git.oblomov.eu Git - git/blob - 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 /* Eventually this should go to strbuf.[ch] */
  27 static int strbuf_readline_fd(struct strbuf *sb, int fd)
  28 {
  29         strbuf_reset(sb);
  30
  31         while (1) {
  32                 char ch;
  33                 ssize_t len = xread(fd, &ch, 1);
  34                 if (len < 0)
  35                         return -1;
  36                 strbuf_addch(sb, ch);
  37                 if (ch == '\n')
  38                         break;
  39         }
  40         return 0;
  41 }
  42
  43 int read_bundle_header(const char *path, struct bundle_header *header)
  44 {
  45         struct strbuf buf = STRBUF_INIT;
  46         int fd = open(path, O_RDONLY);
  47         int status = 0;
  48
  49         if (fd < 0)
  50                 return error("could not open '%s'", path);
  51
  52         /* The bundle header begins with the signature */
  53         if (strbuf_readline_fd(&buf, fd) ||
  54             strcmp(buf.buf, bundle_signature)) {
  55                 error("'%s' does not look like a v2 bundle file", path);
  56                 status = -1;
  57                 goto abort;
  58         }
  59
  60         /* The bundle header ends with an empty line */
  61         while (!strbuf_readline_fd(&buf, fd) &&
  62                buf.len && buf.buf[0] != '\n') {
  63                 unsigned char sha1[20];
  64                 int is_prereq = 0;
  65
  66                 if (*buf.buf == '-') {
  67                         is_prereq = 1;
  68                         strbuf_remove(&buf, 0, 1);
  69                 }
  70                 strbuf_rtrim(&buf);
  71
  72                 /*
  73                  * Tip lines have object name, SP, and refname.
  74                  * Prerequisites have object name that is optionally
  75                  * followed by SP and subject line.
  76                  */
  77                 if (get_sha1_hex(buf.buf, sha1) ||
  78                     (40 <= buf.len && !isspace(buf.buf[40])) ||
  79                     (!is_prereq && buf.len <= 40)) {
  80                         error("unrecognized header: %s%s (%d)",
  81                               (is_prereq ? "-" : ""), buf.buf, (int)buf.len);
  82                         status = -1;
  83                         break;
  84                 } else {
  85                         if (is_prereq)
  86                                 add_to_ref_list(sha1, "", &header->prerequisites);
  87                         else
  88                                 add_to_ref_list(sha1, buf.buf + 41, &header->references);
  89                 }
  90         }
  91
  92  abort:
  93         if (status) {
  94                 close(fd);
  95                 fd = -1;
  96         }
  97         strbuf_release(&buf);
  98         return fd;
  99 }
 100
 101 static int list_refs(struct ref_list *r, int argc, const char **argv)
 102 {
 103         int i;
 104
 105         for (i = 0; i < r->nr; i++) {
 106                 if (argc > 1) {
 107                         int j;
 108                         for (j = 1; j < argc; j++)
 109                                 if (!strcmp(r->list[i].name, argv[j]))
 110                                         break;
 111                         if (j == argc)
 112                                 continue;
 113                 }
 114                 printf("%s %s\n", sha1_to_hex(r->list[i].sha1),
 115                                 r->list[i].name);
 116         }
 117         return 0;
 118 }
 119
 120 #define PREREQ_MARK (1u<<16)
 121
 122 int verify_bundle(struct bundle_header *header, int verbose)
 123 {
 124         /*
 125          * Do fast check, then if any prereqs are missing then go line by line
 126          * to be verbose about the errors
 127          */
 128         struct ref_list *p = &header->prerequisites;
 129         struct rev_info revs;
 130         const char *argv[] = {NULL, "--all", NULL};
 131         struct object_array refs;
 132         struct commit *commit;
 133         int i, ret = 0, req_nr;
 134         const char *message = "Repository lacks these prerequisite commits:";
 135
 136         init_revisions(&revs, NULL);
