#ifndef REFS_H
#define REFS_H
-struct ref_lock {
- char *ref_name;
- char *orig_ref_name;
- struct lock_file *lk;
- unsigned char old_sha1[20];
- int lock_fd;
- int force_write;
-};
+/*
+ * 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.
+ *
+ * If the reference cannot be resolved to an object, the behavior
+ * depends on the RESOLVE_REF_READING flag:
+ *
+ * - If RESOLVE_REF_READING is set, return NULL.
+ *
+ * - If RESOLVE_REF_READING is not set, clear sha1 and return the name of
+ * the last reference name in the chain, which will either be a non-symbolic
+ * reference or an undefined reference. If this is a prelude to
+ * "writing" to the ref, the return value is the name of the ref
+ * that will actually be created or changed.
+ *
+ * If the RESOLVE_REF_NO_RECURSE flag is passed, only resolves one
+ * level of symbolic reference. The value stored in sha1 for a symbolic
+ * reference will always be null_sha1 in this case, and the return
+ * value is the reference that the symref refers to directly.
+ *
+ * If flags is non-NULL, set the value that it points to the
+ * combination of REF_ISPACKED (if the reference was found among the
+ * packed references), REF_ISSYMREF (if the initial reference was a
+ * symbolic reference), REF_BAD_NAME (if the reference name is ill
+ * formed --- see RESOLVE_REF_ALLOW_BAD_NAME below), and REF_ISBROKEN
+ * (if the ref is malformed or has a bad name). See refs.h for more detail
+ * on each flag.
+ *
+ * If ref is not a properly-formatted, normalized reference, return
+ * NULL. If more than MAXDEPTH recursive symbolic lookups are needed,
+ * give up and return NULL.
+ *
+ * RESOLVE_REF_ALLOW_BAD_NAME allows resolving refs even when their
+ * name is invalid according to git-check-ref-format(1). If the name
+ * is bad then the value stored in sha1 will be null_sha1 and the two
+ * flags REF_ISBROKEN and REF_BAD_NAME will be set.
+ *
+ * Even with RESOLVE_REF_ALLOW_BAD_NAME, names that escape the refs/
+ * directory and do not consist of all caps and underscores cannot be
+ * resolved. The function returns NULL for such ref names.
+ * Caps and underscores refers to the special refs, such as HEAD,
+ * FETCH_HEAD and friends, that all live outside of the refs/ directory.
+ */
+#define RESOLVE_REF_READING 0x01
+#define RESOLVE_REF_NO_RECURSE 0x02
+#define RESOLVE_REF_ALLOW_BAD_NAME 0x04
+
+extern const char *resolve_ref_unsafe(const char *refname, int resolve_flags,
+ unsigned char *sha1, int *flags);
+
+extern char *resolve_refdup(const char *refname, int resolve_flags,
+ unsigned char *sha1, int *flags);
+
+extern int read_ref_full(const char *refname, int resolve_flags,
+ unsigned char *sha1, int *flags);
+extern int read_ref(const char *refname, unsigned char *sha1);
+
+extern int ref_exists(const char *refname);
+
+extern int is_branch(const char *refname);
+
+/*
+ * If refname is a non-symbolic reference that refers to a tag object,
+ * and the tag can be (recursively) dereferenced to a non-tag object,
+ * store the SHA1 of the referred-to object to sha1 and return 0. If
+ * any of these conditions are not met, return a non-zero value.
+ * Symbolic references are considered unpeelable, even if they
+ * ultimately resolve to a peelable tag.
+ */
+extern int peel_ref(const char *refname, unsigned char *sha1);
+
+/**
+ * Resolve refname in the nested "gitlink" repository that is located
+ * at path. If the resolution is successful, return 0 and set sha1 to
+ * the name of the object; otherwise, return a non-zero value.
+ */
+extern int resolve_gitlink_ref(const char *path, const char *refname, unsigned char *sha1);
+
+/*
+ * Return true iff abbrev_name is a possible abbreviation for
+ * full_name according to the rules defined by ref_rev_parse_rules in
+ * refs.c.
