bundle.c

   1 #include "cache.h"
   2 #include "bundle.h"
   3 #include "object.h"
   4 #include "commit.h"
   5 #include "diff.h"
   6 #include "revision.h"
   7 #include "list-objects.h"
   8 #include "run-command.h"
   9 #include "refs.h"
  10
  11 static const char bundle_signature[] = "# v2 git bundle\n";
  12
  13 static void add_to_ref_list(const unsigned char *sha1, const char *name,
  14                 struct ref_list *list)
  15 {
  16         if (list->nr + 1 >= list->alloc) {
  17                 list->alloc = alloc_nr(list->nr + 1);
  18                 list->list = xrealloc(list->list,
  19                                 list->alloc * sizeof(list->list[0]));
  20         }
  21         memcpy(list->list[list->nr].sha1, sha1, 20);
  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                 unsigned char sha1[20];
  46                 int is_prereq = 0;
  47
  48                 if (*buf.buf == '-') {
  49                         is_prereq = 1;
  50                         strbuf_remove(&buf, 0, 1);
  51                 }
  52                 strbuf_rtrim(&buf);
  53
  54                 /*
  55                  * Tip lines have object name, SP, and refname.
  56                  * Prerequisites have object name that is optionally
  57                  * followed by SP and subject line.
  58                  */
  59                 if (get_sha1_hex(buf.buf, sha1) ||
  60                     (40 <= buf.len && !isspace(buf.buf[40])) ||
  61                     (!is_prereq && buf.len <= 40)) {
  62                         if (report_path)
  63                                 error(_("unrecognized header: %s%s (%d)"),
  64                                       (is_prereq ? "-" : ""), buf.buf, (int)buf.len);
  65                         status = -1;
  66                         break;
  67                 } else {
  68                         if (is_prereq)
  69                                 add_to_ref_list(sha1, "", &header->prerequisites);
  70                         else
  71                                 add_to_ref_list(sha1, buf.buf + 41, &header->references);
  72                 }
  73         }
  74
  75  abort:
  76         if (status) {
  77                 close(fd);
  78                 fd = -1;
  79         }
  80         strbuf_release(&buf);
  81         return fd;
  82 }
  83
  84 int read_bundle_header(const char *path, struct bundle_header *header)
  85 {
  86         int fd = open(path, O_RDONLY);
  87
  88         if (fd < 0)
  89                 return error(_("could not open '%s'"), path);
  90         return parse_bundle_header(fd, header, path);
  91 }
  92
  93 int is_bundle(const char *path, int quiet)
  94 {
  95         struct bundle_header header;
  96         int fd = open(path, O_RDONLY);
  97
  98         if (fd < 0)
  99                 return 0;
 100         memset(&header, 0, sizeof(header));
 101         fd = parse_bundle_header(fd, &header, quiet ? NULL : path);
 102         if (fd >= 0)
 103                 close(fd);
 104         return (fd >= 0);
 105 }
 106
 107 static int list_refs(struct ref_list *r, int argc, const char **argv)
 108 {
 109         int i;
 110
 111         for (i = 0; i < r->nr; i++) {
 112                 if (argc > 1) {
 113                         int j;
 114                         for (j = 1; j < argc; j++)
 115                                 if (!strcmp(r->list[i].name, argv[j]))
 116                                         break;
 117                         if (j == argc)
 118                                 continue;
 119                 }
 120                 printf("%s %s\n", sha1_to_hex(r->list[i].sha1),
 121                                 r->list[i].name);
 122         }
 123         return 0;
 124 }
 125
 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->sha1);
 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", sha1_to_hex(e->sha1), 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", sha1_to_hex(refs.objects[i].item->sha1),
 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 %d ref",
 187                              "The bundle contains %d refs",
 188                              r->nr),
 189                           r->nr);
 190                 list_refs(r, 0, NULL);
 191                 if (!r->nr) {
 192                         printf_ln(_("The bundle records a complete history."));
 193                 } else {
 194                         r = &header->prerequisites;
 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, *line, *lineend;
 215         unsigned long date;
 216
 217         if (revs->max_age == -1 && revs->min_age == -1)
 218                 return 1;
 219
 220         buf = read_sha1_file(tag->sha1, &type, &size);
