Andrew's git - gitweb.git/blob - builtin-send-pack.c

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