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 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->oid.hash);
 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", oid_to_hex(&e->oid), 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", oid_to_hex(&refs.objects[i].item->oid),
 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 this ref:",
 187                              "The bundle contains these %d refs:",
 188                              r->nr),
 189                           r->nr);
 190                 list_refs(r, 0, NULL);
 191                 r = &header->prerequisites;
 192                 if (!r->nr) {
 193                         printf_ln(_("The bundle records a complete history."));
 194                 } else {
 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
 205 int list_bundle_refs(struct bundle_header *header, int argc, const char **argv)
 206 {
 207         return list_refs(&header->references, argc, argv);
 208 }
 209
 210 static 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 = NULL, *line, *lineend;
 215         unsigned long date;
 216         int result = 1;
 217
 218         if (revs->max_age == -1 && revs->min_age == -1)
 219                 goto out;
 220
 221         buf = read_sha1_file(tag->oid.hash, &type, &size);
 222         if (!buf)
 223                 goto out;
 224         line = memmem(buf, size, "\ntagger ", 8);
 225         if (!line++)
 226                 goto out;
 227         lineend = memchr(line, '\n', buf + size - line);
 228         line = memchr(line, '>', lineend ? lineend - line : buf + size - line);
 229         if (!line++)
 230                 goto out;
 231         date = strtoul(line, NULL, 10);
 232         result = (revs->max_age == -1 || revs->max_age < date) &&
 233                 (revs->min_age == -1 || revs->min_age > date);
 234 out:
 235         free(buf);
 236         return result;
 237 }
 238
 239
 240 /* Write the pack data to bundle_fd, then close it if it is > 1. */
 241 static int write_pack_data(int bundle_fd, struct rev_info *revs)
 242 {
 243         struct child_process pack_objects = CHILD_PROCESS_INIT;
 244         int i;
 245
 246         argv_array_pushl(&pack_objects.args,
 247                          "pack-objects", "--all-progress-implied",
 248                          "--stdout", "--thin", "--delta-base-offset",
 249                          NULL);
 250         pack_objects.in = -1;
 251         pack_objects.out = bundle_fd;
 252         pack_objects.git_cmd = 1;
 253         if (start_command(&pack_objects))
 254                 return error(_("Could not spawn pack-objects"));
 255
 256         for (i = 0; i < revs->pending.nr; i++) {
 257                 struct object *object = revs->pending.objects[i].item;
 258                 if (object->flags & UNINTERESTING)
 259                         write_or_die(pack_objects.in, "^", 1);
 260                 write_or_die(pack_objects.in, oid_to_hex(&object->oid), GIT_SHA1_HEXSZ);
 261                 write_or_die(pack_objects.in, "\n", 1);
 262         }
 263         close(pack_objects.in);
 264         if (finish_command(&pack_objects))
 265                 return error(_("pack-objects died"));
 266         return 0;
 267 }
 268
 269 static int compute_and_write_prerequisites(int bundle_fd,
 270                                            struct rev_info *revs,
 271                                            int argc, const char **argv)
 272 {
 273         struct child_process rls = CHILD_PROCESS_INIT;
 274         struct strbuf buf = STRBUF_INIT;
 275         FILE *rls_fout;
 276         int i;
 277
 278         argv_array_pushl(&rls.args,
 279                          "rev-list", "--boundary", "--pretty=oneline",
 280                          NULL);
 281         for (i = 1; i < argc; i++)
 282                 argv_array_push(&rls.args, argv[i]);
 283         rls.out = -1;
 284         rls.git_cmd = 1;
 285         if (start_command(&rls))
 286                 return -1;
 287         rls_fout = xfdopen(rls.out, "r");
 288         while (strbuf_getwholeline(&buf, rls_fout, '\n') != EOF) {
 289                 struct object_id oid;
 290                 if (buf.len > 0 && buf.buf[0] == '-') {
 291                         write_or_die(bundle_fd, buf.buf, buf.len);
 292                         if (!get_oid_hex(buf.buf + 1, &oid)) {
 293                                 struct object *object = parse_object_or_die(oid.hash, buf.buf);
 294                                 object->flags |= UNINTERESTING;
 295                                 add_pending_object(revs, object, buf.buf);
 296                         }
 297                 } else if (!get_oid_hex(buf.buf, &oid)) {
 298                         struct object *object = parse_object_or_die(oid.hash, buf.buf);
 299                         object->flags |= SHOWN;
 300                 }
 301         }
 302         strbuf_release(&buf);
 303         fclose(rls_fout);
 304         if (finish_command(&rls))
 305                 return error(_("rev-list died"));
 306         return 0;
 307 }
 308
 309 /*
 310  * Write out bundle refs based on the tips already
 311  * parsed into revs.pending. As a side effect, may
 312  * manipulate revs.pending to include additional
 313  * necessary objects (like tags).
