Move bundle specific stuff into bundle.[ch]
[git/git.git] / builtin-bundle.c
index 1b65006..9f38e21 100644 (file)
@@ -1,11 +1,6 @@
 #include "builtin.h"
 #include "cache.h"
-#include "object.h"
-#include "commit.h"
-#include "diff.h"
-#include "revision.h"
-#include "list-objects.h"
-#include "run-command.h"
+#include "bundle.h"
 
 /*
  * Basic handler for bundle files to connect repositories via sneakernet.
 
 static const char *bundle_usage="git-bundle (create <bundle> <git-rev-list args> | verify <bundle> | list-heads <bundle> [refname]... | unbundle <bundle> [refname]... )";
 
-static const char bundle_signature[] = "# v2 git bundle\n";
-
-struct ref_list {
-       unsigned int nr, alloc;
-       struct ref_list_entry {
-               unsigned char sha1[20];
-               char *name;
-       } *list;
-};
-
-static void add_to_ref_list(const unsigned char *sha1, const char *name,
-               struct ref_list *list)
-{
-       if (list->nr + 1 >= list->alloc) {
-               list->alloc = alloc_nr(list->nr + 1);
-               list->list = xrealloc(list->list,
-                               list->alloc * sizeof(list->list[0]));
-       }
-       memcpy(list->list[list->nr].sha1, sha1, 20);
-       list->list[list->nr].name = xstrdup(name);
-       list->nr++;
-}
-
-struct bundle_header {
-       struct ref_list prerequisites;
-       struct ref_list references;
-};
-
-/* returns an fd */
-static int read_header(const char *path, struct bundle_header *header) {
-       char buffer[1024];
-       int fd;
-       long fpos;
-       FILE *ffd = fopen(path, "rb");
-
-       if (!ffd)
-               return error("could not open '%s'", path);
-       if (!fgets(buffer, sizeof(buffer), ffd) ||
-                       strcmp(buffer, bundle_signature)) {
-               fclose(ffd);
-               return error("'%s' does not look like a v2 bundle file", path);
-       }
-       while (fgets(buffer, sizeof(buffer), ffd)
-                       && buffer[0] != '\n') {
-               int is_prereq = buffer[0] == '-';
-               int offset = is_prereq ? 1 : 0;
-               int len = strlen(buffer);
-               unsigned char sha1[20];
-               struct ref_list *list = is_prereq ? &header->prerequisites
-                       : &header->references;
-               char delim;
-
-               if (buffer[len - 1] == '\n')
-                       buffer[len - 1] = '\0';
-               if (get_sha1_hex(buffer + offset, sha1)) {
-                       warning("unrecognized header: %s", buffer);
-                       continue;
-               }
-               delim = buffer[40 + offset];
-               if (!isspace(delim) && (delim != '\0' || !is_prereq))
-                       die ("invalid header: %s", buffer);
-               add_to_ref_list(sha1, isspace(delim) ?
-                               buffer + 41 + offset : "", list);
-       }
-       fpos = ftell(ffd);
-       fclose(ffd);
-       fd = open(path, O_RDONLY);
-       if (fd < 0)
-               return error("could not open '%s'", path);
-       lseek(fd, fpos, SEEK_SET);
-       return fd;
-}
-
-static int list_refs(struct ref_list *r, int argc, const char **argv)
-{
-       int i;
-
-       for (i = 0; i < r->nr; i++) {
-               if (argc > 1) {
-                       int j;
-                       for (j = 1; j < argc; j++)
-                               if (!strcmp(r->list[i].name, argv[j]))
-                                       break;
-                       if (j == argc)
-                               continue;
-               }
-               printf("%s %s\n", sha1_to_hex(r->list[i].sha1),
-                               r->list[i].name);
-       }
-       return 0;
-}
-
-#define PREREQ_MARK (1u<<16)
-
-static int verify_bundle(struct bundle_header *header, int verbose)
-{
-       /*
-        * Do fast check, then if any prereqs are missing then go line by line
-        * to be verbose about the errors
-        */
-       struct ref_list *p = &header->prerequisites;
-       struct rev_info revs;
-       const char *argv[] = {NULL, "--all"};
-       struct object_array refs;
-       struct commit *commit;
-       int i, ret = 0, req_nr;
-       const char *message = "Repository lacks these prerequisite commits:";
-
-       init_revisions(&revs, NULL);
-       for (i = 0; i < p->nr; i++) {
-               struct ref_list_entry *e = p->list + i;
-               struct object *o = parse_object(e->sha1);
-               if (o) {
-                       o->flags |= PREREQ_MARK;
-                       add_pending_object(&revs, o, e->name);
-                       continue;
-               }
-               if (++ret == 1)
-                       error(message);
-               error("%s %s", sha1_to_hex(e->sha1), e->name);
-       }
-       if (revs.pending.nr != p->nr)
-               return ret;
-       req_nr = revs.pending.nr;
-       setup_revisions(2, argv, &revs, NULL);
-