 137         for (i = 0; i < p->nr; i++) {
 138                 struct ref_list_entry *e = p->list + i;
 139                 struct object *o = parse_object(e->sha1);
 140                 if (o) {
 141                         o->flags |= PREREQ_MARK;
 142                         add_pending_object(&revs, o, e->name);
 143                         continue;
 144                 }
 145                 if (++ret == 1)
 146                         error("%s", message);
 147                 error("%s %s", sha1_to_hex(e->sha1), e->name);
 148         }
 149         if (revs.pending.nr != p->nr)
 150                 return ret;
 151         req_nr = revs.pending.nr;
 152         setup_revisions(2, argv, &revs, NULL);
 153
 154         memset(&refs, 0, sizeof(struct object_array));
 155         for (i = 0; i < revs.pending.nr; i++) {
 156                 struct object_array_entry *e = revs.pending.objects + i;
 157                 add_object_array(e->item, e->name, &refs);
 158         }
 159
 160         if (prepare_revision_walk(&revs))
 161                 die("revision walk setup failed");
 162
 163         i = req_nr;
 164         while (i && (commit = get_revision(&revs)))
 165                 if (commit->object.flags & PREREQ_MARK)
 166                         i--;
 167
 168         for (i = 0; i < req_nr; i++)
 169                 if (!(refs.objects[i].item->flags & SHOWN)) {
 170                         if (++ret == 1)
 171                                 error("%s", message);
 172                         error("%s %s", sha1_to_hex(refs.objects[i].item->sha1),
 173                                 refs.objects[i].name);
 174                 }
 175
 176         for (i = 0; i < refs.nr; i++)
 177                 clear_commit_marks((struct commit *)refs.objects[i].item, -1);
 178
 179         if (verbose) {
 180                 struct ref_list *r;
 181
 182                 r = &header->references;
 183                 printf("The bundle contains %d ref%s\n",
 184                        r->nr, (1 < r->nr) ? "s" : "");
 185                 list_refs(r, 0, NULL);
 186                 r = &header->prerequisites;
 187                 printf("The bundle requires these %d ref%s\n",
 188                        r->nr, (1 < r->nr) ? "s" : "");
 189                 list_refs(r, 0, NULL);
 190         }
 191         return ret;
 192 }
 193
 194 int list_bundle_refs(struct bundle_header *header, int argc, const char **argv)
 195 {
 196         return list_refs(&header->references, argc, argv);
 197 }
 198
 199 static int is_tag_in_date_range(struct object *tag, struct rev_info *revs)
 200 {
 201         unsigned long size;
 202         enum object_type type;
 203         char *buf, *line, *lineend;
 204         unsigned long date;
 205
 206         if (revs->max_age == -1 && revs->min_age == -1)
 207                 return 1;
 208
 209         buf = read_sha1_file(tag->sha1, &type, &size);
 210         if (!buf)
 211                 return 1;
 212         line = memmem(buf, size, "\ntagger ", 8);
 213         if (!line++)
 214                 return 1;
 215         lineend = memchr(line, buf + size - line, '\n');
 216         line = memchr(line, lineend ? lineend - line : buf + size - line, '>');
 217         if (!line++)
 218                 return 1;
 219         date = strtoul(line, NULL, 10);
 220         free(buf);
 221         return (revs->max_age == -1 || revs->max_age < date) &&
 222                 (revs->min_age == -1 || revs->min_age > date);
 223 }
 224
 225 int create_bundle(struct bundle_header *header, const char *path,
 226                 int argc, const char **argv)
 227 {
 228         static struct lock_file lock;
 229         int bundle_fd = -1;
 230         int bundle_to_stdout;
 231         const char **argv_boundary = xmalloc((argc + 4) * sizeof(const char *));
 232         const char **argv_pack = xmalloc(6 * sizeof(const char *));
 233         int i, ref_count = 0;
 234         char buffer[1024];
 235         struct rev_info revs;
 236         struct child_process rls;
 237         FILE *rls_fout;
 238
 239         bundle_to_stdout = !strcmp(path, "-");
 240         if (bundle_to_stdout)
 241                 bundle_fd = 1;