 314  *
 315  * Returns the number of refs written, or negative
 316  * on error.
 317  */
 318 static int write_bundle_refs(int bundle_fd, struct rev_info *revs)
 319 {
 320         int i;
 321         int ref_count = 0;
 322
 323         for (i = 0; i < revs->pending.nr; i++) {
 324                 struct object_array_entry *e = revs->pending.objects + i;
 325                 struct object_id oid;
 326                 char *ref;
 327                 const char *display_ref;
 328                 int flag;
 329
 330                 if (e->item->flags & UNINTERESTING)
 331                         continue;
 332                 if (dwim_ref(e->name, strlen(e->name), oid.hash, &ref) != 1)
 333                         goto skip_write_ref;
 334                 if (read_ref_full(e->name, RESOLVE_REF_READING, oid.hash, &flag))
 335                         flag = 0;
 336                 display_ref = (flag & REF_ISSYMREF) ? e->name : ref;
 337
 338                 if (e->item->type == OBJ_TAG &&
 339                                 !is_tag_in_date_range(e->item, revs)) {
 340                         e->item->flags |= UNINTERESTING;
 341                         goto skip_write_ref;
 342                 }
 343
 344                 /*
 345                  * Make sure the refs we wrote out is correct; --max-count and
 346                  * other limiting options could have prevented all the tips
 347                  * from getting output.
 348                  *
 349                  * Non commit objects such as tags and blobs do not have
 350                  * this issue as they are not affected by those extra
 351                  * constraints.
 352                  */
 353                 if (!(e->item->flags & SHOWN) && e->item->type == OBJ_COMMIT) {
 354                         warning(_("ref '%s' is excluded by the rev-list options"),
 355                                 e->name);
 356                         goto skip_write_ref;
 357                 }
 358                 /*
 359                  * If you run "git bundle create bndl v1.0..v2.0", the
 360                  * name of the positive ref is "v2.0" but that is the
 361                  * commit that is referenced by the tag, and not the tag
 362                  * itself.
 363                  */
 364                 if (oidcmp(&oid, &e->item->oid)) {
 365                         /*
 366                          * Is this the positive end of a range expressed
 367                          * in terms of a tag (e.g. v2.0 from the range
 368                          * "v1.0..v2.0")?
 369                          */
 370                         struct commit *one = lookup_commit_reference(&oid);
 371                         struct object *obj;
 372
 373                         if (e->item == &(one->object)) {
 374                                 /*
 375                                  * Need to include e->name as an
 376                                  * independent ref to the pack-objects
 377                                  * input, so that the tag is included
 378                                  * in the output; otherwise we would
 379                                  * end up triggering "empty bundle"
 380                                  * error.
