Andrew's git / gitweb.git / refs.h
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refs.hon commit peel_ref(): fix return value for non-peelable, not-current reference (2312a79)
   1#ifndef REFS_H
   2#define REFS_H
   3
   4struct ref_lock {
   5        char *ref_name;
   6        char *orig_ref_name;
   7        struct lock_file *lk;
   8        unsigned char old_sha1[20];
   9        int lock_fd;
  10        int force_write;
  11};
  12
  13/*
  14 * Bit values set in the flags argument passed to each_ref_fn():
  15 */
  16
  17/* Reference is a symbolic reference. */
  18#define REF_ISSYMREF 0x01
  19
  20/* Reference is a packed reference. */
  21#define REF_ISPACKED 0x02
  22
  23/*
  24 * Reference cannot be resolved to an object name: dangling symbolic
  25 * reference (directly or indirectly), corrupt reference file, or
  26 * symbolic reference refers to ill-formatted reference name.
  27 */
  28#define REF_ISBROKEN 0x04
  29
  30/*
  31 * Calls the specified function for each ref file until it returns
  32 * nonzero, and returns the value.  Please note that it is not safe to
  33 * modify references while an iteration is in progress, unless the
  34 * same callback function invocation that modifies the reference also
  35 * returns a nonzero value to immediately stop the iteration.
  36 */
  37typedef int each_ref_fn(const char *refname, const unsigned char *sha1, int flags, void *cb_data);
  38extern int head_ref(each_ref_fn, void *);
  39extern int for_each_ref(each_ref_fn, void *);
  40extern int for_each_ref_in(const char *, each_ref_fn, void *);
  41extern int for_each_tag_ref(each_ref_fn, void *);
  42extern int for_each_branch_ref(each_ref_fn, void *);
  43extern int for_each_remote_ref(each_ref_fn, void *);
  44extern int for_each_replace_ref(each_ref_fn, void *);
  45extern int for_each_glob_ref(each_ref_fn, const char *pattern, void *);
  46extern int for_each_glob_ref_in(each_ref_fn, const char *pattern, const char* prefix, void *);
  47
  48extern int head_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data);
  49extern int for_each_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data);
  50extern int for_each_ref_in_submodule(const char *submodule, const char *prefix,
  51                each_ref_fn fn, void *cb_data);
  52extern int for_each_tag_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data);
  53extern int for_each_branch_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data);
  54extern int for_each_remote_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data);
  55
  56extern int head_ref_namespaced(each_ref_fn fn, void *cb_data);
  57extern int for_each_namespaced_ref(each_ref_fn fn, void *cb_data);
  58
  59static inline const char *has_glob_specials(const char *pattern)
  60{
  61        return strpbrk(pattern, "?*[");
  62}
  63
  64/* can be used to learn about broken ref and symref */
  65extern int for_each_rawref(each_ref_fn, void *);
  66
  67extern void warn_dangling_symref(FILE *fp, const char *msg_fmt, const char *refname);
  68
  69/*
  70 * Add a reference to the in-memory packed reference cache.  To actually
  71 * write the reference to the packed-refs file, call pack_refs().
  72 */
  73extern void add_packed_ref(const char *refname, const unsigned char *sha1);
  74
  75extern int ref_exists(const char *);
  76
  77/*
  78 * If refname is a non-symbolic reference that refers to a tag object,
  79 * and the tag can be (recursively) dereferenced to a non-tag object,
  80 * store the SHA1 of the referred-to object to sha1 and return 0.  If
  81 * any of these conditions are not met, return a non-zero value.
  82 * Symbolic references are considered unpeelable, even if they
  83 * ultimately resolve to a peelable tag.