 221         if (!buf)
 222                 return 1;
 223         line = memmem(buf, size, "\ntagger ", 8);
 224         if (!line++)
 225                 return 1;
 226         lineend = memchr(line, buf + size - line, '\n');
 227         line = memchr(line, lineend ? lineend - line : buf + size - line, '>');
 228         if (!line++)
 229                 return 1;
 230         date = strtoul(line, NULL, 10);
 231         free(buf);
 232         return (revs->max_age == -1 || revs->max_age < date) &&
 233                 (revs->min_age == -1 || revs->min_age > date);
 234 }
 235
 236 int create_bundle(struct bundle_header *header, const char *path,
 237                 int argc, const char **argv)
 238 {
 239         static struct lock_file lock;
 240         int bundle_fd = -1;
 241         int bundle_to_stdout;
 242         const char **argv_boundary = xmalloc((argc + 4) * sizeof(const char *));
 243         const char **argv_pack = xmalloc(6 * sizeof(const char *));
 244         int i, ref_count = 0;
 245         struct strbuf buf = STRBUF_INIT;
 246         struct rev_info revs;
 247         struct child_process rls;
 248         FILE *rls_fout;
 249
 250         bundle_to_stdout = !strcmp(path, "-");
 251         if (bundle_to_stdout)
 252                 bundle_fd = 1;
 253         else
 254                 bundle_fd = hold_lock_file_for_update(&lock, path,
 255                                                       LOCK_DIE_ON_ERROR);
 256
 257         /* write signature */
 258         write_or_die(bundle_fd, bundle_signature, strlen(bundle_signature));
 259
 260         /* init revs to list objects for pack-objects later */
 261         save_commit_buffer = 0;
 262         init_revisions(&revs, NULL);
 263
 264         /* write prerequisites */
 265         memcpy(argv_boundary + 3, argv + 1, argc * sizeof(const char *));
 266         argv_boundary[0] = "rev-list";
 267         argv_boundary[1] = "--boundary";
 268         argv_boundary[2] = "--pretty=oneline";
 269         argv_boundary[argc + 2] = NULL;
 270         memset(&rls, 0, sizeof(rls));
 271         rls.argv = argv_boundary;
 272         rls.out = -1;
 273         rls.git_cmd = 1;
 274         if (start_command(&rls))
 275                 return -1;
 276         rls_fout = xfdopen(rls.out, "r");
 277         while (strbuf_getwholeline(&buf, rls_fout, '\n') != EOF) {
 278                 unsigned char sha1[20];
 279                 if (buf.len > 0 && buf.buf[0] == '-') {
 280                         write_or_die(bundle_fd, buf.buf, buf.len);
 281                         if (!get_sha1_hex(buf.buf + 1, sha1)) {
 282                                 struct object *object = parse_object(sha1);
 283                                 object->flags |= UNINTERESTING;
 284                                 add_pending_object(&revs, object, xstrdup(buf.buf));
 285                         }
 286                 } else if (!get_sha1_hex(buf.buf, sha1)) {
 287                         struct object *object = parse_object(sha1);
 288                         object->flags |= SHOWN;
 289                 }
 290         }
 291         strbuf_release(&buf);
 292         fclose(rls_fout);
 293         if (finish_command(&rls))
 294                 return error(_("rev-list died"));
 295
 296         /* write references */
 297         argc = setup_revisions(argc, argv, &revs, NULL);
 298
 299         if (argc > 1)
 300                 return error(_("unrecognized argument: %s"), argv[1]);
 301
 302         object_array_remove_duplicates(&revs.pending);
 303
 304         for (i = 0; i < revs.pending.nr; i++) {
 305                 struct object_array_entry *e = revs.pending.objects + i;
 306                 unsigned char sha1[20];
 307                 char *ref;
 308                 const char *display_ref;
 309                 int flag;
 310
 311                 if (e->item->flags & UNINTERESTING)
 312                         continue;
 313                 if (dwim_ref(e->name, strlen(e->name), sha1, &ref) != 1)
 314                         continue;
 315                 if (read_ref_full(e->name, sha1, 1, &flag))
 316                         flag = 0;
 317                 display_ref = (flag & REF_ISSYMREF) ? e->name : ref;
 318
 319                 if (e->item->type == OBJ_TAG &&
 320                                 !is_tag_in_date_range(e->item, &revs)) {
 321                         e->item->flags |= UNINTERESTING;
 322                         continue;
 323                 }
 324
 325                 /*
 326                  * Make sure the refs we wrote out is correct; --max-count and
 327                  * other limiting options could have prevented all the tips
 328                  * from getting output.
