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The lifetime of the memory pointed to by the refname and sha1 arguments to each_ref_fn was never documented, but some callers used to assume that it was essentially permanent. In fact the API does *not* guarantee that these objects live beyond a single callback invocation. In the current code, the lifetimes are bound together with the lifetimes of the ref_caches. Since these are usually long, the callers usually got away with their sloppiness. But even today, if a ref_cache is invalidated the memory can be freed. And planned changes to reference caching, needed to eliminate race conditions, will probably need to shorten the lifetimes of these objects. The commits leading up to this have (hopefully) fixed all of the callers of the for_each_ref()-like functions. This commit does the last step: documents what each_ref_fn callbacks can assume about object lifetimes. Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu> Signed-off-by: Junio C Hamano <gitster@pobox.com>
164 lines
6.4 KiB
C
164 lines
6.4 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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* The signature for the callback function for the for_each_*()
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* functions below. The memory pointed to by the refname and sha1
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* arguments is only guaranteed to be valid for the duration of a
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* single callback invocation.
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*/
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typedef int each_ref_fn(const char *refname,
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const unsigned char *sha1, int flags, void *cb_data);
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/*
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* The following functions invoke the specified callback function for
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* each reference indicated. If the function ever returns a nonzero
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* value, stop the iteration and return that value. Please note that
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* it is not safe to modify references while an iteration is in
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* progress, unless the same callback function invocation that
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* modifies the reference also returns a nonzero value to immediately
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* stop the iteration.
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*/
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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_reflog_ent_reverse(const char *refname, each_reflog_ent_fn fn, 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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extern int parse_hide_refs_config(const char *var, const char *value, const char *);
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extern int ref_is_hidden(const char *);
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#endif /* REFS_H */
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