Andrew's git / gitweb.git / remote-curl.c
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remote-curl.con commit ref_transaction_commit(): simplify code using temporary variables (cb198d2)
   1#include "cache.h"
   2#include "remote.h"
   3#include "strbuf.h"
   4#include "walker.h"
   5#include "http.h"
   6#include "exec_cmd.h"
   7#include "run-command.h"
   8#include "pkt-line.h"
   9#include "string-list.h"
  10#include "sideband.h"
  11#include "argv-array.h"
  12#include "credential.h"
  13#include "sha1-array.h"
  14
  15static struct remote *remote;
  16/* always ends with a trailing slash */
  17static struct strbuf url = STRBUF_INIT;
  18
  19struct options {
  20        int verbosity;
  21        unsigned long depth;
  22        unsigned progress : 1,
  23                check_self_contained_and_connected : 1,
  24                cloning : 1,
  25                update_shallow : 1,
  26                followtags : 1,
  27                dry_run : 1,
  28                thin : 1;
  29};
  30static struct options options;
  31static struct string_list cas_options = STRING_LIST_INIT_DUP;
  32
  33static int set_option(const char *name, const char *value)
  34{
  35        if (!strcmp(name, "verbosity")) {
  36                char *end;
  37                int v = strtol(value, &end, 10);
  38                if (value == end || *end)
  39                        return -1;
  40                options.verbosity = v;
  41                return 0;
  42        }
  43        else if (!strcmp(name, "progress")) {
  44                if (!strcmp(value, "true"))
  45                        options.progress = 1;
  46                else if (!strcmp(value, "false"))
  47                        options.progress = 0;
  48                else
  49                        return -1;
  50                return 0;
  51        }
  52        else if (!strcmp(name, "depth")) {
  53                char *end;
  54                unsigned long v = strtoul(value, &end, 10);
  55                if (value == end || *end)
  56                        return -1;
  57                options.depth = v;
  58                return 0;
  59        }
  60        else if (!strcmp(name, "followtags")) {
  61                if (!strcmp(value, "true"))
  62                        options.followtags = 1;
  63                else if (!strcmp(value, "false"))
  64                        options.followtags = 0;
  65                else
  66                        return -1;
  67                return 0;
  68        }
  69        else if (!strcmp(name, "dry-run")) {
  70                if (!strcmp(value, "true"))
  71                        options.dry_run = 1;
  72                else if (!strcmp(value, "false"))
  73                        options.dry_run = 0;
  74                else
  75                        return -1;
  76                return 0;
  77        }
  78        else if (!strcmp(name, "check-connectivity")) {
  79                if (!strcmp(value, "true"))
  80                        options.check_self_contained_and_connected = 1;
  81                else if (!strcmp(value, "false"))
  82                        options.check_self_contained_and_connected = 0;
  83                else
  84                        return -1;
  85                return 0;
  86        }
  87        else if (!strcmp(name, "cas")) {
  88                struct strbuf val = STRBUF_INIT;
  89                strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
  90                string_list_append(&cas_options, val.buf);
  91                strbuf_release(&val);
  92                return 0;
  93        } else if (!strcmp(name, "cloning")) {
  94                if (!strcmp(value, "true"))
  95                        options.cloning = 1;
  96                else if (!strcmp(value, "false"))
  97                        options.cloning = 0;
  98                else
  99                        return -1;
 100                return 0;
 101        } else if (!strcmp(name, "update-shallow")) {
 102                if (!strcmp(value, "true"))
 103                        options.update_shallow = 1;
 104                else if (!strcmp(value, "false"))
 105                        options.update_shallow = 0;
 106                else
 107                        return -1;
 108                return 0;
 109        } else {
 110                return 1 /* unsupported */;
 111        }
 112}
 113
 114struct discovery {
 115        const char *service;
