0542093ee8df41a0e4d80a770b0a84a9b9fc6f3e
   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("The bundle contains %d ref%s\n",
 187                       r->nr, (1 < r->nr) ? "s" : "");
 188                list_refs(r, 0, NULL);
 189                r = &header->prerequisites;
 190                printf("The bundle requires these %d ref%s\n",
 191                       r->nr, (1 < r->nr) ? "s" : "");
 192                list_refs(r, 0, NULL);
 193        }
 194        return ret;
 195}
 196
 197int list_bundle_refs(struct bundle_header *header, int argc, const char **argv)
 198{
 199        return list_refs(&header->references, argc, argv);
 200}
 201
 202static int is_tag_in_date_range(struct object *tag, struct rev_info *revs)
 203{
 204        unsigned long size;
 205        enum object_type type;
 206        char *buf, *line, *lineend;
 207        unsigned long date;
 208
 209        if (revs->max_age == -1 && revs->min_age == -1)
 210                return 1;
 211
 212        buf = read_sha1_file(tag->sha1, &type, &size);
 213        if (!buf)
 214                return 1;
 215        line = memmem(buf, size, "\ntagger ", 8);
 216        if (!line++)
 217                return 1;
 218        lineend = memchr(line, buf + size - line, '\n');
 219        line = memchr(line, lineend ? lineend - line : buf + size - line, '>');
 220        if (!line++)
 221                return 1;
 222        date = strtoul(line, NULL, 10);
 223        free(buf);
 224        return (revs->max_age == -1 || revs->max_age < date) &&
 225                (revs->min_age == -1 || revs->min_age > date);
 226}
 227
 228int create_bundle(struct bundle_header *header, const char *path,
 229                int argc, const char **argv)
 230{
 231        static struct lock_file lock;
 232        int bundle_fd = -1;
 233        int bundle_to_stdout;
 234        const char **argv_boundary = xmalloc((argc + 4) * sizeof(const char *));
 235        const char **argv_pack = xmalloc(6 * sizeof(const char *));
 236        int i, ref_count = 0;
 237        char buffer[1024];
 238        struct rev_info revs;
 239        struct child_process rls;
 240        FILE *rls_fout;
 241
 242        bundle_to_stdout = !strcmp(path, "-");
 243        if (bundle_to_stdout)
 244                bundle_fd = 1;
 245        else
 246                bundle_fd = hold_lock_file_for_update(&lock, path,
 247                                                      LOCK_DIE_ON_ERROR);
 248
 249        /* write signature */
 250        write_or_die(bundle_fd, bundle_signature, strlen(bundle_signature));
 251
 252        /* init revs to list objects for pack-objects later */
 253        save_commit_buffer = 0;
 254        init_revisions(&revs, NULL);
 255
 256        /* write prerequisites */
 257        memcpy(argv_boundary + 3, argv + 1, argc * sizeof(const char *));
 258        argv_boundary[0] = "rev-list";
 259        argv_boundary[1] = "--boundary";
 260        argv_boundary[2] = "--pretty=oneline";
 261        argv_boundary[argc + 2] = NULL;
 262        memset(&rls, 0, sizeof(rls));
 263        rls.argv = argv_boundary;
 264        rls.out = -1;
 265        rls.git_cmd = 1;
 266        if (start_command(&rls))
 267                return -1;
 268        rls_fout = xfdopen(rls.out, "r");
 269        while (fgets(buffer, sizeof(buffer), rls_fout)) {
 270                unsigned char sha1[20];
 271                if (buffer[0] == '-') {
 272                        write_or_die(bundle_fd, buffer, strlen(buffer));
 273                        if (!get_sha1_hex(buffer + 1, sha1)) {
 274                                struct object *object = parse_object(sha1);
 275                                object->flags |= UNINTERESTING;
 276                                add_pending_object(&revs, object, buffer);
 277                        }
 278                } else if (!get_sha1_hex(buffer, sha1)) {
 279                        struct object *object = parse_object(sha1);
 280                        object->flags |= SHOWN;
 281                }
 282        }
 283        fclose(rls_fout);
 284        if (finish_command(&rls))
 285                return error("rev-list died");
 286
 287        /* write references */
 288        argc = setup_revisions(argc, argv, &revs, NULL);
 289
 290        if (argc > 1)
 291                return error("unrecognized argument: %s'", argv[1]);
 292
 293        object_array_remove_duplicates(&revs.pending);
 294
 295        for (i = 0; i < revs.pending.nr; i++) {
 296                struct object_array_entry *e = revs.pending.objects + i;
 297                unsigned char sha1[20];
 298                char *ref;
 299                const char *display_ref;
 300                int flag;
 301
 302                if (e->item->flags & UNINTERESTING)
 303                        continue;
 304                if (dwim_ref(e->name, strlen(e->name), sha1, &ref) != 1)
 305                        continue;
 306                if (!resolve_ref(e->name, sha1, 1, &flag))
 307                        flag = 0;
 308                display_ref = (flag & REF_ISSYMREF) ? e->name : ref;
 309
 310                if (e->item->type == OBJ_TAG &&
 311                                !is_tag_in_date_range(e->item, &revs)) {
 312                        e->item->flags |= UNINTERESTING;
 313                        continue;
 314                }
 315
 316                /*
 317                 * Make sure the refs we wrote out is correct; --max-count and
 318                 * other limiting options could have prevented all the tips
 319                 * from getting output.
