bundle.c

   1 #include "cache.h"
   2 #include "lockfile.h"
   3 #include "bundle.h"
   4 #include "object.h"
   5 #include "commit.h"
   6 #include "diff.h"
   7 #include "revision.h"
   8 #include "list-objects.h"
   9 #include "run-command.h"
  10 #include "refs.h"
  11 #include "argv-array.h"
  12
  13 static const char bundle_signature[] = "# v2 git bundle\n";
  14
  15 static void add_to_ref_list(const struct object_id *oid, const char *name,
  16                 struct ref_list *list)
  17 {
  18         ALLOC_GROW(list->list, list->nr + 1, list->alloc);
  19         oidcpy(&list->list[list->nr].oid, oid);
  20         list->list[list->nr].name = xstrdup(name);
  21         list->nr++;
  22 }
  23
  24 static int parse_bundle_header(int fd, struct bundle_header *header,
  25                                const char *report_path)
  26 {
  27         struct strbuf buf = STRBUF_INIT;
  28         int status = 0;
  29
  30         /* The bundle header begins with the signature */
  31         if (strbuf_getwholeline_fd(&buf, fd, '\n') ||
  32             strcmp(buf.buf, bundle_signature)) {
  33                 if (report_path)
  34                         error(_("'%s' does not look like a v2 bundle file"),
  35                               report_path);
  36                 status = -1;
  37                 goto abort;
  38         }
  39
  40         /* The bundle header ends with an empty line */
  41         while (!strbuf_getwholeline_fd(&buf, fd, '\n') &&
  42                buf.len && buf.buf[0] != '\n') {
  43                 struct object_id oid;
  44                 int is_prereq = 0;
  45                 const char *p;
  46
  47                 if (*buf.buf == '-') {
  48                         is_prereq = 1;
  49                         strbuf_remove(&buf, 0, 1);
  50                 }
  51                 strbuf_rtrim(&buf);
  52
  53                 /*
  54                  * Tip lines have object name, SP, and refname.
  55                  * Prerequisites have object name that is optionally
  56                  * followed by SP and subject line.
  57                  */
  58                 if (parse_oid_hex(buf.buf, &oid, &p) ||
  59                     (*p && !isspace(*p)) ||
  60                     (!is_prereq && !*p)) {
  61                         if (report_path)
  62                                 error(_("unrecognized header: %s%s (%d)"),
  63                                       (is_prereq ? "-" : ""), buf.buf, (int)buf.len);
  64                         status = -1;
  65                         break;
  66                 } else {
  67                         if (is_prereq)
  68                                 add_to_ref_list(&oid, "", &header->prerequisites);
  69                         else
  70                                 add_to_ref_list(&oid, p + 1, &header->references);
  71                 }
  72         }
  73
  74  abort:
  75         if (status) {
  76                 close(fd);
  77                 fd = -1;
  78         }
  79         strbuf_release(&buf);
  80         return fd;
  81 }
  82
  83 int read_bundle_header(const char *path, struct bundle_header *header)
  84 {
  85         int fd = open(path, O_RDONLY);
  86
  87         if (fd < 0)
  88                 return error(_("could not open '%s'"), path);
  89         return parse_bundle_header(fd, header, path);
  90 }
  91
  92 int is_bundle(const char *path, int quiet)
  93 {
  94         struct bundle_header header;
  95         int fd = open(path, O_RDONLY);
  96
  97         if (fd < 0)
  98                 return 0;
  99         memset(&header, 0, sizeof(header));
 100         fd = parse_bundle_header(fd, &header, quiet ? NULL : path);
 101         if (fd >= 0)
 102                 close(fd);
 103         return (fd >= 0);
 104 }
 105
 106 static int list_refs(struct ref_list *r, int argc, const char **argv)
 107 {
 108         int i;
 109
 110         for (i = 0; i < r->nr; i++) {
 111                 if (argc > 1) {
 112                         int j;
 113                         for (j = 1; j < argc; j++)
 114                                 if (!strcmp(r->list[i].name, argv[j]))
 115                                         break;
 116                         if (j == argc)
 117                                 continue;
 118                 }
 119                 printf("%s %s\n", oid_to_hex(&r->list[i].oid),
 120                                 r->list[i].name);
 121         }
 122         return 0;
 123 }
 124
 125 /* Remember to update object flag allocation in object.h */
 126 #define PREREQ_MARK (1u<<16)
 127
 128 int 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 commit *commit;
 138         int i, ret = 0, req_nr;
 139         const char *message = _("Repository lacks these prerequisite commits:");
 140
 141         init_revisions(&revs, NULL);
 142         for (i = 0; i < p->nr; i++) {
 143                 struct ref_list_entry *e = p->list + i;
 144                 struct object *o = parse_object(&e->oid);
