bundle.con commit Merge branch 'mz/empty-rebase-test' (570f293)
   1#include "cache.h"
   2#include "bundle.h"
   3#include "object.h"
   4#include "commit.h"
   5#include "diff.h"
   6#include "revision.h"
   7#include "list-objects.h"
   8#include "run-command.h"
   9#include "refs.h"
  10
  11static const char bundle_signature[] = "# v2 git bundle\n";
  12
  13static void add_to_ref_list(const unsigned char *sha1, const char *name,
  14                struct ref_list *list)
  15{
  16        if (list->nr + 1 >= list->alloc) {
  17                list->alloc = alloc_nr(list->nr + 1);
  18                list->list = xrealloc(list->list,
  19                                list->alloc * sizeof(list->list[0]));
  20        }
  21        memcpy(list->list[list->nr].sha1, sha1, 20);
  22        list->list[list->nr].name = xstrdup(name);
  23        list->nr++;
  24}
  25
  26static int parse_bundle_header(int fd, struct bundle_header *header,
  27                               const char *report_path)
  28{
  29        struct strbuf buf = STRBUF_INIT;
  30        int status = 0;
  31
  32        /* The bundle header begins with the signature */
  33        if (strbuf_getwholeline_fd(&buf, fd, '\n') ||
  34            strcmp(buf.buf, bundle_signature)) {
  35                if (report_path)
  36                        error(_("'%s' does not look like a v2 bundle file"),
  37                              report_path);
  38                status = -1;
  39                goto abort;
  40        }
  41
  42        /* The bundle header ends with an empty line */
  43        while (!strbuf_getwholeline_fd(&buf, fd, '\n') &&
  44               buf.len && buf.buf[0] != '\n') {
  45                unsigned char sha1[20];
  46                int is_prereq = 0;
  47
  48                if (*buf.buf == '-') {
  49                        is_prereq = 1;
  50                        strbuf_remove(&buf, 0, 1);
  51                }
  52                strbuf_rtrim(&buf);
  53
  54                /*
  55                 * Tip lines have object name, SP, and refname.
  56                 * Prerequisites have object name that is optionally
  57                 * followed by SP and subject line.
  58                 */
  59                if (get_sha1_hex(buf.buf, sha1) ||
  60                    (40 <= buf.len && !isspace(buf.buf[40])) ||
  61                    (!is_prereq && buf.len <= 40)) {
  62                        if (report_path)
  63                                error(_("unrecognized header: %s%s (%d)"),
  64                                      (is_prereq ? "-" : ""), buf.buf, (int)buf.len);
  65                        status = -1;
  66                        break;
  67                } else {
  68                        if (is_prereq)
  69                                add_to_ref_list(sha1, "", &header->prerequisites);
  70                        else
  71                                add_to_ref_list(sha1, buf.buf + 41, &header->references);
  72                }
  73        }
  74
  75 abort:
  76        if (status) {
  77                close(fd);
  78                fd = -1;
  79        }
  80        strbuf_release(&buf);
  81        return fd;
  82}
  83
  84int read_bundle_header(const char *path, struct bundle_header *header)
  85{
  86        int fd = open(path, O_RDONLY);
  87
  88        if (fd < 0)
  89                return error(_("could not open '%s'"), path);
  90        return parse_bundle_header(fd, header, path);
  91}
  92
  93int is_bundle(const char *path, int quiet)
  94{
  95        struct bundle_header header;
  96        int fd = open(path, O_RDONLY);
  97
  98        if (fd < 0)
  99                return 0;
 100        memset(&header, 0, sizeof(header));
 101        fd = parse_bundle_header(fd, &header, quiet ? NULL : path);
 102        if (fd >= 0)
 103                close(fd);
 104        return (fd >= 0);
 105}
 106
 107static int list_refs(struct ref_list *r, int argc, const char **argv)
 108{
 109        int i;
 110
 111        for (i = 0; i < r->nr; i++) {
 112                if (argc > 1) {
 113                        int j;
 114                        for (j = 1; j < argc; j++)
 115                                if (!strcmp(r->list[i].name, argv[j]))
 116                                        break;
 117                        if (j == argc)
 118                                continue;
