bundle.c

   1 #include "cache.h"
   2 #include "lockfile.h"
   3 #include "bundle.h"
   4 #include "object-store.h"
   5 #include "repository.h"
   6 #include "object.h"
   7 #include "commit.h"
   8 #include "diff.h"
   9 #include "revision.h"
  10 #include "list-objects.h"
  11 #include "run-command.h"
  12 #include "refs.h"
  13 #include "argv-array.h"
  14
  15 static const char bundle_signature[] = "# v2 git bundle\n";
  16
  17 static void add_to_ref_list(const struct object_id *oid, const char *name,
  18                 struct ref_list *list)
  19 {
  20         ALLOC_GROW(list->list, list->nr + 1, list->alloc);
  21         oidcpy(&list->list[list->nr].oid, oid);
  22         list->list[list->nr].name = xstrdup(name);
  23         list->nr++;
  24 }
  25
  26 static 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                 struct object_id oid;
  46                 int is_prereq = 0;
  47                 const char *p;
  48
  49                 if (*buf.buf == '-') {
  50                         is_prereq = 1;
  51                         strbuf_remove(&buf, 0, 1);
  52                 }
  53                 strbuf_rtrim(&buf);
  54
  55                 /*
  56                  * Tip lines have object name, SP, and refname.
  57                  * Prerequisites have object name that is optionally
  58                  * followed by SP and subject line.
  59                  */
  60                 if (parse_oid_hex(buf.buf, &oid, &p) ||
  61                     (*p && !isspace(*p)) ||
  62                     (!is_prereq && !*p)) {
  63                         if (report_path)
  64                                 error(_("unrecognized header: %s%s (%d)"),
  65                                       (is_prereq ? "-" : ""), buf.buf, (int)buf.len);
  66                         status = -1;
  67                         break;
  68                 } else {
  69                         if (is_prereq)
  70                                 add_to_ref_list(&oid, "", &header->prerequisites);
  71                         else
  72                                 add_to_ref_list(&oid, p + 1, &header->references);
  73                 }
  74         }
  75
  76  abort:
  77         if (status) {
  78                 close(fd);
  79                 fd = -1;
  80         }
  81         strbuf_release(&buf);
  82         return fd;
  83 }
  84
  85 int read_bundle_header(const char *path, struct bundle_header *header)
  86 {
  87         int fd = open(path, O_RDONLY);
  88
  89         if (fd < 0)
  90                 return error(_("could not open '%s'"), path);
  91         return parse_bundle_header(fd, header, path);
  92 }
  93
  94 int is_bundle(const char *path, int quiet)
  95 {
  96         struct bundle_header header;
  97         int fd = open(path, O_RDONLY);
  98
  99         if (fd < 0)
 100                 return 0;
 101         memset(&header, 0, sizeof(header));
 102         fd = parse_bundle_header(fd, &header, quiet ? NULL : path);
 103         if (fd >= 0)
 104                 close(fd);
 105         return (fd >= 0);
 106 }
 107
 108 static int list_refs(struct ref_list *r, int argc, const char **argv)
 109 {
 110         int i;
 111
 112         for (i = 0; i < r->nr; i++) {
 113                 if (argc > 1) {
 114                         int j;
 115                         for (j = 1; j < argc; j++)
 116                                 if (!strcmp(r->list[i].name, argv[j]))
 117                                         break;
 118                         if (j == argc)
 119                                 continue;
 120                 }
 121                 printf("%s %s\n", oid_to_hex(&r->list[i].oid),
 122                                 r->list[i].name);
 123         }
 124         return 0;
 125 }
 126
 127 /* Remember to update object flag allocation in object.h */
 128 #define PREREQ_MARK (1u<<16)
 129
 130 int verify_bundle(struct bundle_header *header, int verbose)
 131 {
 132         /*
 133          * Do fast check, then if any prereqs are missing then go line by line
 134          * to be verbose about the errors
 135          */
 136         struct ref_list *p = &header->prerequisites;
 137         struct rev_info revs;
 138         const char *argv[] = {NULL, "--all", NULL};
 139         struct commit *commit;
 140         int i, ret = 0, req_nr;
 141         const char *message = _("Repository lacks these prerequisite commits:");
 142
 143         init_revisions(&revs, NULL);
 144         for (i = 0; i < p->nr; i++) {
 145                 struct ref_list_entry *e = p->list + i;
 146                 struct object *o = parse_object(the_repository, &e->oid);
 147                 if (o) {
 148                         o->flags |= PREREQ_MARK;
 149                         add_pending_object(&revs, o, e->name);
 150                         continue;
 151                 }
