Andrew's git / gitweb.git / transport.c
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transport.con commit sequencer.c: rework search for start of footer to improve clarity (fa1727f)
   1#include "cache.h"
   2#include "transport.h"
   3#include "run-command.h"
   4#include "pkt-line.h"
   5#include "fetch-pack.h"
   6#include "send-pack.h"
   7#include "walker.h"
   8#include "bundle.h"
   9#include "dir.h"
  10#include "refs.h"
  11#include "branch.h"
  12#include "url.h"
  13#include "submodule.h"
  14#include "string-list.h"
  15
  16/* rsync support */
  17
  18/*
  19 * We copy packed-refs and refs/ into a temporary file, then read the
  20 * loose refs recursively (sorting whenever possible), and then inserting
  21 * those packed refs that are not yet in the list (not validating, but
  22 * assuming that the file is sorted).
  23 *
  24 * Appears refactoring this from refs.c is too cumbersome.
  25 */
  26
  27static int str_cmp(const void *a, const void *b)
  28{
  29        const char *s1 = a;
  30        const char *s2 = b;
  31
  32        return strcmp(s1, s2);
  33}
  34
  35/* path->buf + name_offset is expected to point to "refs/" */
  36
  37static int read_loose_refs(struct strbuf *path, int name_offset,
  38                struct ref **tail)
  39{
  40        DIR *dir = opendir(path->buf);
  41        struct dirent *de;
  42        struct {
  43                char **entries;
  44                int nr, alloc;
  45        } list;
  46        int i, pathlen;
  47
  48        if (!dir)
  49                return -1;
  50
  51        memset (&list, 0, sizeof(list));
  52
  53        while ((de = readdir(dir))) {
  54                if (is_dot_or_dotdot(de->d_name))
  55                        continue;
  56                ALLOC_GROW(list.entries, list.nr + 1, list.alloc);
  57                list.entries[list.nr++] = xstrdup(de->d_name);
  58        }
  59        closedir(dir);
  60
  61        /* sort the list */
  62
  63        qsort(list.entries, list.nr, sizeof(char *), str_cmp);
  64
  65        pathlen = path->len;
  66        strbuf_addch(path, '/');
  67
  68        for (i = 0; i < list.nr; i++, strbuf_setlen(path, pathlen + 1)) {
  69                strbuf_addstr(path, list.entries[i]);
  70                if (read_loose_refs(path, name_offset, tail)) {
  71                        int fd = open(path->buf, O_RDONLY);
  72                        char buffer[40];
  73                        struct ref *next;
  74
  75                        if (fd < 0)
  76                                continue;
  77                        next = alloc_ref(path->buf + name_offset);
  78                        if (read_in_full(fd, buffer, 40) != 40 ||
  79                                        get_sha1_hex(buffer, next->old_sha1)) {
  80                                close(fd);
  81                                free(next);
  82                                continue;
  83                        }
  84                        close(fd);
  85                        (*tail)->next = next;
  86                        *tail = next;
  87                }
  88        }
  89        strbuf_setlen(path, pathlen);
  90
  91        for (i = 0; i < list.nr; i++)
  92                free(list.entries[i]);
  93        free(list.entries);
  94
  95        return 0;
  96}
  97
  98/* insert the packed refs for which no loose refs were found */
  99
 100static void insert_packed_refs(const char *packed_refs, struct ref **list)
 101{
 102        FILE *f = fopen(packed_refs, "r");
 103        static char buffer[PATH_MAX];
 104
 105        if (!f)
 106                return;
 107
 108        for (;;) {
 109                int cmp = cmp, len;
 110
 111                if (!fgets(buffer, sizeof(buffer), f)) {
 112                        fclose(f);
 113                        return;
 114                }
 115
 116                if (hexval(buffer[0]) > 0xf)
 117                        continue;
 118                len = strlen(buffer);
 119                if (len && buffer[len - 1] == '\n')
 120                        buffer[--len] = '\0';
 121                if (len < 41)
 122                        continue;
 123                while ((*list)->next &&
 124                                (cmp = strcmp(buffer + 41,
 125                                      (*list)->next->name)) > 0)
 126                        list = &(*list)->next;
 127                if (!(*list)->next || cmp < 0) {
 128                        struct ref *next = alloc_ref(buffer + 41);
 129                        buffer[40] = '\0';
 130                        if (get_sha1_hex(buffer, next->old_sha1)) {
 131                                warning ("invalid SHA-1: %s", buffer);
 132                                free(next);
 133                                continue;
 134                        }
 135                        next->next = (*list)->next;
 136                        (*list)->next = next;
 137                        list = &(*list)->next;
 138                }
 139        }
 140}
 141
 142static void set_upstreams(struct transport *transport, struct ref *refs,
 143        int pretend)
 144{
 145        struct ref *ref;
 146        for (ref = refs; ref; ref = ref->next) {
 147                const char *localname;
 148                const char *tmp;
 149                const char *remotename;
 150                unsigned char sha[20];
 151                int flag = 0;
 152                /*
 153                 * Check suitability for tracking. Must be successful /
 154                 * already up-to-date ref create/modify (not delete).