 242         else
 243                 bundle_fd = hold_lock_file_for_update(&lock, path,
 244                                                       LOCK_DIE_ON_ERROR);
 245
 246         /* write signature */
 247         write_or_die(bundle_fd, bundle_signature, strlen(bundle_signature));
 248
 249         /* init revs to list objects for pack-objects later */
 250         save_commit_buffer = 0;
 251         init_revisions(&revs, NULL);
 252
 253         /* write prerequisites */
 254         memcpy(argv_boundary + 3, argv + 1, argc * sizeof(const char *));
 255         argv_boundary[0] = "rev-list";
 256         argv_boundary[1] = "--boundary";
 257         argv_boundary[2] = "--pretty=oneline";
 258         argv_boundary[argc + 2] = NULL;
 259         memset(&rls, 0, sizeof(rls));
 260         rls.argv = argv_boundary;
 261         rls.out = -1;
 262         rls.git_cmd = 1;
 263         if (start_command(&rls))
 264                 return -1;
 265         rls_fout = xfdopen(rls.out, "r");
 266         while (fgets(buffer, sizeof(buffer), rls_fout)) {
 267                 unsigned char sha1[20];
 268                 if (buffer[0] == '-') {
 269                         write_or_die(bundle_fd, buffer, strlen(buffer));
 270                         if (!get_sha1_hex(buffer + 1, sha1)) {
 271                                 struct object *object = parse_object(sha1);
 272                                 object->flags |= UNINTERESTING;
 273                                 add_pending_object(&revs, object, buffer);
 274                         }
 275                 } else if (!get_sha1_hex(buffer, sha1)) {
 276                         struct object *object = parse_object(sha1);
 277                         object->flags |= SHOWN;
 278                 }
 279         }
 280         fclose(rls_fout);
 281         if (finish_command(&rls))
 282                 return error("rev-list died");
 283
 284         /* write references */
 285         argc = setup_revisions(argc, argv, &revs, NULL);
 286
 287         if (argc > 1)
 288                 return error("unrecognized argument: %s'", argv[1]);
 289
 290         object_array_remove_duplicates(&revs.pending);
 291
 292         for (i = 0; i < revs.pending.nr; i++) {
 293                 struct object_array_entry *e = revs.pending.objects + i;
 294                 unsigned char sha1[20];
 295                 char *ref;
 296                 const char *display_ref;
 297                 int flag;
 298
 299                 if (e->item->flags & UNINTERESTING)
 300                         continue;
 301                 if (dwim_ref(e->name, strlen(e->name), sha1, &ref) != 1)
 302                         continue;
 303                 if (!resolve_ref(e->name, sha1, 1, &flag))
 304                         flag = 0;
 305                 display_ref = (flag & REF_ISSYMREF) ? e->name : ref;
 306
 307                 if (e->item->type == OBJ_TAG &&
 308                                 !is_tag_in_date_range(e->item, &revs)) {
 309                         e->item->flags |= UNINTERESTING;
 310                         continue;
 311                 }
 312
 313                 /*
 314                  * Make sure the refs we wrote out is correct; --max-count and
 315                  * other limiting options could have prevented all the tips
 316                  * from getting output.
 317                  *
 318                  * Non commit objects such as tags and blobs do not have
 319                  * this issue as they are not affected by those extra
 320                  * constraints.
 321                  */
 322                 if (!(e->item->flags & SHOWN) && e->item->type == OBJ_COMMIT) {
 323                         warning("ref '%s' is excluded by the rev-list options",
 324                                 e->name);
 325                         free(ref);
 326                         continue;
 327                 }
 328                 /*
 329                  * If you run "git bundle create bndl v1.0..v2.0", the
 330                  * name of the positive ref is "v2.0" but that is the
 331                  * commit that is referenced by the tag, and not the tag
 332                  * itself.