 116        char *buf_alloc;
 117        char *buf;
 118        size_t len;
 119        struct ref *refs;
 120        struct sha1_array shallow;
 121        unsigned proto_git : 1;
 122};
 123static struct discovery *last_discovery;
 124
 125static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 126{
 127        struct ref *list = NULL;
 128        get_remote_heads(-1, heads->buf, heads->len, &list,
 129                         for_push ? REF_NORMAL : 0, NULL, &heads->shallow);
 130        return list;
 131}
 132
 133static struct ref *parse_info_refs(struct discovery *heads)
 134{
 135        char *data, *start, *mid;
 136        char *ref_name;
 137        int i = 0;
 138
 139        struct ref *refs = NULL;
 140        struct ref *ref = NULL;
 141        struct ref *last_ref = NULL;
 142
 143        data = heads->buf;
 144        start = NULL;
 145        mid = data;
 146        while (i < heads->len) {
 147                if (!start) {
 148                        start = &data[i];
 149                }
 150                if (data[i] == '\t')
 151                        mid = &data[i];
 152                if (data[i] == '\n') {
 153                        if (mid - start != 40)
 154                                die("%sinfo/refs not valid: is this a git repository?",
 155                                    url.buf);
 156                        data[i] = 0;
 157                        ref_name = mid + 1;
 158                        ref = xmalloc(sizeof(struct ref) +
 159                                      strlen(ref_name) + 1);
 160                        memset(ref, 0, sizeof(struct ref));
 161                        strcpy(ref->name, ref_name);
 162                        get_sha1_hex(start, ref->old_sha1);
 163                        if (!refs)
 164                                refs = ref;
 165                        if (last_ref)
 166                                last_ref->next = ref;
 167                        last_ref = ref;
 168                        start = NULL;
 169                }
 170                i++;
 171        }
 172
 173        ref = alloc_ref("HEAD");
 174        if (!http_fetch_ref(url.buf, ref) &&
 175            !resolve_remote_symref(ref, refs)) {
 176                ref->next = refs;
 177                refs = ref;
 178        } else {
 179                free(ref);
 180        }
 181
 182        return refs;
 183}
 184
 185static void free_discovery(struct discovery *d)
 186{
 187        if (d) {
 188                if (d == last_discovery)
 189                        last_discovery = NULL;
 190                free(d->shallow.sha1);
 191                free(d->buf_alloc);
 192                free_refs(d->refs);
 193                free(d);
 194        }
 195}
 196
 197static int show_http_message(struct strbuf *type, struct strbuf *msg)
 198{
 199        const char *p, *eol;
 200
 201        /*
 202         * We only show text/plain parts, as other types are likely
 203         * to be ugly to look at on the user's terminal.
 204         *
 205         * TODO should handle "; charset=XXX", and re-encode into
 206         * logoutputencoding
 207         */
 208        if (strcasecmp(type->buf, "text/plain"))
 209                return -1;
 210
 211        strbuf_trim(msg);
 212        if (!msg->len)
 213                return -1;
 214
 215        p = msg->buf;
 216        do {
 217                eol = strchrnul(p, '\n');
 218                fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 219                p = eol + 1;
 220        } while(*eol);
 221        return 0;
 222}
 223
 224static struct discovery* discover_refs(const char *service, int for_push)
 225{
 226        struct strbuf exp = STRBUF_INIT;
 227        struct strbuf type = STRBUF_INIT;
 228        struct strbuf buffer = STRBUF_INIT;
 229        struct strbuf refs_url = STRBUF_INIT;
 230        struct strbuf effective_url = STRBUF_INIT;
 231        struct discovery *last = last_discovery;
 232        int http_ret, maybe_smart = 0;
 233        struct http_get_options options;
 234
 235        if (last && !strcmp(service, last->service))
 236                return last;
 237        free_discovery(last);
 238
 239        strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 240        if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
 241             git_env_bool("GIT_SMART_HTTP", 1)) {
 242                maybe_smart = 1;
 243                if (!strchr(url.buf, '?'))