  84 */
  85extern int peel_ref(const char *refname, unsigned char *sha1);
  86
  87/** Locks a "refs/" ref returning the lock on success and NULL on failure. **/
  88extern struct ref_lock *lock_ref_sha1(const char *refname, const unsigned char *old_sha1);
  89
  90/** Locks any ref (for 'HEAD' type refs). */
  91#define REF_NODEREF     0x01
  92extern struct ref_lock *lock_any_ref_for_update(const char *refname,
  93                                                const unsigned char *old_sha1,
  94                                                int flags);
  95
  96/** Close the file descriptor owned by a lock and return the status */
  97extern int close_ref(struct ref_lock *lock);
  98
  99/** Close and commit the ref locked by the lock */
 100extern int commit_ref(struct ref_lock *lock);
 101
 102/** Release any lock taken but not written. **/
 103extern void unlock_ref(struct ref_lock *lock);
 104
 105/** Writes sha1 into the ref specified by the lock. **/
 106extern int write_ref_sha1(struct ref_lock *lock, const unsigned char *sha1, const char *msg);
 107
 108/*
 109 * Invalidate the reference cache for the specified submodule.  Use
 110 * submodule=NULL to invalidate the cache for the main module.  This
 111 * function must be called if references are changed via a mechanism
 112 * other than the refs API.
 113 */
 114extern void invalidate_ref_cache(const char *submodule);
 115
 116/** Setup reflog before using. **/
 117int log_ref_setup(const char *ref_name, char *logfile, int bufsize);
 118
 119/** Reads log for the value of ref during at_time. **/
 120extern int read_ref_at(const char *refname, unsigned long at_time, int cnt,
 121                       unsigned char *sha1, char **msg,
 122                       unsigned long *cutoff_time, int *cutoff_tz, int *cutoff_cnt);
 123
 124/* iterate over reflog entries */
 125typedef int each_reflog_ent_fn(unsigned char *osha1, unsigned char *nsha1, const char *, unsigned long, int, const char *, void *);
 126int for_each_reflog_ent(const char *refname, each_reflog_ent_fn fn, void *cb_data);
 127int for_each_recent_reflog_ent(const char *refname, each_reflog_ent_fn fn, long, void *cb_data);
 128
 129/*
 130 * Calls the specified function for each reflog file until it returns nonzero,
 131 * and returns the value
 132 */
 133extern int for_each_reflog(each_ref_fn, void *);
 134
 135#define REFNAME_ALLOW_ONELEVEL 1
 136#define REFNAME_REFSPEC_PATTERN 2
 137#define REFNAME_DOT_COMPONENT 4
 138
 139/*
 140 * Return 0 iff refname has the correct format for a refname according
 141 * to the rules described in Documentation/git-check-ref-format.txt.
 142 * If REFNAME_ALLOW_ONELEVEL is set in flags, then accept one-level
 143 * reference names.  If REFNAME_REFSPEC_PATTERN is set in flags, then
 144 * allow a "*" wildcard character in place of one of the name
 145 * components.  No leading or repeated slashes are accepted.  If
 146 * REFNAME_DOT_COMPONENT is set in flags, then allow refname
 147 * components to start with "." (but not a whole component equal to
 148 * "." or "..").
 149 */
 150extern int check_refname_format(const char *refname, int flags);
 151
 152extern const char *prettify_refname(const char *refname);
 153extern char *shorten_unambiguous_ref(const char *refname, int strict);
 154
 155/** rename ref, return 0 on success **/
 156extern int rename_ref(const char *oldref, const char *newref, const char *logmsg);
 157
 158/**
 159 * Resolve refname in the nested "gitlink" repository that is located
 160 * at path.  If the resolution is successful, return 0 and set sha1 to
 161 * the name of the object; otherwise, return a non-zero value.
 162 */
 163extern int resolve_gitlink_ref(const char *path, const char *refname, unsigned char *sha1);
 164
 165/** lock a ref and then write its file */
 166enum action_on_err { MSG_ON_ERR, DIE_ON_ERR, QUIET_ON_ERR };
 167int update_ref(const char *action, const char *refname,
 168                const unsigned char *sha1, const unsigned char *oldval,
 169                int flags, enum action_on_err onerr);
 170
 171#endif /* REFS_H */