Andrew's git / gitweb.git / builtin-send-pack.c
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builtin-send-pack.con commit Add contrib/rerere-train script (c11c7a5)
   1#include "cache.h"
   2#include "commit.h"
   3#include "tag.h"
   4#include "refs.h"
   5#include "pkt-line.h"
   6#include "run-command.h"
   7#include "remote.h"
   8#include "send-pack.h"
   9
  10static const char send_pack_usage[] =
  11"git send-pack [--all | --mirror] [--dry-run] [--force] [--receive-pack=<git-receive-pack>] [--verbose] [--thin] [<host>:]<directory> [<ref>...]\n"
  12"  --all and explicit <ref> specification are mutually exclusive.";
  13
  14static struct send_pack_args args = {
  15        /* .receivepack = */ "git-receive-pack",
  16};
  17
  18/*
  19 * Make a pack stream and spit it out into file descriptor fd
  20 */
  21static int pack_objects(int fd, struct ref *refs, struct extra_have_objects *extra)
  22{
  23        /*
  24         * The child becomes pack-objects --revs; we feed
  25         * the revision parameters to it via its stdin and
  26         * let its stdout go back to the other end.
  27         */
  28        const char *argv[] = {
  29                "pack-objects",
  30                "--all-progress",
  31                "--revs",
  32                "--stdout",
  33                NULL,
  34                NULL,
  35        };
  36        struct child_process po;
  37        int i;
  38        char buf[42];
  39
  40        if (args.use_thin_pack)
  41                argv[4] = "--thin";
  42        memset(&po, 0, sizeof(po));
  43        po.argv = argv;
  44        po.in = -1;
  45        po.out = fd;
  46        po.git_cmd = 1;
  47        if (start_command(&po))
  48                die("git pack-objects failed (%s)", strerror(errno));
  49
  50        /*
  51         * We feed the pack-objects we just spawned with revision
  52         * parameters by writing to the pipe.
  53         */
  54        for (i = 0; i < extra->nr; i++) {
  55                memcpy(buf + 1, sha1_to_hex(&extra->array[i][0]), 40);
  56                buf[0] = '^';
  57                buf[41] = '\n';
  58                if (!write_or_whine(po.in, buf, 42, "send-pack: send refs"))
  59                        break;
  60        }
  61
  62        while (refs) {
  63                if (!is_null_sha1(refs->old_sha1) &&
  64                    has_sha1_file(refs->old_sha1)) {
  65                        memcpy(buf + 1, sha1_to_hex(refs->old_sha1), 40);
  66                        buf[0] = '^';
  67                        buf[41] = '\n';
  68                        if (!write_or_whine(po.in, buf, 42,
  69                                                "send-pack: send refs"))
  70                                break;
  71                }
  72                if (!is_null_sha1(refs->new_sha1)) {
  73                        memcpy(buf, sha1_to_hex(refs->new_sha1), 40);
  74                        buf[40] = '\n';
  75                        if (!write_or_whine(po.in, buf, 41,
  76                                                "send-pack: send refs"))
  77                                break;
  78                }
  79                refs = refs->next;
  80        }
  81
  82        close(po.in);
  83        if (finish_command(&po))
  84                return error("pack-objects died with strange error");
  85        return 0;
  86}
  87
  88static void unmark_and_free(struct commit_list *list, unsigned int mark)
  89{
  90        while (list) {
  91                struct commit_list *temp = list;
  92                temp->item->object.flags &= ~mark;
  93                list = temp->next;
  94                free(temp);
  95        }
  96}
  97
  98static int ref_newer(const unsigned char *new_sha1,
  99                     const unsigned char *old_sha1)
 100{
 101        struct object *o;
 102        struct commit *old, *new;
 103        struct commit_list *list, *used;
 104        int found = 0;
 105
 106        /* Both new and old must be commit-ish and new is descendant of
 107         * old.  Otherwise we require --force.
