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 repository *r,
 131                   struct bundle_header *header,
 132                   int verbose)
 133 {
 134         /*
 135          * Do fast check, then if any prereqs are missing then go line by line
 136          * to be verbose about the errors
 137          */
 138         struct ref_list *p = &header->prerequisites;
 139         struct rev_info revs;
 140         const char *argv[] = {NULL, "--all", NULL};
 141         struct commit *commit;
 142         int i, ret = 0, req_nr;
 143         const char *message = _("Repository lacks these prerequisite commits:");
 144
 145         repo_init_revisions(r, &revs, NULL);
 146         for (i = 0; i < p->nr; i++) {
 147                 struct ref_list_entry *e = p->list + i;
 148                 struct object *o = parse_object(r, &e->oid);
 149                 if (o) {
 150                         o->flags |= PREREQ_MARK;
 151                         add_pending_object(&revs, o, e->name);
 152                         continue;
 153                 }
 154                 if (++ret == 1)
 155                         error("%s", message);
 156                 error("%s %s", oid_to_hex(&e->oid), e->name);
 157         }
 158         if (revs.pending.nr != p->nr)
 159                 return ret;
 160         req_nr = revs.pending.nr;
 161         setup_revisions(2, argv, &revs, NULL);
 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 < p->nr; i++) {
 172                 struct ref_list_entry *e = p->list + i;
 173                 struct object *o = parse_object(r, &e->oid);
 174                 assert(o); /* otherwise we'd have returned early */
 175                 if (o->flags & SHOWN)
 176                         continue;
 177                 if (++ret == 1)
 178                         error("%s", message);
 179                 error("%s %s", oid_to_hex(&e->oid), e->name);
 180         }
 181
 182         /* Clean up objects used, as they will be reused. */
 183         for (i = 0; i < p->nr; i++) {
 184                 struct ref_list_entry *e = p->list + i;
 185                 commit = lookup_commit_reference_gently(r, &e->oid, 1);
 186                 if (commit)
 187                         clear_commit_marks(commit, ALL_REV_FLAGS);
 188         }
 189
 190         if (verbose) {
 191                 struct ref_list *r;
 192
 193                 r = &header->references;
 194                 printf_ln(Q_("The bundle contains this ref:",
 195                              "The bundle contains these %d refs:",
 196                              r->nr),
 197                           r->nr);
 198                 list_refs(r, 0, NULL);
 199                 r = &header->prerequisites;
 200                 if (!r->nr) {
 201                         printf_ln(_("The bundle records a complete history."));
 202                 } else {
 203                         printf_ln(Q_("The bundle requires this ref:",
 204                                      "The bundle requires these %d refs:",
 205                                      r->nr),
 206                                   r->nr);
 207                         list_refs(r, 0, NULL);
 208                 }
 209         }
 210         return ret;
 211 }
 212
 213 int list_bundle_refs(struct bundle_header *header, int argc, const char **argv)
 214 {
 215         return list_refs(&header->references, argc, argv);
 216 }
 217
 218 static int is_tag_in_date_range(struct object *tag, struct rev_info *revs)
 219 {
 220         unsigned long size;
 221         enum object_type type;
 222         char *buf = NULL, *line, *lineend;
 223         timestamp_t date;
 224         int result = 1;
 225
 226         if (revs->max_age == -1 && revs->min_age == -1)
 227                 goto out;
 228
 229         buf = read_object_file(&tag->oid, &type, &size);
 230         if (!buf)
 231                 goto out;
 232         line = memmem(buf, size, "\ntagger ", 8);
 233         if (!line++)
 234                 goto out;
 235         lineend = memchr(line, '\n', buf + size - line);
 236         line = memchr(line, '>', lineend ? lineend - line : buf + size - line);
 237         if (!line++)
 238                 goto out;
 239         date = parse_timestamp(line, NULL, 10);
 240         result = (revs->max_age == -1 || revs->max_age < date) &&
 241                 (revs->min_age == -1 || revs->min_age > date);
 242 out:
 243         free(buf);
 244         return result;
 245 }
 246
 247
 248 /* Write the pack data to bundle_fd, then close it if it is > 1. */
 249 static int write_pack_data(int bundle_fd, struct rev_info *revs)
 250 {
 251         struct child_process pack_objects = CHILD_PROCESS_INIT;
 252         int i;
 253
 254         argv_array_pushl(&pack_objects.args,
 255                          "pack-objects", "--all-progress-implied",
 256                          "--stdout", "--thin", "--delta-base-offset",
 257                          NULL);
 258         pack_objects.in = -1;
 259         pack_objects.out = bundle_fd;
 260         pack_objects.git_cmd = 1;
 261         if (start_command(&pack_objects))
 262                 return error(_("Could not spawn pack-objects"));
 263
 264         for (i = 0; i < revs->pending.nr; i++) {