 119                }
 120                printf("%s %s\n", sha1_to_hex(r->list[i].sha1),
 121                                r->list[i].name);
 122        }
 123        return 0;
 124}
 125
 126#define PREREQ_MARK (1u<<16)
 127
 128int verify_bundle(struct bundle_header *header, int verbose)
 129{
 130        /*
 131         * Do fast check, then if any prereqs are missing then go line by line
 132         * to be verbose about the errors
 133         */
 134        struct ref_list *p = &header->prerequisites;
 135        struct rev_info revs;
 136        const char *argv[] = {NULL, "--all", NULL};
 137        struct object_array refs;
 138        struct commit *commit;
 139        int i, ret = 0, req_nr;
 140        const char *message = _("Repository lacks these prerequisite commits:");
 141
 142        init_revisions(&revs, NULL);
 143        for (i = 0; i < p->nr; i++) {
 144                struct ref_list_entry *e = p->list + i;
 145                struct object *o = parse_object(e->sha1);
 146                if (o) {
 147                        o->flags |= PREREQ_MARK;
 148                        add_pending_object(&revs, o, e->name);
 149                        continue;
 150                }
 151                if (++ret == 1)
 152                        error("%s", message);
 153                error("%s %s", sha1_to_hex(e->sha1), e->name);
 154        }
 155        if (revs.pending.nr != p->nr)
 156                return ret;
 157        req_nr = revs.pending.nr;
 158        setup_revisions(2, argv, &revs, NULL);
 159
 160        refs = revs.pending;
 161        revs.leak_pending = 1;
 162
 163        if (prepare_revision_walk(&revs))
 164                die(_("revision walk setup failed"));
 165
 166        i = req_nr;
 167        while (i && (commit = get_revision(&revs)))
 168                if (commit->object.flags & PREREQ_MARK)
 169                        i--;
 170
 171        for (i = 0; i < req_nr; i++)
 172                if (!(refs.objects[i].item->flags & SHOWN)) {
 173                        if (++ret == 1)
 174                                error("%s", message);
 175                        error("%s %s", sha1_to_hex(refs.objects[i].item->sha1),
 176                                refs.objects[i].name);
 177                }
 178
 179        clear_commit_marks_for_object_array(&refs, ALL_REV_FLAGS);
 180        free(refs.objects);
 181
 182        if (verbose) {
 183                struct ref_list *r;
 184
 185                r = &header->references;
 186                printf_ln(Q_("The bundle contains %d ref",
 187                             "The bundle contains %d refs",
 188                             r->nr),
 189                          r->nr);
 190                list_refs(r, 0, NULL);
 191                if (!r->nr) {
 192                        printf_ln(_("The bundle records a complete history."));
 193                } else {
 194                        r = &header->prerequisites;
 195                        printf_ln(Q_("The bundle requires this ref",
 196                                     "The bundle requires these %d refs",
 197                                     r->nr),
 198                                  r->nr);
 199                        list_refs(r, 0, NULL);
 200                }
 201        }
 202        return ret;
 203}
 204
 205int list_bundle_refs(struct bundle_header *header, int argc, const char **argv)
 206{
 207        return list_refs(&header->references, argc, argv);
 208}
 209
 210static int is_tag_in_date_range(struct object *tag, struct rev_info *revs)
 211{
 212        unsigned long size;
 213        enum object_type type;
 214        char *buf, *line, *lineend;
 215        unsigned long date;
 216
 217        if (revs->max_age == -1 && revs->min_age == -1)
 218                return 1;
 219
 220        buf = read_sha1_file(tag->sha1, &type, &size);
 221        if (!buf)
 222                return 1;
 223        line = memmem(buf, size, "\ntagger ", 8);
 224        if (!line++)
 225                return 1;
 226        lineend = memchr(line, buf + size - line, '\n');
 227        line = memchr(line, lineend ? lineend - line : buf + size - line, '>');
 228        if (!line++)
 229                return 1;
 230        date = strtoul(line, NULL, 10);
 231        free(buf);
 232        return (revs->max_age == -1 || revs->max_age < date) &&