 145                 if (o) {
 146                         o->flags |= PREREQ_MARK;
 147                         add_pending_object(&revs, o, e->name);
 148                         continue;
 149                 }
 150                 if (++ret == 1)
 151                         error("%s", message);
 152                 error("%s %s", oid_to_hex(&e->oid), e->name);
 153         }
 154         if (revs.pending.nr != p->nr)
 155                 return ret;
 156         req_nr = revs.pending.nr;
 157         setup_revisions(2, argv, &revs, NULL);
 158
 159         if (prepare_revision_walk(&revs))
 160                 die(_("revision walk setup failed"));
 161
 162         i = req_nr;
 163         while (i && (commit = get_revision(&revs)))
 164                 if (commit->object.flags & PREREQ_MARK)
 165                         i--;
 166
 167         for (i = 0; i < p->nr; i++) {
 168                 struct ref_list_entry *e = p->list + i;
 169                 struct object *o = parse_object(&e->oid);
 170                 assert(o); /* otherwise we'd have returned early */
 171                 if (o->flags & SHOWN)
 172                         continue;
 173                 if (++ret == 1)
 174                         error("%s", message);
 175                 error("%s %s", oid_to_hex(&e->oid), e->name);
 176         }
 177
 178         /* Clean up objects used, as they will be reused. */
 179         for (i = 0; i < p->nr; i++) {
 180                 struct ref_list_entry *e = p->list + i;
 181                 commit = lookup_commit_reference_gently(&e->oid, 1);
 182                 if (commit)
 183                         clear_commit_marks(commit, ALL_REV_FLAGS);
 184         }
 185
 186         if (verbose) {
 187                 struct ref_list *r;
 188
 189                 r = &header->references;
 190                 printf_ln(Q_("The bundle contains this ref:",
 191                              "The bundle contains these %d refs:",
 192                              r->nr),
 193                           r->nr);
 194                 list_refs(r, 0, NULL);
 195                 r = &header->prerequisites;
 196                 if (!r->nr) {
 197                         printf_ln(_("The bundle records a complete history."));
 198                 } else {
 199                         printf_ln(Q_("The bundle requires this ref:",
 200                                      "The bundle requires these %d refs:",
 201                                      r->nr),
 202                                   r->nr);
 203                         list_refs(r, 0, NULL);
 204                 }
 205         }
 206         return ret;
 207 }
 208
 209 int list_bundle_refs(struct bundle_header *header, int argc, const char **argv)
 210 {
 211         return list_refs(&header->references, argc, argv);
 212 }
 213
 214 static int is_tag_in_date_range(struct object *tag, struct rev_info *revs)
 215 {
 216         unsigned long size;
 217         enum object_type type;
 218         char *buf = NULL, *line, *lineend;
 219         timestamp_t date;
 220         int result = 1;
 221
 222         if (revs->max_age == -1 && revs->min_age == -1)
 223                 goto out;
 224
 225         buf = read_object_file(&tag->oid, &type, &size);
 226         if (!buf)
 227                 goto out;
 228         line = memmem(buf, size, "\ntagger ", 8);
 229         if (!line++)
 230                 goto out;
 231         lineend = memchr(line, '\n', buf + size - line);
 232         line = memchr(line, '>', lineend ? lineend - line : buf + size - line);
 233         if (!line++)
 234                 goto out;
 235         date = parse_timestamp(line, NULL, 10);
 236         result = (revs->max_age == -1 || revs->max_age < date) &&
 237                 (revs->min_age == -1 || revs->min_age > date);
 238 out:
 239         free(buf);
 240         return result;
 241 }
 242
 243
 244 /* Write the pack data to bundle_fd, then close it if it is > 1. */
 245 static int write_pack_data(int bundle_fd, struct rev_info *revs)
 246 {
 247         struct child_process pack_objects = CHILD_PROCESS_INIT;
 248         int i;
 249
 250         argv_array_pushl(&pack_objects.args,
 251                          "pack-objects", "--all-progress-implied",
 252                          "--stdout", "--thin", "--delta-base-offset",
 253                          NULL);
 254         pack_objects.in = -1;
 255         pack_objects.out = bundle_fd;
 256         pack_objects.git_cmd = 1;
 257         if (start_command(&pack_objects))
 258                 return error(_("Could not spawn pack-objects"));
 259
 260         for (i = 0; i < revs->pending.nr; i++) {
 261                 struct object *object = revs->pending.objects[i].item;
 262                 if (object->flags & UNINTERESTING)
 263                         write_or_die(pack_objects.in, "^", 1);
 264                 write_or_die(pack_objects.in, oid_to_hex(&object->oid), GIT_SHA1_HEXSZ);