+ */
+extern int refname_match(const char *abbrev_name, const char *full_name);
+
+extern int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref);
+extern int dwim_log(const char *str, int len, unsigned char *sha1, char **ref);
/*
* A ref_transaction represents a collection of ref updates
* single callback invocation.
*/
typedef int each_ref_fn(const char *refname,
- const unsigned char *sha1, int flags, void *cb_data);
+ const struct object_id *oid, int flags, void *cb_data);
/*
* The following functions invoke the specified callback function for
* modifies the reference also returns a nonzero value to immediately
* stop the iteration.
*/
-extern int head_ref(each_ref_fn, void *);
-extern int for_each_ref(each_ref_fn, void *);
-extern int for_each_ref_in(const char *, each_ref_fn, void *);
-extern int for_each_tag_ref(each_ref_fn, void *);
-extern int for_each_branch_ref(each_ref_fn, void *);
-extern int for_each_remote_ref(each_ref_fn, void *);
-extern int for_each_replace_ref(each_ref_fn, void *);
-extern int for_each_glob_ref(each_ref_fn, const char *pattern, void *);
-extern int for_each_glob_ref_in(each_ref_fn, const char *pattern, const char* prefix, void *);
+extern int head_ref(each_ref_fn fn, void *cb_data);
+extern int for_each_ref(each_ref_fn fn, void *cb_data);
+extern int for_each_ref_in(const char *prefix, each_ref_fn fn, void *cb_data);
+extern int for_each_fullref_in(const char *prefix, each_ref_fn fn, void *cb_data, unsigned int broken);
+extern int for_each_tag_ref(each_ref_fn fn, void *cb_data);
+extern int for_each_branch_ref(each_ref_fn fn, void *cb_data);
+extern int for_each_remote_ref(each_ref_fn fn, void *cb_data);
+extern int for_each_replace_ref(each_ref_fn fn, void *cb_data);
+extern int for_each_glob_ref(each_ref_fn fn, const char *pattern, void *cb_data);
+extern int for_each_glob_ref_in(each_ref_fn fn, const char *pattern, const char *prefix, void *cb_data);
extern int head_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data);
extern int for_each_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data);
extern int head_ref_namespaced(each_ref_fn fn, void *cb_data);
extern int for_each_namespaced_ref(each_ref_fn fn, void *cb_data);
+/* can be used to learn about broken ref and symref */
+extern int for_each_rawref(each_ref_fn fn, void *cb_data);
+
static inline const char *has_glob_specials(const char *pattern)
{
return strpbrk(pattern, "?*[");
}
-/* can be used to learn about broken ref and symref */
-extern int for_each_rawref(each_ref_fn, void *);
-
extern void warn_dangling_symref(FILE *fp, const char *msg_fmt, const char *refname);
extern void warn_dangling_symrefs(FILE *fp, const char *msg_fmt, const struct string_list *refnames);
-/*
- * Lock the packed-refs file for writing. Flags is passed to
- * hold_lock_file_for_update(). Return 0 on success.
- * Errno is set to something meaningful on error.
- */
-extern int lock_packed_refs(int flags);
-
-/*
- * Add a reference to the in-memory packed reference cache. This may
- * only be called while the packed-refs file is locked (see
- * lock_packed_refs()). To actually write the packed-refs file, call
- * commit_packed_refs().
- */
-extern void add_packed_ref(const char *refname, const unsigned char *sha1);
-
-/*
- * Write the current version of the packed refs cache from memory to
- * disk. The packed-refs file must already be locked for writing (see
- * lock_packed_refs()). Return zero on success.
- * Sets errno to something meaningful on error.
- */
-extern int commit_packed_refs(void);
-
-/*
- * Rollback the lockfile for the packed-refs file, and discard the
- * in-memory packed reference cache. (The packed-refs file will be
- * read anew if it is needed again after this function is called.)