 244                        strbuf_addch(&refs_url, '?');
 245                else
 246                        strbuf_addch(&refs_url, '&');
 247                strbuf_addf(&refs_url, "service=%s", service);
 248        }
 249
 250        memset(&options, 0, sizeof(options));
 251        options.content_type = &type;
 252        options.effective_url = &effective_url;
 253        options.base_url = &url;
 254        options.no_cache = 1;
 255        options.keep_error = 1;
 256
 257        http_ret = http_get_strbuf(refs_url.buf, &buffer, &options);
 258        switch (http_ret) {
 259        case HTTP_OK:
 260                break;
 261        case HTTP_MISSING_TARGET:
 262                show_http_message(&type, &buffer);
 263                die("repository '%s' not found", url.buf);
 264        case HTTP_NOAUTH:
 265                show_http_message(&type, &buffer);
 266                die("Authentication failed for '%s'", url.buf);
 267        default:
 268                show_http_message(&type, &buffer);
 269                die("unable to access '%s': %s", url.buf, curl_errorstr);
 270        }
 271
 272        last= xcalloc(1, sizeof(*last_discovery));
 273        last->service = service;
 274        last->buf_alloc = strbuf_detach(&buffer, &last->len);
 275        last->buf = last->buf_alloc;
 276
 277        strbuf_addf(&exp, "application/x-%s-advertisement", service);
 278        if (maybe_smart &&
 279            (5 <= last->len && last->buf[4] == '#') &&
 280            !strbuf_cmp(&exp, &type)) {
 281                char *line;
 282
 283                /*
 284                 * smart HTTP response; validate that the service
 285                 * pkt-line matches our request.
 286                 */
 287                line = packet_read_line_buf(&last->buf, &last->len, NULL);
 288
 289                strbuf_reset(&exp);
 290                strbuf_addf(&exp, "# service=%s", service);
 291                if (strcmp(line, exp.buf))
 292                        die("invalid server response; got '%s'", line);
 293                strbuf_release(&exp);
 294
 295                /* The header can include additional metadata lines, up
 296                 * until a packet flush marker.  Ignore these now, but
 297                 * in the future we might start to scan them.
 298                 */
 299                while (packet_read_line_buf(&last->buf, &last->len, NULL))
 300                        ;
 301
 302                last->proto_git = 1;
 303        }
 304
 305        if (last->proto_git)
 306                last->refs = parse_git_refs(last, for_push);
 307        else
 308                last->refs = parse_info_refs(last);
 309
 310        strbuf_release(&refs_url);
 311        strbuf_release(&exp);
 312        strbuf_release(&type);
 313        strbuf_release(&effective_url);
 314        strbuf_release(&buffer);
 315        last_discovery = last;
 316        return last;
 317}
 318
 319static struct ref *get_refs(int for_push)
 320{
 321        struct discovery *heads;
 322
 323        if (for_push)
 324                heads = discover_refs("git-receive-pack", for_push);
 325        else
 326                heads = discover_refs("git-upload-pack", for_push);
 327
 328        return heads->refs;
 329}
 330
 331static void output_refs(struct ref *refs)
 332{
 333        struct ref *posn;
 334        for (posn = refs; posn; posn = posn->next) {
 335                if (posn->symref)
 336                        printf("@%s %s\n", posn->symref, posn->name);
 337                else
 338                        printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
 339        }
 340        printf("\n");
 341        fflush(stdout);
 342}
 343
 344struct rpc_state {
 345        const char *service_name;
 346        const char **argv;
 347        struct strbuf *stdin_preamble;
 348        char *service_url;
 349        char *hdr_content_type;
 350        char *hdr_accept;
 351        char *buf;
 352        size_t alloc;
 353        size_t len;
 354        size_t pos;
 355        int in;
 356        int out;
 357        struct strbuf result;
 358        unsigned gzip_request : 1;
 359        unsigned initial_buffer : 1;
 360};
 361
 362static size_t rpc_out(void *ptr, size_t eltsize,
 363                size_t nmemb, void *buffer_)
 364{
 365        size_t max = eltsize * nmemb;
 366        struct rpc_state *rpc = buffer_;
 367        size_t avail = rpc->len - rpc->pos;
 368
 369        if (!avail) {
 370                rpc->initial_buffer = 0;
 371                avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 372                if (!avail)
 373                        return 0;
 374                rpc->pos = 0;
 375                rpc->len = avail;
 376        }
 377
 378        if (max < avail)
 379                avail = max;
 380        memcpy(ptr, rpc->buf + rpc->pos, avail);
 381        rpc->pos += avail;
 382        return avail;
 383}
 384
 385#ifndef NO_CURL_IOCTL
 386static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 387{