 108         */
 109        o = deref_tag(parse_object(old_sha1), NULL, 0);
 110        if (!o || o->type != OBJ_COMMIT)
 111                return 0;
 112        old = (struct commit *) o;
 113
 114        o = deref_tag(parse_object(new_sha1), NULL, 0);
 115        if (!o || o->type != OBJ_COMMIT)
 116                return 0;
 117        new = (struct commit *) o;
 118
 119        if (parse_commit(new) < 0)
 120                return 0;
 121
 122        used = list = NULL;
 123        commit_list_insert(new, &list);
 124        while (list) {
 125                new = pop_most_recent_commit(&list, 1);
 126                commit_list_insert(new, &used);
 127                if (new == old) {
 128                        found = 1;
 129                        break;
 130                }
 131        }
 132        unmark_and_free(list, 1);
 133        unmark_and_free(used, 1);
 134        return found;
 135}
 136
 137static struct ref *local_refs, **local_tail;
 138static struct ref *remote_refs, **remote_tail;
 139
 140static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 141{
 142        struct ref *ref;
 143        int len = strlen(refname) + 1;
 144        ref = xcalloc(1, sizeof(*ref) + len);
 145        hashcpy(ref->new_sha1, sha1);
 146        memcpy(ref->name, refname, len);
 147        *local_tail = ref;
 148        local_tail = &ref->next;
 149        return 0;
 150}
 151
 152static void get_local_heads(void)
 153{
 154        local_tail = &local_refs;
 155        for_each_ref(one_local_ref, NULL);
 156}
 157
 158static int receive_status(int in, struct ref *refs)
 159{
 160        struct ref *hint;
 161        char line[1000];
 162        int ret = 0;
 163        int len = packet_read_line(in, line, sizeof(line));
 164        if (len < 10 || memcmp(line, "unpack ", 7))
 165                return error("did not receive remote status");
 166        if (memcmp(line, "unpack ok\n", 10)) {
 167                char *p = line + strlen(line) - 1;
 168                if (*p == '\n')
 169                        *p = '\0';
 170                error("unpack failed: %s", line + 7);
 171                ret = -1;
 172        }
 173        hint = NULL;
 174        while (1) {
 175                char *refname;
 176                char *msg;
 177                len = packet_read_line(in, line, sizeof(line));
 178                if (!len)
 179                        break;
 180                if (len < 3 ||
 181                    (memcmp(line, "ok ", 3) && memcmp(line, "ng ", 3))) {
 182                        fprintf(stderr, "protocol error: %s\n", line);
 183                        ret = -1;
 184                        break;
 185                }
 186
 187                line[strlen(line)-1] = '\0';
 188                refname = line + 3;
 189                msg = strchr(refname, ' ');
 190                if (msg)
 191                        *msg++ = '\0';
 192
 193                /* first try searching at our hint, falling back to all refs */
 194                if (hint)
 195                        hint = find_ref_by_name(hint, refname);
 196                if (!hint)
 197                        hint = find_ref_by_name(refs, refname);
 198                if (!hint) {
 199                        warning("remote reported status on unknown ref: %s",
 200                                        refname);
 201                        continue;
 202                }
 203                if (hint->status != REF_STATUS_EXPECTING_REPORT) {
 204                        warning("remote reported status on unexpected ref: %s",
 205                                        refname);
 206                        continue;
 207                }
 208
 209                if (line[0] == 'o' && line[1] == 'k')
 210                        hint->status = REF_STATUS_OK;
 211                else {
 212                        hint->status = REF_STATUS_REMOTE_REJECT;
 213                        ret = -1;
 214                }
 215                if (msg)
 216                        hint->remote_status = xstrdup(msg);
 217                /* start our next search from the next ref */
 218                hint = hint->next;
 219        }
 220        return ret;
 221}
 222
 223static void update_tracking_ref(struct remote *remote, struct ref *ref)
 224{
 225        struct refspec rs;