- */
-extern void rollback_packed_refs(void);
-
/*
* Flags for controlling behaviour of pack_refs()
* PACK_REFS_PRUNE: Prune loose refs after packing
int pack_refs(unsigned int flags);
/*
- * Rewrite the packed-refs file, omitting any refs listed in
- * 'refnames'. On error, packed-refs will be unchanged, the return
- * value is nonzero, and a message about the error is written to the
- * 'err' strbuf.
- *
- * The refs in 'refnames' needn't be sorted. `err` must not be NULL.
- */
-extern int repack_without_refs(struct string_list *refnames,
- struct strbuf *err);
-
-extern int ref_exists(const char *);
-
-extern int is_branch(const char *refname);
-
-/*
- * If refname is a non-symbolic reference that refers to a tag object,
- * and the tag can be (recursively) dereferenced to a non-tag object,
- * store the SHA1 of the referred-to object to sha1 and return 0. If
- * any of these conditions are not met, return a non-zero value.
- * Symbolic references are considered unpeelable, even if they
- * ultimately resolve to a peelable tag.
- */
-extern int peel_ref(const char *refname, unsigned char *sha1);
-
-/*
- * Flags controlling lock_any_ref_for_update(), ref_transaction_update(),
- * ref_transaction_create(), etc.
+ * Flags controlling ref_transaction_update(), ref_transaction_create(), etc.
* REF_NODEREF: act on the ref directly, instead of dereferencing
* symbolic references.
- * REF_DELETING: tolerate broken refs
*
- * Flags >= 0x100 are reserved for internal use.
+ * Other flags are reserved for internal use.
*/
#define REF_NODEREF 0x01
-#define REF_DELETING 0x02
-/*
- * This function sets errno to something meaningful on failure.
- */
-extern struct ref_lock *lock_any_ref_for_update(const char *refname,
- const unsigned char *old_sha1,
- int flags, int *type_p);
-
-/** Close the file descriptor owned by a lock and return the status */
-extern int close_ref(struct ref_lock *lock);
-
-/** Close and commit the ref locked by the lock */
-extern int commit_ref(struct ref_lock *lock);
-
-/** Release any lock taken but not written. **/
-extern void unlock_ref(struct ref_lock *lock);
+#define REF_FORCE_CREATE_REFLOG 0x40
/*
- * Setup reflog before using. Set errno to something meaningful on failure.
+ * Setup reflog before using. Fill in err and return -1 on failure.
*/
-int log_ref_setup(const char *refname, char *logfile, int bufsize);
+int safe_create_reflog(const char *refname, int force_create, struct strbuf *err);
/** Reads log for the value of ref during at_time. **/
extern int read_ref_at(const char *refname, unsigned int flags,
/** Check if a particular reflog exists */
extern int reflog_exists(const char *refname);
+/*
+ * Delete the specified reference. If old_sha1 is non-NULL, then
+ * 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().
+ */
+extern int delete_ref(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).
+ */
+extern int delete_refs(struct string_list *refnames);
+
/** Delete a reflog */
extern int delete_reflog(const char *refname);
* to the rules described in Documentation/git-check-ref-format.txt.
* If REFNAME_ALLOW_ONELEVEL is set in flags, then accept one-level
* reference names. If REFNAME_REFSPEC_PATTERN is set in flags, then
- * allow a "*" wildcard character in place of one of the name
- * components. No leading or repeated slashes are accepted.
+ * allow a single "*" wildcard character in the refspec. No leading or
+ * repeated slashes are accepted.
*/
extern int check_refname_format(const char *refname, int flags);
extern const char *prettify_refname(const char *refname);
+
extern char *shorten_unambiguous_ref(const char *refname, int strict);
/** rename ref, return 0 on success **/
extern int rename_ref(const char *oldref, const char *newref, const char *logmsg);
-/**
- * Resolve refname in the nested "gitlink" repository that is located
- * at path. If the resolution is successful, return 0 and set sha1 to
- * the name of the object; otherwise, return a non-zero value.
