; zlib end error %d", ret);
 636
 637                gzip_size = stream.total_out;
 638
 639                headers = curl_slist_append(headers, "Content-Encoding: gzip");
 640                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 641                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 642
 643                if (options.verbosity > 1) {
 644                        fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 645                                rpc->service_name,
 646                                (unsigned long)rpc->len, (unsigned long)gzip_size);
 647                        fflush(stderr);
 648                }
 649        } else {
 650                /* We know the complete request size in advance, use the
 651                 * more normal Content-Length approach.
 652                 */
 653                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 654                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 655                if (options.verbosity > 1) {
 656                        fprintf(stderr, "POST %s (%lu bytes)\n",
 657                                rpc->service_name, (unsigned long)rpc->len);
 658                        fflush(stderr);
 659                }
 660        }
 661
 662        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 663        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 664        curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 665
 666        err = run_slot(slot, NULL);
 667        if (err == HTTP_REAUTH && !large_request) {
 668                credential_fill(&http_auth);
 669                goto retry;
 670        }
 671        if (err != HTTP_OK)
 672                err = -1;
 673
 674        curl_slist_free_all(headers);
 675        free(gzip_body);
 676        return err;
 677}
 678
 679static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 680{
 681        const char *svc = rpc->service_name;
 682        struct strbuf buf = STRBUF_INIT;
 683        struct strbuf *preamble = rpc->stdin_preamble;
 684        struct child_process client = CHILD_PROCESS_INIT;
 685        int err = 0;
 686
 687        client.in = -1;
 688        client.out = -1;
 689        client.git_cmd = 1;
 690        client.argv = rpc->argv;
 691        if (start_command(&client))
 692                exit(1);
 693        if (preamble)
 694                write_or_die(client.in, preamble->buf, preamble->len);
 695        if (heads)
 696                write_or_die(client.in, heads->buf, heads->len);
 697
 698        rpc->alloc = http_post_buffer;
 699        rpc->buf = xmalloc(rpc->alloc);
 700        rpc->in = client.in;
 701        rpc->out = client.out;
 702        strbuf_init(&rpc->result, 0);
 703
 704        strbuf_addf(&buf, "%s%s", url.buf, svc);
 705        rpc->service_url = strbuf_detach(&buf, NULL);
 706
 707        strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 708        rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 709
 710        strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 711        rpc->hdr_accept = strbuf_detach(&buf, NULL);
 712
 713        while (!err) {
 714                int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 715                if (!n)
 716                        break;
 717                rpc->pos = 0;
 718                rpc->len = n;
 719                err |= post_rpc(rpc);
 720        }
 721
 722        close(client.in);
 723        client.in = -1;
 724        if (!err) {
 725                strbuf_read(&rpc->result, client.out, 0);
 726        } else {
 727                char buf[4096];
 728                for (;;)
 729                        if (xread(client.out, buf, sizeof(buf)) <= 0)
 730                                break;
 731        }
 732
 733        close(client.out);
 734        client.out = -1;
 735
 736        err |= finish_command(&client);
 737        free(rpc->service_url);
 738        free(rpc->hdr_content_type);
 739        free(rpc->hdr_accept);
 740        free(rpc->buf);
 741        strbuf_release(&buf);
 742        return err;
 743}
 744
 745static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 746{
 747        struct walker *walker;
 748        char **targets;
 749        int ret, i;
 750
 751        ALLOC_ARRAY(targets, nr_heads);
 752        if (options.depth || options.deepen_since)
 753                die("dumb http transport does not support shallow capabilities");
 754        for (i = 0; i < nr_heads; i++)
 755                targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
 756
 757        walker = get_http_walker(url.buf);
 758        walker->get_all = 1;
 759        walker->get_tree = 1;
 760        walker->get_history = 1;
 761        walker->get_verbosely = options.verbosity >= 3;
 762        walker->get_recover = 0;
 763        ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 764        walker_free(walker);
 765
 766        for (i = 0; i < nr_heads; i++)
 767                free(targets[i]);
 768        free(targets);
 769
 770        return ret ? error("fetch failed.") : 0;
 771}
 772
 773static int fetch_git(struct discovery *heads,
 774        int nr_heads, struct ref **to_fetch)
 775{
 776        struct rpc_state rpc;
 777        struct strbuf preamble = STRBUF_INIT;
 778        int i, err;
 779        struct argv_array args = ARGV_ARRAY_INIT;
 780
 781        argv_array_pushl(&args, "fetch-pack", "--stateless-rpc",
 782                         "--stdin", "--lock-pack", NULL);
 783        if (options.followtags)
 784                argv_array_push(&args, "--include-tag");
 785        if (options.thin)
 786                argv_array_push(&args, "--thin");
 787        if (options.verbosity >= 3)
 788                argv_array_pushl(&args, "-v", "-v", NULL);