 155                 */
 156                if (ref->status != REF_STATUS_OK &&
 157                        ref->status != REF_STATUS_UPTODATE)
 158                        continue;
 159                if (!ref->peer_ref)
 160                        continue;
 161                if (is_null_sha1(ref->new_sha1))
 162                        continue;
 163
 164                /* Follow symbolic refs (mainly for HEAD). */
 165                localname = ref->peer_ref->name;
 166                remotename = ref->name;
 167                tmp = resolve_ref_unsafe(localname, sha, 1, &flag);
 168                if (tmp && flag & REF_ISSYMREF &&
 169                        !prefixcmp(tmp, "refs/heads/"))
 170                        localname = tmp;
 171
 172                /* Both source and destination must be local branches. */
 173                if (!localname || prefixcmp(localname, "refs/heads/"))
 174                        continue;
 175                if (!remotename || prefixcmp(remotename, "refs/heads/"))
 176                        continue;
 177
 178                if (!pretend)
 179                        install_branch_config(BRANCH_CONFIG_VERBOSE,
 180                                localname + 11, transport->remote->name,
 181                                remotename);
 182                else
 183                        printf("Would set upstream of '%s' to '%s' of '%s'\n",
 184                                localname + 11, remotename + 11,
 185                                transport->remote->name);
 186        }
 187}
 188
 189static const char *rsync_url(const char *url)
 190{
 191        return prefixcmp(url, "rsync://") ? skip_prefix(url, "rsync:") : url;
 192}
 193
 194static struct ref *get_refs_via_rsync(struct transport *transport, int for_push)
 195{
 196        struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 197        struct ref dummy = {NULL}, *tail = &dummy;
 198        struct child_process rsync;
 199        const char *args[5];
 200        int temp_dir_len;
 201
 202        if (for_push)
 203                return NULL;
 204
 205        /* copy the refs to the temporary directory */
 206
 207        strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 208        if (!mkdtemp(temp_dir.buf))
 209                die_errno ("Could not make temporary directory");
 210        temp_dir_len = temp_dir.len;
 211
 212        strbuf_addstr(&buf, rsync_url(transport->url));
 213        strbuf_addstr(&buf, "/refs");
 214
 215        memset(&rsync, 0, sizeof(rsync));
 216        rsync.argv = args;
 217        rsync.stdout_to_stderr = 1;
 218        args[0] = "rsync";
 219        args[1] = (transport->verbose > 1) ? "-rv" : "-r";
 220        args[2] = buf.buf;
 221        args[3] = temp_dir.buf;
 222        args[4] = NULL;
 223
 224        if (run_command(&rsync))
 225                die ("Could not run rsync to get refs");
 226
 227        strbuf_reset(&buf);
 228        strbuf_addstr(&buf, rsync_url(transport->url));
 229        strbuf_addstr(&buf, "/packed-refs");
 230
 231        args[2] = buf.buf;
 232
 233        if (run_command(&rsync))
 234                die ("Could not run rsync to get refs");
 235
 236        /* read the copied refs */
 237
 238        strbuf_addstr(&temp_dir, "/refs");
 239        read_loose_refs(&temp_dir, temp_dir_len + 1, &tail);
 240        strbuf_setlen(&temp_dir, temp_dir_len);
 241
 242        tail = &dummy;
 243        strbuf_addstr(&temp_dir, "/packed-refs");
 244        insert_packed_refs(temp_dir.buf, &tail);
 245        strbuf_setlen(&temp_dir, temp_dir_len);
 246
 247        if (remove_dir_recursively(&temp_dir, 0))
 248                warning ("Error removing temporary directory %s.",
 249                                temp_dir.buf);
 250
 251        strbuf_release(&buf);
 252        strbuf_release(&temp_dir);
 253
 254        return dummy.next;
 255}
 256
 257static int fetch_objs_via_rsync(struct transport *transport,
 258                                int nr_objs, struct ref **to_fetch)
 259{
 260        struct strbuf buf = STRBUF_INIT;
 261        struct child_process rsync;
 262        const char *args[8];
 263        int result;
 264
 265        strbuf_addstr(&buf, rsync_url(transport->url));
 266        strbuf_addstr(&buf, "/objects/");
 267
 268        memset(&rsync, 0, sizeof(rsync));
 269        rsync.argv = args;
 270        rsync.stdout_to_stderr = 1;
 271        args[0] = "rsync";
 272        args[1] = (transport->verbose > 1) ? "-rv" : "-r";
 273        args[2] = "--ignore-existing";
 274        args[3] = "--exclude";
 275        args[4] = "info";
 276        args[5] = buf.buf;
 277        args[6] = get_object_directory();
 278        args[7] = NULL;
 279
 280        /* NEEDSWORK: handle one level of alternates */
 281        result = run_command(&rsync);
 282
 283        strbuf_release(&buf);
 284
 285        return result;
 286}
 287
 288static int write_one_ref(const char *name, const unsigned char *sha1,
 289                int flags, void *data)
 290{
 291        struct strbuf *buf = data;
 292        int len = buf->len;
 293        FILE *f;
 294
 295        /* when called via for_each_ref(), flags is non-zero */
 296        if (flags && prefixcmp(name, "refs/heads/") &&
 297                        prefixcmp(name, "refs/tags/"))
 298                return 0;
 299
 300        strbuf_addstr(buf, name);
 301        if (safe_create_leading_directories(buf->buf) ||
 302                        !(f = fopen(buf->buf, "w")) ||
 303                        fprintf(f, "%s\n", sha1_to_hex(sha1)) < 0 ||
 304                        fclose(f))
 305                return error("problems writing temporary file %s", buf->buf);
 306        strbuf_setlen(buf, len);
 307        return 0;
 308}
 309
 310static int write_refs_to_temp_dir(struct strbuf *temp_dir,
 311                int refspec_nr, const char **refspec)
 312{
 313        int i;
 314
 315        for (i = 0; i < refspec_nr; i++) {
 316                unsigned char sha1[20];
 317                char *ref;
 318
 319                if (dwim_ref(refspec[i], strlen(refspec[i]), sha1, &ref) != 1)
 320                        return error("Could not get ref %s", refspec[i]);
 321
 322                if (write_one_ref(ref, sha1, 0, temp_dir)) {
 323                        free(ref);
 324                        return -1;
 325                }
 326                free(ref);
 327        }
 328        return 0;
 329}
 330
 331static int rsync_transport_push(struct transport *transport,