-       memset(&refs, 0, sizeof(struct object_array));
-       for (i = 0; i < revs.pending.nr; i++) {
-               struct object_array_entry *e = revs.pending.objects + i;
-               add_object_array(e->item, e->name, &refs);
-       }
-
-       prepare_revision_walk(&revs);
-
-       i = req_nr;
-       while (i && (commit = get_revision(&revs)))
-               if (commit->object.flags & PREREQ_MARK)
-                       i--;
-
-       for (i = 0; i < req_nr; i++)
-               if (!(refs.objects[i].item->flags & SHOWN)) {
-                       if (++ret == 1)
-                               error(message);
-                       error("%s %s", sha1_to_hex(refs.objects[i].item->sha1),
-                               refs.objects[i].name);
-               }
-
-       for (i = 0; i < refs.nr; i++)
-               clear_commit_marks((struct commit *)refs.objects[i].item, -1);
-
-       if (verbose) {
-               struct ref_list *r;
-
-               r = &header->references;
-               printf("The bundle contains %d ref%s\n",
-                      r->nr, (1 < r->nr) ? "s" : "");
-               list_refs(r, 0, NULL);
-               r = &header->prerequisites;
-               printf("The bundle requires these %d ref%s\n",
-                      r->nr, (1 < r->nr) ? "s" : "");
-               list_refs(r, 0, NULL);
-       }
-       return ret;
-}
-
-static int list_heads(struct bundle_header *header, int argc, const char **argv)
-{
-       return list_refs(&header->references, argc, argv);
-}
-
-static int create_bundle(struct bundle_header *header, const char *path,
-               int argc, const char **argv)
-{
-       static struct lock_file lock;
-       int bundle_fd = -1;
-       int bundle_to_stdout;
-       const char **argv_boundary = xmalloc((argc + 4) * sizeof(const char *));
-       const char **argv_pack = xmalloc(5 * sizeof(const char *));
-       int i, ref_count = 0;
-       char buffer[1024];
-       struct rev_info revs;
-       struct child_process rls;
-       FILE *rls_fout;
-
-       bundle_to_stdout = !strcmp(path, "-");
-       if (bundle_to_stdout)
-               bundle_fd = 1;
-       else
-               bundle_fd = hold_lock_file_for_update(&lock, path, 1);
-
-       /* write signature */
-       write_or_die(bundle_fd, bundle_signature, strlen(bundle_signature));
-
-       /* init revs to list objects for pack-objects later */
-       save_commit_buffer = 0;
-       init_revisions(&revs, NULL);
-
-       /* write prerequisites */
-       memcpy(argv_boundary + 3, argv + 1, argc * sizeof(const char *));
-       argv_boundary[0] = "rev-list";
-       argv_boundary[1] = "--boundary";
-       argv_boundary[2] = "--pretty=oneline";
-       argv_boundary[argc + 2] = NULL;
-       memset(&rls, 0, sizeof(rls));
-       rls.argv = argv_boundary;
-       rls.out = -1;
-       rls.git_cmd = 1;
-       if (start_command(&rls))
-               return -1;
-       rls_fout = fdopen(rls.out, "r");
-       while (fgets(buffer, sizeof(buffer), rls_fout)) {
-               unsigned char sha1[20];
-               if (buffer[0] == '-') {
-                       write_or_die(bundle_fd, buffer, strlen(buffer));
-                       if (!get_sha1_hex(buffer + 1, sha1)) {
-                               struct object *object = parse_object(sha1);
-                               object->flags |= UNINTERESTING;
-                               add_pending_object(&revs, object, buffer);
-                       }
-               } else if (!get_sha1_hex(buffer, sha1)) {
-                       struct object *object = parse_object(sha1);
-                       object->flags |= SHOWN;
-               }
-       }
-       fclose(rls_fout);
-       if (finish_command(&rls))
-               return error("rev-list died");
-
-       /* write references */
-       argc = setup_revisions(argc, argv, &revs, NULL);
-       if (argc > 1)
-               return error("unrecognized argument: %s'", argv[1]);
-
-       for (i = 0; i < revs.pending.nr; i++) {
-               struct object_array_entry *e = revs.pending.objects + i;
-               unsigned char sha1[20];
-               char *ref;
-
-               if (e->item->flags & UNINTERESTING)
-                       continue;
-               if (dwim_ref(e->name, strlen(e->name), sha1, &ref) != 1)
-                       continue;
-               /*
-                * Make sure the refs we wrote out is correct; --max-count and
-                * other limiting options could have prevented all the tips
-                * from getting output.
-                *
-                * Non commit objects such as tags and blobs do not have
-                * this issue as they are not affected by those extra
-                * constraints.
-                */
-               if (!(e->item->flags & SHOWN) && e->item->type == OBJ_COMMIT) {
-                       warning("ref '%s' is excluded by the rev-list options",
-                               e->name);