 789        if (options.check_self_contained_and_connected)
 790                argv_array_push(&args, "--check-self-contained-and-connected");
 791        if (options.cloning)
 792                argv_array_push(&args, "--cloning");
 793        if (options.update_shallow)
 794                argv_array_push(&args, "--update-shallow");
 795        if (!options.progress)
 796                argv_array_push(&args, "--no-progress");
 797        if (options.depth)
 798                argv_array_pushf(&args, "--depth=%lu", options.depth);
 799        if (options.deepen_since)
 800                argv_array_pushf(&args, "--shallow-since=%s", options.deepen_since);
 801        for (i = 0; i < options.deepen_not.nr; i++)
 802                argv_array_pushf(&args, "--shallow-exclude=%s",
 803                                 options.deepen_not.items[i].string);
 804        if (options.deepen_relative && options.depth)
 805                argv_array_push(&args, "--deepen-relative");
 806        argv_array_push(&args, url.buf);
 807
 808        for (i = 0; i < nr_heads; i++) {
 809                struct ref *ref = to_fetch[i];
 810                if (!*ref->name)
 811                        die("cannot fetch by sha1 over smart http");
 812                packet_buf_write(&preamble, "%s %s\n",
 813                                 oid_to_hex(&ref->old_oid), ref->name);
 814        }
 815        packet_buf_flush(&preamble);
 816
 817        memset(&rpc, 0, sizeof(rpc));
 818        rpc.service_name = "git-upload-pack",
 819        rpc.argv = args.argv;
 820        rpc.stdin_preamble = &preamble;
 821        rpc.gzip_request = 1;
 822
 823        err = rpc_service(&rpc, heads);
 824        if (rpc.result.len)
 825                write_or_die(1, rpc.result.buf, rpc.result.len);
 826        strbuf_release(&rpc.result);
 827        strbuf_release(&preamble);
 828        argv_array_clear(&args);
 829        return err;
 830}
 831
 832static int fetch(int nr_heads, struct ref **to_fetch)
 833{
 834        struct discovery *d = discover_refs("git-upload-pack", 0);
 835        if (d->proto_git)
 836                return fetch_git(d, nr_heads, to_fetch);
 837        else
 838                return fetch_dumb(nr_heads, to_fetch);
 839}
 840
 841static void parse_fetch(struct strbuf *buf)
 842{
 843        struct ref **to_fetch = NULL;
 844        struct ref *list_head = NULL;
 845        struct ref **list = &list_head;
 846        int alloc_heads = 0, nr_heads = 0;
 847
 848        do {
 849                const char *p;
 850                if (skip_prefix(buf->buf, "fetch ", &p)) {
 851                        const char *name;
 852                        struct ref *ref;
 853                        struct object_id old_oid;
 854
 855                        if (get_oid_hex(p, &old_oid))
 856                                die("protocol error: expected sha/ref, got %s'", p);
 857                        if (p[GIT_SHA1_HEXSZ] == ' ')
 858                                name = p + GIT_SHA1_HEXSZ + 1;
 859                        else if (!p[GIT_SHA1_HEXSZ])
 860                                name = "";
 861                        else
 862                                die("protocol error: expected sha/ref, got %s'", p);
 863
 864                        ref = alloc_ref(name);
 865                        oidcpy(&ref->old_oid, &old_oid);
 866
 867                        *list = ref;
 868                        list = &ref->next;
 869
 870                        ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 871                        to_fetch[nr_heads++] = ref;
 872                }
 873                else
 874                        die("http transport does not support %s", buf->buf);
 875
 876                strbuf_reset(buf);
 877                if (strbuf_getline_lf(buf, stdin) == EOF)
 878                        return;
 879                if (!*buf->buf)
 880                        break;
 881        } while (1);
 882
 883        if (fetch(nr_heads, to_fetch))
 884                exit(128); /* error already reported */
 885        free_refs(list_head);
 886        free(to_fetch);
 887
 888        printf("\n");
 889        fflush(stdout);
 890        strbuf_reset(buf);
 891}
 892
 893static int push_dav(int nr_spec, char **specs)
 894{
 895        struct child_process child = CHILD_PROCESS_INIT;
 896        size_t i;
 897
 898        child.git_cmd = 1;
 899        argv_array_push(&child.args, "http-push");
 900        argv_array_push(&child.args, "--helper-status");
 901        if (options.dry_run)
 902                argv_array_push(&child.args, "--dry-run");
 903        if (options.verbosity > 1)
 904                argv_array_push(&child.args, "--verbose");
 905        argv_array_push(&child.args, url.buf);
 906        for (i = 0; i < nr_spec; i++)
 907                argv_array_push(&child.args, specs[i]);
 908
 909        if (run_command(&child))
 910                die("git-http-push failed");
 911        return 0;
 912}
 913
 914static int push_git(struct discovery *heads, int nr_spec, char **specs)
 915{
 916        struct rpc_state rpc;
 917        int i, err;
 918        struct argv_array args;
 919        struct string_list_item *cas_option;
 920        struct strbuf preamble = STRBUF_INIT;
 921
 922        argv_array_init(&args);
 923        argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
 924                         NULL);
 925
 926        if (options.thin)
 927                argv_array_push(&args, "--thin");
 928        if (options.dry_run)
 929                argv_array_push(&args, "--dry-run");
 930        if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
 931                argv_array_push(&args, "--signed=yes");
 932        else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