 226
 227        if (ref->status != REF_STATUS_OK)
 228                return;
 229
 230        rs.src = ref->name;
 231        rs.dst = NULL;
 232
 233        if (!remote_find_tracking(remote, &rs)) {
 234                if (args.verbose)
 235                        fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 236                if (ref->deletion) {
 237                        delete_ref(rs.dst, NULL);
 238                } else
 239                        update_ref("update by push", rs.dst,
 240                                        ref->new_sha1, NULL, 0, 0);
 241                free(rs.dst);
 242        }
 243}
 244
 245static const char *prettify_ref(const struct ref *ref)
 246{
 247        const char *name = ref->name;
 248        return name + (
 249                !prefixcmp(name, "refs/heads/") ? 11 :
 250                !prefixcmp(name, "refs/tags/") ? 10 :
 251                !prefixcmp(name, "refs/remotes/") ? 13 :
 252                0);
 253}
 254
 255#define SUMMARY_WIDTH (2 * DEFAULT_ABBREV + 3)
 256
 257static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg)
 258{
 259        fprintf(stderr, " %c %-*s ", flag, SUMMARY_WIDTH, summary);
 260        if (from)
 261                fprintf(stderr, "%s -> %s", prettify_ref(from), prettify_ref(to));
 262        else
 263                fputs(prettify_ref(to), stderr);
 264        if (msg) {
 265                fputs(" (", stderr);
 266                fputs(msg, stderr);
 267                fputc(')', stderr);
 268        }
 269        fputc('\n', stderr);
 270}
 271
 272static const char *status_abbrev(unsigned char sha1[20])
 273{
 274        return find_unique_abbrev(sha1, DEFAULT_ABBREV);
 275}
 276
 277static void print_ok_ref_status(struct ref *ref)
 278{
 279        if (ref->deletion)
 280                print_ref_status('-', "[deleted]", ref, NULL, NULL);
 281        else if (is_null_sha1(ref->old_sha1))
 282                print_ref_status('*',
 283                        (!prefixcmp(ref->name, "refs/tags/") ? "[new tag]" :
 284                          "[new branch]"),
 285                        ref, ref->peer_ref, NULL);
 286        else {
 287                char quickref[84];
 288                char type;
 289                const char *msg;
 290
 291                strcpy(quickref, status_abbrev(ref->old_sha1));
 292                if (ref->nonfastforward) {
 293                        strcat(quickref, "...");
 294                        type = '+';
 295                        msg = "forced update";
 296                } else {
 297                        strcat(quickref, "..");
 298                        type = ' ';
 299                        msg = NULL;
 300                }
 301                strcat(quickref, status_abbrev(ref->new_sha1));
 302
 303                print_ref_status(type, quickref, ref, ref->peer_ref, msg);
 304        }
 305}
 306
 307static int print_one_push_status(struct ref *ref, const char *dest, int count)
 308{
 309        if (!count)
 310                fprintf(stderr, "To %s\n", dest);
 311
 312        switch(ref->status) {
 313        case REF_STATUS_NONE:
 314                print_ref_status('X', "[no match]", ref, NULL, NULL);
 315                break;
 316        case REF_STATUS_REJECT_NODELETE:
 317                print_ref_status('!', "[rejected]", ref, NULL,
 318                                "remote does not support deleting refs");
 319                break;
 320        case REF_STATUS_UPTODATE:
 321                print_ref_status('=', "[up to date]", ref,
 322                                ref->peer_ref, NULL);
 323                break;
 324        case REF_STATUS_REJECT_NONFASTFORWARD:
 325                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 326                                "non-fast forward");
 327                break;
 328        case REF_STATUS_REMOTE_REJECT:
 329                print_ref_status('!', "[remote rejected]", ref,
 330                                ref->deletion ? NULL : ref->peer_ref,
 331                                ref->remote_status);
 332                break;
 333        case REF_STATUS_EXPECTING_REPORT:
 334                print_ref_status('!', "[remote failure]", ref,
 335                                ref->deletion ? NULL : ref->peer_ref,