- */
-extern int resolve_gitlink_ref(const char *path, const char *refname, unsigned char *sha1);
+extern int create_symref(const char *ref, const char *refs_heads_master, const char *logmsg);
enum action_on_err {
UPDATE_REFS_MSG_ON_ERR,
struct ref_transaction *ref_transaction_begin(struct strbuf *err);
/*
- * The following functions add a reference check or update to a
- * ref_transaction. In all of them, refname is the name of the
- * reference to be affected. The functions make internal copies of
- * refname and msg, so the caller retains ownership of these parameters.
- * flags can be REF_NODEREF; it is passed to update_ref_lock().
+ * Reference transaction updates
+ *
+ * The following four functions add a reference check or update to a
+ * ref_transaction. They have some common similar parameters:
+ *
+ * transaction -- a pointer to an open ref_transaction, obtained
+ * from ref_transaction_begin().
+ *
+ * refname -- the name of the reference to be affected.
+ *
+ * flags -- flags affecting the update, passed to
+ * update_ref_lock(). Can be REF_NODEREF, which means that
+ * symbolic references should not be followed.
+ *
+ * msg -- a message describing the change (for the reflog).
+ *
+ * err -- a strbuf for receiving a description of any error that
+ * might have occured.
+ *
+ * The functions make internal copies of refname and msg, so the
+ * caller retains ownership of these parameters.
+ *
+ * The functions return 0 on success and non-zero on failure. A
+ * failure means that the transaction as a whole has failed and needs
+ * to be rolled back.
*/
/*
- * Add a reference update to transaction. new_sha1 is the value that
- * the reference should have after the update, or zeros if it should
- * be deleted. If have_old is true, then old_sha1 holds the value
- * that the reference should have had before the update, or zeros if
- * it must not have existed beforehand.
- * Function returns 0 on success and non-zero on failure. A failure to update
- * means that the transaction as a whole has failed and will need to be
- * rolled back.
+ * Add a reference update to transaction. new_sha1 is the value that
+ * the reference should have after the update, or null_sha1 if it
+ * should be deleted. If new_sha1 is NULL, then the reference is not
+ * changed at all. old_sha1 is the value that the reference must have
+ * before the update, or null_sha1 if it must not have existed
+ * beforehand. The old value is checked after the lock is taken to
+ * prevent races. If the old value doesn't agree with old_sha1, the
+ * whole transaction fails. If old_sha1 is NULL, then the previous
+ * value is not checked.
+ *
+ * See the above comment "Reference transaction updates" for more
+ * information.
*/
int ref_transaction_update(struct ref_transaction *transaction,
const char *refname,
const unsigned char *new_sha1,
const unsigned char *old_sha1,
- int flags, int have_old, const char *msg,
+ unsigned int flags, const char *msg,
struct strbuf *err);
/*
- * Add a reference creation to transaction. new_sha1 is the value
- * that the reference should have after the update; it must not be the
- * null SHA-1. It is verified that the reference does not exist
+ * Add a reference creation to transaction. new_sha1 is the value that
+ * the reference should have after the update; it must not be
+ * null_sha1. It is verified that the reference does not exist
* already.
- * Function returns 0 on success and non-zero on failure. A failure to create
- * means that the transaction as a whole has failed and will need to be
- * rolled back.
+ *
+ * See the above comment "Reference transaction updates" for more
+ * information.
*/
int ref_transaction_create(struct ref_transaction *transaction,
const char *refname,
const unsigned char *new_sha1,
- int flags, const char *msg,
+ unsigned int flags, const char *msg,
struct strbuf *err);
/*
- * Add a reference deletion to transaction. If have_old is true, then
- * old_sha1 holds the value that the reference should have had before
- * the update (which must not be the null SHA-1).
- * Function returns 0 on success and non-zero on failure. A failure to delete
- * means that the transaction as a whole has failed and will need to be
- * rolled back.
