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        /* .receivepack = */ "git-receive-pack",
  15};
  16
  17static int feed_object(const unsigned char *sha1, int fd, int negative)
  18{
  19        char buf[42];
  20
  21        if (negative && !has_sha1_file(sha1))
  22                return 1;
  23
  24        memcpy(buf + negative, sha1_to_hex(sha1), 40);
  25        if (negative)
  26                buf[0] = '^';
  27        buf[40 + negative] = '\n';
  28        return write_or_whine(fd, buf, 41 + negative, "send-pack: send refs");
  29}
  30
  31/*
  32 * Make a pack stream and spit it out into file descriptor fd
  33 */
  34static int pack_objects(int fd, struct ref *refs, struct extra_have_objects *extra)
  35{
  36        /*
  37         * The child becomes pack-objects --revs; we feed
  38         * the revision parameters to it via its stdin and
  39         * let its stdout go back to the other end.
  40         */
  41        const char *argv[] = {
  42                "pack-objects",
  43                "--all-progress",
  44                "--revs",
  45                "--stdout",
  46                NULL,
  47                NULL,
  48        };
  49        struct child_process po;
  50        int i;
  51
  52        if (args.use_thin_pack)
  53                argv[4] = "--thin";
  54        memset(&po, 0, sizeof(po));
  55        po.argv = argv;
  56        po.in = -1;
  57        po.out = fd;
  58        po.git_cmd = 1;
  59        if (start_command(&po))
  60                die("git pack-objects failed (%s)", strerror(errno));
  61
  62        /*
  63         * We feed the pack-objects we just spawned with revision
  64         * parameters by writing to the pipe.
  65         */
  66        for (i = 0; i < extra->nr; i++)
  67                if (!feed_object(extra->array[i], po.in, 1))
  68                        break;
  69
  70        while (refs) {
  71                if (!is_null_sha1(refs->old_sha1) &&
  72                    !feed_object(refs->old_sha1, po.in, 1))
  73                        break;
  74                if (!is_null_sha1(refs->new_sha1) &&
  75                    !feed_object(refs->new_sha1, po.in, 0))
  76                        break;
  77                refs = refs->next;
  78        }
  79
  80        close(po.in);
  81        if (finish_command(&po))
  82                return error("pack-objects died with strange error");
  83        return 0;
  84}
  85
  86static struct ref *remote_refs, **remote_tail;
  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
 303static int do_send_pack(int in, int out, struct remote *remote, const char *dest, int nr_refspec, const char **refspec)
 304{
 305        struct ref *ref, *local_refs;
 306        int new_refs;
 307        int ask_for_status_report = 0;
 308        int allow_deleting_refs = 0;
 309        int expect_status_report = 0;
 310        int flags = MATCH_REFS_NONE;
 311        int ret;
 312        struct extra_have_objects extra_have;
 313
 314        memset(&extra_have, 0, sizeof(extra_have));
 315        if (args.send_all)
 316                flags |= MATCH_REFS_ALL;
 317        if (args.send_mirror)
 318                flags |= MATCH_REFS_MIRROR;
 319
 320        /* No funny business with the matcher */
 321        remote_tail = get_remote_heads(in, &remote_refs, 0, NULL, REF_NORMAL,
 322                                       &extra_have);
 323        local_refs = get_local_heads();
 324
 325        /* Does the other end support the reporting? */
 326        if (server_supports("report-status"))
 327                ask_for_status_report = 1;
 328        if (server_supports("delete-refs"))
 329                allow_deleting_refs = 1;
 330
 331        /* match them up */
 332        if (!remote_tail)
 333                remote_tail = &remote_refs;
 334        if (match_refs(local_refs, remote_refs, &remote_tail,
 335                       nr_refspec, refspec, flags)) {
 336                close(out);
 337                return -1;
 338        }
 339
 340        if (!remote_refs) {
 341                fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
 342                        "Perhaps you should specify a branch such as 'master'.\n");
 343                close(out);
 344                return 0;
 345        }
 346
 347        /*
 348         * Finally, tell the other end!