 336                                "remote failed to report status");
 337                break;
 338        case REF_STATUS_OK:
 339                print_ok_ref_status(ref);
 340                break;
 341        }
 342
 343        return 1;
 344}
 345
 346static void print_push_status(const char *dest, struct ref *refs)
 347{
 348        struct ref *ref;
 349        int n = 0;
 350
 351        if (args.verbose) {
 352                for (ref = refs; ref; ref = ref->next)
 353                        if (ref->status == REF_STATUS_UPTODATE)
 354                                n += print_one_push_status(ref, dest, n);
 355        }
 356
 357        for (ref = refs; ref; ref = ref->next)
 358                if (ref->status == REF_STATUS_OK)
 359                        n += print_one_push_status(ref, dest, n);
 360
 361        for (ref = refs; ref; ref = ref->next) {
 362                if (ref->status != REF_STATUS_NONE &&
 363                    ref->status != REF_STATUS_UPTODATE &&
 364                    ref->status != REF_STATUS_OK)
 365                        n += print_one_push_status(ref, dest, n);
 366        }
 367}
 368
 369static int refs_pushed(struct ref *ref)
 370{
 371        for (; ref; ref = ref->next) {
 372                switch(ref->status) {
 373                case REF_STATUS_NONE:
 374                case REF_STATUS_UPTODATE:
 375                        break;
 376                default:
 377                        return 1;
 378                }
 379        }
 380        return 0;
 381}
 382
 383static int do_send_pack(int in, int out, struct remote *remote, const char *dest, int nr_refspec, const char **refspec)
 384{
 385        struct ref *ref;
 386        int new_refs;
 387        int ask_for_status_report = 0;
 388        int allow_deleting_refs = 0;
 389        int expect_status_report = 0;
 390        int flags = MATCH_REFS_NONE;
 391        int ret;
 392        struct extra_have_objects extra_have;
 393
 394        memset(&extra_have, 0, sizeof(extra_have));
 395        if (args.send_all)
 396                flags |= MATCH_REFS_ALL;
 397        if (args.send_mirror)
 398                flags |= MATCH_REFS_MIRROR;
 399
 400        /* No funny business with the matcher */
 401        remote_tail = get_remote_heads(in, &remote_refs, 0, NULL, REF_NORMAL,
 402                                       &extra_have);
 403        get_local_heads();
 404
 405        /* Does the other end support the reporting? */
 406        if (server_supports("report-status"))
 407                ask_for_status_report = 1;
 408        if (server_supports("delete-refs"))
 409                allow_deleting_refs = 1;
 410
 411        /* match them up */
 412        if (!remote_tail)
 413                remote_tail = &remote_refs;
 414        if (match_refs(local_refs, remote_refs, &remote_tail,
 415                       nr_refspec, refspec, flags)) {
 416                close(out);
 417                return -1;
 418        }
 419
 420        if (!remote_refs) {
 421                fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
 422                        "Perhaps you should specify a branch such as 'master'.\n");
 423                close(out);
 424                return 0;
 425        }
 426
 427        /*
 428         * Finally, tell the other end!
 429         */
 430        new_refs = 0;
 431        for (ref = remote_refs; ref; ref = ref->next) {
 432                const unsigned char *new_sha1;
 433
 434                if (!ref->peer_ref) {
 435                        if (!args.send_mirror)
 436                                continue;
 437                        new_sha1 = null_sha1;
 438                }
 439                else
 440                        new_sha1 = ref->peer_ref->new_sha1;
 441
 442
 443                ref->deletion = is_null_sha1(new_sha1);
 444                if (ref->deletion && !allow_deleting_refs) {
 445                        ref->status = REF_STATUS_REJECT_NODELETE;
 446                        continue;
 447                }
 448                if (!ref->deletion &&
 449                    !hashcmp(ref->old_sha1, new_sha1)) {
 450                        ref->status = REF_STATUS_UPTODATE;
 451                        continue;
 452                }
 453
 454                /* This part determines what can overwrite what.