 332                int refspec_nr, const char **refspec, int flags)
 333{
 334        struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 335        int result = 0, i;
 336        struct child_process rsync;
 337        const char *args[10];
 338
 339        if (flags & TRANSPORT_PUSH_MIRROR)
 340                return error("rsync transport does not support mirror mode");
 341
 342        /* first push the objects */
 343
 344        strbuf_addstr(&buf, rsync_url(transport->url));
 345        strbuf_addch(&buf, '/');
 346
 347        memset(&rsync, 0, sizeof(rsync));
 348        rsync.argv = args;
 349        rsync.stdout_to_stderr = 1;
 350        i = 0;
 351        args[i++] = "rsync";
 352        args[i++] = "-a";
 353        if (flags & TRANSPORT_PUSH_DRY_RUN)
 354                args[i++] = "--dry-run";
 355        if (transport->verbose > 1)
 356                args[i++] = "-v";
 357        args[i++] = "--ignore-existing";
 358        args[i++] = "--exclude";
 359        args[i++] = "info";
 360        args[i++] = get_object_directory();
 361        args[i++] = buf.buf;
 362        args[i++] = NULL;
 363
 364        if (run_command(&rsync))
 365                return error("Could not push objects to %s",
 366                                rsync_url(transport->url));
 367
 368        /* copy the refs to the temporary directory; they could be packed. */
 369
 370        strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 371        if (!mkdtemp(temp_dir.buf))
 372                die_errno ("Could not make temporary directory");
 373        strbuf_addch(&temp_dir, '/');
 374
 375        if (flags & TRANSPORT_PUSH_ALL) {
 376                if (for_each_ref(write_one_ref, &temp_dir))
 377                        return -1;
 378        } else if (write_refs_to_temp_dir(&temp_dir, refspec_nr, refspec))
 379                return -1;
 380
 381        i = 2;
 382        if (flags & TRANSPORT_PUSH_DRY_RUN)
 383                args[i++] = "--dry-run";
 384        if (!(flags & TRANSPORT_PUSH_FORCE))
 385                args[i++] = "--ignore-existing";
 386        args[i++] = temp_dir.buf;
 387        args[i++] = rsync_url(transport->url);
 388        args[i++] = NULL;
 389        if (run_command(&rsync))
 390                result = error("Could not push to %s",
 391                                rsync_url(transport->url));
 392
 393        if (remove_dir_recursively(&temp_dir, 0))
 394                warning ("Could not remove temporary directory %s.",
 395                                temp_dir.buf);
 396
 397        strbuf_release(&buf);
 398        strbuf_release(&temp_dir);
 399
 400        return result;
 401}
 402
 403struct bundle_transport_data {
 404        int fd;
 405        struct bundle_header header;
 406};
 407
 408static struct ref *get_refs_from_bundle(struct transport *transport, int for_push)
 409{
 410        struct bundle_transport_data *data = transport->data;
 411        struct ref *result = NULL;
 412        int i;
 413
 414        if (for_push)
 415                return NULL;
 416
 417        if (data->fd > 0)
 418                close(data->fd);
 419        data->fd = read_bundle_header(transport->url, &data->header);
 420        if (data->fd < 0)
 421                die ("Could not read bundle '%s'.", transport->url);
 422        for (i = 0; i < data->header.references.nr; i++) {
 423                struct ref_list_entry *e = data->header.references.list + i;
 424                struct ref *ref = alloc_ref(e->name);
 425                hashcpy(ref->old_sha1, e->sha1);
 426                ref->next = result;
 427                result = ref;
 428        }
 429        return result;
 430}
 431
 432static int fetch_refs_from_bundle(struct transport *transport,
 433                               int nr_heads, struct ref **to_fetch)
 434{
 435        struct bundle_transport_data *data = transport->data;
 436        return unbundle(&data->header, data->fd,
 437                        transport->progress ? BUNDLE_VERBOSE : 0);
 438}
 439
 440static int close_bundle(struct transport *transport)
 441{
 442        struct bundle_transport_data *data = transport->data;
 443        if (data->fd > 0)
 444                close(data->fd);
 445        free(data);
 446        return 0;
 447}
 448
 449struct git_transport_data {
 450        struct git_transport_options options;
 451        struct child_process *conn;
 452        int fd[2];
 453        unsigned got_remote_heads : 1;
 454        struct extra_have_objects extra_have;
 455};
 456
 457static int set_git_option(struct git_transport_options *opts,
 458                          const char *name, const char *value)
 459{
 460        if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 461                opts->uploadpack = value;
 462                return 0;
 463        } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 464                opts->receivepack = value;
 465                return 0;
 466        } else if (!strcmp(name, TRANS_OPT_THIN)) {
 467                opts->thin = !!value;
 468                return 0;
 469        } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
 470                opts->followtags = !!value;
 471                return 0;
 472        } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 473                opts->keep = !!value;
 474                return 0;
 475        } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 476                if (!value)
 477                        opts->depth = 0;
 478                else {
 479                        char *end;
 480                        opts->depth = strtol(value, &end, 0);
 481                        if (*end)
 482                                die("transport: invalid depth option '%s'", value);
 483                }
 484                return 0;
 485        }
 486        return 1;
 487}
 488
 489static int connect_setup(struct transport *transport, int for_push, int verbose)
 490{
 491        struct git_transport_data *data = transport->data;
 492
 493        if (data->conn)
 494                return 0;
 495
 496        data->conn = git_connect(data->fd, transport->url,
 497                                 for_push ? data->options.receivepack :
 498                                 data->options.uploadpack,
 499                                 verbose ? CONNECT_VERBOSE : 0);
 500
 501        return 0;
 502}
 503
 504static struct ref *get_refs_via_connect(struct transport *transport, int for_push)
