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", sha1_to_hex(refs.objects[i].item->sha1),
 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->sha1, &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 static int write_pack_data(int bundle_fd, struct lock_file *lock, struct rev_info *revs)
 239 {
 240         struct child_process pack_objects = CHILD_PROCESS_INIT;
 241         int i;
 242
 243         argv_array_pushl(&pack_objects.args,
 244                          "pack-objects", "--all-progress-implied",
 245                          "--stdout", "--thin", "--delta-base-offset",
 246                          NULL);
 247         pack_objects.in = -1;
 248         pack_objects.out = bundle_fd;
 249         pack_objects.git_cmd = 1;
 250         if (start_command(&pack_objects))
 251                 return error(_("Could not spawn pack-objects"));
 252
 253         /*
 254          * start_command closed bundle_fd if it was > 1
 255          * so set the lock fd to -1 so commit_lock_file()
 256          * won't fail trying to close it.
 257          */
 258         lock->fd = -1;
 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, sha1_to_hex(object->sha1), 40);
 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                 unsigned char sha1[20];
 294                 if (buf.len > 0 && buf.buf[0] == '-') {
 295                         write_or_die(bundle_fd, buf.buf, buf.len);
 296                         if (!get_sha1_hex(buf.buf + 1, sha1)) {
 297                                 struct object *object = parse_object_or_die(sha1, buf.buf);
 298                                 object->flags |= UNINTERESTING;
 299                                 add_pending_object(revs, object, buf.buf);
 300                         }
 301                 } else if (!get_sha1_hex(buf.buf, sha1)) {
 302                         struct object *object = parse_object_or_die(sha1, buf.buf);
 303                         object->flags |= SHOWN;
 304                 }
 305         }
 306         strbuf_release(&buf);
 307         fclose(rls_fout);
 308         if (finish_command(&rls))
 309                 return error(_("rev-list died"));
 310         return 0;
 311 }
 312
 313 /*
 314  * Write out bundle refs based on the tips already
 315  * parsed into revs.pending. As a side effect, may
 316  * manipulate revs.pending to include additional
 317  * necessary objects (like tags).
 318  *
 319  * Returns the number of refs written, or negative
 320  * on error.
 321  */
 322 static int write_bundle_refs(int bundle_fd, struct rev_info *revs)
 323 {
 324         int i;
 325         int ref_count = 0;
 326
 327         for (i = 0; i < revs->pending.nr; i++) {
 328                 struct object_array_entry *e = revs->pending.objects + i;
 329                 unsigned char sha1[20];
 330                 char *ref;
 331                 const char *display_ref;
 332                 int flag;
 333
 334                 if (e->item->flags & UNINTERESTING)
 335                         continue;
 336                 if (dwim_ref(e->name, strlen(e->name), sha1, &ref) != 1)
 337                         goto skip_write_ref;
 338                 if (read_ref_full(e->name, RESOLVE_REF_READING, sha1, &flag))
 339                         flag = 0;
 340                 display_ref = (flag & REF_ISSYMREF) ? e->name : ref;
 341
 342                 if (e->item->type == OBJ_TAG &&
 343                                 !is_tag_in_date_range(e->item, revs)) {
 344                         e->item->flags |= UNINTERESTING;
 345                         goto skip_write_ref;
 346                 }
 347
 348                 /*
 349                  * Make sure the refs we wrote out is correct; --max-count and
 350                  * other limiting options could have prevented all the tips
 351                  * from getting output.
 352                  *
 353                  * Non commit objects such as tags and blobs do not have
 354                  * this issue as they are not affected by those extra
 355                  * constraints.
 356                  */
 357                 if (!(e->item->flags & SHOWN) && e->item->type == OBJ_COMMIT) {
 358                         warning(_("ref '%s' is excluded by the rev-list options"),
 359                                 e->name);
 360                         goto skip_write_ref;
 361                 }
 362                 /*
 363                  * If you run "git bundle create bndl v1.0..v2.0", the
 364                  * name of the positive ref is "v2.0" but that is the
 365                  * commit that is referenced by the tag, and not the tag
 366                  * itself.