 152                 if (++ret == 1)
 153                         error("%s", message);
 154                 error("%s %s", oid_to_hex(&e->oid), e->name);
 155         }
 156         if (revs.pending.nr != p->nr)
 157                 return ret;
 158         req_nr = revs.pending.nr;
 159         setup_revisions(2, argv, &revs, NULL);
 160
 161         if (prepare_revision_walk(&revs))
 162                 die(_("revision walk setup failed"));
 163
 164         i = req_nr;
 165         while (i && (commit = get_revision(&revs)))
 166                 if (commit->object.flags & PREREQ_MARK)
 167                         i--;
 168
 169         for (i = 0; i < p->nr; i++) {
 170                 struct ref_list_entry *e = p->list + i;
 171                 struct object *o = parse_object(the_repository, &e->oid);
 172                 assert(o); /* otherwise we'd have returned early */
 173                 if (o->flags & SHOWN)
 174                         continue;
 175                 if (++ret == 1)
 176                         error("%s", message);
 177                 error("%s %s", oid_to_hex(&e->oid), e->name);
 178         }
 179
 180         /* Clean up objects used, as they will be reused. */
 181         for (i = 0; i < p->nr; i++) {
 182                 struct ref_list_entry *e = p->list + i;
 183                 commit = lookup_commit_reference_gently(the_repository, &e->oid, 1);
 184                 if (commit)
 185                         clear_commit_marks(commit, ALL_REV_FLAGS);
 186         }
 187
 188         if (verbose) {
 189                 struct ref_list *r;
 190
 191                 r = &header->references;
 192                 printf_ln(Q_("The bundle contains this ref:",
 193                              "The bundle contains these %d refs:",
 194                              r->nr),
 195                           r->nr);
 196                 list_refs(r, 0, NULL);
 197                 r = &header->prerequisites;
 198                 if (!r->nr) {
 199                         printf_ln(_("The bundle records a complete history."));
 200                 } else {
 201                         printf_ln(Q_("The bundle requires this ref:",
 202                                      "The bundle requires these %d refs:",
 203                                      r->nr),
 204                                   r->nr);
 205                         list_refs(r, 0, NULL);
 206                 }
 207         }
 208         return ret;
 209 }
 210
 211 int list_bundle_refs(struct bundle_header *header, int argc, const char **argv)
 212 {
 213         return list_refs(&header->references, argc, argv);
 214 }
 215
 216 static int is_tag_in_date_range(struct object *tag, struct rev_info *revs)
 217 {
 218         unsigned long size;
 219         enum object_type type;
 220         char *buf = NULL, *line, *lineend;
 221         timestamp_t date;
 222         int result = 1;
 223
 224         if (revs->max_age == -1 && revs->min_age == -1)
 225                 goto out;
 226
 227         buf = read_object_file(&tag->oid, &type, &size);
 228         if (!buf)
 229                 goto out;
 230         line = memmem(buf, size, "\ntagger ", 8);
 231         if (!line++)
 232                 goto out;
 233         lineend = memchr(line, '\n', buf + size - line);
 234         line = memchr(line, '>', lineend ? lineend - line : buf + size - line);
 235         if (!line++)
 236                 goto out;
 237         date = parse_timestamp(line, NULL, 10);
 238         result = (revs->max_age == -1 || revs->max_age < date) &&
 239                 (revs->min_age == -1 || revs->min_age > date);
 240 out:
 241         free(buf);
 242         return result;
 243 }
 244
 245
 246 /* Write the pack data to bundle_fd, then close it if it is > 1. */
 247 static int write_pack_data(int bundle_fd, struct rev_info *revs)
 248 {
 249         struct child_process pack_objects = CHILD_PROCESS_INIT;
 250         int i;
 251
 252         argv_array_pushl(&pack_objects.args,
 253                          "pack-objects", "--all-progress-implied",
 254                          "--stdout", "--thin", "--delta-base-offset",
 255                          NULL);
 256         pack_objects.in = -1;
 257         pack_objects.out = bundle_fd;
 258         pack_objects.git_cmd = 1;
 259         if (start_command(&pack_objects))
 260                 return error(_("Could not spawn pack-objects"));
 261
 262         for (i = 0; i < revs->pending.nr; i++) {
 263                 struct object *object = revs->pending.objects[i].item;
 264                 if (object->flags & UNINTERESTING)
 265                         write_or_die(pack_objects.in, "^", 1);
 266                 write_or_die(pack_objects.in, oid_to_hex(&object->oid), GIT_SHA1_HEXSZ);
 267                 write_or_die(pack_objects.in, "\n", 1);
 268         }
 269         close(pack_objects.in);