+ * Add a reference deletion to transaction. If old_sha1 is non-NULL,
+ * then it holds the value that the reference should have had before
+ * the update (which must not be null_sha1).
+ *
+ * See the above comment "Reference transaction updates" for more
+ * information.
*/
int ref_transaction_delete(struct ref_transaction *transaction,
const char *refname,
const unsigned char *old_sha1,
- int flags, int have_old, const char *msg,
+ unsigned int flags, const char *msg,
+ struct strbuf *err);
+
+/*
+ * Verify, within a transaction, that refname has the value old_sha1,
+ * or, if old_sha1 is null_sha1, then verify that the reference
+ * doesn't exist. old_sha1 must be non-NULL.
+ *
+ * See the above comment "Reference transaction updates" for more
+ * information.
+ */
+int ref_transaction_verify(struct ref_transaction *transaction,
+ const char *refname,
+ const unsigned char *old_sha1,
+ unsigned int flags,
struct strbuf *err);
/*
int ref_transaction_commit(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
+ * clone"). It writes the new references directly to packed-refs
+ * without locking the individual references.
+ *
+ * It is a bug to call this function when there might be other
+ * processes accessing the repository or if there are existing
+ * references that might conflict with the ones being created. All
+ * old_sha1 values must either be absent or NULL_SHA1.
+ */
+int initial_ref_transaction_commit(struct ref_transaction *transaction,
+ struct strbuf *err);
+
/*
* Free an existing transaction and all associated data.
*/
void ref_transaction_free(struct ref_transaction *transaction);
-/** Lock a ref and then write its file */
-int update_ref(const char *action, const char *refname,
- const unsigned char *sha1, const unsigned char *oldval,
- int flags, enum action_on_err onerr);
+/**
+ * Lock, update, and unlock a single reference. This function
+ * basically does a transaction containing a single call to
+ * ref_transaction_update(). The parameters to this function have the
+ * same meaning as the corresponding parameters to
+ * ref_transaction_update(). Handle errors as requested by the `onerr`
+ * argument.
+ */
+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);
extern int parse_hide_refs_config(const char *var, const char *value, const char *);
+
extern int ref_is_hidden(const char *);
+enum ref_type {
+ REF_TYPE_PER_WORKTREE,
+ REF_TYPE_PSEUDOREF,
+ REF_TYPE_NORMAL,
+};
+
+enum ref_type ref_type(const char *refname);
+
+enum expire_reflog_flags {
+ EXPIRE_REFLOGS_DRY_RUN = 1 << 0,
+ EXPIRE_REFLOGS_UPDATE_REF = 1 << 1,
+ EXPIRE_REFLOGS_VERBOSE = 1 << 2,
+ EXPIRE_REFLOGS_REWRITE = 1 << 3
+};
+
+/*
+ * The following interface is used for reflog expiration. The caller
+ * calls reflog_expire(), supplying it with three callback functions,
+ * of the following types. The callback functions define the
+ * expiration policy that is desired.
+ *
+ * reflog_expiry_prepare_fn -- Called once after the reference is
+ * locked.
+ *
+ * reflog_expiry_should_prune_fn -- Called once for each entry in the
+ * existing reflog. It should return true iff that entry should be
+ * pruned.
+ *
+ * reflog_expiry_cleanup_fn -- Called once before the reference is
+ * unlocked again.
+ */
+typedef void reflog_expiry_prepare_fn(const char *refname,
+ const unsigned char *sha1,
+ void *cb_data);
+typedef int reflog_expiry_should_prune_fn(unsigned char *osha1,
+ unsigned char *nsha1,
+ const char *email,
+ unsigned long timestamp, int tz,
+ const char *message, void *cb_data);
+typedef void reflog_expiry_cleanup_fn(void *cb_data);
+
+/*
+ * Expire reflog entries for the specified reference. sha1 is the old
+ * value of the reference. flags is a combination of the constants in
+ * enum expire_reflog_flags. The three function pointers are described
+ * above. On success, return zero.
+ */
+extern 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);
+
#endif /* REFS_H */