#ifndef REFS_H
#define REFS_H
+struct object_id;
+struct ref_store;
+struct strbuf;
+struct string_list;
+struct worktree;
+
/*
* Resolve a reference, recursively following symbolic refererences.
*
- * Store the referred-to object's name in sha1 and return the name of
- * the non-symbolic reference that ultimately pointed at it. The
- * return value, if not NULL, is a pointer into either a static buffer
- * or the input ref.
+ * Return the name of the non-symbolic reference that ultimately pointed
+ * at the resolved object name. The return value, if not NULL, is a
+ * pointer into either a static buffer or the input ref.
+ *
+ * If sha1 is non-NULL, store the referred-to object's name in it.
*
* If the reference cannot be resolved to an object, the behavior
* depends on the RESOLVE_REF_READING flag:
#define RESOLVE_REF_NO_RECURSE 0x02
#define RESOLVE_REF_ALLOW_BAD_NAME 0x04
+const char *refs_resolve_ref_unsafe(struct ref_store *refs,
+ const char *refname,
+ int resolve_flags,
+ unsigned char *sha1,
+ int *flags);
const char *resolve_ref_unsafe(const char *refname, int resolve_flags,
unsigned char *sha1, int *flags);
+char *refs_resolve_refdup(struct ref_store *refs,
+ const char *refname, int resolve_flags,
+ unsigned char *sha1, int *flags);
char *resolve_refdup(const char *refname, int resolve_flags,
unsigned char *sha1, int *flags);
+int refs_read_ref_full(struct ref_store *refs, const char *refname,
+ int resolve_flags, unsigned char *sha1, int *flags);
int read_ref_full(const char *refname, int resolve_flags,
unsigned char *sha1, int *flags);
int read_ref(const char *refname, unsigned char *sha1);
+/*
+ * Return 0 if a reference named refname could be created without
+ * conflicting with the name of an existing reference. Otherwise,
+ * return a negative value and write an explanation to err. If extras
+ * is non-NULL, it is a list of additional refnames with which refname
+ * is not allowed to conflict. If skip is non-NULL, ignore potential
+ * conflicts with refs in skip (e.g., because they are scheduled for
+ * deletion in the same operation). Behavior is undefined if the same
+ * name is listed in both extras and skip.
+ *
+ * Two reference names conflict if one of them exactly matches the
+ * leading components of the other; e.g., "foo/bar" conflicts with
+ * both "foo" and with "foo/bar/baz" but not with "foo/bar" or
+ * "foo/barbados".
+ *
+ * extras and skip must be sorted.
+ */
+
+int refs_verify_refname_available(struct ref_store *refs,
+ const char *refname,
+ const struct string_list *extras,
+ const struct string_list *skip,
+ struct strbuf *err);
+
int ref_exists(const char *refname);
int should_autocreate_reflog(const char *refname);
* Symbolic references are considered unpeelable, even if they
* ultimately resolve to a peelable tag.
*/
+int refs_peel_ref(struct ref_store *refs, const char *refname,
+ unsigned char *sha1);
int peel_ref(const char *refname, unsigned char *sha1);
/**
int dwim_log(const char *str, int len, unsigned char *sha1, char **ref);
/*
- * A ref_transaction represents a collection of ref updates
- * that should succeed or fail together.
+ * A ref_transaction represents a collection of reference updates that
+ * should succeed or fail together.
*
* Calling sequence
* ----------------
+ *
* - Allocate and initialize a `struct ref_transaction` by calling
* `ref_transaction_begin()`.
*
- * - List intended ref updates by calling functions like
- * `ref_transaction_update()` and `ref_transaction_create()`.
- *
- * - Call `ref_transaction_commit()` to execute the transaction.
- * If this succeeds, the ref updates will have taken place and
- * the transaction cannot be rolled back.
- *
- * - Instead of `ref_transaction_commit`, use
- * `initial_ref_transaction_commit()` if the ref database is known
- * to be empty (e.g. during clone). This is likely to be much
- * faster.