 505{
 506        struct git_transport_data *data = transport->data;
 507        struct ref *refs;
 508
 509        connect_setup(transport, for_push, 0);
 510        get_remote_heads(data->fd[0], &refs,
 511                         for_push ? REF_NORMAL : 0, &data->extra_have);
 512        data->got_remote_heads = 1;
 513
 514        return refs;
 515}
 516
 517static int fetch_refs_via_pack(struct transport *transport,
 518                               int nr_heads, struct ref **to_fetch)
 519{
 520        struct git_transport_data *data = transport->data;
 521        struct string_list sought = STRING_LIST_INIT_DUP;
 522        const struct ref *refs;
 523        char *dest = xstrdup(transport->url);
 524        struct fetch_pack_args args;
 525        int i;
 526        struct ref *refs_tmp = NULL;
 527
 528        memset(&args, 0, sizeof(args));
 529        args.uploadpack = data->options.uploadpack;
 530        args.keep_pack = data->options.keep;
 531        args.lock_pack = 1;
 532        args.use_thin_pack = data->options.thin;
 533        args.include_tag = data->options.followtags;
 534        args.verbose = (transport->verbose > 1);
 535        args.quiet = (transport->verbose < 0);
 536        args.no_progress = !transport->progress;
 537        args.depth = data->options.depth;
 538
 539        for (i = 0; i < nr_heads; i++)
 540                string_list_append(&sought, to_fetch[i]->name);
 541
 542        if (!data->got_remote_heads) {
 543                connect_setup(transport, 0, 0);
 544                get_remote_heads(data->fd[0], &refs_tmp, 0, NULL);
 545                data->got_remote_heads = 1;
 546        }
 547
 548        refs = fetch_pack(&args, data->fd, data->conn,
 549                          refs_tmp ? refs_tmp : transport->remote_refs,
 550                          dest, &sought, &transport->pack_lockfile);
 551        close(data->fd[0]);
 552        close(data->fd[1]);
 553        if (finish_connect(data->conn))
 554                refs = NULL;
 555        data->conn = NULL;
 556        data->got_remote_heads = 0;
 557
 558        free_refs(refs_tmp);
 559
 560        string_list_clear(&sought, 0);
 561        free(dest);
 562        return (refs ? 0 : -1);
 563}
 564
 565static int push_had_errors(struct ref *ref)
 566{
 567        for (; ref; ref = ref->next) {
 568                switch (ref->status) {
 569                case REF_STATUS_NONE:
 570                case REF_STATUS_UPTODATE:
 571                case REF_STATUS_OK:
 572                        break;
 573                default:
 574                        return 1;
 575                }
 576        }
 577        return 0;
 578}
 579
 580int transport_refs_pushed(struct ref *ref)
 581{
 582        for (; ref; ref = ref->next) {
 583                switch(ref->status) {
 584                case REF_STATUS_NONE:
 585                case REF_STATUS_UPTODATE:
 586                        break;
 587                default:
 588                        return 1;
 589                }
 590        }
 591        return 0;
 592}
 593
 594void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 595{
 596        struct refspec rs;
 597
 598        if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 599                return;
 600
 601        rs.src = ref->name;
 602        rs.dst = NULL;
 603
 604        if (!remote_find_tracking(remote, &rs)) {
 605                if (verbose)
 606                        fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 607                if (ref->deletion) {
 608                        delete_ref(rs.dst, NULL, 0);
 609                } else
 610                        update_ref("update by push", rs.dst,
 611                                        ref->new_sha1, NULL, 0, 0);
 612                free(rs.dst);
 613        }
 614}
 615
 616static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg, int porcelain)
 617{
 618        if (porcelain) {
 619                if (from)
 620                        fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
 621                else
 622                        fprintf(stdout, "%c\t:%s\t", flag, to->name);
 623                if (msg)
 624                        fprintf(stdout, "%s (%s)\n", summary, msg);
 625                else
 626                        fprintf(stdout, "%s\n", summary);
 627        } else {
 628                fprintf(stderr, " %c %-*s ", flag, TRANSPORT_SUMMARY_WIDTH, summary);
 629                if (from)
 630                        fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
 631                else
 632                        fputs(prettify_refname(to->name), stderr);
 633                if (msg) {
 634                        fputs(" (", stderr);
 635                        fputs(msg, stderr);
 636                        fputc(')', stderr);
 637                }
 638                fputc('\n', stderr);
 639        }
 640}
 641
 642static const char *status_abbrev(unsigned char sha1[20])
 643{
 644        return find_unique_abbrev(sha1, DEFAULT_ABBREV);
 645}
 646
 647static void print_ok_ref_status(struct ref *ref, int porcelain)
 648{
 649        if (ref->deletion)
 650                print_ref_status('-', "[deleted]", ref, NULL, NULL, porcelain);
 651        else if (is_null_sha1(ref->old_sha1))
 652                print_ref_status('*',
 653                        (!prefixcmp(ref->name, "refs/tags/") ? "[new tag]" :
 654                        "[new branch]"),
 655                        ref, ref->peer_ref, NULL, porcelain);
 656        else {
 657                char quickref[84];
 658                char type;
 659                const char *msg;
 660
 661                strcpy(quickref, status_abbrev(ref->old_sha1));
 662                if (ref->nonfastforward) {
 663                        strcat(quickref, "...");
 664                        type = '+';
 665                        msg = "forced update";
 666                } else {
 667                        strcat(quickref, "..");
 668                        type = ' ';
 669                        msg = NULL;
 670                }
 671                strcat(quickref, status_abbrev(ref->new_sha1));
 672
 673                print_ref_status(type, quickref, ref, ref->peer_ref, msg, porcelain);
 674        }
 675}
 676
 677static int print_one_push_status(struct ref *ref, const char *dest, int count, int porcelain)
 678{
 679        if (!count)