 270         if (finish_command(&pack_objects))
 271                 return error(_("pack-objects died"));
 272         return 0;
 273 }
 274
 275 static int compute_and_write_prerequisites(int bundle_fd,
 276                                            struct rev_info *revs,
 277                                            int argc, const char **argv)
 278 {
 279         struct child_process rls = CHILD_PROCESS_INIT;
 280         struct strbuf buf = STRBUF_INIT;
 281         FILE *rls_fout;
 282         int i;
 283
 284         argv_array_pushl(&rls.args,
 285                          "rev-list", "--boundary", "--pretty=oneline",
 286                          NULL);
 287         for (i = 1; i < argc; i++)
 288                 argv_array_push(&rls.args, argv[i]);
 289         rls.out = -1;
 290         rls.git_cmd = 1;
 291         if (start_command(&rls))
 292                 return -1;
 293         rls_fout = xfdopen(rls.out, "r");
 294         while (strbuf_getwholeline(&buf, rls_fout, '\n') != EOF) {
 295                 struct object_id oid;
 296                 if (buf.len > 0 && buf.buf[0] == '-') {
 297                         write_or_die(bundle_fd, buf.buf, buf.len);
 298                         if (!get_oid_hex(buf.buf + 1, &oid)) {
 299                                 struct object *object = parse_object_or_die(&oid,
 300                                                                             buf.buf);
 301                                 object->flags |= UNINTERESTING;
 302                                 add_pending_object(revs, object, buf.buf);
 303                         }
 304                 } else if (!get_oid_hex(buf.buf, &oid)) {
 305                         struct object *object = parse_object_or_die(&oid,
 306                                                                     buf.buf);
 307                         object->flags |= SHOWN;
 308                 }
 309         }
 310         strbuf_release(&buf);
 311         fclose(rls_fout);
 312         if (finish_command(&rls))
 313                 return error(_("rev-list died"));
 314         return 0;
 315 }
 316
 317 /*
 318  * Write out bundle refs based on the tips already
 319  * parsed into revs.pending. As a side effect, may
 320  * manipulate revs.pending to include additional
 321  * necessary objects (like tags).
 322  *
 323  * Returns the number of refs written, or negative
 324  * on error.
 325  */
 326 static int write_bundle_refs(int bundle_fd, struct rev_info *revs)
 327 {
 328         int i;
 329         int ref_count = 0;
 330
 331         for (i = 0; i < revs->pending.nr; i++) {
 332                 struct object_array_entry *e = revs->pending.objects + i;
 333                 struct object_id oid;
 334                 char *ref;
 335                 const char *display_ref;
 336                 int flag;
 337
 338                 if (e->item->flags & UNINTERESTING)
 339                         continue;
 340                 if (dwim_ref(e->name, strlen(e->name), &oid, &ref) != 1)
 341                         goto skip_write_ref;
 342                 if (read_ref_full(e->name, RESOLVE_REF_READING, &oid, &flag))
 343                         flag = 0;
 344                 display_ref = (flag & REF_ISSYMREF) ? e->name : ref;
 345
 346                 if (e->item->type == OBJ_TAG &&
 347                                 !is_tag_in_date_range(e->item, revs)) {
 348                         e->item->flags |= UNINTERESTING;
 349                         goto skip_write_ref;
 350                 }
 351
 352                 /*
 353                  * Make sure the refs we wrote out is correct; --max-count and
 354                  * other limiting options could have prevented all the tips
 355                  * from getting output.
 356                  *
 357                  * Non commit objects such as tags and blobs do not have
 358                  * this issue as they are not affected by those extra
 359                  * constraints.
 360                  */
 361                 if (!(e->item->flags & SHOWN) && e->item->type == OBJ_COMMIT) {
 362                         warning(_("ref '%s' is excluded by the rev-list options"),
 363                                 e->name);
 364                         goto skip_write_ref;
 365                 }
 366                 /*
 367                  * If you run "git bundle create bndl v1.0..v2.0", the
 368                  * name of the positive ref is "v2.0" but that is the
 369                  * commit that is referenced by the tag, and not the tag
 370                  * itself.
 371                  */
 372                 if (oidcmp(&oid, &e->item->oid)) {
 373                         /*
 374                          * Is this the positive end of a range expressed
 375                          * in terms of a tag (e.g. v2.0 from the range
 376                          * "v1.0..v2.0")?