- *
- * - At any time call `ref_transaction_free()` to discard the
- * transaction and free associated resources. In particular,
- * this rolls back the transaction if it has not been
- * successfully committed.
+ * - Specify the intended ref updates by calling one or more of the
+ * following functions:
+ * - `ref_transaction_update()`
+ * - `ref_transaction_create()`
+ * - `ref_transaction_delete()`
+ * - `ref_transaction_verify()`
+ *
+ * - Then either:
+ *
+ * - Optionally call `ref_transaction_prepare()` to prepare the
+ * transaction. This locks all references, checks preconditions,
+ * etc. but doesn't finalize anything. If this step fails, the
+ * transaction has been closed and can only be freed. If this step
+ * succeeds, then `ref_transaction_commit()` is almost certain to
+ * succeed. However, you can still call `ref_transaction_abort()`
+ * if you decide not to commit the transaction after all.
+ *
+ * - Call `ref_transaction_commit()` to execute the transaction,
+ * make the changes permanent, and release all locks. If you
+ * haven't already called `ref_transaction_prepare()`, then
+ * `ref_transaction_commit()` calls it for you.
+ *
+ * Or
+ *
+ * - Call `initial_ref_transaction_commit()` if the ref database is
+ * known to be empty and have no other writers (e.g. during
+ * clone). This is likely to be much faster than
+ * `ref_transaction_commit()`. `ref_transaction_prepare()` should
+ * *not* be called before `initial_ref_transaction_commit()`.
+ *
+ * - Then finally, call `ref_transaction_free()` to free the
+ * `ref_transaction` data structure.
+ *
+ * At any time before calling `ref_transaction_commit()`, you can call
+ * `ref_transaction_abort()` to abort the transaction, rollback any
+ * locks, and free any associated resources (including the
+ * `ref_transaction` data structure).
+ *
+ * Putting it all together, a complete reference update looks like
+ *
+ * struct ref_transaction *transaction;
+ * struct strbuf err = STRBUF_INIT;
+ * int ret = 0;
+ *
+ * transaction = ref_store_transaction_begin(refs, &err);
+ * if (!transaction ||
+ * ref_transaction_update(...) ||
+ * ref_transaction_create(...) ||
+ * ...etc... ||
+ * ref_transaction_commit(transaction, &err)) {
+ * error("%s", err.buf);
+ * ret = -1;
+ * }
+ * ref_transaction_free(transaction);
+ * strbuf_release(&err);
+ * return ret;
*
* Error handling
* --------------
* -------
*
* Note that no locks are taken, and no refs are read, until
- * `ref_transaction_commit` is called. So `ref_transaction_verify`
- * won't report a verification failure until the commit is attempted.
+ * `ref_transaction_prepare()` or `ref_transaction_commit()` is
+ * called. So, for example, `ref_transaction_verify()` won't report a
+ * verification failure until the commit is attempted.
*/
struct ref_transaction;
* it is not safe to modify references while an iteration is in
* progress, unless the same callback function invocation that
* modifies the reference also returns a nonzero value to immediately
- * stop the iteration.
+ * stop the iteration. Returned references are sorted.
