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 unsigned char *sha1, const char *name,
  16                 struct ref_list *list)
  17 {
  18         ALLOC_GROW(list->list, list->nr + 1, list->alloc);
  19         hashcpy(list->list[list->nr].sha1, sha1);
  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                 unsigned char sha1[20];
  44                 int is_prereq = 0;
  45
  46                 if (*buf.buf == '-') {
  47                         is_prereq = 1;
  48                         strbuf_remove(&buf, 0, 1);
  49                 }
  50                 strbuf_rtrim(&buf);
  51
  52                 /*
  53                  * Tip lines have object name, SP, and refname.
  54                  * Prerequisites have object name that is optionally
  55                  * followed by SP and subject line.
  56                  */
  57                 if (get_sha1_hex(buf.buf, sha1) ||
  58                     (buf.len > 40 && !isspace(buf.buf[40])) ||
  59                     (!is_prereq && buf.len <= 40)) {
  60                         if (report_path)
  61                                 error(_("unrecognized header: %s%s (%d)"),
  62                                       (is_prereq ? "-" : ""), buf.buf, (int)buf.len);
  63                         status = -1;
  64                         break;
  65                 } else {
  66                         if (is_prereq)
  67                                 add_to_ref_list(sha1, "", &header->prerequisites);
  68                         else
  69                                 add_to_ref_list(sha1, buf.buf + 41, &header->references);
  70                 }
  71         }
  72
  73  abort:
  74         if (status) {
  75                 close(fd);
  76                 fd = -1;
  77         }
  78         strbuf_release(&buf);
  79         return fd;
  80 }
  81
  82 int read_bundle_header(const char *path, struct bundle_header *header)
  83 {
  84         int fd = open(path, O_RDONLY);
  85
  86         if (fd < 0)
  87                 return error(_("could not open '%s'"), path);
  88         return parse_bundle_header(fd, header, path);
  89 }
  90
  91 int is_bundle(const char *path, int quiet)
  92 {
  93         struct bundle_header header;
  94         int fd = open(path, O_RDONLY);
  95
  96         if (fd < 0)
  97                 return 0;
  98         memset(&header, 0, sizeof(header));
  99         fd = parse_bundle_header(fd, &header, quiet ? NULL : path);
 100         if (fd >= 0)
 101                 close(fd);
 102         return (fd >= 0);
 103 }
 104
 105 static int list_refs(struct ref_list *r, int argc, const char **argv)
 106 {
 107         int i;
 108
 109         for (i = 0; i < r->nr; i++) {
 110                 if (argc > 1) {
 111                         int j;
 112                         for (j = 1; j < argc; j++)
 113                                 if (!strcmp(r->list[i].name, argv[j]))
 114                                         break;
 115                         if (j == argc)
 116                                 continue;
 117                 }
 118                 printf("%s %s\n", sha1_to_hex(r->list[i].sha1),
 119                                 r->list[i].name);
 120         }
 121         return 0;
 122 }
 123
 124 /* Remember to update object flag allocation in object.h */
 125 #define PREREQ_MARK (1u<<16)
 126
 127 int verify_bundle(struct bundle_header *header, int verbose)
 128 {
 129         /*
 130          * Do fast check, then if any prereqs are missing then go line by line
 131          * to be verbose about the errors
 132          */
 133         struct ref_list *p = &header->prerequisites;
 134         struct rev_info revs;
 135         const char *argv[] = {NULL, "--all", NULL};
 136         struct object_array refs;
 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->sha1);
 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", sha1_to_hex(e->sha1), 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         refs = revs.pending;
 160         revs.leak_pending = 1;
 161
 162         if (prepare_revision_walk(&revs))
 163                 die(_("revision walk setup failed"));
 164
 165         i = req_nr;
 166         while (i && (commit = get_revision(&revs)))
 167                 if (commit->object.flags & PREREQ_MARK)
 168                         i--;
 169
 170         for (i = 0; i < req_nr; i++)
 171                 if (!(refs.objects[i].item->flags & SHOWN)) {
 172                         if (++ret == 1)
 173                                 error("%s", message);