 933                argv_array_push(&args, "--signed=if-asked");
 934        if (options.verbosity == 0)
 935                argv_array_push(&args, "--quiet");
 936        else if (options.verbosity > 1)
 937                argv_array_push(&args, "--verbose");
 938        argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
 939        for_each_string_list_item(cas_option, &cas_options)
 940                argv_array_push(&args, cas_option->string);
 941        argv_array_push(&args, url.buf);
 942
 943        argv_array_push(&args, "--stdin");
 944        for (i = 0; i < nr_spec; i++)
 945                packet_buf_write(&preamble, "%s\n", specs[i]);
 946        packet_buf_flush(&preamble);
 947
 948        memset(&rpc, 0, sizeof(rpc));
 949        rpc.service_name = "git-receive-pack",
 950        rpc.argv = args.argv;
 951        rpc.stdin_preamble = &preamble;
 952
 953        err = rpc_service(&rpc, heads);
 954        if (rpc.result.len)
 955                write_or_die(1, rpc.result.buf, rpc.result.len);
 956        strbuf_release(&rpc.result);
 957        strbuf_release(&preamble);
 958        argv_array_clear(&args);
 959        return err;
 960}
 961
 962static int push(int nr_spec, char **specs)
 963{
 964        struct discovery *heads = discover_refs("git-receive-pack", 1);
 965        int ret;
 966
 967        if (heads->proto_git)
 968                ret = push_git(heads, nr_spec, specs);
 969        else
 970                ret = push_dav(nr_spec, specs);
 971        free_discovery(heads);
 972        return ret;
 973}
 974
 975static void parse_push(struct strbuf *buf)
 976{
 977        char **specs = NULL;
 978        int alloc_spec = 0, nr_spec = 0, i, ret;
 979
 980        do {
 981                if (starts_with(buf->buf, "push ")) {
 982                        ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 983                        specs[nr_spec++] = xstrdup(buf->buf + 5);
 984                }
 985                else
 986                        die("http transport does not support %s", buf->buf);
 987
 988                strbuf_reset(buf);
 989                if (strbuf_getline_lf(buf, stdin) == EOF)
 990                        goto free_specs;
 991                if (!*buf->buf)
 992                        break;
 993        } while (1);
 994
 995        ret = push(nr_spec, specs);
 996        printf("\n");
 997        fflush(stdout);
 998
 999        if (ret)
1000                exit(128); /* error already reported */
1001
1002 free_specs:
1003        for (i = 0; i < nr_spec; i++)
1004                free(specs[i]);
1005        free(specs);
1006}
1007
1008int cmd_main(int argc, const char **argv)
1009{
1010        struct strbuf buf = STRBUF_INIT;
1011        int nongit;
1012
1013        setup_git_directory_gently(&nongit);
1014        if (argc < 2) {
1015                error("remote-curl: usage: git remote-curl <remote> [<url>]");
1016                return 1;
1017        }
1018
1019        options.verbosity = 1;
1020        options.progress = !!isatty(2);
1021        options.thin = 1;
1022        string_list_init(&options.deepen_not, 1);
1023
1024        remote = remote_get(argv[1]);
1025
1026        if (argc > 2) {
1027                end_url_with_slash(&url, argv[2]);
1028        } else {
1029                end_url_with_slash(&url, remote->url[0]);
1030        }
1031
1032        http_init(remote, url.buf, 0);
1033
1034        do {
1035                const char *arg;
1036
1037                if (strbuf_getline_lf(&buf, stdin) == EOF) {
1038                        if (ferror(stdin))
1039                                error("remote-curl: error reading command stream from git");
1040                        return 1;
1041                }
1042                if (buf.len == 0)
1043                        break;
1044                if (starts_with(buf.buf, "fetch ")) {
1045                        if (nongit)
1046                                die("remote-curl: fetch attempted without a local repo");
1047                        parse_fetch(&buf);
1048
1049                } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1050                        int for_push = !!strstr(buf.buf + 4, "for-push");
1051                        output_refs(get_refs(for_push));
1052
1053                } else if (starts_with(buf.buf, "push ")) {
1054                        parse_push(&buf);
1055
1056                } else if (skip_prefix(buf.buf, "option ", &arg)) {
1057                        char *value = strchr(arg, ' ');
1058                        int result;
1059
1060                        if (value)
1061                                *value++ = '\0';
1062                        else
1063                                value = "true";
1064
1065                        result = set_option(arg, value);
1066                        if (!result)
1067                                printf("ok\n");
1068                        else if (result < 0)
1069                                printf("error invalid value\n");
1070                        else
1071                                printf("unsupported\n");
1072                        fflush(stdout);
1073
1074                } else if (!strcmp(buf.buf, "capabilities")) {
1075                        printf("fetch\n");
1076                        printf("option\n");
1077                        printf("push\n");
1078                        printf("check-connectivity\n");
1079                        printf("\n");
1080                        fflush(stdout);
1081                } else {
1082                        error("remote-curl: unknown command '%s' from git", buf.buf);
1083                        return 1;
1084                }
1085                strbuf_reset(&buf);
1086        } while (1);
1087
1088        http_cleanup();
1089
1090        return 0;
1091}