*/
+int refs_head_ref(struct ref_store *refs,
+ each_ref_fn fn, void *cb_data);
+int refs_for_each_ref(struct ref_store *refs,
+ each_ref_fn fn, void *cb_data);
+int refs_for_each_ref_in(struct ref_store *refs, const char *prefix,
+ each_ref_fn fn, void *cb_data);
+int refs_for_each_tag_ref(struct ref_store *refs,
+ each_ref_fn fn, void *cb_data);
+int refs_for_each_branch_ref(struct ref_store *refs,
+ each_ref_fn fn, void *cb_data);
+int refs_for_each_remote_ref(struct ref_store *refs,
+ each_ref_fn fn, void *cb_data);
+
int head_ref(each_ref_fn fn, void *cb_data);
int for_each_ref(each_ref_fn fn, void *cb_data);
int for_each_ref_in(const char *prefix, each_ref_fn fn, void *cb_data);
+int refs_for_each_fullref_in(struct ref_store *refs, const char *prefix,
+ each_ref_fn fn, void *cb_data,
+ unsigned int broken);
int for_each_fullref_in(const char *prefix, each_ref_fn fn, void *cb_data,
unsigned int broken);
int for_each_tag_ref(each_ref_fn fn, void *cb_data);
int for_each_glob_ref_in(each_ref_fn fn, const char *pattern,
const char *prefix, void *cb_data);
-int head_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data);
-int for_each_ref_submodule(const char *submodule,
- each_ref_fn fn, void *cb_data);
-int for_each_ref_in_submodule(const char *submodule, const char *prefix,
- each_ref_fn fn, void *cb_data);
-int for_each_tag_ref_submodule(const char *submodule,
- each_ref_fn fn, void *cb_data);
-int for_each_branch_ref_submodule(const char *submodule,
- each_ref_fn fn, void *cb_data);
-int for_each_remote_ref_submodule(const char *submodule,
- each_ref_fn fn, void *cb_data);
-
int head_ref_namespaced(each_ref_fn fn, void *cb_data);
int for_each_namespaced_ref(each_ref_fn fn, void *cb_data);
/* can be used to learn about broken ref and symref */
+int refs_for_each_rawref(struct ref_store *refs, each_ref_fn fn, void *cb_data);
int for_each_rawref(each_ref_fn fn, void *cb_data);
static inline const char *has_glob_specials(const char *pattern)
* Write a packed-refs file for the current repository.
* flags: Combination of the above PACK_REFS_* flags.
*/
-int pack_refs(unsigned int flags);
+int refs_pack_refs(struct ref_store *refs, unsigned int flags);
/*
* Flags controlling ref_transaction_update(), ref_transaction_create(), etc.
#define REF_NODEREF 0x01
#define REF_FORCE_CREATE_REFLOG 0x40
+/*
+ * Flags that can be passed in to ref_transaction_update
+ */
+#define REF_TRANSACTION_UPDATE_ALLOWED_FLAGS \
+ REF_ISPRUNING | \
+ REF_FORCE_CREATE_REFLOG | \
+ REF_NODEREF
+
/*
* Setup reflog before using. Fill in err and return -1 on failure.
*/
+int refs_create_reflog(struct ref_store *refs, const char *refname,
+ int force_create, struct strbuf *err);
int safe_create_reflog(const char *refname, int force_create, struct strbuf *err);
/** Reads log for the value of ref during at_time. **/
int read_ref_at(const char *refname, unsigned int flags,
- unsigned long at_time, int cnt,
+ timestamp_t at_time, int cnt,
unsigned char *sha1, char **msg,
- unsigned long *cutoff_time, int *cutoff_tz, int *cutoff_cnt);
+ timestamp_t *cutoff_time, int *cutoff_tz, int *cutoff_cnt);
/** Check if a particular reflog exists */
+int refs_reflog_exists(struct ref_store *refs, const char *refname);
int reflog_exists(const char *refname);
/*
* verify that the current value of the reference is old_sha1 before
* deleting it. If old_sha1 is NULL, delete the reference if it
* exists, regardless of its old value. It is an error for old_sha1 to
- * be NULL_SHA1. flags is passed through to ref_transaction_delete().
+ * be NULL_SHA1. msg and flags are passed through to
+ * ref_transaction_delete().
*/
-int delete_ref(const char *refname, const unsigned char *old_sha1,
- unsigned int flags);
+int refs_delete_ref(struct ref_store *refs, const char *msg,
+ const char *refname,
+ const unsigned char *old_sha1,
+ unsigned int flags);
+int delete_ref(const char *msg, const char *refname,
+ const unsigned char *old_sha1, unsigned int flags);
/*
* Delete the specified references. If there are any problems, emit
* errors but attempt to keep going (i.e., the deletes are not done in
- * an all-or-nothing transaction). flags is passed through to
+ * an all-or-nothing transaction). msg and flags are passed through to
* ref_transaction_delete().