 680                fprintf(porcelain ? stdout : stderr, "To %s\n", dest);
 681
 682        switch(ref->status) {
 683        case REF_STATUS_NONE:
 684                print_ref_status('X', "[no match]", ref, NULL, NULL, porcelain);
 685                break;
 686        case REF_STATUS_REJECT_NODELETE:
 687                print_ref_status('!', "[rejected]", ref, NULL,
 688                                                 "remote does not support deleting refs", porcelain);
 689                break;
 690        case REF_STATUS_UPTODATE:
 691                print_ref_status('=', "[up to date]", ref,
 692                                                 ref->peer_ref, NULL, porcelain);
 693                break;
 694        case REF_STATUS_REJECT_NONFASTFORWARD:
 695                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 696                                                 "non-fast-forward", porcelain);
 697                break;
 698        case REF_STATUS_REMOTE_REJECT:
 699                print_ref_status('!', "[remote rejected]", ref,
 700                                                 ref->deletion ? NULL : ref->peer_ref,
 701                                                 ref->remote_status, porcelain);
 702                break;
 703        case REF_STATUS_EXPECTING_REPORT:
 704                print_ref_status('!', "[remote failure]", ref,
 705                                                 ref->deletion ? NULL : ref->peer_ref,
 706                                                 "remote failed to report status", porcelain);
 707                break;
 708        case REF_STATUS_OK:
 709                print_ok_ref_status(ref, porcelain);
 710                break;
 711        }
 712
 713        return 1;
 714}
 715
 716void transport_print_push_status(const char *dest, struct ref *refs,
 717                                  int verbose, int porcelain, int *nonfastforward)
 718{
 719        struct ref *ref;
 720        int n = 0;
 721        unsigned char head_sha1[20];
 722        char *head;
 723
 724        head = resolve_refdup("HEAD", head_sha1, 1, NULL);
 725
 726        if (verbose) {
 727                for (ref = refs; ref; ref = ref->next)
 728                        if (ref->status == REF_STATUS_UPTODATE)
 729                                n += print_one_push_status(ref, dest, n, porcelain);
 730        }
 731
 732        for (ref = refs; ref; ref = ref->next)
 733                if (ref->status == REF_STATUS_OK)
 734                        n += print_one_push_status(ref, dest, n, porcelain);
 735
 736        *nonfastforward = 0;
 737        for (ref = refs; ref; ref = ref->next) {
 738                if (ref->status != REF_STATUS_NONE &&
 739                    ref->status != REF_STATUS_UPTODATE &&
 740                    ref->status != REF_STATUS_OK)
 741                        n += print_one_push_status(ref, dest, n, porcelain);
 742                if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD &&
 743                    *nonfastforward != NON_FF_HEAD) {
 744                        if (!strcmp(head, ref->name))
 745                                *nonfastforward = NON_FF_HEAD;
 746                        else
 747                                *nonfastforward = NON_FF_OTHER;
 748                }
 749        }
 750}
 751
 752void transport_verify_remote_names(int nr_heads, const char **heads)
 753{
 754        int i;
 755
 756        for (i = 0; i < nr_heads; i++) {
 757                const char *local = heads[i];
 758                const char *remote = strrchr(heads[i], ':');
 759
 760                if (*local == '+')
 761                        local++;
 762
 763                /* A matching refspec is okay.  */
 764                if (remote == local && remote[1] == '\0')
 765                        continue;
 766
 767                remote = remote ? (remote + 1) : local;
 768                if (check_refname_format(remote,
 769                                REFNAME_ALLOW_ONELEVEL|REFNAME_REFSPEC_PATTERN))
 770                        die("remote part of refspec is not a valid name in %s",
 771                                heads[i]);
 772        }
 773}
 774
 775static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 776{
 777        struct git_transport_data *data = transport->data;
 778        struct send_pack_args args;
 779        int ret;
 780
 781        if (!data->got_remote_heads) {
 782                struct ref *tmp_refs;
 783                connect_setup(transport, 1, 0);
 784
 785                get_remote_heads(data->fd[0], &tmp_refs, REF_NORMAL, NULL);
 786                data->got_remote_heads = 1;
 787        }
 788
 789        memset(&args, 0, sizeof(args));
 790        args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 791        args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 792        args.use_thin_pack = data->options.thin;
 793        args.verbose = (transport->verbose > 0);
 794        args.quiet = (transport->verbose < 0);
 795        args.progress = transport->progress;
 796        args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 797        args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
 798
 799        ret = send_pack(&args, data->fd, data->conn, remote_refs,
 800                        &data->extra_have);
 801
 802        close(data->fd[1]);
 803        close(data->fd[0]);
 804        ret |= finish_connect(data->conn);
 805        data->conn = NULL;
 806        data->got_remote_heads = 0;
 807
 808        return ret;
 809}
 810
 811static int connect_git(struct transport *transport, const char *name,
 812                       const char *executable, int fd[2])
 813{
 814        struct git_transport_data *data = transport->data;
 815        data->conn = git_connect(data->fd, transport->url,
 816                                 executable, 0);
 817        fd[0] = data->fd[0];
 818        fd[1] = data->fd[1];
 819        return 0;
 820}
 821
 822static int disconnect_git(struct transport *transport)
 823{
 824        struct git_transport_data *data = transport->data;
 825        if (data->conn) {
 826                if (data->got_remote_heads)
 827                        packet_flush(data->fd[1]);
 828                close(data->fd[0]);
 829                close(data->fd[1]);
 830                finish_connect(data->conn);
 831        }
 832
 833        free(data);
 834        return 0;
 835}
 836
 837void transport_take_over(struct transport *transport,
 838                         struct child_process *child)
