diff options
Diffstat (limited to 'refs.c')
| -rw-r--r-- | refs.c | 328 |
1 files changed, 315 insertions, 13 deletions
@@ -10,6 +10,25 @@ #include "tag.h" /* + * List of all available backends + */ +static struct ref_storage_be *refs_backends = &refs_be_files; + +static struct ref_storage_be *find_ref_storage_backend(const char *name) +{ + struct ref_storage_be *be; + for (be = refs_backends; be; be = be->next) + if (!strcmp(be->name, name)) + return be; + return NULL; +} + +int ref_storage_backend_exists(const char *name) +{ + return find_ref_storage_backend(name) != NULL; +} + +/* * How to handle various characters in refnames: * 0: An acceptable character for refs * 1: End-of-component @@ -400,6 +419,13 @@ static char *substitute_branch_name(const char **string, int *len) int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref) { char *last_branch = substitute_branch_name(&str, &len); + int refs_found = expand_ref(str, len, sha1, ref); + free(last_branch); + return refs_found; +} + +int expand_ref(const char *str, int len, unsigned char *sha1, char **ref) +{ const char **p, *r; int refs_found = 0; @@ -425,7 +451,6 @@ int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref) warning("ignoring broken ref %s.", fullref); } } - free(last_branch); return refs_found; } @@ -791,8 +816,7 @@ struct ref_update *ref_transaction_add_update( hashcpy(update->new_sha1, new_sha1); if (flags & REF_HAVE_OLD) hashcpy(update->old_sha1, old_sha1); - if (msg) - update->msg = xstrdup(msg); + update->msg = xstrdup_or_null(msg); return update; } @@ -858,6 +882,14 @@ int ref_transaction_verify(struct ref_transaction *transaction, flags, NULL, err); } +int update_ref_oid(const char *msg, const char *refname, + const struct object_id *new_oid, const struct object_id *old_oid, + unsigned int flags, enum action_on_err onerr) +{ + return update_ref(msg, refname, new_oid ? new_oid->hash : NULL, + old_oid ? old_oid->hash : NULL, flags, onerr); +} + int update_ref(const char *msg, const char *refname, const unsigned char *new_sha1, const unsigned char *old_sha1, unsigned int flags, enum action_on_err onerr) @@ -1081,20 +1113,20 @@ const char *find_descendant_ref(const char *dirname, return NULL; } -int rename_ref_available(const char *oldname, const char *newname) +int rename_ref_available(const char *old_refname, const char *new_refname) { struct string_list skip = STRING_LIST_INIT_NODUP; struct strbuf err = STRBUF_INIT; - int ret; + int ok; - string_list_insert(&skip, oldname); - ret = !verify_refname_available(newname, NULL, &skip, &err); - if (!ret) + string_list_insert(&skip, old_refname); + ok = !verify_refname_available(new_refname, NULL, &skip, &err); + if (!ok) error("%s", err.buf); string_list_clear(&skip, 0); strbuf_release(&err); - return ret; + return ok; } int head_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) @@ -1132,9 +1164,13 @@ int head_ref(each_ref_fn fn, void *cb_data) static int do_for_each_ref(const char *submodule, const char *prefix, each_ref_fn fn, int trim, int flags, void *cb_data) { + struct ref_store *refs = get_ref_store(submodule); struct ref_iterator *iter; - iter = files_ref_iterator_begin(submodule, prefix, flags); + if (!refs) + return 0; + + iter = refs->be->iterator_begin(refs, prefix, flags); iter = prefix_ref_iterator_begin(iter, prefix, trim); return do_for_each_ref_iterator(iter, fn, cb_data); @@ -1193,8 +1229,10 @@ int for_each_rawref(each_ref_fn fn, void *cb_data) } /* This function needs to return a meaningful errno on failure */ -const char *resolve_ref_unsafe(const