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("The bundle contains %d ref%s\n",
 187                        r->nr, (1 < r->nr) ? "s" : "");
 188                 list_refs(r, 0, NULL);
 189                 r = &header->prerequisites;
 190                 printf("The bundle requires these %d ref%s\n",
 191                        r->nr, (1 < r->nr) ? "s" : "");
 192                 list_refs(r, 0, NULL);
 193         }
 194         return ret;
 195 }
 196
 197 int list_bundle_refs(struct bundle_header *header, int argc, const char **argv)
 198 {
 199         return list_refs(&header->references, argc, argv);
 200 }
 201
 202 static int is_tag_in_date_range(struct object *tag, struct rev_info *revs)
 203 {
 204         unsigned long size;
 205         enum object_type type;
 206         char *buf, *line, *lineend;
 207         unsigned long date;
 208
 209         if (revs->max_age == -1 && revs->min_age == -1)
 210                 return 1;
 211
 212         buf = read_sha1_file(tag->sha1, &type, &size);
 213         if (!buf)
 214                 return 1;
 215         line = memmem(buf, size, "\ntagger ", 8);
 216         if (!line++)
 217                 return 1;
 218         lineend = memchr(line, buf + size - line, '\n');
 219         line = memchr(line, lineend ? lineend - line : buf + size - line, '>');
 220         if (!line++)
 221                 return 1;
 222         date = strtoul(line, NULL, 10);
 223         free(buf);
 224         return (revs->max_age == -1 || revs->max_age < date) &&
 225                 (revs->min_age == -1 || revs->min_age > date);
 226 }
 227
 228 int create_bundle(struct bundle_header *header, const char *path,
 229                 int argc, const char **argv)
 230 {
 231         static struct lock_file lock;
 232         int bundle_fd = -1;
 233         int bundle_to_stdout;
 234         const char **argv_boundary = xmalloc((argc + 4) * sizeof(const char *));
 235         const char **argv_pack = xmalloc(6 * sizeof(const char *));
 236         int i, ref_count = 0;
 237         struct strbuf buf = STRBUF_INIT;
 238         struct rev_info revs;
 239         struct child_process rls;
 240         FILE *rls_fout;
 241
 242         bundle_to_stdout = !strcmp(path, "-");
 243         if (bundle_to_stdout)
 244                 bundle_fd = 1;
 245         else
 246                 bundle_fd = hold_lock_file_for_update(&lock, path,
 247                                                       LOCK_DIE_ON_ERROR);
 248
 249         /* write signature */
 250         write_or_die(bundle_fd, bundle_signature, strlen(bundle_signature));
 251
 252         /* init revs to list objects for pack-objects later */
 253         save_commit_buffer = 0;
 254         init_revisions(&revs, NULL);
 255
 256         /* write prerequisites */
 257         memcpy(argv_boundary + 3, argv + 1, argc * sizeof(const char *));
 258         argv_boundary[0] = "rev-list";
 259         argv_boundary[1] = "--boundary";
 260         argv_boundary[2] = "--pretty=oneline";
 261         argv_boundary[argc + 2] = NULL;
 262         memset(&rls, 0, sizeof(rls));
 263         rls.argv = argv_boundary;
 264         rls.out = -1;
 265         rls.git_cmd = 1;
 266         if (start_command(&rls))
 267                 return -1;
 268         rls_fout = xfdopen(rls.out, "r");
 269         while (strbuf_getwholeline(&buf, rls_fout, '\n') != EOF) {
 270                 unsigned char sha1[20];
 271                 if (buf.len > 0 && buf.buf[0] == '-') {
 272                         write_or_die(bundle_fd, buf.buf, buf.len);
 273                         if (!get_sha1_hex(buf.buf + 1, sha1)) {
 274                                 struct object *object = parse_object(sha1);
 275                                 object->flags |= UNINTERESTING;
 276                                 add_pending_object(&revs, object, xstrdup(buf.buf));
 277                         }
 278                 } else if (!get_sha1_hex(buf.buf, sha1)) {
 279                         struct object *object = parse_object(sha1);
 280                         object->flags |= SHOWN;
 281                 }
 282         }
 283         strbuf_release(&buf);
 284         fclose(rls_fout);
 285         if (finish_command(&rls))
 286                 return error("rev-list died");
 287
 288         /* write references */
 289         argc = setup_revisions(argc, argv, &revs, NULL);
 290
 291         if (argc > 1)
 292                 return error("unrecognized argument: %s", argv[1]);
 293
 294         object_array_remove_duplicates(&revs.pending);
 295
 296         for (i = 0; i < revs.pending.nr; i++) {
 297                 struct object_array_entry *e = revs.pending.objects + i;
 298                 unsigned char sha1[20];
 299                 char *ref;
 300                 const char *display_ref;
 301                 int flag;
 302
 303                 if (e->item->flags & UNINTERESTING)
 304                         continue;
 305                 if (dwim_ref(e->name, strlen(e->name), sha1, &ref) != 1)
 306                         continue;
 307                 if (read_ref_full(e->name, sha1, 1, &flag))
 308                         flag = 0;
 309                 display_ref = (flag & REF_ISSYMREF) ? e->name : ref;
 310
 311                 if (e->item->type == OBJ_TAG &&
 312                                 !is_tag_in_date_range(e->item, &revs)) {
 313                         e->item->flags |= UNINTERESTING;
 314                         continue;
 315                 }
 316
 317                 /*
 318                  * Make sure the refs we wrote out is correct; --max-count and
 319                  * other limiting options could have prevented all the tips
 320                  * from getting output.
