refs.h

   1 #ifndef REFS_H
   2 #define REFS_H
   3
   4 struct 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 struct ref_transaction;
  14
  15 /*
  16  * Bit values set in the flags argument passed to each_ref_fn():
  17  */
  18
  19 /* Reference is a symbolic reference. */
  20 #define REF_ISSYMREF 0x01
  21
  22 /* Reference is a packed reference. */
  23 #define REF_ISPACKED 0x02
  24
  25 /*
  26  * Reference cannot be resolved to an object name: dangling symbolic
  27  * reference (directly or indirectly), corrupt reference file, or
  28  * symbolic reference refers to ill-formatted reference name.
  29  */
  30 #define REF_ISBROKEN 0x04
  31
  32 /*
  33  * The signature for the callback function for the for_each_*()
  34  * functions below.  The memory pointed to by the refname and sha1
  35  * arguments is only guaranteed to be valid for the duration of a
  36  * single callback invocation.
  37  */
  38 typedef int each_ref_fn(const char *refname,
  39                         const unsigned char *sha1, int flags, void *cb_data);
  40
  41 /*
  42  * The following functions invoke the specified callback function for
  43  * each reference indicated.  If the function ever returns a nonzero
  44  * value, stop the iteration and return that value.  Please note that
  45  * it is not safe to modify references while an iteration is in
  46  * progress, unless the same callback function invocation that
  47  * modifies the reference also returns a nonzero value to immediately
  48  * stop the iteration.
  49  */
  50 extern int head_ref(each_ref_fn, void *);
  51 extern int for_each_ref(each_ref_fn, void *);
  52 extern int for_each_ref_in(const char *, each_ref_fn, void *);
  53 extern int for_each_tag_ref(each_ref_fn, void *);
  54 extern int for_each_branch_ref(each_ref_fn, void *);
  55 extern int for_each_remote_ref(each_ref_fn, void *);
  56 extern int for_each_replace_ref(each_ref_fn, void *);
  57 extern int for_each_glob_ref(each_ref_fn, const char *pattern, void *);
  58 extern int for_each_glob_ref_in(each_ref_fn, const char *pattern, const char* prefix, void *);
  59
  60 extern int head_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data);
  61 extern int for_each_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data);
  62 extern int for_each_ref_in_submodule(const char *submodule, const char *prefix,
  63                 each_ref_fn fn, void *cb_data);
  64 extern int for_each_tag_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data);
  65 extern int for_each_branch_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data);
  66 extern int for_each_remote_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data);
  67
  68 extern int head_ref_namespaced(each_ref_fn fn, void *cb_data);
  69 extern int for_each_namespaced_ref(each_ref_fn fn, void *cb_data);
  70
  71 static inline const char *has_glob_specials(const char *pattern)
  72 {
  73         return strpbrk(pattern, "?*[");
  74 }
  75
  76 /* can be used to learn about broken ref and symref */
  77 extern int for_each_rawref(each_ref_fn, void *);
  78
  79 extern void warn_dangling_symref(FILE *fp, const char *msg_fmt, const char *refname);
  80
  81 /*
  82  * Lock the packed-refs file for writing.  Flags is passed to
  83  * hold_lock_file_for_update().  Return 0 on success.
  84  */
  85 extern int lock_packed_refs(int flags);
  86
  87 /*
  88  * Add a reference to the in-memory packed reference cache.  This may
  89  * only be called while the packed-refs file is locked (see
  90  * lock_packed_refs()).  To actually write the packed-refs file, call
  91  * commit_packed_refs().
  92  */
  93 extern void add_packed_ref(const char *refname, const unsigned char *sha1);
  94
  95 /*
  96  * Write the current version of the packed refs cache from memory to
  97  * disk.  The packed-refs file must already be locked for writing (see
  98  * lock_packed_refs()).  Return zero on success.
  99  */
 100 extern int commit_packed_refs(void);
 101
 102 /*
 103  * Rollback the lockfile for the packed-refs file, and discard the
 104  * in-memory packed reference cache.  (The packed-refs file will be
 105  * read anew if it is needed again after this function is called.)
 106  */
 107 extern void rollback_packed_refs(void);
 108
 109 /*
 110  * Flags for controlling behaviour of pack_refs()
 111  * PACK_REFS_PRUNE: Prune loose refs after packing
 112  * PACK_REFS_ALL:   Pack _all_ refs, not just tags and already packed refs
 113  */
 114 #define PACK_REFS_PRUNE 0x0001
 115 #define PACK_REFS_ALL   0x0002
 116
 117 /*
 118  * Write a packed-refs file for the current repository.
 119  * flags: Combination of the above PACK_REFS_* flags.
 120  */
 121 int pack_refs(unsigned int flags);
 122
 123 extern int ref_exists(const char *);
 124
 125 /*
 126  * If refname is a non-symbolic reference that refers to a tag object,
 127  * and the tag can be (recursively) dereferenced to a non-tag object,
 128  * store the SHA1 of the referred-to object to sha1 and return 0.  If
 129  * any of these conditions are not met, return a non-zero value.
 130  * Symbolic references are considered unpeelable, even if they
 131  * ultimately resolve to a peelable tag.