 388        struct rpc_state *rpc = clientp;
 389
 390        switch (cmd) {
 391        case CURLIOCMD_NOP:
 392                return CURLIOE_OK;
 393
 394        case CURLIOCMD_RESTARTREAD:
 395                if (rpc->initial_buffer) {
 396                        rpc->pos = 0;
 397                        return CURLIOE_OK;
 398                }
 399                fprintf(stderr, "Unable to rewind rpc post data - try increasing http.postBuffer\n");
 400                return CURLIOE_FAILRESTART;
 401
 402        default:
 403                return CURLIOE_UNKNOWNCMD;
 404        }
 405}
 406#endif
 407
 408static size_t rpc_in(char *ptr, size_t eltsize,
 409                size_t nmemb, void *buffer_)
 410{
 411        size_t size = eltsize * nmemb;
 412        struct rpc_state *rpc = buffer_;
 413        write_or_die(rpc->in, ptr, size);
 414        return size;
 415}
 416
 417static int run_slot(struct active_request_slot *slot,
 418                    struct slot_results *results)
 419{
 420        int err;
 421        struct slot_results results_buf;
 422
 423        if (!results)
 424                results = &results_buf;
 425
 426        err = run_one_slot(slot, results);
 427
 428        if (err != HTTP_OK && err != HTTP_REAUTH) {
 429                error("RPC failed; result=%d, HTTP code = %ld",
 430                      results->curl_result, results->http_code);
 431        }
 432
 433        return err;
 434}
 435
 436static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 437{
 438        struct active_request_slot *slot;
 439        struct curl_slist *headers = NULL;
 440        struct strbuf buf = STRBUF_INIT;
 441        int err;
 442
 443        slot = get_active_slot();
 444
 445        headers = curl_slist_append(headers, rpc->hdr_content_type);
 446        headers = curl_slist_append(headers, rpc->hdr_accept);
 447
 448        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 449        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 450        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 451        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 452        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 453        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 454        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 455        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 456        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 457
 458        err = run_slot(slot, results);
 459
 460        curl_slist_free_all(headers);
 461        strbuf_release(&buf);
 462        return err;
 463}
 464
 465static int post_rpc(struct rpc_state *rpc)
 466{
 467        struct active_request_slot *slot;
 468        struct curl_slist *headers = NULL;
 469        int use_gzip = rpc->gzip_request;
 470        char *gzip_body = NULL;
 471        size_t gzip_size = 0;
 472        int err, large_request = 0;
 473        int needs_100_continue = 0;
 474
 475        /* Try to load the entire request, if we can fit it into the
 476         * allocated buffer space we can use HTTP/1.0 and avoid the
 477         * chunked encoding mess.
 478         */
 479        while (1) {
 480                size_t left = rpc->alloc - rpc->len;
 481                char *buf = rpc->buf + rpc->len;
 482                int n;
 483
 484                if (left < LARGE_PACKET_MAX) {
 485                        large_request = 1;
 486                        use_gzip = 0;
 487                        break;
 488                }
 489
 490                n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 491                if (!n)
 492                        break;
 493                rpc->len += n;
 494        }
 495
 496        if (large_request) {
 497                struct slot_results results;
 498
 499                do {
 500                        err = probe_rpc(rpc, &results);
 501                        if (err == HTTP_REAUTH)
 502                                credential_fill(&http_auth);
 503                } while (err == HTTP_REAUTH);
 504                if (err != HTTP_OK)
 505                        return -1;
 506
 507                if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 508                        needs_100_continue = 1;
 509        }
 510
 511        headers = curl_slist_append(headers, rpc->hdr_content_type);
 512        headers = curl_slist_append(headers, rpc->hdr_accept);
 513        headers = curl_slist_append(headers, needs_100_continue ?
 514                "Expect: 100-continue" : "Expect:");
 515
 516retry:
 517        slot = get_active_slot();
 518
 519        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 520        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 521        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 522        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 523
 524        if (large_request) {
 525                /* The request body is large and the size cannot be predicted.