 174                         error("%s %s", oid_to_hex(&refs.objects[i].item->oid),
 175                                 refs.objects[i].name);
 176                 }
 177
 178         clear_commit_marks_for_object_array(&refs, ALL_REV_FLAGS);
 179         free(refs.objects);
 180
 181         if (verbose) {
 182                 struct ref_list *r;
 183
 184                 r = &header->references;
 185                 printf_ln(Q_("The bundle contains this ref:",
 186                              "The bundle contains these %d refs:",
 187                              r->nr),
 188                           r->nr);
 189                 list_refs(r, 0, NULL);
 190                 r = &header->prerequisites;
 191                 if (!r->nr) {
 192                         printf_ln(_("The bundle records a complete history."));
 193                 } else {
 194                         printf_ln(Q_("The bundle requires this ref:",
 195                                      "The bundle requires these %d refs:",
 196                                      r->nr),
 197                                   r->nr);
 198                         list_refs(r, 0, NULL);
 199                 }
 200         }
 201         return ret;
 202 }
 203
 204 int list_bundle_refs(struct bundle_header *header, int argc, const char **argv)
 205 {
 206         return list_refs(&header->references, argc, argv);
 207 }
 208
 209 static int is_tag_in_date_range(struct object *tag, struct rev_info *revs)
 210 {
 211         unsigned long size;
 212         enum object_type type;
 213         char *buf = NULL, *line, *lineend;
 214         unsigned long date;
 215         int result = 1;
 216
 217         if (revs->max_age == -1 && revs->min_age == -1)
 218                 goto out;
 219
 220         buf = read_sha1_file(tag->oid.hash, &type, &size);
 221         if (!buf)
 222                 goto out;
 223         line = memmem(buf, size, "\ntagger ", 8);
 224         if (!line++)
 225                 goto out;
 226         lineend = memchr(line, '\n', buf + size - line);
 227         line = memchr(line, '>', lineend ? lineend - line : buf + size - line);
 228         if (!line++)
 229                 goto out;
 230         date = strtoul(line, NULL, 10);
 231         result = (revs->max_age == -1 || revs->max_age < date) &&
 232                 (revs->min_age == -1 || revs->min_age > date);
 233 out:
 234         free(buf);
 235         return result;
 236 }
 237
 238
 239 /* Write the pack data to bundle_fd, then close it if it is > 1. */
 240 static int write_pack_data(int bundle_fd, struct rev_info *revs)
 241 {
 242         struct child_process pack_objects = CHILD_PROCESS_INIT;
 243         int i;
 244
 245         argv_array_pushl(&pack_objects.args,
 246                          "pack-objects", "--all-progress-implied",
 247                          "--stdout", "--thin", "--delta-base-offset",
 248                          NULL);
 249         pack_objects.in = -1;
 250         pack_objects.out = bundle_fd;
 251         pack_objects.git_cmd = 1;
 252         if (start_command(&pack_objects))
 253                 return error(_("Could not spawn pack-objects"));
 254
 255         for (i = 0; i < revs->pending.nr; i++) {
 256                 struct object *object = revs->pending.objects[i].item;
 257                 if (object->flags & UNINTERESTING)
 258                         write_or_die(pack_objects.in, "^", 1);
 259                 write_or_die(pack_objects.in, oid_to_hex(&object->oid), GIT_SHA1_HEXSZ);
 260                 write_or_die(pack_objects.in, "\n", 1);
 261         }
 262         close(pack_objects.in);
 263         if (finish_command(&pack_objects))
 264                 return error(_("pack-objects died"));
 265         return 0;
 266 }
 267
 268 static int compute_and_write_prerequisites(int bundle_fd,
 269                                            struct rev_info *revs,
 270                                            int argc, const char **argv)
 271 {
 272         struct child_process rls = CHILD_PROCESS_INIT;
 273         struct strbuf buf = STRBUF_INIT;
 274         FILE *rls_fout;
 275         int i;
 276
 277         argv_array_pushl(&rls.args,
 278                          "rev-list", "--boundary", "--pretty=oneline",
 279                          NULL);
 280         for (i = 1; i < argc; i++)
 281                 argv_array_push(&rls.args, argv[i]);
 282         rls.out = -1;
 283         rls.git_cmd = 1;
 284         if (start_command(&rls))
 285                 return -1;