char *refname, int resolve_flags, - unsigned char *sha1, int *flags) +static const char *resolve_ref_recursively(struct ref_store *refs, + const char *refname, + int resolve_flags, + unsigned char *sha1, int *flags) { static struct strbuf sb_refname = STRBUF_INIT; int unused_flags; @@ -1226,7 +1264,8 @@ const char *resolve_ref_unsafe(const char *refname, int resolve_flags, for (symref_count = 0; symref_count < SYMREF_MAXDEPTH; symref_count++) { unsigned int read_flags = 0; - if (read_raw_ref(refname, sha1, &sb_refname, &read_flags)) { + if (refs->be->read_raw_ref(refs, refname, + sha1, &sb_refname, &read_flags)) { *flags |= read_flags; if (errno != ENOENT || (resolve_flags & RESOLVE_REF_READING)) return NULL; @@ -1265,3 +1304,266 @@ const char *resolve_ref_unsafe(const char *refname, int resolve_flags, errno = ELOOP; return NULL; } + +/* backend functions */ +int refs_init_db(struct strbuf *err) +{ + struct ref_store *refs = get_ref_store(NULL); + + return refs->be->init_db(refs, err); +} + +const char *resolve_ref_unsafe(const char *refname, int resolve_flags, + unsigned char *sha1, int *flags) +{ + return resolve_ref_recursively(get_ref_store(NULL), refname, + resolve_flags, sha1, flags); +} + +int resolve_gitlink_ref(const char *submodule, const char *refname, + unsigned char *sha1) +{ + size_t len = strlen(submodule); + struct ref_store *refs; + int flags; + + while (len && submodule[len - 1] == '/') + len--; + + if (!len) + return -1; + + if (submodule[len]) { + /* We need to strip off one or more trailing slashes */ + char *stripped = xmemdupz(submodule, len); + + refs = get_ref_store(stripped); + free(stripped); + } else { + refs = get_ref_store(submodule); + } + + if (!refs) + return -1; + + if (!resolve_ref_recursively(refs, refname, 0, sha1, &flags) || + is_null_sha1(sha1)) + return -1; + return 0; +} + +/* A pointer to the ref_store for the main repository: */ +static struct ref_store *main_ref_store; + +/* A linked list of ref_stores for submodules: */ +static struct ref_store *submodule_ref_stores; + +void base_ref_store_init(struct ref_store *refs, + const struct ref_storage_be *be, + const char *submodule) +{ + refs->be = be; + if (!submodule) { + if (main_ref_store) + die("BUG: main_ref_store initialized twice"); + + refs->submodule = ""; + refs->next = NULL; + main_ref_store = refs; + } else { + if (lookup_ref_store(submodule)) + die("BUG: ref_store for submodule '%s' initialized twice", + submodule); + + refs->submodule = xstrdup(submodule); + refs->next = submodule_ref_stores; + submodule_ref_stores = refs; + } +} + +struct ref_store *ref_store_init(const char *submodule) +{ + const char *be_name = "files"; + struct ref_storage_be *be = find_ref_storage_backend(be_name); + + if (!be) + die("BUG: reference backend %s is unknown", be_name); + + if (!submodule || !*submodule) + return be->init(NULL); + else + return be->init(submodule); +} + +struct ref_store *lookup_ref_store(const char *submodule) +{ + struct ref_store *refs; + + if (!submodule || !*submodule) + return main_ref_store; + + for (refs = submodule_ref_stores; refs; refs = refs->next) { + if (!strcmp(submodule, refs->submodule)) + return refs; + } + + return NULL; +} + +struct ref_store *get_ref_store(const char *submodule) +{ + struct ref_store *refs; + + if (!submodule || !