*/
-int delete_refs(struct string_list *refnames, unsigned int flags);
+int refs_delete_refs(struct ref_store *refs, const char *msg,
+ struct string_list *refnames, unsigned int flags);
+int delete_refs(const char *msg, struct string_list *refnames,
+ unsigned int flags);
/** Delete a reflog */
+int refs_delete_reflog(struct ref_store *refs, const char *refname);
int delete_reflog(const char *refname);
/* iterate over reflog entries */
typedef int each_reflog_ent_fn(
- unsigned char *old_sha1, unsigned char *new_sha1,
- const char *committer, unsigned long timestamp,
+ struct object_id *old_oid, struct object_id *new_oid,
+ const char *committer, timestamp_t timestamp,
int tz, const char *msg, void *cb_data);
+int refs_for_each_reflog_ent(struct ref_store *refs, const char *refname,
+ each_reflog_ent_fn fn, void *cb_data);
+int refs_for_each_reflog_ent_reverse(struct ref_store *refs,
+ const char *refname,
+ each_reflog_ent_fn fn,
+ void *cb_data);
int for_each_reflog_ent(const char *refname, each_reflog_ent_fn fn, void *cb_data);
int for_each_reflog_ent_reverse(const char *refname, each_reflog_ent_fn fn, void *cb_data);
/*
* Calls the specified function for each reflog file until it returns nonzero,
- * and returns the value
+ * and returns the value. Reflog file order is unspecified.
*/
+int refs_for_each_reflog(struct ref_store *refs, each_ref_fn fn, void *cb_data);
int for_each_reflog(each_ref_fn fn, void *cb_data);
#define REFNAME_ALLOW_ONELEVEL 1
char *shorten_unambiguous_ref(const char *refname, int strict);
/** rename ref, return 0 on success **/
+int refs_rename_ref(struct ref_store *refs, const char *oldref,
+ const char *newref, const char *logmsg);
int rename_ref(const char *oldref, const char *newref, const char *logmsg);
+int refs_create_symref(struct ref_store *refs, const char *refname,
+ const char *target, const char *logmsg);
int create_symref(const char *refname, const char *target, const char *logmsg);
-/*
- * Update HEAD of the specified gitdir.
- * Similar to create_symref("relative-git-dir/HEAD", target, NULL), but
- * this can update the main working tree's HEAD regardless of where
- * $GIT_DIR points to.
- * Return 0 if successful, non-zero otherwise.
- * */
-int set_worktree_head_symref(const char *gitdir, const char *target);
-
enum action_on_err {
UPDATE_REFS_MSG_ON_ERR,
UPDATE_REFS_DIE_ON_ERR,
* Begin a reference transaction. The reference transaction must
* be freed by calling ref_transaction_free().
*/
+struct ref_transaction *ref_store_transaction_begin(struct ref_store *refs,
+ struct strbuf *err);
struct ref_transaction *ref_transaction_begin(struct strbuf *err);
/*
*
* refname -- the name of the reference to be affected.
*
+ * new_sha1 -- the SHA-1 that should be set to be the new value of
+ * the reference. Some functions allow this parameter to be
+ * NULL, meaning that the reference is not changed, or
+ * null_sha1, meaning that the reference should be deleted. A
+ * copy of this value is made in the transaction.
+ *
+ * old_sha1 -- the SHA-1 value that the reference must have before
+ * the update. Some functions allow this parameter to be NULL,
+ * meaning that the old value of the reference is not checked,
+ * or null_sha1, meaning that the reference must not exist
+ * before the update. A copy of this value is made in the
+ * transaction.
+ *
* flags -- flags affecting the update, passed to
* update_ref_lock(). Can be REF_NODEREF, which means that
* symbolic references should not be followed.
unsigned int flags,
struct strbuf *err);
-/*
- * Commit all of the changes that have been queued in transaction, as
- * atomically as possible.