 367                  */
 368                 if (hashcmp(sha1, e->item->sha1)) {
 369                         /*
 370                          * Is this the positive end of a range expressed
 371                          * in terms of a tag (e.g. v2.0 from the range
 372                          * "v1.0..v2.0")?
 373                          */
 374                         struct commit *one = lookup_commit_reference(sha1);
 375                         struct object *obj;
 376
 377                         if (e->item == &(one->object)) {
 378                                 /*
 379                                  * Need to include e->name as an
 380                                  * independent ref to the pack-objects
 381                                  * input, so that the tag is included
 382                                  * in the output; otherwise we would
 383                                  * end up triggering "empty bundle"
 384                                  * error.
 385                                  */
 386                                 obj = parse_object_or_die(sha1, e->name);
 387                                 obj->flags |= SHOWN;
 388                                 add_pending_object(revs, obj, e->name);
 389                         }
 390                         goto skip_write_ref;
 391                 }
 392
 393                 ref_count++;
 394                 write_or_die(bundle_fd, sha1_to_hex(e->item->sha1), 40);
 395                 write_or_die(bundle_fd, " ", 1);
 396                 write_or_die(bundle_fd, display_ref, strlen(display_ref));
 397                 write_or_die(bundle_fd, "\n", 1);
 398  skip_write_ref:
 399                 free(ref);
 400         }
 401
 402         /* end header */
 403         write_or_die(bundle_fd, "\n", 1);
 404         return ref_count;
 405 }
 406
 407 int create_bundle(struct bundle_header *header, const char *path,
 408                   int argc, const char **argv)
 409 {
 410         static struct lock_file lock;
 411         int bundle_fd = -1;
 412         int bundle_to_stdout;
 413         int ref_count = 0;
 414         struct rev_info revs;
 415
 416         bundle_to_stdout = !strcmp(path, "-");
 417         if (bundle_to_stdout)
 418                 bundle_fd = 1;
 419         else
 420                 bundle_fd = hold_lock_file_for_update(&lock, path,
 421                                                       LOCK_DIE_ON_ERROR);
 422
 423         /* write signature */
 424         write_or_die(bundle_fd, bundle_signature, strlen(bundle_signature));
 425
 426         /* init revs to list objects for pack-objects later */
 427         save_commit_buffer = 0;
 428         init_revisions(&revs, NULL);
 429
 430         /* write prerequisites */
 431         if (compute_and_write_prerequisites(bundle_fd, &revs, argc, argv))
 432                 return -1;
 433
 434         argc = setup_revisions(argc, argv, &revs, NULL);
 435
 436         if (argc > 1)
 437                 return error(_("unrecognized argument: %s"), argv[1]);
 438
 439         object_array_remove_duplicates(&revs.pending);
 440
 441         ref_count = write_bundle_refs(bundle_fd, &revs);
 442         if (!ref_count)
 443                 die(_("Refusing to create empty bundle."));
 444         else if (ref_count < 0)
 445                 return -1;
 446
 447         /* write pack */
 448         if (write_pack_data(bundle_fd, &lock, &revs))
 449                 return -1;
 450
 451         if (!bundle_to_stdout) {
 452                 if (commit_lock_file(&lock))
 453                         die_errno(_("cannot create '%s'"), path);
 454         }
 455         return 0;
 456 }
 457
 458 int unbundle(struct bundle_header *header, int bundle_fd, int flags)
 459 {
 460         const char *argv_index_pack[] = {"index-pack",
 461                                          "--fix-thin", "--stdin", NULL, NULL};
 462         struct child_process ip = CHILD_PROCESS_INIT;
 463
 464         if (flags & BUNDLE_VERBOSE)
 465                 argv_index_pack[3] = "-v";
 466
 467         if (verify_bundle(header, 0))
 468                 return -1;
 469         ip.argv = argv_index_pack;
 470         ip.in = bundle_fd;
 471         ip.no_stdout = 1;
 472         ip.git_cmd = 1;
 473         if (run_command(&ip))
 474                 return error(_("index-pack died"));
 475         return 0;
 476 }