 321                  *
 322                  * Non commit objects such as tags and blobs do not have
 323                  * this issue as they are not affected by those extra
 324                  * constraints.
 325                  */
 326                 if (!(e->item->flags & SHOWN) && e->item->type == OBJ_COMMIT) {
 327                         warning("ref '%s' is excluded by the rev-list options",
 328                                 e->name);
 329                         free(ref);
 330                         continue;
 331                 }
 332                 /*
 333                  * If you run "git bundle create bndl v1.0..v2.0", the
 334                  * name of the positive ref is "v2.0" but that is the
 335                  * commit that is referenced by the tag, and not the tag
 336                  * itself.
 337                  */
 338                 if (hashcmp(sha1, e->item->sha1)) {
 339                         /*
 340                          * Is this the positive end of a range expressed
 341                          * in terms of a tag (e.g. v2.0 from the range
 342                          * "v1.0..v2.0")?
 343                          */
 344                         struct commit *one = lookup_commit_reference(sha1);
 345                         struct object *obj;
 346
 347                         if (e->item == &(one->object)) {
 348                                 /*
 349                                  * Need to include e->name as an
 350                                  * independent ref to the pack-objects
 351                                  * input, so that the tag is included
 352                                  * in the output; otherwise we would
 353                                  * end up triggering "empty bundle"
 354                                  * error.
 355                                  */
 356                                 obj = parse_object(sha1);
 357                                 obj->flags |= SHOWN;
 358                                 add_pending_object(&revs, obj, e->name);
 359                         }
 360                         free(ref);
 361                         continue;
 362                 }
 363
 364                 ref_count++;
 365                 write_or_die(bundle_fd, sha1_to_hex(e->item->sha1), 40);
 366                 write_or_die(bundle_fd, " ", 1);
 367                 write_or_die(bundle_fd, display_ref, strlen(display_ref));
 368                 write_or_die(bundle_fd, "\n", 1);
 369                 free(ref);
 370         }
 371         if (!ref_count)
 372                 die ("Refusing to create empty bundle.");
 373
 374         /* end header */
 375         write_or_die(bundle_fd, "\n", 1);
 376
 377         /* write pack */
 378         argv_pack[0] = "pack-objects";
 379         argv_pack[1] = "--all-progress-implied";
 380         argv_pack[2] = "--stdout";
 381         argv_pack[3] = "--thin";
 382         argv_pack[4] = "--delta-base-offset";
 383         argv_pack[5] = NULL;
 384         memset(&rls, 0, sizeof(rls));
 385         rls.argv = argv_pack;
 386         rls.in = -1;
 387         rls.out = bundle_fd;
 388         rls.git_cmd = 1;
 389         if (start_command(&rls))
 390                 return error("Could not spawn pack-objects");
 391
 392         /*
 393          * start_command closed bundle_fd if it was > 1
 394          * so set the lock fd to -1 so commit_lock_file()
 395          * won't fail trying to close it.
 396          */
 397         lock.fd = -1;
 398
 399         for (i = 0; i < revs.pending.nr; i++) {
 400                 struct object *object = revs.pending.objects[i].item;
 401                 if (object->flags & UNINTERESTING)
 402                         write_or_die(rls.in, "^", 1);
 403                 write_or_die(rls.in, sha1_to_hex(object->sha1), 40);
 404                 write_or_die(rls.in, "\n", 1);
 405         }
 406         close(rls.in);
 407         if (finish_command(&rls))
 408                 return error ("pack-objects died");
 409         if (!bundle_to_stdout) {
 410                 if (commit_lock_file(&lock))
 411                         die_errno("cannot create '%s'", path);
 412         }
 413         return 0;
 414 }
 415
 416 int unbundle(struct bundle_header *header, int bundle_fd, int flags)
 417 {
 418         const char *argv_index_pack[] = {"index-pack",
 419                                          "--fix-thin", "--stdin", NULL, NULL};
 420         struct child_process ip;
 421
 422         if (flags & BUNDLE_VERBOSE)
 423                 argv_index_pack[3] = "-v";
 424
 425         if (verify_bundle(header, 0))
 426                 return -1;
 427         memset(&ip, 0, sizeof(ip));
 428         ip.argv = argv_index_pack;
 429         ip.in = bundle_fd;
 430         ip.no_stdout = 1;
 431         ip.git_cmd = 1;
 432         if (run_command(&ip))
 433                 return error("index-pack died");
 434         return 0;
 435 }