- *
- * Returns 0 for success, or one of the below error codes for errors.
- */
/* Naming conflict (for example, the ref names A and A/B conflict). */
#define TRANSACTION_NAME_CONFLICT -1
/* All other errors. */
#define TRANSACTION_GENERIC_ERROR -2
+
+/*
+ * Perform the preparatory stages of committing `transaction`. Acquire
+ * any needed locks, check preconditions, etc.; basically, do as much
+ * as possible to ensure that the transaction will be able to go
+ * through, stopping just short of making any irrevocable or
+ * user-visible changes. The updates that this function prepares can
+ * be finished up by calling `ref_transaction_commit()` or rolled back
+ * by calling `ref_transaction_abort()`.
+ *
+ * On success, return 0 and leave the transaction in "prepared" state.
+ * On failure, abort the transaction, write an error message to `err`,
+ * and return one of the `TRANSACTION_*` constants.
+ *
+ * Callers who don't need such fine-grained control over committing
+ * reference transactions should just call `ref_transaction_commit()`.
+ */
+int ref_transaction_prepare(struct ref_transaction *transaction,
+ struct strbuf *err);
+
+/*
+ * Commit all of the changes that have been queued in transaction, as
+ * atomically as possible. On success, return 0 and leave the
+ * transaction in "closed" state. On failure, roll back the
+ * transaction, write an error message to `err`, and return one of the
+ * `TRANSACTION_*` constants
+ */
int ref_transaction_commit(struct ref_transaction *transaction,
struct strbuf *err);
+/*
+ * Abort `transaction`, which has been begun and possibly prepared,
+ * but not yet committed.
+ */
+int ref_transaction_abort(struct ref_transaction *transaction,
+ struct strbuf *err);
+
/*
* Like ref_transaction_commit(), but optimized for creating
* references when originally initializing a repository (e.g., by "git
struct strbuf *err);
/*
- * Free an existing transaction and all associated data.
+ * Free `*transaction` and all associated data.
*/
void ref_transaction_free(struct ref_transaction *transaction);
* ref_transaction_update(). Handle errors as requested by the `onerr`
* argument.
*/
+int refs_update_ref(struct ref_store *refs, const char *msg, const char *refname,
+ const unsigned char *new_sha1, const unsigned char *old_sha1,
+ unsigned int flags, enum action_on_err 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);
* unlocked again.
*/
typedef void reflog_expiry_prepare_fn(const char *refname,
- const unsigned char *sha1,
+ const struct object_id *oid,
void *cb_data);
-typedef int reflog_expiry_should_prune_fn(unsigned char *osha1,
- unsigned char *nsha1,
+typedef int reflog_expiry_should_prune_fn(struct object_id *ooid,
+ struct object_id *noid,
const char *email,
- unsigned long timestamp, int tz,
+ timestamp_t timestamp, int tz,
const char *message, void *cb_data);
typedef void reflog_expiry_cleanup_fn(void *cb_data);
* enum expire_reflog_flags. The three function pointers are described
* above. On success, return zero.
*/
+int refs_reflog_expire(struct ref_store *refs,
+ 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);
int reflog_expire(const char *refname, const unsigned char *sha1,
unsigned int flags,
reflog_expiry_prepare_fn prepare_fn,
int ref_storage_backend_exists(const char *name);
+struct ref_store *get_main_ref_store(void);
+/*
+ * Return the ref_store instance for the specified submodule. For the
+ * main repository, use submodule==NULL; such a call cannot fail. For
+ * a submodule, the submodule must exist and be a nonbare repository,
+ * otherwise return NULL. If the requested reference store has not yet
+ * been initialized, initialize it first.
+ *
+ * For backwards compatibility, submodule=="" is treated the same as
+ * submodule==NULL.
+ */
+struct ref_store *get_submodule_ref_store(const char *submodule);
+struct ref_store *get_worktree_ref_store(const struct worktree *wt);
+
#endif /* REFS_H */