 839{
 840        struct git_transport_data *data;
 841
 842        if (!transport->smart_options)
 843                die("Bug detected: Taking over transport requires non-NULL "
 844                    "smart_options field.");
 845
 846        data = xcalloc(1, sizeof(*data));
 847        data->options = *transport->smart_options;
 848        data->conn = child;
 849        data->fd[0] = data->conn->out;
 850        data->fd[1] = data->conn->in;
 851        data->got_remote_heads = 0;
 852        transport->data = data;
 853
 854        transport->set_option = NULL;
 855        transport->get_refs_list = get_refs_via_connect;
 856        transport->fetch = fetch_refs_via_pack;
 857        transport->push = NULL;
 858        transport->push_refs = git_transport_push;
 859        transport->disconnect = disconnect_git;
 860        transport->smart_options = &(data->options);
 861}
 862
 863static int is_local(const char *url)
 864{
 865        const char *colon = strchr(url, ':');
 866        const char *slash = strchr(url, '/');
 867        return !colon || (slash && slash < colon) ||
 868                has_dos_drive_prefix(url);
 869}
 870
 871static int is_file(const char *url)
 872{
 873        struct stat buf;
 874        if (stat(url, &buf))
 875                return 0;
 876        return S_ISREG(buf.st_mode);
 877}
 878
 879static int external_specification_len(const char *url)
 880{
 881        return strchr(url, ':') - url;
 882}
 883
 884struct transport *transport_get(struct remote *remote, const char *url)
 885{
 886        const char *helper;
 887        struct transport *ret = xcalloc(1, sizeof(*ret));
 888
 889        ret->progress = isatty(2);
 890
 891        if (!remote)
 892                die("No remote provided to transport_get()");
 893
 894        ret->got_remote_refs = 0;
 895        ret->remote = remote;
 896        helper = remote->foreign_vcs;
 897
 898        if (!url && remote->url)
 899                url = remote->url[0];
 900        ret->url = url;
 901
 902        /* maybe it is a foreign URL? */
 903        if (url) {
 904                const char *p = url;
 905
 906                while (is_urlschemechar(p == url, *p))
 907                        p++;
 908                if (!prefixcmp(p, "::"))
 909                        helper = xstrndup(url, p - url);
 910        }
 911
 912        if (helper) {
 913                transport_helper_init(ret, helper);
 914        } else if (!prefixcmp(url, "rsync:")) {
 915                ret->get_refs_list = get_refs_via_rsync;
 916                ret->fetch = fetch_objs_via_rsync;
 917                ret->push = rsync_transport_push;
 918                ret->smart_options = NULL;
 919        } else if (is_local(url) && is_file(url) && is_bundle(url, 1)) {
 920                struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 921                ret->data = data;
 922                ret->get_refs_list = get_refs_from_bundle;
 923                ret->fetch = fetch_refs_from_bundle;
 924                ret->disconnect = close_bundle;
 925                ret->smart_options = NULL;
 926        } else if (!is_url(url)
 927                || !prefixcmp(url, "file://")
 928                || !prefixcmp(url, "git://")
 929                || !prefixcmp(url, "ssh://")
 930                || !prefixcmp(url, "git+ssh://")
 931                || !prefixcmp(url, "ssh+git://")) {
 932                /* These are builtin smart transports. */
 933                struct git_transport_data *data = xcalloc(1, sizeof(*data));
 934                ret->data = data;
 935                ret->set_option = NULL;
 936                ret->get_refs_list = get_refs_via_connect;
 937                ret->fetch = fetch_refs_via_pack;
 938                ret->push_refs = git_transport_push;
 939                ret->connect = connect_git;
 940                ret->disconnect = disconnect_git;
 941                ret->smart_options = &(data->options);
 942
 943                data->conn = NULL;
 944                data->got_remote_heads = 0;
 945        } else {
 946                /* Unknown protocol in URL. Pass to external handler. */
 947                int len = external_specification_len(url);
 948                char *handler = xmalloc(len + 1);
 949                handler[len] = 0;
 950                strncpy(handler, url, len);
 951                transport_helper_init(ret, handler);
 952        }
 953
 954        if (ret->smart_options) {
 955                ret->smart_options->thin = 1;
 956                ret->smart_options->uploadpack = "git-upload-pack";
 957                if (remote->uploadpack)
 958                        ret->smart_options->uploadpack = remote->uploadpack;
 959                ret->smart_options->receivepack = "git-receive-pack";
 960                if (remote->receivepack)
 961                        ret->smart_options->receivepack = remote->receivepack;
 962        }
 963
 964        return ret;
 965}
 966
 967int transport_set_option(struct transport *transport,
 968                         const char *name, const char *value)
 969{
 970        int git_reports = 1, protocol_reports = 1;
 971
 972        if (transport->smart_options)
 973                git_reports = set_git_option(transport->smart_options,
 974                                             name, value);
 975
 976        if (transport->set_option)
 977                protocol_reports = transport->set_option(transport, name,
 978                                                        value);
 979
 980        /* If either report is 0, report 0 (success). */
 981        if (!git_reports || !protocol_reports)
 982                return 0;
 983        /* If either reports -1 (invalid value), report -1. */
 984        if ((git_reports == -1) || (protocol_reports == -1))
 985                return -1;
 986        /* Otherwise if both report unknown, report unknown. */
 987        return 1;
 988}
 989
 990void transport_set_verbosity(struct transport *transport, int verbosity,
 991        int force_progress)
 992{
 993        if (verbosity >= 1)
 994                transport->verbose = verbosity <= 3 ? verbosity : 3;
 995        if (verbosity < 0)
 996                transport->verbose = -1;
 997
 998        /**
 999         * Rules used to determine whether to report progress (processing aborts
1000         * when a rule is satisfied):
1001         *
1002         *   . Report progress, if force_progress is 1 (ie. --progress).