 455                 * The rules are:
 456                 *
 457                 * (0) you can always use --force or +A:B notation to
 458                 *     selectively force individual ref pairs.
 459                 *
 460                 * (1) if the old thing does not exist, it is OK.
 461                 *
 462                 * (2) if you do not have the old thing, you are not allowed
 463                 *     to overwrite it; you would not know what you are losing
 464                 *     otherwise.
 465                 *
 466                 * (3) if both new and old are commit-ish, and new is a
 467                 *     descendant of old, it is OK.
 468                 *
 469                 * (4) regardless of all of the above, removing :B is
 470                 *     always allowed.
 471                 */
 472
 473                ref->nonfastforward =
 474                    !ref->deletion &&
 475                    !is_null_sha1(ref->old_sha1) &&
 476                    (!has_sha1_file(ref->old_sha1)
 477                      || !ref_newer(new_sha1, ref->old_sha1));
 478
 479                if (ref->nonfastforward && !ref->force && !args.force_update) {
 480                        ref->status = REF_STATUS_REJECT_NONFASTFORWARD;
 481                        continue;
 482                }
 483
 484                hashcpy(ref->new_sha1, new_sha1);
 485                if (!ref->deletion)
 486                        new_refs++;
 487
 488                if (!args.dry_run) {
 489                        char *old_hex = sha1_to_hex(ref->old_sha1);
 490                        char *new_hex = sha1_to_hex(ref->new_sha1);
 491
 492                        if (ask_for_status_report) {
 493                                packet_write(out, "%s %s %s%c%s",
 494                                        old_hex, new_hex, ref->name, 0,
 495                                        "report-status");
 496                                ask_for_status_report = 0;
 497                                expect_status_report = 1;
 498                        }
 499                        else
 500                                packet_write(out, "%s %s %s",
 501                                        old_hex, new_hex, ref->name);
 502                }
 503                ref->status = expect_status_report ?
 504                        REF_STATUS_EXPECTING_REPORT :
 505                        REF_STATUS_OK;
 506        }
 507
 508        packet_flush(out);
 509        if (new_refs && !args.dry_run) {
 510                if (pack_objects(out, remote_refs, &extra_have) < 0)
 511                        return -1;
 512        }
 513        else
 514                close(out);
 515
 516        if (expect_status_report)
 517                ret = receive_status(in, remote_refs);
 518        else
 519                ret = 0;
 520
 521        print_push_status(dest, remote_refs);
 522
 523        if (!args.dry_run && remote) {
 524                for (ref = remote_refs; ref; ref = ref->next)
 525                        update_tracking_ref(remote, ref);
 526        }
 527
 528        if (!refs_pushed(remote_refs))
 529                fprintf(stderr, "Everything up-to-date\n");
 530        if (ret < 0)
 531                return ret;
 532        for (ref = remote_refs; ref; ref = ref->next) {
 533                switch (ref->status) {
 534                case REF_STATUS_NONE:
 535                case REF_STATUS_UPTODATE:
 536                case REF_STATUS_OK:
 537                        break;
 538                default:
 539                        return -1;
 540                }
 541        }
 542        return 0;
 543}
 544
 545static void verify_remote_names(int nr_heads, const char **heads)
 546{
 547        int i;
 548
 549        for (i = 0; i < nr_heads; i++) {
 550                const char *local = heads[i];
 551                const char *remote = strrchr(heads[i], ':');
 552
 553                if (*local == '+')
 554                        local++;
 555
 556                /* A matching refspec is okay.  */
 557                if (remote == local && remote[1] == '\0')
 558                        continue;
 559
 560                remote = remote ? (remote + 1) : local;
 561                switch (check_ref_format(remote)) {
 562                case 0: /* ok */
 563                case CHECK_REF_FORMAT_ONELEVEL:
 564                        /* ok but a single level -- that is fine for
 565                         * a match pattern.