 320                 *
 321                 * Non commit objects such as tags and blobs do not have
 322                 * this issue as they are not affected by those extra
 323                 * constraints.
 324                 */
 325                if (!(e->item->flags & SHOWN) && e->item->type == OBJ_COMMIT) {
 326                        warning("ref '%s' is excluded by the rev-list options",
 327                                e->name);
 328                        free(ref);
 329                        continue;
 330                }
 331                /*
 332                 * If you run "git bundle create bndl v1.0..v2.0", the
 333                 * name of the positive ref is "v2.0" but that is the
 334                 * commit that is referenced by the tag, and not the tag
 335                 * itself.
 336                 */
 337                if (hashcmp(sha1, e->item->sha1)) {
 338                        /*
 339                         * Is this the positive end of a range expressed
 340                         * in terms of a tag (e.g. v2.0 from the range
 341                         * "v1.0..v2.0")?
 342                         */
 343                        struct commit *one = lookup_commit_reference(sha1);
 344                        struct object *obj;
 345
 346                        if (e->item == &(one->object)) {
 347                                /*
 348                                 * Need to include e->name as an
 349                                 * independent ref to the pack-objects
 350                                 * input, so that the tag is included
 351                                 * in the output; otherwise we would
 352                                 * end up triggering "empty bundle"
 353                                 * error.
 354                                 */
 355                                obj = parse_object(sha1);
 356                                obj->flags |= SHOWN;
 357                                add_pending_object(&revs, obj, e->name);
 358                        }
 359                        free(ref);
 360                        continue;
 361                }
 362
 363                ref_count++;
 364                write_or_die(bundle_fd, sha1_to_hex(e->item->sha1), 40);
 365                write_or_die(bundle_fd, " ", 1);
 366                write_or_die(bundle_fd, display_ref, strlen(display_ref));
 367                write_or_die(bundle_fd, "\n", 1);
 368                free(ref);
 369        }
 370        if (!ref_count)
 371                die ("Refusing to create empty bundle.");
 372
 373        /* end header */
 374        write_or_die(bundle_fd, "\n", 1);
 375
 376        /* write pack */
 377        argv_pack[0] = "pack-objects";
 378        argv_pack[1] = "--all-progress-implied";
 379        argv_pack[2] = "--stdout";
 380        argv_pack[3] = "--thin";
 381        argv_pack[4] = "--delta-base-offset";
 382        argv_pack[5] = NULL;
 383        memset(&rls, 0, sizeof(rls));
 384        rls.argv = argv_pack;
 385        rls.in = -1;
 386        rls.out = bundle_fd;
 387        rls.git_cmd = 1;
 388        if (start_command(&rls))
 389                return error("Could not spawn pack-objects");
 390
 391        /*
 392         * start_command closed bundle_fd if it was > 1
 393         * so set the lock fd to -1 so commit_lock_file()
 394         * won't fail trying to close it.
 395         */
 396        lock.fd = -1;
 397
 398        for (i = 0; i < revs.pending.nr; i++) {
 399                struct object *object = revs.pending.objects[i].item;
 400                if (object->flags & UNINTERESTING)
 401                        write_or_die(rls.in, "^", 1);
 402                write_or_die(rls.in, sha1_to_hex(object->sha1), 40);
 403                write_or_die(rls.in, "\n", 1);
 404        }
 405        close(rls.in);
 406        if (finish_command(&rls))
 407                return error ("pack-objects died");
 408        if (!bundle_to_stdout) {
 409                if (commit_lock_file(&lock))
 410                        die_errno("cannot create '%s'", path);
 411        }
 412        return 0;
 413}
 414
 415int unbundle(struct bundle_header *header, int bundle_fd, int flags)
 416{
 417        const char *argv_index_pack[] = {"index-pack",
 418                                         "--fix-thin", "--stdin", NULL, NULL};
 419        struct child_process ip;
 420
 421        if (flags & BUNDLE_VERBOSE)
 422                argv_index_pack[3] = "-v";
 423
 424        if (verify_bundle(header, 0))
 425                return -1;
 426        memset(&ip, 0, sizeof(ip));
 427        ip.argv = argv_index_pack;
 428        ip.in = bundle_fd;
 429        ip.no_stdout = 1;
 430        ip.git_cmd = 1;
 431        if (run_command(&ip))
 432                return error("index-pack died");
 433        return 0;
 434}