 265                 struct object *object = revs->pending.objects[i].item;
 266                 if (object->flags & UNINTERESTING)
 267                         write_or_die(pack_objects.in, "^", 1);
 268                 write_or_die(pack_objects.in, oid_to_hex(&object->oid), GIT_SHA1_HEXSZ);
 269                 write_or_die(pack_objects.in, "\n", 1);
 270         }
 271         close(pack_objects.in);
 272         if (finish_command(&pack_objects))
 273                 return error(_("pack-objects died"));
 274         return 0;
 275 }
 276
 277 static int compute_and_write_prerequisites(int bundle_fd,
 278                                            struct rev_info *revs,
 279                                            int argc, const char **argv)
 280 {
 281         struct child_process rls = CHILD_PROCESS_INIT;
 282         struct strbuf buf = STRBUF_INIT;
 283         FILE *rls_fout;
 284         int i;
 285
 286         argv_array_pushl(&rls.args,
 287                          "rev-list", "--boundary", "--pretty=oneline",
 288                          NULL);
 289         for (i = 1; i < argc; i++)
 290                 argv_array_push(&rls.args, argv[i]);
 291         rls.out = -1;
 292         rls.git_cmd = 1;
 293         if (start_command(&rls))
 294                 return -1;
 295         rls_fout = xfdopen(rls.out, "r");
 296         while (strbuf_getwholeline(&buf, rls_fout, '\n') != EOF) {
 297                 struct object_id oid;
 298                 if (buf.len > 0 && buf.buf[0] == '-') {
 299                         write_or_die(bundle_fd, buf.buf, buf.len);
 300                         if (!get_oid_hex(buf.buf + 1, &oid)) {
 301                                 struct object *object = parse_object_or_die(&oid,
 302                                                                             buf.buf);
 303                                 object->flags |= UNINTERESTING;
 304                                 add_pending_object(revs, object, buf.buf);
 305                         }
 306                 } else if (!get_oid_hex(buf.buf, &oid)) {
 307                         struct object *object = parse_object_or_die(&oid,
 308                                                                     buf.buf);
 309                         object->flags |= SHOWN;
 310                 }
 311         }
 312         strbuf_release(&buf);
 313         fclose(rls_fout);
 314         if (finish_command(&rls))
 315                 return error(_("rev-list died"));
 316         return 0;
 317 }
 318
 319 /*
 320  * Write out bundle refs based on the tips already
 321  * parsed into revs.pending. As a side effect, may
 322  * manipulate revs.pending to include additional
 323  * necessary objects (like tags).
 324  *
 325  * Returns the number of refs written, or negative
 326  * on error.
 327  */
 328 static int write_bundle_refs(int bundle_fd, struct rev_info *revs)
 329 {
 330         int i;
 331         int ref_count = 0;
 332
 333         for (i = 0; i < revs->pending.nr; i++) {
 334                 struct object_array_entry *e = revs->pending.objects + i;
 335                 struct object_id oid;
 336                 char *ref;
 337                 const char *display_ref;
 338                 int flag;
 339
 340                 if (e->item->flags & UNINTERESTING)
 341                         continue;
 342                 if (dwim_ref(e->name, strlen(e->name), &oid, &ref) != 1)
 343                         goto skip_write_ref;
 344                 if (read_ref_full(e->name, RESOLVE_REF_READING, &oid, &flag))
 345                         flag = 0;
 346                 display_ref = (flag & REF_ISSYMREF) ? e->name : ref;
 347
 348                 if (e->item->type == OBJ_TAG &&
 349                                 !is_tag_in_date_range(e->item, revs)) {
 350                         e->item->flags |= UNINTERESTING;
 351                         goto skip_write_ref;
 352                 }
 353
 354                 /*
 355                  * Make sure the refs we wrote out is correct; --max-count and
 356                  * other limiting options could have prevented all the tips
 357                  * from getting output.
 358                  *
 359                  * Non commit objects such as tags and blobs do not have
 360                  * this issue as they are not affected by those extra
 361                  * constraints.
 362                  */
 363                 if (!(e->item->flags & SHOWN) && e->item->type == OBJ_COMMIT) {
 364                         warning(_("ref '%s' is excluded by the rev-list options"),
 365                                 e->name);
 366                         goto skip_write_ref;
 367                 }
 368                 /*
 369                  * If you run "git bundle create bndl v1.0..v2.0", the
 370                  * name of the positive ref is "v2.0" but that is the
 371                  * commit that is referenced by the tag, and not the tag
 372                  * itself.
 373                  */
 374                 if (!oideq(&oid, &e->item->oid)) {
 375                         /*
 376                          * Is this the positive end of a range expressed
 377                          * in terms of a tag (e.g. v2.0 from the range
 378                          * "v1.0..v2.0")?