 329                  *
 330                  * Non commit objects such as tags and blobs do not have
 331                  * this issue as they are not affected by those extra
 332                  * constraints.
 333                  */
 334                 if (!(e->item->flags & SHOWN) && e->item->type == OBJ_COMMIT) {
 335                         warning(_("ref '%s' is excluded by the rev-list options"),
 336                                 e->name);
 337                         free(ref);
 338                         continue;
 339                 }
 340                 /*
 341                  * If you run "git bundle create bndl v1.0..v2.0", the
 342                  * name of the positive ref is "v2.0" but that is the
 343                  * commit that is referenced by the tag, and not the tag
 344                  * itself.
 345                  */
 346                 if (hashcmp(sha1, e->item->sha1)) {
 347                         /*
 348                          * Is this the positive end of a range expressed
 349                          * in terms of a tag (e.g. v2.0 from the range
 350                          * "v1.0..v2.0")?
 351                          */
 352                         struct commit *one = lookup_commit_reference(sha1);
 353                         struct object *obj;
 354
 355                         if (e->item == &(one->object)) {
 356                                 /*
 357                                  * Need to include e->name as an
 358                                  * independent ref to the pack-objects
 359                                  * input, so that the tag is included
 360                                  * in the output; otherwise we would
 361                                  * end up triggering "empty bundle"
 362                                  * error.
 363                                  */
 364                                 obj = parse_object(sha1);
 365                                 obj->flags |= SHOWN;
 366                                 add_pending_object(&revs, obj, e->name);
 367                         }
 368                         free(ref);
 369                         continue;
 370                 }
 371
 372                 ref_count++;
 373                 write_or_die(bundle_fd, sha1_to_hex(e->item->sha1), 40);
 374                 write_or_die(bundle_fd, " ", 1);
 375                 write_or_die(bundle_fd, display_ref, strlen(display_ref));
 376                 write_or_die(bundle_fd, "\n", 1);
 377                 free(ref);
 378         }
 379         if (!ref_count)
 380                 die(_("Refusing to create empty bundle."));
 381
 382         /* end header */
 383         write_or_die(bundle_fd, "\n", 1);
 384
 385         /* write pack */
 386         argv_pack[0] = "pack-objects";
 387         argv_pack[1] = "--all-progress-implied";
 388         argv_pack[2] = "--stdout";
 389         argv_pack[3] = "--thin";
 390         argv_pack[4] = "--delta-base-offset";
 391         argv_pack[5] = NULL;
 392         memset(&rls, 0, sizeof(rls));
 393         rls.argv = argv_pack;
 394         rls.in = -1;
 395         rls.out = bundle_fd;
 396         rls.git_cmd = 1;
 397         if (start_command(&rls))
 398                 return error(_("Could not spawn pack-objects"));
 399
 400         /*
 401          * start_command closed bundle_fd if it was > 1
 402          * so set the lock fd to -1 so commit_lock_file()
 403          * won't fail trying to close it.
 404          */
 405         lock.fd = -1;
 406
 407         for (i = 0; i < revs.pending.nr; i++) {
 408                 struct object *object = revs.pending.objects[i].item;
 409                 if (object->flags & UNINTERESTING)
 410                         write_or_die(rls.in, "^", 1);
 411                 write_or_die(rls.in, sha1_to_hex(object->sha1), 40);
 412                 write_or_die(rls.in, "\n", 1);
 413         }
 414         close(rls.in);
 415         if (finish_command(&rls))
 416                 return error(_("pack-objects died"));
 417         if (!bundle_to_stdout) {
 418                 if (commit_lock_file(&lock))
 419                         die_errno(_("cannot create '%s'"), path);
 420         }
 421         return 0;
 422 }
 423
 424 int unbundle(struct bundle_header *header, int bundle_fd, int flags)
 425 {
 426         const char *argv_index_pack[] = {"index-pack",
 427                                          "--fix-thin", "--stdin", NULL, NULL};
 428         struct child_process ip;
 429
 430         if (flags & BUNDLE_VERBOSE)
 431                 argv_index_pack[3] = "-v";
 432
 433         if (verify_bundle(header, 0))
 434                 return -1;
 435         memset(&ip, 0, sizeof(ip));
 436         ip.argv = argv_index_pack;
 437         ip.in = bundle_fd;
 438         ip.no_stdout = 1;
 439         ip.git_cmd = 1;
 440         if (run_command(&ip))
 441                 return error(_("index-pack died"));
 442         return 0;
 443 }