1003         *   . Don't report progress, if force_progress is 0 (ie. --no-progress).
1004         *   . Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
1005         *   . Report progress if isatty(2) is 1.
1006         **/
1007        if (force_progress >= 0)
1008                transport->progress = !!force_progress;
1009        else
1010                transport->progress = verbosity >= 0 && isatty(2);
1011}
1012
1013static void die_with_unpushed_submodules(struct string_list *needs_pushing)
1014{
1015        int i;
1016
1017        fprintf(stderr, "The following submodule paths contain changes that can\n"
1018                        "not be found on any remote:\n");
1019        for (i = 0; i < needs_pushing->nr; i++)
1020                printf("  %s\n", needs_pushing->items[i].string);
1021        fprintf(stderr, "\nPlease try\n\n"
1022                        "       git push --recurse-submodules=on-demand\n\n"
1023                        "or cd to the path and use\n\n"
1024                        "       git push\n\n"
1025                        "to push them to a remote.\n\n");
1026
1027        string_list_clear(needs_pushing, 0);
1028
1029        die("Aborting.");
1030}
1031
1032int transport_push(struct transport *transport,
1033                   int refspec_nr, const char **refspec, int flags,
1034                   int *nonfastforward)
1035{
1036        *nonfastforward = 0;
1037        transport_verify_remote_names(refspec_nr, refspec);
1038
1039        if (transport->push) {
1040                /* Maybe FIXME. But no important transport uses this case. */
1041                if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1042                        die("This transport does not support using --set-upstream");
1043
1044                return transport->push(transport, refspec_nr, refspec, flags);
1045        } else if (transport->push_refs) {
1046                struct ref *remote_refs =
1047                        transport->get_refs_list(transport, 1);
1048                struct ref *local_refs = get_local_heads();
1049                int match_flags = MATCH_REFS_NONE;
1050                int verbose = (transport->verbose > 0);
1051                int quiet = (transport->verbose < 0);
1052                int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
1053                int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
1054                int push_ret, ret, err;
1055
1056                if (flags & TRANSPORT_PUSH_ALL)
1057                        match_flags |= MATCH_REFS_ALL;
1058                if (flags & TRANSPORT_PUSH_MIRROR)
1059                        match_flags |= MATCH_REFS_MIRROR;
1060                if (flags & TRANSPORT_PUSH_PRUNE)
1061                        match_flags |= MATCH_REFS_PRUNE;
1062
1063                if (match_push_refs(local_refs, &remote_refs,
1064                                    refspec_nr, refspec, match_flags)) {
1065                        return -1;
1066                }
1067
1068                set_ref_status_for_push(remote_refs,
1069                        flags & TRANSPORT_PUSH_MIRROR,
1070                        flags & TRANSPORT_PUSH_FORCE);
1071
1072                if ((flags & TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND) && !is_bare_repository()) {
1073                        struct ref *ref = remote_refs;
1074                        for (; ref; ref = ref->next)
1075                                if (!is_null_sha1(ref->new_sha1) &&
1076                                    !push_unpushed_submodules(ref->new_sha1,
1077                                            transport->remote->name))
1078                                    die ("Failed to push all needed submodules!");
1079                }
1080
1081                if ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1082                              TRANSPORT_RECURSE_SUBMODULES_CHECK)) && !is_bare_repository()) {
1083                        struct ref *ref = remote_refs;
1084                        struct string_list needs_pushing;
1085
1086                        memset(&needs_pushing, 0, sizeof(struct string_list));
1087                        needs_pushing.strdup_strings = 1;
1088                        for (; ref; ref = ref->next)
1089                                if (!is_null_sha1(ref->new_sha1) &&
1090                                    find_unpushed_submodules(ref->new_sha1,
1091                                            transport->remote->name, &needs_pushing))
1092                                        die_with_unpushed_submodules(&needs_pushing);
1093                }
1094
1095                push_ret = transport->push_refs(transport, remote_refs, flags);
1096                err = push_had_errors(remote_refs);
1097                ret = push_ret | err;
1098
1099                if (!quiet || err)
1100                        transport_print_push_status(transport->url, remote_refs,
1101                                        verbose | porcelain, porcelain,
1102                                        nonfastforward);
1103
1104                if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1105                        set_upstreams(transport, remote_refs, pretend);
1106
1107                if (!(flags & TRANSPORT_PUSH_DRY_RUN)) {
1108                        struct ref *ref;
1109                        for (ref = remote_refs; ref; ref = ref->next)
1110                                transport_update_tracking_ref(transport->remote, ref, verbose);
1111                }
1112
1113                if (porcelain && !push_ret)
1114                        puts("Done");
1115                else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
1116                        fprintf(stderr, "Everything up-to-date\n");
1117
1118                return ret;
1119        }
1120        return 1;
1121}
1122
1123const struct ref *transport_get_remote_refs(struct transport *transport)
1124{
1125        if (!transport->got_remote_refs) {
1126                transport->remote_refs = transport->get_refs_list(transport, 0);
1127                transport->got_remote_refs = 1;
1128        }
1129
1130        return transport->remote_refs;
1131}
1132
1133int transport_fetch_refs(struct transport *transport, struct ref *refs)
1134{
1135        int rc;
1136        int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
1137        struct ref **heads = NULL;
1138        struct ref *rm;
1139
1140        for (rm = refs; rm; rm = rm->next) {
1141                nr_refs++;
1142                if (rm->peer_ref &&
1143                    !is_null_sha1(rm->old_sha1) &&
1144                    !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
1145                        continue;
1146                ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1147                heads[nr_heads++] = rm;
1148        }
1149
1150        if (!nr_heads) {
1151                /*
1152                 * When deepening of a shallow repository is requested,
1153                 * then local and remote refs are likely to still be equal.