 233                (revs->min_age == -1 || revs->min_age > date);
 234}
 235
 236int create_bundle(struct bundle_header *header, const char *path,
 237                int argc, const char **argv)
 238{
 239        static struct lock_file lock;
 240        int bundle_fd = -1;
 241        int bundle_to_stdout;
 242        const char **argv_boundary = xmalloc((argc + 4) * sizeof(const char *));
 243        const char **argv_pack = xmalloc(6 * sizeof(const char *));
 244        int i, ref_count = 0;
 245        struct strbuf buf = STRBUF_INIT;
 246        struct rev_info revs;
 247        struct child_process rls;
 248        FILE *rls_fout;
 249
 250        bundle_to_stdout = !strcmp(path, "-");
 251        if (bundle_to_stdout)
 252                bundle_fd = 1;
 253        else
 254                bundle_fd = hold_lock_file_for_update(&lock, path,
 255                                                      LOCK_DIE_ON_ERROR);
 256
 257        /* write signature */
 258        write_or_die(bundle_fd, bundle_signature, strlen(bundle_signature));
 259
 260        /* init revs to list objects for pack-objects later */
 261        save_commit_buffer = 0;
 262        init_revisions(&revs, NULL);
 263
 264        /* write prerequisites */
 265        memcpy(argv_boundary + 3, argv + 1, argc * sizeof(const char *));
 266        argv_boundary[0] = "rev-list";
 267        argv_boundary[1] = "--boundary";
 268        argv_boundary[2] = "--pretty=oneline";
 269        argv_boundary[argc + 2] = NULL;
 270        memset(&rls, 0, sizeof(rls));
 271        rls.argv = argv_boundary;
 272        rls.out = -1;
 273        rls.git_cmd = 1;
 274        if (start_command(&rls))
 275                return -1;
 276        rls_fout = xfdopen(rls.out, "r");
 277        while (strbuf_getwholeline(&buf, rls_fout, '\n') != EOF) {
 278                unsigned char sha1[20];
 279                if (buf.len > 0 && buf.buf[0] == '-') {
 280                        write_or_die(bundle_fd, buf.buf, buf.len);
 281                        if (!get_sha1_hex(buf.buf + 1, sha1)) {
 282                                struct object *object = parse_object(sha1);
 283                                object->flags |= UNINTERESTING;
 284                                add_pending_object(&revs, object, xstrdup(buf.buf));
 285                        }
 286                } else if (!get_sha1_hex(buf.buf, sha1)) {
 287                        struct object *object = parse_object(sha1);
 288                        object->flags |= SHOWN;
 289                }
 290        }
 291        strbuf_release(&buf);
 292        fclose(rls_fout);
 293        if (finish_command(&rls))
 294                return error(_("rev-list died"));
 295
 296        /* write references */
 297        argc = setup_revisions(argc, argv, &revs, NULL);
 298
 299        if (argc > 1)
 300                return error(_("unrecognized argument: %s"), argv[1]);
 301
 302        object_array_remove_duplicates(&revs.pending);
 303
 304        for (i = 0; i < revs.pending.nr; i++) {
 305                struct object_array_entry *e = revs.pending.objects + i;
 306                unsigned char sha1[20];
 307                char *ref;
 308                const char *display_ref;
 309                int flag;
 310
 311                if (e->item->flags & UNINTERESTING)
 312                        continue;
 313                if (dwim_ref(e->name, strlen(e->name), sha1, &ref) != 1)
 314                        continue;
 315                if (read_ref_full(e->name, sha1, 1, &flag))
 316                        flag = 0;
 317                display_ref = (flag & REF_ISSYMREF) ? e->name : ref;
 318
 319                if (e->item->type == OBJ_TAG &&
 320                                !is_tag_in_date_range(e->item, &revs)) {
 321                        e->item->flags |= UNINTERESTING;
 322                        continue;
 323                }
 324
 325                /*
 326                 * Make sure the refs we wrote out is correct; --max-count and
 327                 * other limiting options could have prevented all the tips
 328                 * from getting output.
 329                 *
 330                 * Non commit objects such as tags and blobs do not have
 331                 * this issue as they are not affected by those extra
 332                 * constraints.
