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