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