 526                 * We must use chunked encoding to send it.
 527                 */
 528                headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 529                rpc->initial_buffer = 1;
 530                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 531                curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 532#ifndef NO_CURL_IOCTL
 533                curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 534                curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 535#endif
 536                if (options.verbosity > 1) {
 537                        fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 538                        fflush(stderr);
 539                }
 540
 541        } else if (gzip_body) {
 542                /*
 543                 * If we are looping to retry authentication, then the previous
 544                 * run will have set up the headers and gzip buffer already,
 545                 * and we just need to send it.
 546                 */
 547                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 548                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 549
 550        } else if (use_gzip && 1024 < rpc->len) {
 551                /* The client backend isn't giving us compressed data so
 552                 * we can try to deflate it ourselves, this may save on.
 553                 * the transfer time.
 554                 */
 555                git_zstream stream;
 556                int ret;
 557
 558                memset(&stream, 0, sizeof(stream));
 559                git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 560                gzip_size = git_deflate_bound(&stream, rpc->len);
 561                gzip_body = xmalloc(gzip_size);
 562
 563                stream.next_in = (unsigned char *)rpc->buf;
 564                stream.avail_in = rpc->len;
 565                stream.next_out = (unsigned char *)gzip_body;
 566                stream.avail_out = gzip_size;
 567
 568                ret = git_deflate(&stream, Z_FINISH);
 569                if (ret != Z_STREAM_END)
 570                        die("cannot deflate request; zlib deflate error %d", ret);
 571
 572                ret = git_deflate_end_gently(&stream);
 573                if (ret != Z_OK)
 574                        die("cannot deflate request; zlib end error %d", ret);
 575
 576                gzip_size = stream.total_out;
 577
 578                headers = curl_slist_append(headers, "Content-Encoding: gzip");
 579                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 580                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 581
 582                if (options.verbosity > 1) {
 583                        fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 584                                rpc->service_name,
 585                                (unsigned long)rpc->len, (unsigned long)gzip_size);
 586                        fflush(stderr);
 587                }
 588        } else {
 589                /* We know the complete request size in advance, use the
 590                 * more normal Content-Length approach.
 591                 */
 592                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 593                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 594                if (options.verbosity > 1) {
 595                        fprintf(stderr, "POST %s (%lu bytes)\n",
 596                                rpc->service_name, (unsigned long)rpc->len);
 597                        fflush(stderr);
 598                }
 599        }
 600
 601        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 602        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 603        curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 604
 605        err = run_slot(slot, NULL);
 606        if (err == HTTP_REAUTH && !large_request) {
 607                credential_fill(&http_auth);
 608                goto retry;
 609        }
 610        if (err != HTTP_OK)
 611                err = -1;
 612
 613        curl_slist_free_all(headers);
 614        free(gzip_body);
 615        return err;
 616}
 617
 618static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 619{
 620        const char *svc = rpc->service_name;
 621        struct strbuf buf = STRBUF_INIT;
 622        struct strbuf *preamble = rpc->stdin_preamble;
 623        struct child_process client;
 624        int err = 0;
 625
 626        memset(&client, 0, sizeof(client));
 627        client.in = -1;
 628        client.out = -1;
 629        client.git_cmd = 1;
 630        client.argv = rpc->argv;
 631        if (start_command(&client))
 632                exit(1);
 633        if (preamble)
