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432ad41e60
Store references hierarchically in a tree that matches the pseudo-directory structure of the reference names. Add a new kind of ref_entry (with flag REF_DIR) to represent a whole subdirectory of references. Sort ref_dirs one subdirectory at a time. NOTE: the dirs can now be sorted as a side-effect of other function calls. Therefore, it would be problematic to do something from a each_ref_fn callback that could provoke the sorting of a directory that is currently being iterated over (i.e., the directory containing the entry that is being processed or any of its parents). This is a bit far-fetched, because a directory is always sorted just before being iterated over. Therefore, read-only accesses cannot trigger the sorting of a directory whose iteration has already started. But if a callback function would add a reference to a parent directory of the reference in the iteration, then try to resolve a reference under that directory, a re-sort could be triggered and cause the iteration to work incorrectly. Nevertheless...add a comment in refs.h warning against modifications during iteration. Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu> Signed-off-by: Junio C Hamano <gitster@pobox.com>
150 lines
6 KiB
C
150 lines
6 KiB
C
#ifndef REFS_H
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#define REFS_H
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struct ref_lock {
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char *ref_name;
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char *orig_ref_name;
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struct lock_file *lk;
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unsigned char old_sha1[20];
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int lock_fd;
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int force_write;
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};
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#define REF_ISSYMREF 0x01
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#define REF_ISPACKED 0x02
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#define REF_ISBROKEN 0x04
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/*
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* Calls the specified function for each ref file until it returns
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* nonzero, and returns the value. Please note that it is not safe to
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* modify references while an iteration is in progress, unless the
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* same callback function invocation that modifies the reference also
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* returns a nonzero value to immediately stop the iteration.
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*/
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typedef int each_ref_fn(const char *refname, const unsigned char *sha1, int flags, void *cb_data);
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extern int head_ref(each_ref_fn, void *);
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extern int for_each_ref(each_ref_fn, void *);
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extern int for_each_ref_in(const char *, each_ref_fn, void *);
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extern int for_each_tag_ref(each_ref_fn, void *);
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extern int for_each_branch_ref(each_ref_fn, void *);
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extern int for_each_remote_ref(each_ref_fn, void *);
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extern int for_each_replace_ref(each_ref_fn, void *);
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extern int for_each_glob_ref(each_ref_fn, const char *pattern, void *);
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extern int for_each_glob_ref_in(each_ref_fn, const char *pattern, const char* prefix, void *);
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extern int head_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data);
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extern int for_each_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data);
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extern int for_each_ref_in_submodule(const char *submodule, const char *prefix,
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each_ref_fn fn, void *cb_data);
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extern int for_each_tag_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data);
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extern int for_each_branch_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data);
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extern int for_each_remote_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data);
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extern int head_ref_namespaced(each_ref_fn fn, void *cb_data);
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extern int for_each_namespaced_ref(each_ref_fn fn, void *cb_data);
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static inline const char *has_glob_specials(const char *pattern)
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{
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return strpbrk(pattern, "?*[");
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}
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/* can be used to learn about broken ref and symref */
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extern int for_each_rawref(each_ref_fn, void *);
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extern void warn_dangling_symref(FILE *fp, const char *msg_fmt, const char *refname);
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/*
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* Add a reference to the in-memory packed reference cache. To actually
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* write the reference to the packed-refs file, call pack_refs().
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*/
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extern void add_packed_ref(const char *refname, const unsigned char *sha1);
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extern int ref_exists(const char *);
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extern int peel_ref(const char *refname, unsigned char *sha1);
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/** Locks a "refs/" ref returning the lock on success and NULL on failure. **/
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extern struct ref_lock *lock_ref_sha1(const char *refname, const unsigned char *old_sha1);
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/** Locks any ref (for 'HEAD' type refs). */
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#define REF_NODEREF 0x01
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extern struct ref_lock *lock_any_ref_for_update(const char *refname,
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const unsigned char *old_sha1,
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int flags);
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/** Close the file descriptor owned by a lock and return the status */
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extern int close_ref(struct ref_lock *lock);
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/** Close and commit the ref locked by the lock */
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extern int commit_ref(struct ref_lock *lock);
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/** Release any lock taken but not written. **/
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extern void unlock_ref(struct ref_lock *lock);
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/** Writes sha1 into the ref specified by the lock. **/
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extern int write_ref_sha1(struct ref_lock *lock, const unsigned char *sha1, const char *msg);
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/*
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* Invalidate the reference cache for the specified submodule. Use
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* submodule=NULL to invalidate the cache for the main module. This
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* function must be called if references are changed via a mechanism
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* other than the refs API.
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*/
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extern void invalidate_ref_cache(const char *submodule);
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/** Setup reflog before using. **/
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int log_ref_setup(const char *ref_name, char *logfile, int bufsize);
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/** Reads log for the value of ref during at_time. **/
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extern int read_ref_at(const char *refname, unsigned long at_time, int cnt,
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unsigned char *sha1, char **msg,
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unsigned long *cutoff_time, int *cutoff_tz, int *cutoff_cnt);
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/* iterate over reflog entries */
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typedef int each_reflog_ent_fn(unsigned char *osha1, unsigned char *nsha1, const char *, unsigned long, int, const char *, void *);
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int for_each_reflog_ent(const char *refname, each_reflog_ent_fn fn, void *cb_data);
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int for_each_recent_reflog_ent(const char *refname, each_reflog_ent_fn fn, long, void *cb_data);
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/*
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* Calls the specified function for each reflog file until it returns nonzero,
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* and returns the value
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*/
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extern int for_each_reflog(each_ref_fn, void *);
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#define REFNAME_ALLOW_ONELEVEL 1
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#define REFNAME_REFSPEC_PATTERN 2
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#define REFNAME_DOT_COMPONENT 4
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/*
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* Return 0 iff refname has the correct format for a refname according
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* to the rules described in Documentation/git-check-ref-format.txt.
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* If REFNAME_ALLOW_ONELEVEL is set in flags, then accept one-level
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* reference names. If REFNAME_REFSPEC_PATTERN is set in flags, then
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* allow a "*" wildcard character in place of one of the name
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* components. No leading or repeated slashes are accepted. If
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* REFNAME_DOT_COMPONENT is set in flags, then allow refname
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* components to start with "." (but not a whole component equal to
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* "." or "..").
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*/
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extern int check_refname_format(const char *refname, int flags);
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extern const char *prettify_refname(const char *refname);
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extern char *shorten_unambiguous_ref(const char *refname, int strict);
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/** rename ref, return 0 on success **/
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extern int rename_ref(const char *oldref, const char *newref, const char *logmsg);
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/**
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* Resolve refname in the nested "gitlink" repository that is located
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* at path. If the resolution is successful, return 0 and set sha1 to
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* the name of the object; otherwise, return a non-zero value.
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*/
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extern int resolve_gitlink_ref(const char *path, const char *refname, unsigned char *sha1);
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/** lock a ref and then write its file */
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enum action_on_err { MSG_ON_ERR, DIE_ON_ERR, QUIET_ON_ERR };
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int update_ref(const char *action, const char *refname,
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const unsigned char *sha1, const unsigned char *oldval,
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int flags, enum action_on_err onerr);
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#endif /* REFS_H */
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