 333                 */
 334                if (!(e->item->flags & SHOWN) && e->item->type == OBJ_COMMIT) {
 335                        warning(_("ref '%s' is excluded by the rev-list options"),
 336                                e->name);
 337                        free(ref);
 338                        continue;
 339                }
 340                /*
 341                 * If you run "git bundle create bndl v1.0..v2.0", the
 342                 * name of the positive ref is "v2.0" but that is the
 343                 * commit that is referenced by the tag, and not the tag
 344                 * itself.
 345                 */
 346                if (hashcmp(sha1, e->item->sha1)) {
 347                        /*
 348                         * Is this the positive end of a range expressed
 349                         * in terms of a tag (e.g. v2.0 from the range
 350                         * "v1.0..v2.0")?
 351                         */
 352                        struct commit *one = lookup_commit_reference(sha1);
 353                        struct object *obj;
 354
 355                        if (e->item == &(one->object)) {
 356                                /*
 357                                 * Need to include e->name as an
 358                                 * independent ref to the pack-objects
 359                                 * input, so that the tag is included
 360                                 * in the output; otherwise we would
 361                                 * end up triggering "empty bundle"
 362                                 * error.
 363                                 */
 364                                obj = parse_object(sha1);
 365                                obj->flags |= SHOWN;
 366                                add_pending_object(&revs, obj, e->name);
 367                        }
 368                        free(ref);
 369                        continue;
 370                }
 371
 372                ref_count++;
 373                write_or_die(bundle_fd, sha1_to_hex(e->item->sha1), 40);
 374                write_or_die(bundle_fd, " ", 1);
 375                write_or_die(bundle_fd, display_ref, strlen(display_ref));
 376                write_or_die(bundle_fd, "\n", 1);
 377                free(ref);
 378        }
 379        if (!ref_count)
 380                die(_("Refusing to create empty bundle."));
 381
 382        /* end header */
 383        write_or_die(bundle_fd, "\n", 1);
 384
 385        /* write pack */
 386        argv_pack[0] = "pack-objects";
 387        argv_pack[1] = "--all-progress-implied";
 388        argv_pack[2] = "--stdout";
 389        argv_pack[3] = "--thin";
 390        argv_pack[4] = "--delta-base-offset";
 391        argv_pack[5] = NULL;
 392        memset(&rls, 0, sizeof(rls));
 393        rls.argv = argv_pack;
 394        rls.in = -1;
 395        rls.out = bundle_fd;
 396        rls.git_cmd = 1;
 397        if (start_command(&rls))
 398                return error(_("Could not spawn pack-objects"));
 399
 400        /*
 401         * start_command closed bundle_fd if it was > 1
 402         * so set the lock fd to -1 so commit_lock_file()
 403         * won't fail trying to close it.
 404         */
 405        lock.fd = -1;
 406
 407        for (i = 0; i < revs.pending.nr; i++) {
 408                struct object *object = revs.pending.objects[i].item;
 409                if (object->flags & UNINTERESTING)
 410                        write_or_die(rls.in, "^", 1);
 411                write_or_die(rls.in, sha1_to_hex(object->sha1), 40);
 412                write_or_die(rls.in, "\n", 1);
 413        }
 414        close(rls.in);
 415        if (finish_command(&rls))
 416                return error(_("pack-objects died"));
 417        if (!bundle_to_stdout) {
 418                if (commit_lock_file(&lock))
 419                        die_errno(_("cannot create '%s'"), path);
 420        }
 421        return 0;
 422}
 423
 424int unbundle(struct bundle_header *header, int bundle_fd, int flags)
 425{
 426        const char *argv_index_pack[] = {"index-pack",
 427                                         "--fix-thin", "--stdin", NULL, NULL};
 428        struct child_process ip;
 429
 430        if (flags & BUNDLE_VERBOSE)
 431                argv_index_pack[3] = "-v";
 432
 433        if (verify_bundle(header, 0))
 434                return -1;
 435        memset(&ip, 0, sizeof(ip));
 436        ip.argv = argv_index_pack;
 437        ip.in = bundle_fd;
 438        ip.no_stdout = 1;
 439        ip.git_cmd = 1;
 440        if (run_command(&ip))
 441                return error(_("index-pack died"));
 442        return 0;
 443}