 333                  */
 334                 if (hashcmp(sha1, e->item->sha1)) {
 335                         /*
 336                          * Is this the positive end of a range expressed
 337                          * in terms of a tag (e.g. v2.0 from the range
 338                          * "v1.0..v2.0")?
 339                          */
 340                         struct commit *one = lookup_commit_reference(sha1);
 341                         struct object *obj;
 342
 343                         if (e->item == &(one->object)) {
 344                                 /*
 345                                  * Need to include e->name as an
 346                                  * independent ref to the pack-objects
 347                                  * input, so that the tag is included
 348                                  * in the output; otherwise we would
 349                                  * end up triggering "empty bundle"
 350                                  * error.
 351                                  */
 352                                 obj = parse_object(sha1);
 353                                 obj->flags |= SHOWN;
 354                                 add_pending_object(&revs, obj, e->name);
 355                         }
 356                         free(ref);
 357                         continue;
 358                 }
 359
 360                 ref_count++;
 361                 write_or_die(bundle_fd, sha1_to_hex(e->item->sha1), 40);
 362                 write_or_die(bundle_fd, " ", 1);
 363                 write_or_die(bundle_fd, display_ref, strlen(display_ref));
 364                 write_or_die(bundle_fd, "\n", 1);
 365                 free(ref);
 366         }
 367         if (!ref_count)
 368                 die ("Refusing to create empty bundle.");
 369
 370         /* end header */
 371         write_or_die(bundle_fd, "\n", 1);
 372
 373         /* write pack */
 374         argv_pack[0] = "pack-objects";
 375         argv_pack[1] = "--all-progress-implied";
 376         argv_pack[2] = "--stdout";
 377         argv_pack[3] = "--thin";
 378         argv_pack[4] = "--delta-base-offset";
 379         argv_pack[5] = NULL;
 380         memset(&rls, 0, sizeof(rls));
 381         rls.argv = argv_pack;
 382         rls.in = -1;
 383         rls.out = bundle_fd;
 384         rls.git_cmd = 1;
 385         if (start_command(&rls))
 386                 return error("Could not spawn pack-objects");
 387
 388         /*
 389          * start_command closed bundle_fd if it was > 1
 390          * so set the lock fd to -1 so commit_lock_file()
 391          * won't fail trying to close it.
 392          */
 393         lock.fd = -1;
 394
 395         for (i = 0; i < revs.pending.nr; i++) {
 396                 struct object *object = revs.pending.objects[i].item;
 397                 if (object->flags & UNINTERESTING)
 398                         write_or_die(rls.in, "^", 1);
 399                 write_or_die(rls.in, sha1_to_hex(object->sha1), 40);
 400                 write_or_die(rls.in, "\n", 1);
 401         }
 402         close(rls.in);
 403         if (finish_command(&rls))
 404                 return error ("pack-objects died");
 405         if (!bundle_to_stdout) {
 406                 if (commit_lock_file(&lock))
 407                         die_errno("cannot create '%s'", path);
 408         }
 409         return 0;
 410 }
 411
 412 int unbundle(struct bundle_header *header, int bundle_fd)
 413 {
 414         const char *argv_index_pack[] = {"index-pack",
 415                 "--fix-thin", "--stdin", NULL};
 416         struct child_process ip;
 417
 418         if (verify_bundle(header, 0))
 419                 return -1;
 420         memset(&ip, 0, sizeof(ip));
 421         ip.argv = argv_index_pack;
 422         ip.in = bundle_fd;
 423         ip.no_stdout = 1;
 424         ip.git_cmd = 1;
 425         if (run_command(&ip))
 426                 return error("index-pack died");
 427         return 0;
 428 }