 349         */
 350        new_refs = 0;
 351        for (ref = remote_refs; ref; ref = ref->next) {
 352
 353                if (ref->peer_ref)
 354                        hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
 355                else if (!args.send_mirror)
 356                        continue;
 357
 358                ref->deletion = is_null_sha1(ref->new_sha1);
 359                if (ref->deletion && !allow_deleting_refs) {
 360                        ref->status = REF_STATUS_REJECT_NODELETE;
 361                        continue;
 362                }
 363                if (!ref->deletion &&
 364                    !hashcmp(ref->old_sha1, ref->new_sha1)) {
 365                        ref->status = REF_STATUS_UPTODATE;
 366                        continue;
 367                }
 368
 369                /* This part determines what can overwrite what.
 370                 * The rules are:
 371                 *
 372                 * (0) you can always use --force or +A:B notation to
 373                 *     selectively force individual ref pairs.
 374                 *
 375                 * (1) if the old thing does not exist, it is OK.
 376                 *
 377                 * (2) if you do not have the old thing, you are not allowed
 378                 *     to overwrite it; you would not know what you are losing
 379                 *     otherwise.
 380                 *
 381                 * (3) if both new and old are commit-ish, and new is a
 382                 *     descendant of old, it is OK.
 383                 *
 384                 * (4) regardless of all of the above, removing :B is
 385                 *     always allowed.
 386                 */
 387
 388                ref->nonfastforward =
 389                    !ref->deletion &&
 390                    !is_null_sha1(ref->old_sha1) &&
 391                    (!has_sha1_file(ref->old_sha1)
 392                      || !ref_newer(ref->new_sha1, ref->old_sha1));
 393
 394                if (ref->nonfastforward && !ref->force && !args.force_update) {
 395                        ref->status = REF_STATUS_REJECT_NONFASTFORWARD;
 396                        continue;
 397                }
 398
 399                if (!ref->deletion)
 400                        new_refs++;
 401
 402                if (!args.dry_run) {
 403                        char *old_hex = sha1_to_hex(ref->old_sha1);
 404                        char *new_hex = sha1_to_hex(ref->new_sha1);
 405
 406                        if (ask_for_status_report) {
 407                                packet_write(out, "%s %s %s%c%s",
 408                                        old_hex, new_hex, ref->name, 0,
 409                                        "report-status");
 410                                ask_for_status_report = 0;
 411                                expect_status_report = 1;
 412                        }
 413                        else
 414                                packet_write(out, "%s %s %s",
 415                                        old_hex, new_hex, ref->name);
 416                }
 417                ref->status = expect_status_report ?
 418                        REF_STATUS_EXPECTING_REPORT :
 419                        REF_STATUS_OK;
 420        }
 421
 422        packet_flush(out);
 423        if (new_refs && !args.dry_run) {
 424                if (pack_objects(out, remote_refs, &extra_have) < 0)
 425                        return -1;
 426        }
 427        else
 428                close(out);
 429
 430        if (expect_status_report)
 431                ret = receive_status(in, remote_refs);
 432        else
 433                ret = 0;
 434
 435        print_push_status(dest, remote_refs);
 436
 437        if (!args.dry_run && remote) {
 438                for (ref = remote_refs; ref; ref = ref->next)
 439                        update_tracking_ref(remote, ref);
 440        }
 441
 442        if (!refs_pushed(remote_refs))
 443                fprintf(stderr, "Everything up-to-date\n");
 444        if (ret < 0)
 445                return ret;
 446        for (ref = remote_refs; ref; ref = ref->next) {
 447                switch (ref->status) {
 448                case REF_STATUS_NONE:
 449                case REF_STATUS_UPTODATE:
 450                case REF_STATUS_OK:
 451                        break;
 452                default:
 453                        return -1;
 454                }
 455        }
 456        return 0;
 457}
 458
 459static void verify_remote_names(int nr_heads, const char **heads)
 460{
 461        int i;
 462
 463        for (i = 0; i < nr_heads; i++) {
 464                const char *local = heads[i];
 465                const char *remote = strrchr(heads[i], ':');
 466
 467                if (*local == '+')
 468                        local++;
 469
 470                /* A matching refspec is okay.  */
 471                if (remote == local && remote[1] == '\0')
 472                        continue;
 473
 474                remote = remote ? (remote + 1) : local;
 475                switch (check_ref_format(remote)) {
 476                case 0: /* ok */
 477                case CHECK_REF_FORMAT_ONELEVEL:
 478                        /* ok but a single level -- that is fine for
 479                         * a match pattern.