 265                 write_or_die(pack_objects.in, "\n", 1);
 266         }
 267         close(pack_objects.in);
 268         if (finish_command(&pack_objects))
 269                 return error(_("pack-objects died"));
 270         return 0;
 271 }
 272
 273 static int compute_and_write_prerequisites(int bundle_fd,
 274                                            struct rev_info *revs,
 275                                            int argc, const char **argv)
 276 {
 277         struct child_process rls = CHILD_PROCESS_INIT;
 278         struct strbuf buf = STRBUF_INIT;
 279         FILE *rls_fout;
 280         int i;
 281
 282         argv_array_pushl(&rls.args,
 283                          "rev-list", "--boundary", "--pretty=oneline",
 284                          NULL);
 285         for (i = 1; i < argc; i++)
 286                 argv_array_push(&rls.args, argv[i]);
 287         rls.out = -1;
 288         rls.git_cmd = 1;
 289         if (start_command(&rls))
 290                 return -1;
 291         rls_fout = xfdopen(rls.out, "r");
 292         while (strbuf_getwholeline(&buf, rls_fout, '\n') != EOF) {
 293                 struct object_id oid;
 294                 if (buf.len > 0 && buf.buf[0] == '-') {
 295                         write_or_die(bundle_fd, buf.buf, buf.len);
 296                         if (!get_oid_hex(buf.buf + 1, &oid)) {
 297                                 struct object *object = parse_object_or_die(&oid,
 298                                                                             buf.buf);
 299                                 object->flags |= UNINTERESTING;
 300                                 add_pending_object(revs, object, buf.buf);
 301                         }
 302                 } else if (!get_oid_hex(buf.buf, &oid)) {
 303                         struct object *object = parse_object_or_die(&oid,
 304                                                                     buf.buf);
 305                         object->flags |= SHOWN;
 306                 }
 307         }
 308         strbuf_release(&buf);
 309         fclose(rls_fout);
 310         if (finish_command(&rls))
 311                 return error(_("rev-list died"));
 312         return 0;
 313 }
 314
 315 /*
 316  * Write out bundle refs based on the tips already
 317  * parsed into revs.pending. As a side effect, may
 318  * manipulate revs.pending to include additional
 319  * necessary objects (like tags).
 320  *
 321  * Returns the number of refs written, or negative
 322  * on error.
 323  */
 324 static int write_bundle_refs(int bundle_fd, struct rev_info *revs)
 325 {
 326         int i;
 327         int ref_count = 0;
 328
 329         for (i = 0; i < revs->pending.nr; i++) {
 330                 struct object_array_entry *e = revs->pending.objects + i;
 331                 struct object_id oid;
 332                 char *ref;
 333                 const char *display_ref;
 334                 int flag;
 335
 336                 if (e->item->flags & UNINTERESTING)
 337                         continue;
 338                 if (dwim_ref(e->name, strlen(e->name), &oid, &ref) != 1)
 339                         goto skip_write_ref;
 340                 if (read_ref_full(e->name, RESOLVE_REF_READING, &oid, &flag))
 341                         flag = 0;
 342                 display_ref = (flag & REF_ISSYMREF) ? e->name : ref;
 343
 344                 if (e->item->type == OBJ_TAG &&
 345                                 !is_tag_in_date_range(e->item, revs)) {
 346                         e->item->flags |= UNINTERESTING;
 347                         goto skip_write_ref;
 348                 }
 349
 350                 /*
 351                  * Make sure the refs we wrote out is correct; --max-count and
 352                  * other limiting options could have prevented all the tips
 353                  * from getting output.
 354                  *
 355                  * Non commit objects such as tags and blobs do not have
 356                  * this issue as they are not affected by those extra
 357                  * constraints.
 358                  */
 359                 if (!(e->item->flags & SHOWN) && e->item->type == OBJ_COMMIT) {
 360                         warning(_("ref '%s' is excluded by the rev-list options"),
 361                                 e->name);
 362                         goto skip_write_ref;
 363                 }
 364                 /*
 365                  * If you run "git bundle create bndl v1.0..v2.0", the
 366                  * name of the positive ref is "v2.0" but that is the
 367                  * commit that is referenced by the tag, and not the tag
 368                  * itself.
 369                  */
 370                 if (oidcmp(&oid, &e->item->oid)) {
 371                         /*
 372                          * Is this the positive end of a range expressed
 373                          * in terms of a tag (e.g. v2.0 from the range
 374                          * "v1.0..v2.0")?
