| 1 | #include "git-compat-util.h" |
| 2 | #include "gettext.h" |
| 3 | #include "hex.h" |
| 4 | #include "oidmap.h" |
| 5 | #include "odb.h" |
| 6 | #include "replace-object.h" |
| 7 | #include "refs.h" |
| 8 | #include "repository.h" |
| 9 | #include "commit.h" |
| 10 | |
| 11 | static int register_replace_ref(const struct reference *ref, void *cb_data) |
| 12 | { |
| 13 | struct repository *r = cb_data; |
| 14 | |
| 15 | /* Get sha1 from refname */ |
| 16 | const char *slash = strrchr(ref->name, '/'); |
| 17 | const char *hash = slash ? slash + 1 : ref->name; |
| 18 | struct replace_object *repl_obj = xmalloc(sizeof(*repl_obj)); |
| 19 | |
| 20 | if (get_oid_hex_algop(hash, &repl_obj->original.oid, r->hash_algo)) { |
| 21 | free(repl_obj); |
| 22 | warning(_("bad replace ref name: %s"), ref->name); |
| 23 | return 0; |
| 24 | } |
| 25 | |
| 26 | /* Copy sha1 from the read ref */ |
| 27 | oidcpy(&repl_obj->replacement, ref->oid); |
| 28 | |
| 29 | /* Register new object */ |
| 30 | if (oidmap_put(&r->objects->replace_map, repl_obj)) |
| 31 | die(_("duplicate replace ref: %s"), ref->name); |
| 32 | |
| 33 | return 0; |
| 34 | } |
| 35 | |
| 36 | void prepare_replace_object(struct repository *r) |
| 37 | { |
| 38 | if (r->objects->replace_map_initialized) |
| 39 | return; |
| 40 | |
| 41 | pthread_mutex_lock(&r->objects->replace_mutex); |
| 42 | if (r->objects->replace_map_initialized) { |
| 43 | pthread_mutex_unlock(&r->objects->replace_mutex); |
| 44 | return; |
| 45 | } |
| 46 | |
| 47 | oidmap_init(&r->objects->replace_map, 0); |
| 48 | |
| 49 | refs_for_each_replace_ref(get_main_ref_store(r), |
| 50 | register_replace_ref, r); |
| 51 | r->objects->replace_map_initialized = 1; |
| 52 | |
| 53 | pthread_mutex_unlock(&r->objects->replace_mutex); |
| 54 | } |
| 55 | |
| 56 | /* We allow "recursive" replacement. Only within reason, though */ |
| 57 | #define MAXREPLACEDEPTH 5 |
| 58 | |
| 59 | /* |
| 60 | * If a replacement for object oid has been set up, return the |
| 61 | * replacement object's name (replaced recursively, if necessary). |
| 62 | * The return value is either oid or a pointer to a |
| 63 | * permanently-allocated value. This function always respects replace |
| 64 | * references, regardless of the value of r->settings.read_replace_refs. |
| 65 | */ |
| 66 | const struct object_id *do_lookup_replace_object(struct repository *r, |
| 67 | const struct object_id *oid) |
| 68 | { |
| 69 | int depth = MAXREPLACEDEPTH; |
| 70 | const struct object_id *cur = oid; |
| 71 | |
| 72 | prepare_replace_object(r); |
| 73 | |
| 74 | /* Try to recursively replace the object */ |
| 75 | while (depth-- > 0) { |
| 76 | struct replace_object *repl_obj = |
| 77 | oidmap_get(&r->objects->replace_map, cur); |
| 78 | if (!repl_obj) |
| 79 | return cur; |
| 80 | cur = &repl_obj->replacement; |
| 81 | } |
| 82 | die(_("replace depth too high for object %s"), oid_to_hex(oid)); |
| 83 | } |
| 84 | |
| 85 | /* |
| 86 | * This indicator determines whether replace references should be |
| 87 | * respected process-wide, regardless of which repository is being |
| 88 | * using at the time. |
| 89 | */ |
| 90 | static int read_replace_refs = 1; |
| 91 | |
| 92 | void disable_replace_refs(void) |
| 93 | { |
| 94 | read_replace_refs = 0; |
| 95 | } |
| 96 | |
| 97 | int replace_refs_enabled(struct repository *r) |
| 98 | { |
| 99 | if (!read_replace_refs) |
| 100 | return 0; |
| 101 | |
| 102 | if (r->gitdir) { |
| 103 | prepare_repo_settings(r); |
| 104 | return r->settings.read_replace_refs; |
| 105 | } |
| 106 | |
| 107 | /* repository has no objects or refs. */ |
| 108 | return 0; |
| 109 | } |