 634                write_or_die(client.in, preamble->buf, preamble->len);
 635        if (heads)
 636                write_or_die(client.in, heads->buf, heads->len);
 637
 638        rpc->alloc = http_post_buffer;
 639        rpc->buf = xmalloc(rpc->alloc);
 640        rpc->in = client.in;
 641        rpc->out = client.out;
 642        strbuf_init(&rpc->result, 0);
 643
 644        strbuf_addf(&buf, "%s%s", url.buf, svc);
 645        rpc->service_url = strbuf_detach(&buf, NULL);
 646
 647        strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 648        rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 649
 650        strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 651        rpc->hdr_accept = strbuf_detach(&buf, NULL);
 652
 653        while (!err) {
 654                int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 655                if (!n)
 656                        break;
 657                rpc->pos = 0;
 658                rpc->len = n;
 659                err |= post_rpc(rpc);
 660        }
 661
 662        close(client.in);
 663        client.in = -1;
 664        if (!err) {
 665                strbuf_read(&rpc->result, client.out, 0);
 666        } else {
 667                char buf[4096];
 668                for (;;)
 669                        if (xread(client.out, buf, sizeof(buf)) <= 0)
 670                                break;
 671        }
 672
 673        close(client.out);
 674        client.out = -1;
 675
 676        err |= finish_command(&client);
 677        free(rpc->service_url);
 678        free(rpc->hdr_content_type);
 679        free(rpc->hdr_accept);
 680        free(rpc->buf);
 681        strbuf_release(&buf);
 682        return err;
 683}
 684
 685static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 686{
 687        struct walker *walker;
 688        char **targets = xmalloc(nr_heads * sizeof(char*));
 689        int ret, i;
 690
 691        if (options.depth)
 692                die("dumb http transport does not support --depth");
 693        for (i = 0; i < nr_heads; i++)
 694                targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 695
 696        walker = get_http_walker(url.buf);
 697        walker->get_all = 1;
 698        walker->get_tree = 1;
 699        walker->get_history = 1;
 700        walker->get_verbosely = options.verbosity >= 3;
 701        walker->get_recover = 0;
 702        ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 703        walker_free(walker);
 704
 705        for (i = 0; i < nr_heads; i++)
 706                free(targets[i]);
 707        free(targets);
 708
 709        return ret ? error("Fetch failed.") : 0;
 710}
 711
 712static int fetch_git(struct discovery *heads,
 713        int nr_heads, struct ref **to_fetch)
 714{
 715        struct rpc_state rpc;
 716        struct strbuf preamble = STRBUF_INIT;
 717        char *depth_arg = NULL;
 718        int argc = 0, i, err;
 719        const char *argv[17];
 720
 721        argv[argc++] = "fetch-pack";
 722        argv[argc++] = "--stateless-rpc";
 723        argv[argc++] = "--stdin";
 724        argv[argc++] = "--lock-pack";
 725        if (options.followtags)
 726                argv[argc++] = "--include-tag";
 727        if (options.thin)
 728                argv[argc++] = "--thin";
 729        if (options.verbosity >= 3) {
 730                argv[argc++] = "-v";
 731                argv[argc++] = "-v";
 732        }
 733        if (options.check_self_contained_and_connected)
 734                argv[argc++] = "--check-self-contained-and-connected";
 735        if (options.cloning)
 736                argv[argc++] = "--cloning";
 737        if (options.update_shallow)
 738                argv[argc++] = "--update-shallow";
 739        if (!options.progress)
 740                argv[argc++] = "--no-progress";
 741        if (options.depth) {
 742                struct strbuf buf = STRBUF_INIT;
 743                strbuf_addf(&buf, "--depth=%lu", options.depth);
 744                depth_arg = strbuf_detach(&buf, NULL);
 745                argv[argc++] = depth_arg;
 746        }
 747        argv[argc++] = url.buf;
 748        argv[argc++] = NULL;
 749
 750        for (i = 0; i < nr_heads; i++) {
 751                struct ref *ref = to_fetch[i];
 752                if (!ref->name || !*ref->name)
 753                        die("cannot fetch by sha1 over smart http");
 754                packet_buf_write(&preamble, "%s %s\n",
 755                                 sha1_to_hex(ref->old_sha1), ref->name);
 756        }
 757        packet_buf_flush(&preamble);
 758
 759        memset(&rpc, 0, sizeof(rpc));
 760        rpc.service_name = "git-upload-pack",
 761        rpc.argv = argv;
 762        rpc.stdin_preamble = &preamble;