1154                 * Just feed them all to the fetch method in that case.
1155                 * This condition shouldn't be met in a non-deepening fetch
1156                 * (see builtin-fetch.c:quickfetch()).
1157                 */
1158                heads = xmalloc(nr_refs * sizeof(*heads));
1159                for (rm = refs; rm; rm = rm->next)
1160                        heads[nr_heads++] = rm;
1161        }
1162
1163        rc = transport->fetch(transport, nr_heads, heads);
1164
1165        free(heads);
1166        return rc;
1167}
1168
1169void transport_unlock_pack(struct transport *transport)
1170{
1171        if (transport->pack_lockfile) {
1172                unlink_or_warn(transport->pack_lockfile);
1173                free(transport->pack_lockfile);
1174                transport->pack_lockfile = NULL;
1175        }
1176}
1177
1178int transport_connect(struct transport *transport, const char *name,
1179                      const char *exec, int fd[2])
1180{
1181        if (transport->connect)
1182                return transport->connect(transport, name, exec, fd);
1183        else
1184                die("Operation not supported by protocol");
1185}
1186
1187int transport_disconnect(struct transport *transport)
1188{
1189        int ret = 0;
1190        if (transport->disconnect)
1191                ret = transport->disconnect(transport);
1192        free(transport);
1193        return ret;
1194}
1195
1196/*
1197 * Strip username (and password) from a URL and return
1198 * it in a newly allocated string.
1199 */
1200char *transport_anonymize_url(const char *url)
1201{
1202        char *anon_url, *scheme_prefix, *anon_part;
1203        size_t anon_len, prefix_len = 0;
1204
1205        anon_part = strchr(url, '@');
1206        if (is_local(url) || !anon_part)
1207                goto literal_copy;
1208
1209        anon_len = strlen(++anon_part);
1210        scheme_prefix = strstr(url, "://");
1211        if (!scheme_prefix) {
1212                if (!strchr(anon_part, ':'))
1213                        /* cannot be "me@there:/path/name" */
1214                        goto literal_copy;
1215        } else {
1216                const char *cp;
1217                /* make sure scheme is reasonable */
1218                for (cp = url; cp < scheme_prefix; cp++) {
1219                        switch (*cp) {
1220                                /* RFC 1738 2.1 */
1221                        case '+': case '.': case '-':
1222                                break; /* ok */
1223                        default:
1224                                if (isalnum(*cp))
1225                                        break;
1226                                /* it isn't */
1227                                goto literal_copy;
1228                        }
1229                }
1230                /* @ past the first slash does not count */
1231                cp = strchr(scheme_prefix + 3, '/');
1232                if (cp && cp < anon_part)
1233                        goto literal_copy;
1234                prefix_len = scheme_prefix - url + 3;
1235        }
1236        anon_url = xcalloc(1, 1 + prefix_len + anon_len);
1237        memcpy(anon_url, url, prefix_len);
1238        memcpy(anon_url + prefix_len, anon_part, anon_len);
1239        return anon_url;
1240literal_copy:
1241        return xstrdup(url);
1242}
1243
1244struct alternate_refs_data {
1245        alternate_ref_fn *fn;
1246        void *data;
1247};
1248
1249static int refs_from_alternate_cb(struct alternate_object_database *e,
1250                                  void *data)
1251{
1252        char *other;
1253        size_t len;
1254        struct remote *remote;
1255        struct transport *transport;
1256        const struct ref *extra;
1257        struct alternate_refs_data *cb = data;
1258
1259        e->name[-1] = '\0';
1260        other = xstrdup(real_path(e->base));
1261        e->name[-1] = '/';
1262        len = strlen(other);
1263
1264        while (other[len-1] == '/')
1265                other[--len] = '\0';
1266        if (len < 8 || memcmp(other + len - 8, "/objects", 8))
1267                return 0;
1268        /* Is this a git repository with refs? */
1269        memcpy(other + len - 8, "/refs", 6);
1270        if (!is_directory(other))
1271                return 0;
1272        other[len - 8] = '\0';
1273        remote = remote_get(other);
1274        transport = transport_get(remote, other);
1275        for (extra = transport_get_remote_refs(transport);
1276             extra;
1277             extra = extra->next)
1278                cb->fn(extra, cb->data);
1279        transport_disconnect(transport);
1280        free(other);
1281        return 0;
1282}
1283
1284void for_each_alternate_ref(alternate_ref_fn fn, void *data)
1285{
1286        struct alternate_refs_data cb;
1287        cb.fn = fn;
1288        cb.data = data;
1289        foreach_alt_odb(refs_from_alternate_cb, &cb);
1290}