 286         rls_fout = xfdopen(rls.out, "r");
 287         while (strbuf_getwholeline(&buf, rls_fout, '\n') != EOF) {
 288                 unsigned char sha1[20];
 289                 if (buf.len > 0 && buf.buf[0] == '-') {
 290                         write_or_die(bundle_fd, buf.buf, buf.len);
 291                         if (!get_sha1_hex(buf.buf + 1, sha1)) {
 292                                 struct object *object = parse_object_or_die(sha1, buf.buf);
 293                                 object->flags |= UNINTERESTING;
 294                                 add_pending_object(revs, object, buf.buf);
 295                         }
 296                 } else if (!get_sha1_hex(buf.buf, sha1)) {
 297                         struct object *object = parse_object_or_die(sha1, buf.buf);
 298                         object->flags |= SHOWN;
 299                 }
 300         }
 301         strbuf_release(&buf);
 302         fclose(rls_fout);
 303         if (finish_command(&rls))
 304                 return error(_("rev-list died"));
 305         return 0;
 306 }
 307
 308 /*
 309  * Write out bundle refs based on the tips already
 310  * parsed into revs.pending. As a side effect, may
 311  * manipulate revs.pending to include additional
 312  * necessary objects (like tags).
 313  *
 314  * Returns the number of refs written, or negative
 315  * on error.
 316  */
 317 static int write_bundle_refs(int bundle_fd, struct rev_info *revs)
 318 {
 319         int i;
 320         int ref_count = 0;
 321
 322         for (i = 0; i < revs->pending.nr; i++) {
 323                 struct object_array_entry *e = revs->pending.objects + i;
 324                 struct object_id oid;
 325                 char *ref;
 326                 const char *display_ref;
 327                 int flag;
 328
 329                 if (e->item->flags & UNINTERESTING)
 330                         continue;
 331                 if (dwim_ref(e->name, strlen(e->name), oid.hash, &ref) != 1)
 332                         goto skip_write_ref;
 333                 if (read_ref_full(e->name, RESOLVE_REF_READING, oid.hash, &flag))
 334                         flag = 0;
 335                 display_ref = (flag & REF_ISSYMREF) ? e->name : ref;
 336
 337                 if (e->item->type == OBJ_TAG &&
 338                                 !is_tag_in_date_range(e->item, revs)) {
 339                         e->item->flags |= UNINTERESTING;
 340                         goto skip_write_ref;
 341                 }
 342
 343                 /*
 344                  * Make sure the refs we wrote out is correct; --max-count and
 345                  * other limiting options could have prevented all the tips
 346                  * from getting output.
 347                  *
 348                  * Non commit objects such as tags and blobs do not have
 349                  * this issue as they are not affected by those extra
 350                  * constraints.
 351                  */
 352                 if (!(e->item->flags & SHOWN) && e->item->type == OBJ_COMMIT) {
 353                         warning(_("ref '%s' is excluded by the rev-list options"),
 354                                 e->name);
 355                         goto skip_write_ref;
 356                 }
 357                 /*
 358                  * If you run "git bundle create bndl v1.0..v2.0", the
 359                  * name of the positive ref is "v2.0" but that is the
 360                  * commit that is referenced by the tag, and not the tag
 361                  * itself.
 362                  */
 363                 if (oidcmp(&oid, &e->item->oid)) {
 364                         /*
 365                          * Is this the positive end of a range expressed
 366                          * in terms of a tag (e.g. v2.0 from the range
 367                          * "v1.0..v2.0")?
 368                          */
 369                         struct commit *one = lookup_commit_reference(oid.hash);
 370                         struct object *obj;
 371
 372                         if (e->item == &(one->object)) {
 373                                 /*
 374                                  * Need to include e->name as an
 375                                  * independent ref to the pack-objects
 376                                  * input, so that the tag is included
 377                                  * in the output; otherwise we would
 378                                  * end up triggering "empty bundle"
 379                                  * error.