 763        rpc.gzip_request = 1;
 764
 765        err = rpc_service(&rpc, heads);
 766        if (rpc.result.len)
 767                write_or_die(1, rpc.result.buf, rpc.result.len);
 768        strbuf_release(&rpc.result);
 769        strbuf_release(&preamble);
 770        free(depth_arg);
 771        return err;
 772}
 773
 774static int fetch(int nr_heads, struct ref **to_fetch)
 775{
 776        struct discovery *d = discover_refs("git-upload-pack", 0);
 777        if (d->proto_git)
 778                return fetch_git(d, nr_heads, to_fetch);
 779        else
 780                return fetch_dumb(nr_heads, to_fetch);
 781}
 782
 783static void parse_fetch(struct strbuf *buf)
 784{
 785        struct ref **to_fetch = NULL;
 786        struct ref *list_head = NULL;
 787        struct ref **list = &list_head;
 788        int alloc_heads = 0, nr_heads = 0;
 789
 790        do {
 791                if (starts_with(buf->buf, "fetch ")) {
 792                        char *p = buf->buf + strlen("fetch ");
 793                        char *name;
 794                        struct ref *ref;
 795                        unsigned char old_sha1[20];
 796
 797                        if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 798                                die("protocol error: expected sha/ref, got %s'", p);
 799                        if (p[40] == ' ')
 800                                name = p + 41;
 801                        else if (!p[40])
 802                                name = "";
 803                        else
 804                                die("protocol error: expected sha/ref, got %s'", p);
 805
 806                        ref = alloc_ref(name);
 807                        hashcpy(ref->old_sha1, old_sha1);
 808
 809                        *list = ref;
 810                        list = &ref->next;
 811
 812                        ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 813                        to_fetch[nr_heads++] = ref;
 814                }
 815                else
 816                        die("http transport does not support %s", buf->buf);
 817
 818                strbuf_reset(buf);
 819                if (strbuf_getline(buf, stdin, '\n') == EOF)
 820                        return;
 821                if (!*buf->buf)
 822                        break;
 823        } while (1);
 824
 825        if (fetch(nr_heads, to_fetch))
 826                exit(128); /* error already reported */
 827        free_refs(list_head);
 828        free(to_fetch);
 829
 830        printf("\n");
 831        fflush(stdout);
 832        strbuf_reset(buf);
 833}
 834
 835static int push_dav(int nr_spec, char **specs)
 836{
 837        const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 838        int argc = 0, i;
 839
 840        argv[argc++] = "http-push";
 841        argv[argc++] = "--helper-status";
 842        if (options.dry_run)
 843                argv[argc++] = "--dry-run";
 844        if (options.verbosity > 1)
 845                argv[argc++] = "--verbose";
 846        argv[argc++] = url.buf;
 847        for (i = 0; i < nr_spec; i++)
 848                argv[argc++] = specs[i];
 849        argv[argc++] = NULL;
 850
 851        if (run_command_v_opt(argv, RUN_GIT_CMD))
 852                die("git-%s failed", argv[0]);
 853        free(argv);
 854        return 0;
 855}
 856
 857static int push_git(struct discovery *heads, int nr_spec, char **specs)
 858{
 859        struct rpc_state rpc;
 860        int i, err;
 861        struct argv_array args;
 862        struct string_list_item *cas_option;
 863
 864        argv_array_init(&args);
 865        argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
 866                         NULL);
 867
 868        if (options.thin)
 869                argv_array_push(&args, "--thin");
 870        if (options.dry_run)
 871                argv_array_push(&args, "--dry-run");
 872        if (options.verbosity == 0)
 873                argv_array_push(&args, "--quiet");
 874        else if (options.verbosity > 1)
 875                argv_array_push(&args, "--verbose");
 876        argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
 877        for_each_string_list_item(cas_option, &cas_options)
 878                argv_array_push(&args, cas_option->string);
 879        argv_array_push(&args, url.buf);
 880        for (i = 0; i < nr_spec; i++)
 881                argv_array_push(&args, specs[i]);
 882
 883        memset(&rpc, 0, sizeof(rpc));
 884        rpc.service_name = "git-receive-pack",
 885        rpc.argv = args.argv;
 886
 887        err = rpc_service(&rpc, heads);
 888        if (rpc.result.len)
 889                write_or_die(1, rpc.result.buf, rpc.result.len);
 890        strbuf_release(&rpc.result);