 566                         */
 567                case CHECK_REF_FORMAT_WILDCARD:
 568                        /* ok but ends with a pattern-match character */
 569                        continue;
 570                }
 571                die("remote part of refspec is not a valid name in %s",
 572                    heads[i]);
 573        }
 574}
 575
 576int cmd_send_pack(int argc, const char **argv, const char *prefix)
 577{
 578        int i, nr_heads = 0;
 579        const char **heads = NULL;
 580        const char *remote_name = NULL;
 581        struct remote *remote = NULL;
 582        const char *dest = NULL;
 583
 584        argv++;
 585        for (i = 1; i < argc; i++, argv++) {
 586                const char *arg = *argv;
 587
 588                if (*arg == '-') {
 589                        if (!prefixcmp(arg, "--receive-pack=")) {
 590                                args.receivepack = arg + 15;
 591                                continue;
 592                        }
 593                        if (!prefixcmp(arg, "--exec=")) {
 594                                args.receivepack = arg + 7;
 595                                continue;
 596                        }
 597                        if (!prefixcmp(arg, "--remote=")) {
 598                                remote_name = arg + 9;
 599                                continue;
 600                        }
 601                        if (!strcmp(arg, "--all")) {
 602                                args.send_all = 1;
 603                                continue;
 604                        }
 605                        if (!strcmp(arg, "--dry-run")) {
 606                                args.dry_run = 1;
 607                                continue;
 608                        }
 609                        if (!strcmp(arg, "--mirror")) {
 610                                args.send_mirror = 1;
 611                                continue;
 612                        }
 613                        if (!strcmp(arg, "--force")) {
 614                                args.force_update = 1;
 615                                continue;
 616                        }
 617                        if (!strcmp(arg, "--verbose")) {
 618                                args.verbose = 1;
 619                                continue;
 620                        }
 621                        if (!strcmp(arg, "--thin")) {
 622                                args.use_thin_pack = 1;
 623                                continue;
 624                        }
 625                        usage(send_pack_usage);
 626                }
 627                if (!dest) {
 628                        dest = arg;
 629                        continue;
 630                }
 631                heads = (const char **) argv;
 632                nr_heads = argc - i;
 633                break;
 634        }
 635        if (!dest)
 636                usage(send_pack_usage);
 637        /*
 638         * --all and --mirror are incompatible; neither makes sense
 639         * with any refspecs.
 640         */
 641        if ((heads && (args.send_all || args.send_mirror)) ||
 642                                        (args.send_all && args.send_mirror))
 643                usage(send_pack_usage);
 644
 645        if (remote_name) {
 646                remote = remote_get(remote_name);
 647                if (!remote_has_url(remote, dest)) {
 648                        die("Destination %s is not a uri for %s",
 649                            dest, remote_name);
 650                }
 651        }
 652
 653        return send_pack(&args, dest, remote, nr_heads, heads);
 654}
 655
 656int send_pack(struct send_pack_args *my_args,
 657              const char *dest, struct remote *remote,
 658              int nr_heads, const char **heads)
 659{
 660        int fd[2], ret;
 661        struct child_process *conn;
 662
 663        memcpy(&args, my_args, sizeof(args));
 664
 665        verify_remote_names(nr_heads, heads);
 666
 667        conn = git_connect(fd, dest, args.receivepack, args.verbose ? CONNECT_VERBOSE : 0);
 668        ret = do_send_pack(fd[0], fd[1], remote, dest, nr_heads, heads);
 669        close(fd[0]);
 670        /* do_send_pack always closes fd[1] */
 671        ret |= finish_connect(conn);
 672        return !!ret;
 673}