 381                                  */
 382                                 obj = parse_object_or_die(oid.hash, e->name);
 383                                 obj->flags |= SHOWN;
 384                                 add_pending_object(revs, obj, e->name);
 385                         }
 386                         goto skip_write_ref;
 387                 }
 388
 389                 ref_count++;
 390                 write_or_die(bundle_fd, oid_to_hex(&e->item->oid), 40);
 391                 write_or_die(bundle_fd, " ", 1);
 392                 write_or_die(bundle_fd, display_ref, strlen(display_ref));
 393                 write_or_die(bundle_fd, "\n", 1);
 394  skip_write_ref:
 395                 free(ref);
 396         }
 397
 398         /* end header */
 399         write_or_die(bundle_fd, "\n", 1);
 400         return ref_count;
 401 }
 402
 403 int create_bundle(struct bundle_header *header, const char *path,
 404                   int argc, const char **argv)
 405 {
 406         static struct lock_file lock;
 407         int bundle_fd = -1;
 408         int bundle_to_stdout;
 409         int ref_count = 0;
 410         struct rev_info revs;
 411
 412         bundle_to_stdout = !strcmp(path, "-");
 413         if (bundle_to_stdout)
 414                 bundle_fd = 1;
 415         else {
 416                 bundle_fd = hold_lock_file_for_update(&lock, path,
 417                                                       LOCK_DIE_ON_ERROR);
 418
 419                 /*
 420                  * write_pack_data() will close the fd passed to it,
 421                  * but commit_lock_file() will also try to close the
 422                  * lockfile's fd. So make a copy of the file
 423                  * descriptor to avoid trying to close it twice.
 424                  */
 425                 bundle_fd = dup(bundle_fd);
 426                 if (bundle_fd < 0)
 427                         die_errno("unable to dup file descriptor");
 428         }
 429
 430         /* write signature */
 431         write_or_die(bundle_fd, bundle_signature, strlen(bundle_signature));
 432
 433         /* init revs to list objects for pack-objects later */
 434         save_commit_buffer = 0;
 435         init_revisions(&revs, NULL);
 436
 437         /* write prerequisites */
 438         if (compute_and_write_prerequisites(bundle_fd, &revs, argc, argv))
 439                 goto err;
 440
 441         argc = setup_revisions(argc, argv, &revs, NULL);
 442
 443         if (argc > 1) {
 444                 error(_("unrecognized argument: %s"), argv[1]);
 445                 goto err;
 446         }
 447
 448         object_array_remove_duplicates(&revs.pending);
 449
 450         ref_count = write_bundle_refs(bundle_fd, &revs);
 451         if (!ref_count)
 452                 die(_("Refusing to create empty bundle."));
 453         else if (ref_count < 0)
 454                 goto err;
 455
 456         /* write pack */
 457         if (write_pack_data(bundle_fd, &revs)) {
 458                 bundle_fd = -1; /* already closed by the above call */
 459                 goto err;
 460         }
 461
 462         if (!bundle_to_stdout) {
 463                 if (commit_lock_file(&lock))
 464                         die_errno(_("cannot create '%s'"), path);
 465         }
 466         return 0;
 467 err:
 468         if (!bundle_to_stdout) {
 469                 if (0 <= bundle_fd)
 470                         close(bundle_fd);
 471                 rollback_lock_file(&lock);
 472         }
 473         return -1;
 474 }
 475
 476 int unbundle(struct bundle_header *header, int bundle_fd, int flags)
 477 {
 478         const char *argv_index_pack[] = {"index-pack",
 479                                          "--fix-thin", "--stdin", NULL, NULL};
 480         struct child_process ip = CHILD_PROCESS_INIT;
 481
 482         if (flags & BUNDLE_VERBOSE)
 483                 argv_index_pack[3] = "-v";
 484
 485         if (verify_bundle(header, 0))
 486                 return -1;
 487         ip.argv = argv_index_pack;
 488         ip.in = bundle_fd;
 489         ip.no_stdout = 1;
 490         ip.git_cmd = 1;
 491         if (run_command(&ip))
 492                 return error(_("index-pack died"));
 493         return 0;
 494 }