 380                                  */
 381                                 obj = parse_object_or_die(oid.hash, e->name);
 382                                 obj->flags |= SHOWN;
 383                                 add_pending_object(revs, obj, e->name);
 384                         }
 385                         goto skip_write_ref;
 386                 }
 387
 388                 ref_count++;
 389                 write_or_die(bundle_fd, oid_to_hex(&e->item->oid), 40);
 390                 write_or_die(bundle_fd, " ", 1);
 391                 write_or_die(bundle_fd, display_ref, strlen(display_ref));
 392                 write_or_die(bundle_fd, "\n", 1);
 393  skip_write_ref:
 394                 free(ref);
 395         }
 396
 397         /* end header */
 398         write_or_die(bundle_fd, "\n", 1);
 399         return ref_count;
 400 }
 401
 402 int create_bundle(struct bundle_header *header, const char *path,
 403                   int argc, const char **argv)
 404 {
 405         static struct lock_file lock;
 406         int bundle_fd = -1;
 407         int bundle_to_stdout;
 408         int ref_count = 0;
 409         struct rev_info revs;
 410
 411         bundle_to_stdout = !strcmp(path, "-");
 412         if (bundle_to_stdout)
 413                 bundle_fd = 1;
 414         else {
 415                 bundle_fd = hold_lock_file_for_update(&lock, path,
 416                                                       LOCK_DIE_ON_ERROR);
 417
 418                 /*
 419                  * write_pack_data() will close the fd passed to it,
 420                  * but commit_lock_file() will also try to close the
 421                  * lockfile's fd. So make a copy of the file
 422                  * descriptor to avoid trying to close it twice.
 423                  */
 424                 bundle_fd = dup(bundle_fd);
 425                 if (bundle_fd < 0)
 426                         die_errno("unable to dup file descriptor");
 427         }
 428
 429         /* write signature */
 430         write_or_die(bundle_fd, bundle_signature, strlen(bundle_signature));
 431
 432         /* init revs to list objects for pack-objects later */
 433         save_commit_buffer = 0;
 434         init_revisions(&revs, NULL);
 435
 436         /* write prerequisites */
 437         if (compute_and_write_prerequisites(bundle_fd, &revs, argc, argv))
 438                 goto err;
 439
 440         argc = setup_revisions(argc, argv, &revs, NULL);
 441
 442         if (argc > 1) {
 443                 error(_("unrecognized argument: %s"), argv[1]);
 444                 goto err;
 445         }
 446
 447         object_array_remove_duplicates(&revs.pending);
 448
 449         ref_count = write_bundle_refs(bundle_fd, &revs);
 450         if (!ref_count)
 451                 die(_("Refusing to create empty bundle."));
 452         else if (ref_count < 0)
 453                 goto err;
 454
 455         /* write pack */
 456         if (write_pack_data(bundle_fd, &revs)) {
 457                 bundle_fd = -1; /* already closed by the above call */
 458                 goto err;
 459         }
 460
 461         if (!bundle_to_stdout) {
 462                 if (commit_lock_file(&lock))
 463                         die_errno(_("cannot create '%s'"), path);
 464         }
 465         return 0;
 466 err:
 467         if (!bundle_to_stdout) {
 468                 if (0 <= bundle_fd)
 469                         close(bundle_fd);
 470                 rollback_lock_file(&lock);
 471         }
 472         return -1;
 473 }
 474
 475 int unbundle(struct bundle_header *header, int bundle_fd, int flags)
 476 {
 477         const char *argv_index_pack[] = {"index-pack",
 478                                          "--fix-thin", "--stdin", NULL, NULL};
 479         struct child_process ip = CHILD_PROCESS_INIT;
 480
 481         if (flags & BUNDLE_VERBOSE)
 482                 argv_index_pack[3] = "-v";
 483
 484         if (verify_bundle(header, 0))
 485                 return -1;
 486         ip.argv = argv_index_pack;
 487         ip.in = bundle_fd;
 488         ip.no_stdout = 1;
 489         ip.git_cmd = 1;
 490         if (run_command(&ip))
 491                 return error(_("index-pack died"));
 492         return 0;
 493 }