 891        argv_array_clear(&args);
 892        return err;
 893}
 894
 895static int push(int nr_spec, char **specs)
 896{
 897        struct discovery *heads = discover_refs("git-receive-pack", 1);
 898        int ret;
 899
 900        if (heads->proto_git)
 901                ret = push_git(heads, nr_spec, specs);
 902        else
 903                ret = push_dav(nr_spec, specs);
 904        free_discovery(heads);
 905        return ret;
 906}
 907
 908static void parse_push(struct strbuf *buf)
 909{
 910        char **specs = NULL;
 911        int alloc_spec = 0, nr_spec = 0, i, ret;
 912
 913        do {
 914                if (starts_with(buf->buf, "push ")) {
 915                        ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 916                        specs[nr_spec++] = xstrdup(buf->buf + 5);
 917                }
 918                else
 919                        die("http transport does not support %s", buf->buf);
 920
 921                strbuf_reset(buf);
 922                if (strbuf_getline(buf, stdin, '\n') == EOF)
 923                        goto free_specs;
 924                if (!*buf->buf)
 925                        break;
 926        } while (1);
 927
 928        ret = push(nr_spec, specs);
 929        printf("\n");
 930        fflush(stdout);
 931
 932        if (ret)
 933                exit(128); /* error already reported */
 934
 935 free_specs:
 936        for (i = 0; i < nr_spec; i++)
 937                free(specs[i]);
 938        free(specs);
 939}
 940
 941int main(int argc, const char **argv)
 942{
 943        struct strbuf buf = STRBUF_INIT;
 944        int nongit;
 945
 946        git_extract_argv0_path(argv[0]);
 947        setup_git_directory_gently(&nongit);
 948        if (argc < 2) {
 949                fprintf(stderr, "Remote needed\n");
 950                return 1;
 951        }
 952
 953        options.verbosity = 1;
 954        options.progress = !!isatty(2);
 955        options.thin = 1;
 956
 957        remote = remote_get(argv[1]);
 958
 959        if (argc > 2) {
 960                end_url_with_slash(&url, argv[2]);
 961        } else {
 962                end_url_with_slash(&url, remote->url[0]);
 963        }
 964
 965        http_init(remote, url.buf, 0);
 966
 967        do {
 968                if (strbuf_getline(&buf, stdin, '\n') == EOF) {
 969                        if (ferror(stdin))
 970                                fprintf(stderr, "Error reading command stream\n");
 971                        else
 972                                fprintf(stderr, "Unexpected end of command stream\n");
 973                        return 1;
 974                }
 975                if (buf.len == 0)
 976                        break;
 977                if (starts_with(buf.buf, "fetch ")) {
 978                        if (nongit)
 979                                die("Fetch attempted without a local repo");
 980                        parse_fetch(&buf);
 981
 982                } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
 983                        int for_push = !!strstr(buf.buf + 4, "for-push");
 984                        output_refs(get_refs(for_push));
 985
 986                } else if (starts_with(buf.buf, "push ")) {
 987                        parse_push(&buf);
 988
 989                } else if (starts_with(buf.buf, "option ")) {
 990                        char *name = buf.buf + strlen("option ");
 991                        char *value = strchr(name, ' ');
 992                        int result;
 993
 994                        if (value)
 995                                *value++ = '\0';
 996                        else
 997                                value = "true";
 998
 999                        result = set_option(name, value);
1000                        if (!result)
1001                                printf("ok\n");
1002                        else if (result < 0)
1003                                printf("error invalid value\n");
1004                        else
1005                                printf("unsupported\n");
1006                        fflush(stdout);
1007
1008                } else if (!strcmp(buf.buf, "capabilities")) {
1009                        printf("fetch\n");
1010                        printf("option\n");
1011                        printf("push\n");
1012                        printf("check-connectivity\n");
1013                        printf("\n");
1014                        fflush(stdout);
1015                } else {
1016                        fprintf(stderr, "Unknown command '%s'\n", buf.buf);
1017                        return 1;
1018                }
1019                strbuf_reset(&buf);
1020        } while (1);
1021
1022        http_cleanup();
1023
1024        return 0;
1025}