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