 377                          */
 378                         struct commit *one = lookup_commit_reference(the_repository,
 379                                                                      &oid);
 380                         struct object *obj;
 381
 382                         if (e->item == &(one->object)) {
 383                                 /*
 384                                  * Need to include e->name as an
 385                                  * independent ref to the pack-objects
 386                                  * input, so that the tag is included
 387                                  * in the output; otherwise we would
 388                                  * end up triggering "empty bundle"
 389                                  * error.
 390                                  */
 391                                 obj = parse_object_or_die(&oid, e->name);
 392                                 obj->flags |= SHOWN;
 393                                 add_pending_object(revs, obj, e->name);
 394                         }
 395                         goto skip_write_ref;
 396                 }
 397
 398                 ref_count++;
 399                 write_or_die(bundle_fd, oid_to_hex(&e->item->oid), 40);
 400                 write_or_die(bundle_fd, " ", 1);
 401                 write_or_die(bundle_fd, display_ref, strlen(display_ref));
 402                 write_or_die(bundle_fd, "\n", 1);
 403  skip_write_ref:
 404                 free(ref);
 405         }
 406
 407         /* end header */
 408         write_or_die(bundle_fd, "\n", 1);
 409         return ref_count;
 410 }
 411
 412 int create_bundle(struct bundle_header *header, const char *path,
 413                   int argc, const char **argv)
 414 {
 415         struct lock_file lock = LOCK_INIT;
 416         int bundle_fd = -1;
 417         int bundle_to_stdout;
 418         int ref_count = 0;
 419         struct rev_info revs;
 420
 421         bundle_to_stdout = !strcmp(path, "-");
 422         if (bundle_to_stdout)
 423                 bundle_fd = 1;
 424         else {
 425                 bundle_fd = hold_lock_file_for_update(&lock, path,
 426                                                       LOCK_DIE_ON_ERROR);
 427
 428                 /*
 429                  * write_pack_data() will close the fd passed to it,
 430                  * but commit_lock_file() will also try to close the
 431                  * lockfile's fd. So make a copy of the file
 432                  * descriptor to avoid trying to close it twice.
 433                  */
 434                 bundle_fd = dup(bundle_fd);
 435                 if (bundle_fd < 0)
 436                         die_errno("unable to dup file descriptor");
 437         }
 438
 439         /* write signature */
 440         write_or_die(bundle_fd, bundle_signature, strlen(bundle_signature));
 441
 442         /* init revs to list objects for pack-objects later */
 443         save_commit_buffer = 0;
 444         init_revisions(&revs, NULL);
 445
 446         /* write prerequisites */
 447         if (compute_and_write_prerequisites(bundle_fd, &revs, argc, argv))
 448                 goto err;
 449
 450         argc = setup_revisions(argc, argv, &revs, NULL);
 451
 452         if (argc > 1) {
 453                 error(_("unrecognized argument: %s"), argv[1]);
 454                 goto err;
 455         }
 456
 457         object_array_remove_duplicates(&revs.pending);
 458
 459         ref_count = write_bundle_refs(bundle_fd, &revs);
 460         if (!ref_count)
 461                 die(_("Refusing to create empty bundle."));
 462         else if (ref_count < 0)
 463                 goto err;
 464
 465         /* write pack */
 466         if (write_pack_data(bundle_fd, &revs)) {
 467                 bundle_fd = -1; /* already closed by the above call */
 468                 goto err;
 469         }
 470
 471         if (!bundle_to_stdout) {
 472                 if (commit_lock_file(&lock))
 473                         die_errno(_("cannot create '%s'"), path);
 474         }
 475         return 0;
 476 err:
 477         if (!bundle_to_stdout) {
 478                 if (0 <= bundle_fd)
 479                         close(bundle_fd);
 480                 rollback_lock_file(&lock);
 481         }
 482         return -1;
 483 }
 484
 485 int unbundle(struct bundle_header *header, int bundle_fd, int flags)
 486 {
 487         const char *argv_index_pack[] = {"index-pack",
 488                                          "--fix-thin", "--stdin", NULL, NULL};
 489         struct child_process ip = CHILD_PROCESS_INIT;
 490
 491         if (flags & BUNDLE_VERBOSE)
 492                 argv_index_pack[3] = "-v";
 493
 494         if (verify_bundle(header, 0))
 495                 return -1;
 496         ip.argv = argv_index_pack;
 497         ip.in = bundle_fd;
 498         ip.no_stdout = 1;
 499         ip.git_cmd = 1;
 500         if (run_command(&ip))
 501                 return error(_("index-pack died"));
 502         return 0;
 503 }