 379                          */
 380                         struct commit *one = lookup_commit_reference(revs->repo, &oid);
 381                         struct object *obj;
 382
 383                         if (e->item == &(one->object)) {
 384                                 /*
 385                                  * Need to include e->name as an
 386                                  * independent ref to the pack-objects
 387                                  * input, so that the tag is included
 388                                  * in the output; otherwise we would
 389                                  * end up triggering "empty bundle"
 390                                  * error.
 391                                  */
 392                                 obj = parse_object_or_die(&oid, e->name);
 393                                 obj->flags |= SHOWN;
 394                                 add_pending_object(revs, obj, e->name);
 395                         }
 396                         goto skip_write_ref;
 397                 }
 398
 399                 ref_count++;
 400                 write_or_die(bundle_fd, oid_to_hex(&e->item->oid), 40);
 401                 write_or_die(bundle_fd, " ", 1);
 402                 write_or_die(bundle_fd, display_ref, strlen(display_ref));
 403                 write_or_die(bundle_fd, "\n", 1);
 404  skip_write_ref:
 405                 free(ref);
 406         }
 407
 408         /* end header */
 409         write_or_die(bundle_fd, "\n", 1);
 410         return ref_count;
 411 }
 412
 413 int create_bundle(struct repository *r, struct bundle_header *header,
 414                   const char *path, int argc, const char **argv)
 415 {
 416         struct lock_file lock = LOCK_INIT;
 417         int bundle_fd = -1;
 418         int bundle_to_stdout;
 419         int ref_count = 0;
 420         struct rev_info revs;
 421
 422         bundle_to_stdout = !strcmp(path, "-");
 423         if (bundle_to_stdout)
 424                 bundle_fd = 1;
 425         else {
 426                 bundle_fd = hold_lock_file_for_update(&lock, path,
 427                                                       LOCK_DIE_ON_ERROR);
 428
 429                 /*
 430                  * write_pack_data() will close the fd passed to it,
 431                  * but commit_lock_file() will also try to close the
 432                  * lockfile's fd. So make a copy of the file
 433                  * descriptor to avoid trying to close it twice.
 434                  */
 435                 bundle_fd = dup(bundle_fd);
 436                 if (bundle_fd < 0)
 437                         die_errno("unable to dup file descriptor");
 438         }
 439
 440         /* write signature */
 441         write_or_die(bundle_fd, bundle_signature, strlen(bundle_signature));
 442
 443         /* init revs to list objects for pack-objects later */
 444         save_commit_buffer = 0;
 445         repo_init_revisions(r, &revs, NULL);
 446
 447         /* write prerequisites */
 448         if (compute_and_write_prerequisites(bundle_fd, &revs, argc, argv))
 449                 goto err;
 450
 451         argc = setup_revisions(argc, argv, &revs, NULL);
 452
 453         if (argc > 1) {
 454                 error(_("unrecognized argument: %s"), argv[1]);
 455                 goto err;
 456         }
 457
 458         object_array_remove_duplicates(&revs.pending);
 459
 460         ref_count = write_bundle_refs(bundle_fd, &revs);
 461         if (!ref_count)
 462                 die(_("Refusing to create empty bundle."));
 463         else if (ref_count < 0)
 464                 goto err;
 465
 466         /* write pack */
 467         if (write_pack_data(bundle_fd, &revs)) {
 468                 bundle_fd = -1; /* already closed by the above call */
 469                 goto err;
 470         }
 471
 472         if (!bundle_to_stdout) {
 473                 if (commit_lock_file(&lock))
 474                         die_errno(_("cannot create '%s'"), path);
 475         }
 476         return 0;
 477 err:
 478         if (!bundle_to_stdout) {
 479                 if (0 <= bundle_fd)
 480                         close(bundle_fd);
 481                 rollback_lock_file(&lock);
 482         }
 483         return -1;
 484 }
 485
 486 int unbundle(struct repository *r, struct bundle_header *header,
 487              int bundle_fd, int flags)
 488 {
 489         const char *argv_index_pack[] = {"index-pack",
 490                                          "--fix-thin", "--stdin", NULL, NULL};
 491         struct child_process ip = CHILD_PROCESS_INIT;
 492
 493         if (flags & BUNDLE_VERBOSE)
 494                 argv_index_pack[3] = "-v";
 495
 496         if (verify_bundle(r, header, 0))
 497                 return -1;
 498         ip.argv = argv_index_pack;
 499         ip.in = bundle_fd;
 500         ip.no_stdout = 1;
 501         ip.git_cmd = 1;
 502         if (run_command(&ip))
 503                 return error(_("index-pack died"));
 504         return 0;
 505 }