-                       free(ref);
-                       continue;
-               }
-               /*
-                * If you run "git bundle create bndl v1.0..v2.0", the
-                * name of the positive ref is "v2.0" but that is the
-                * commit that is referenced by the tag, and not the tag
-                * itself.
-                */
-               if (hashcmp(sha1, e->item->sha1)) {
-                       /*
-                        * Is this the positive end of a range expressed
-                        * in terms of a tag (e.g. v2.0 from the range
-                        * "v1.0..v2.0")?
-                        */
-                       struct commit *one = lookup_commit_reference(sha1);
-                       struct object *obj;
-
-                       if (e->item == &(one->object)) {
-                               /*
-                                * Need to include e->name as an
-                                * independent ref to the pack-objects
-                                * input, so that the tag is included
-                                * in the output; otherwise we would
-                                * end up triggering "empty bundle"
-                                * error.
-                                */
-                               obj = parse_object(sha1);
-                               obj->flags |= SHOWN;
-                               add_pending_object(&revs, obj, e->name);
-                       }
-                       free(ref);
-                       continue;
-               }
-
-               ref_count++;
-               write_or_die(bundle_fd, sha1_to_hex(e->item->sha1), 40);
-               write_or_die(bundle_fd, " ", 1);
-               write_or_die(bundle_fd, ref, strlen(ref));
-               write_or_die(bundle_fd, "\n", 1);
-               free(ref);
-       }
-       if (!ref_count)
-               die ("Refusing to create empty bundle.");
-
-       /* end header */
-       write_or_die(bundle_fd, "\n", 1);
-
-       /* write pack */
-       argv_pack[0] = "pack-objects";
-       argv_pack[1] = "--all-progress";
-       argv_pack[2] = "--stdout";
-       argv_pack[3] = "--thin";
-       argv_pack[4] = NULL;
-       memset(&rls, 0, sizeof(rls));
-       rls.argv = argv_pack;
-       rls.in = -1;
-       rls.out = bundle_fd;
-       rls.git_cmd = 1;
-       if (start_command(&rls))
-               return error("Could not spawn pack-objects");
-       for (i = 0; i < revs.pending.nr; i++) {
-               struct object *object = revs.pending.objects[i].item;
-               if (object->flags & UNINTERESTING)
-                       write(rls.in, "^", 1);
-               write(rls.in, sha1_to_hex(object->sha1), 40);
-               write(rls.in, "\n", 1);
-       }
-       if (finish_command(&rls))
-               return error ("pack-objects died");
-       close(bundle_fd);
-       if (!bundle_to_stdout)
-               commit_lock_file(&lock);
-       return 0;
-}
-
-static int unbundle(struct bundle_header *header, int bundle_fd,
-               int argc, const char **argv)
-{
-       const char *argv_index_pack[] = {"index-pack",
-               "--fix-thin", "--stdin", NULL};
-       struct child_process ip;
-
-       if (verify_bundle(header, 0))
-               return -1;
-       memset(&ip, 0, sizeof(ip));
-       ip.argv = argv_index_pack;
-       ip.in = bundle_fd;
-       ip.no_stdout = 1;
-       ip.git_cmd = 1;
-       if (run_command(&ip))
-               return error("index-pack died");
-       return list_heads(header, argc, argv);
-}
-
 int cmd_bundle(int argc, const char **argv, const char *prefix)
 {
        struct bundle_header header;
@@ -388,8 +34,8 @@ int cmd_bundle(int argc, const char **argv, const char *prefix)
        }
 
        memset(&header, 0, sizeof(header));
-       if (strcmp(cmd, "create") &&
-                       (bundle_fd = read_header(bundle_file, &header)) < 0)
+       if (strcmp(cmd, "create") && (bundle_fd =
+                               read_bundle_header(bundle_file, &header)) < 0)
                return 1;
 
        if (!strcmp(cmd, "verify")) {
@@ -401,7 +47,7 @@ int cmd_bundle(int argc, const char **argv, const char *prefix)
        }
        if (!strcmp(cmd, "list-heads")) {
                close(bundle_fd);
-               return !!list_heads(&header, argc, argv);
+               return !!list_bundle_refs(&header, argc, argv);
        }
        if (!strcmp(cmd, "create")) {
                if (nongit)
@@ -410,7 +56,8 @@ int cmd_bundle(int argc, const char **argv, const char *prefix)
        } else if (!strcmp(cmd, "unbundle")) {
                if (nongit)
                        die("Need a repository to unbundle.");
-               return !!unbundle(&header, bundle_fd, argc, argv);
+               return !!unbundle(&header, bundle_fd) ||
+                       list_bundle_refs(&header, argc, argv);
        } else
                usage(bundle_usage);
 }