 375                          */
 376                         struct commit *one = lookup_commit_reference(&oid);
 377                         struct object *obj;
 378
 379                         if (e->item == &(one->object)) {
 380                                 /*
 381                                  * Need to include e->name as an
 382                                  * independent ref to the pack-objects
 383                                  * input, so that the tag is included
 384                                  * in the output; otherwise we would
 385                                  * end up triggering "empty bundle"
 386                                  * error.
 387                                  */
 388                                 obj = parse_object_or_die(&oid, e->name);
 389                                 obj->flags |= SHOWN;
 390                                 add_pending_object(revs, obj, e->name);
 391                         }
 392                         goto skip_write_ref;
 393                 }
 394
 395                 ref_count++;
 396                 write_or_die(bundle_fd, oid_to_hex(&e->item->oid), 40);
 397                 write_or_die(bundle_fd, " ", 1);
 398                 write_or_die(bundle_fd, display_ref, strlen(display_ref));
 399                 write_or_die(bundle_fd, "\n", 1);
 400  skip_write_ref:
 401                 free(ref);
 402         }
 403
 404         /* end header */
 405         write_or_die(bundle_fd, "\n", 1);
 406         return ref_count;
 407 }
 408
 409 int create_bundle(struct bundle_header *header, const char *path,
 410                   int argc, const char **argv)
 411 {
 412         static struct lock_file lock;
 413         int bundle_fd = -1;
 414         int bundle_to_stdout;
 415         int ref_count = 0;
 416         struct rev_info revs;
 417
 418         bundle_to_stdout = !strcmp(path, "-");
 419         if (bundle_to_stdout)
 420                 bundle_fd = 1;
 421         else {
 422                 bundle_fd = hold_lock_file_for_update(&lock, path,
 423                                                       LOCK_DIE_ON_ERROR);
 424
 425                 /*
 426                  * write_pack_data() will close the fd passed to it,
 427                  * but commit_lock_file() will also try to close the
 428                  * lockfile's fd. So make a copy of the file
 429                  * descriptor to avoid trying to close it twice.
 430                  */
 431                 bundle_fd = dup(bundle_fd);
 432                 if (bundle_fd < 0)
 433                         die_errno("unable to dup file descriptor");
 434         }
 435
 436         /* write signature */
 437         write_or_die(bundle_fd, bundle_signature, strlen(bundle_signature));
 438
 439         /* init revs to list objects for pack-objects later */
 440         save_commit_buffer = 0;
 441         init_revisions(&revs, NULL);
 442
 443         /* write prerequisites */
 444         if (compute_and_write_prerequisites(bundle_fd, &revs, argc, argv))
 445                 goto err;
 446
 447         argc = setup_revisions(argc, argv, &revs, NULL);
 448
 449         if (argc > 1) {
 450                 error(_("unrecognized argument: %s"), argv[1]);
 451                 goto err;
 452         }
 453
 454         object_array_remove_duplicates(&revs.pending);
 455
 456         ref_count = write_bundle_refs(bundle_fd, &revs);
 457         if (!ref_count)
 458                 die(_("Refusing to create empty bundle."));
 459         else if (ref_count < 0)
 460                 goto err;
 461
 462         /* write pack */
 463         if (write_pack_data(bundle_fd, &revs)) {
 464                 bundle_fd = -1; /* already closed by the above call */
 465                 goto err;
 466         }
 467
 468         if (!bundle_to_stdout) {
 469                 if (commit_lock_file(&lock))
 470                         die_errno(_("cannot create '%s'"), path);
 471         }
 472         return 0;
 473 err:
 474         if (!bundle_to_stdout) {
 475                 if (0 <= bundle_fd)
 476                         close(bundle_fd);
 477                 rollback_lock_file(&lock);
 478         }
 479         return -1;
 480 }
 481
 482 int unbundle(struct bundle_header *header, int bundle_fd, int flags)
 483 {
 484         const char *argv_index_pack[] = {"index-pack",
 485                                          "--fix-thin", "--stdin", NULL, NULL};
 486         struct child_process ip = CHILD_PROCESS_INIT;
 487
 488         if (flags & BUNDLE_VERBOSE)
 489                 argv_index_pack[3] = "-v";
 490
 491         if (verify_bundle(header, 0))
 492                 return -1;
 493         ip.argv = argv_index_pack;
 494         ip.in = bundle_fd;
 495         ip.no_stdout = 1;
 496         ip.git_cmd = 1;
 497         if (run_command(&ip))
 498                 return error(_("index-pack died"));
 499         return 0;
 500 }