 480                         */
 481                case CHECK_REF_FORMAT_WILDCARD:
 482                        /* ok but ends with a pattern-match character */
 483                        continue;
 484                }
 485                die("remote part of refspec is not a valid name in %s",
 486                    heads[i]);
 487        }
 488}
 489
 490int cmd_send_pack(int argc, const char **argv, const char *prefix)
 491{
 492        int i, nr_heads = 0;
 493        const char **heads = NULL;
 494        const char *remote_name = NULL;
 495        struct remote *remote = NULL;
 496        const char *dest = NULL;
 497
 498        argv++;
 499        for (i = 1; i < argc; i++, argv++) {
 500                const char *arg = *argv;
 501
 502                if (*arg == '-') {
 503                        if (!prefixcmp(arg, "--receive-pack=")) {
 504                                args.receivepack = arg + 15;
 505                                continue;
 506                        }
 507                        if (!prefixcmp(arg, "--exec=")) {
 508                                args.receivepack = arg + 7;
 509                                continue;
 510                        }
 511                        if (!prefixcmp(arg, "--remote=")) {
 512                                remote_name = arg + 9;
 513                                continue;
 514                        }
 515                        if (!strcmp(arg, "--all")) {
 516                                args.send_all = 1;
 517                                continue;
 518                        }
 519                        if (!strcmp(arg, "--dry-run")) {
 520                                args.dry_run = 1;
 521                                continue;
 522                        }
 523                        if (!strcmp(arg, "--mirror")) {
 524                                args.send_mirror = 1;
 525                                continue;
 526                        }
 527                        if (!strcmp(arg, "--force")) {
 528                                args.force_update = 1;
 529                                continue;
 530                        }
 531                        if (!strcmp(arg, "--verbose")) {
 532                                args.verbose = 1;
 533                                continue;
 534                        }
 535                        if (!strcmp(arg, "--thin")) {
 536                                args.use_thin_pack = 1;
 537                                continue;
 538                        }
 539                        usage(send_pack_usage);
 540                }
 541                if (!dest) {
 542                        dest = arg;
 543                        continue;
 544                }
 545                heads = (const char **) argv;
 546                nr_heads = argc - i;
 547                break;
 548        }
 549        if (!dest)
 550                usage(send_pack_usage);
 551        /*
 552         * --all and --mirror are incompatible; neither makes sense
 553         * with any refspecs.
 554         */
 555        if ((heads && (args.send_all || args.send_mirror)) ||
 556                                        (args.send_all && args.send_mirror))
 557                usage(send_pack_usage);
 558
 559        if (remote_name) {
 560                remote = remote_get(remote_name);
 561                if (!remote_has_url(remote, dest)) {
 562                        die("Destination %s is not a uri for %s",
 563                            dest, remote_name);
 564                }
 565        }
 566
 567        return send_pack(&args, dest, remote, nr_heads, heads);
 568}
 569
 570int send_pack(struct send_pack_args *my_args,
 571              const char *dest, struct remote *remote,
 572              int nr_heads, const char **heads)
 573{
 574        int fd[2], ret;
 575        struct child_process *conn;
 576
 577        memcpy(&args, my_args, sizeof(args));
 578
 579        verify_remote_names(nr_heads, heads);
 580
 581        conn = git_connect(fd, dest, args.receivepack, args.verbose ? CONNECT_VERBOSE : 0);
 582        ret = do_send_pack(fd[0], fd[1], remote, dest, nr_heads, heads);
 583        close(fd[0]);
 584        /* do_send_pack always closes fd[1] */
 585        ret |= finish_connect(conn);
 586        return !!ret;
 587}