*submodule) { + refs = lookup_ref_store(NULL); + + if (!refs) + refs = ref_store_init(NULL); + } else { + refs = lookup_ref_store(submodule); + + if (!refs) { + struct strbuf submodule_sb = STRBUF_INIT; + + strbuf_addstr(&submodule_sb, submodule); + if (is_nonbare_repository_dir(&submodule_sb)) + refs = ref_store_init(submodule); + strbuf_release(&submodule_sb); + } + } + + return refs; +} + +void assert_main_repository(struct ref_store *refs, const char *caller) +{ + if (*refs->submodule) + die("BUG: %s called for a submodule", caller); +} + +/* backend functions */ +int pack_refs(unsigned int flags) +{ + struct ref_store *refs = get_ref_store(NULL); + + return refs->be->pack_refs(refs, flags); +} + +int peel_ref(const char *refname, unsigned char *sha1) +{ + struct ref_store *refs = get_ref_store(NULL); + + return refs->be->peel_ref(refs, refname, sha1); +} + +int create_symref(const char *ref_target, const char *refs_heads_master, + const char *logmsg) +{ + struct ref_store *refs = get_ref_store(NULL); + + return refs->be->create_symref(refs, ref_target, refs_heads_master, + logmsg); +} + +int ref_transaction_commit(struct ref_transaction *transaction, + struct strbuf *err) +{ + struct ref_store *refs = get_ref_store(NULL); + + return refs->be->transaction_commit(refs, transaction, err); +} + +int verify_refname_available(const char *refname, + const struct string_list *extra, + const struct string_list *skip, + struct strbuf *err) +{ + struct ref_store *refs = get_ref_store(NULL); + + return refs->be->verify_refname_available(refs, refname, extra, skip, err); +} + +int for_each_reflog(each_ref_fn fn, void *cb_data) +{ + struct ref_store *refs = get_ref_store(NULL); + struct ref_iterator *iter; + + iter = refs->be->reflog_iterator_begin(refs); + + return do_for_each_ref_iterator(iter, fn, cb_data); +} + +int for_each_reflog_ent_reverse(const char *refname, each_reflog_ent_fn fn, + void *cb_data) +{ + struct ref_store *refs = get_ref_store(NULL); + + return refs->be->for_each_reflog_ent_reverse(refs, refname, + fn, cb_data); +} + +int for_each_reflog_ent(const char *refname, each_reflog_ent_fn fn, + void *cb_data) +{ + struct ref_store *refs = get_ref_store(NULL); + + return refs->be->for_each_reflog_ent(refs, refname, fn, cb_data); +} + +int reflog_exists(const char *refname) +{ + struct ref_store *refs = get_ref_store(NULL); + + return refs->be->reflog_exists(refs, refname); +} + +int safe_create_reflog(const char *refname, int force_create, + struct strbuf *err) +{ + struct ref_store *refs = get_ref_store(NULL); + + return refs->be->create_reflog(refs, refname, force_create, err); +} + +int delete_reflog(const char *refname) +{ + struct ref_store *refs = get_ref_store(NULL); + + return refs->be->delete_reflog(refs, refname); +} + +int reflog_expire(const char *refname, const unsigned char *sha1, + unsigned int flags, + reflog_expiry_prepare_fn prepare_fn, + reflog_expiry_should_prune_fn should_prune_fn, + reflog_expiry_cleanup_fn cleanup_fn, + void *policy_cb_data) +{ + struct ref_store *refs = get_ref_store(NULL); + + return refs->be->reflog_expire(refs, refname, sha1, flags, + prepare_fn, should_prune_fn, + cleanup_fn, policy_cb_data); +} + +int initial_ref_transaction_commit(struct ref_transaction *transaction, + struct strbuf *err) +{ + struct ref_store *refs = get_ref_store(NULL); + + return refs->be->initial_transaction_commit(refs, transaction, err); +} + +int delete_refs(struct string_list *refnames, unsigned int flags) +{ + struct ref_store *refs = get_ref_store(NULL); + + return refs->be->delete_refs(refs, refnames, flags); +} + +int rename_ref(const char *oldref, const char *newref, const char *logmsg) +{ + struct ref_store *refs = get_ref_store(NULL); + + return refs->be->rename_ref(refs, oldref, newref, logmsg); +} |