 132  */
 133 extern int peel_ref(const char *refname, unsigned char *sha1);
 134
 135 /** Locks a "refs/" ref returning the lock on success and NULL on failure. **/
 136 extern struct ref_lock *lock_ref_sha1(const char *refname, const unsigned char *old_sha1);
 137
 138 /** Locks any ref (for 'HEAD' type refs). */
 139 #define REF_NODEREF     0x01
 140 extern struct ref_lock *lock_any_ref_for_update(const char *refname,
 141                                                 const unsigned char *old_sha1,
 142                                                 int flags, int *type_p);
 143
 144 /** Close the file descriptor owned by a lock and return the status */
 145 extern int close_ref(struct ref_lock *lock);
 146
 147 /** Close and commit the ref locked by the lock */
 148 extern int commit_ref(struct ref_lock *lock);
 149
 150 /** Release any lock taken but not written. **/
 151 extern void unlock_ref(struct ref_lock *lock);
 152
 153 /** Writes sha1 into the ref specified by the lock. **/
 154 extern int write_ref_sha1(struct ref_lock *lock, const unsigned char *sha1, const char *msg);
 155
 156 /** Setup reflog before using. **/
 157 int log_ref_setup(const char *refname, char *logfile, int bufsize);
 158
 159 /** Reads log for the value of ref during at_time. **/
 160 extern int read_ref_at(const char *refname, unsigned long at_time, int cnt,
 161                        unsigned char *sha1, char **msg,
 162                        unsigned long *cutoff_time, int *cutoff_tz, int *cutoff_cnt);
 163
 164 /* iterate over reflog entries */
 165 typedef int each_reflog_ent_fn(unsigned char *osha1, unsigned char *nsha1, const char *, unsigned long, int, const char *, void *);
 166 int for_each_reflog_ent(const char *refname, each_reflog_ent_fn fn, void *cb_data);
 167 int for_each_reflog_ent_reverse(const char *refname, each_reflog_ent_fn fn, void *cb_data);
 168
 169 /*
 170  * Calls the specified function for each reflog file until it returns nonzero,
 171  * and returns the value
 172  */
 173 extern int for_each_reflog(each_ref_fn, void *);
 174
 175 #define REFNAME_ALLOW_ONELEVEL 1
 176 #define REFNAME_REFSPEC_PATTERN 2
 177 #define REFNAME_DOT_COMPONENT 4
 178
 179 /*
 180  * Return 0 iff refname has the correct format for a refname according
 181  * to the rules described in Documentation/git-check-ref-format.txt.
 182  * If REFNAME_ALLOW_ONELEVEL is set in flags, then accept one-level
 183  * reference names.  If REFNAME_REFSPEC_PATTERN is set in flags, then
 184  * allow a "*" wildcard character in place of one of the name
 185  * components.  No leading or repeated slashes are accepted.  If
 186  * REFNAME_DOT_COMPONENT is set in flags, then allow refname
 187  * components to start with "." (but not a whole component equal to
 188  * "." or "..").
 189  */
 190 extern int check_refname_format(const char *refname, int flags);
 191
 192 extern const char *prettify_refname(const char *refname);
 193 extern char *shorten_unambiguous_ref(const char *refname, int strict);
 194
 195 /** rename ref, return 0 on success **/
 196 extern int rename_ref(const char *oldref, const char *newref, const char *logmsg);
 197
 198 /**
 199  * Resolve refname in the nested "gitlink" repository that is located
 200  * at path.  If the resolution is successful, return 0 and set sha1 to
 201  * the name of the object; otherwise, return a non-zero value.
 202  */
 203 extern int resolve_gitlink_ref(const char *path, const char *refname, unsigned char *sha1);
 204
 205 enum action_on_err {
 206         UPDATE_REFS_MSG_ON_ERR,
 207         UPDATE_REFS_DIE_ON_ERR,
 208         UPDATE_REFS_QUIET_ON_ERR
 209 };
 210
 211 /*
 212  * Begin a reference transaction.  The reference transaction must
 213  * eventually be commited using ref_transaction_commit() or rolled
 214  * back using ref_transaction_rollback().
 215  */
 216 struct ref_transaction *ref_transaction_begin(void);
 217
 218 /*
 219  * Roll back a ref_transaction and free all associated data.
 220  */
 221 void ref_transaction_rollback(struct ref_transaction *transaction);
 222
 223
 224 /*
 225  * The following functions add a reference check or update to a
 226  * ref_transaction.  In all of them, refname is the name of the
 227  * reference to be affected.  The functions make internal copies of
 228  * refname, so the caller retains ownership of the parameter.  flags
 229  * can be REF_NODEREF; it is passed to update_ref_lock().
 230  */
 231
 232
 233 /*
 234  * Add a reference update to transaction.  new_sha1 is the value that
 235  * the reference should have after the update, or zeros if it should
 236  * be deleted.  If have_old is true, then old_sha1 holds the value
 237  * that the reference should have had before the update, or zeros if
 238  * it must not have existed beforehand.
 239  */
 240 void ref_transaction_update(struct ref_transaction *transaction,
 241                             const char *refname,
 242                             unsigned char *new_sha1, unsigned char *old_sha1,
 243                             int flags, int have_old);
 244
 245 /*
 246  * Add a reference creation to transaction.  new_sha1 is the value
 247  * that the reference should have after the update; it must not be the
 248  * null SHA-1.  It is verified that the reference does not exist
 249  * already.
 250  */
 251 void ref_transaction_create(struct ref_transaction *transaction,
 252                             const char *refname,
 253                             unsigned char *new_sha1,
 254                             int flags);
 255
 256 /*
 257  * Add a reference deletion to transaction.  If have_old is true, then
 258  * old_sha1 holds the value that the reference should have had before
 259  * the update (which must not be the null SHA-1).
 260  */
 261 void ref_transaction_delete(struct ref_transaction *transaction,
 262                             const char *refname,
 263                             unsigned char *old_sha1,
 264                             int flags, int have_old);
 265
 266 /*
 267  * Commit all of the changes that have been queued in transaction, as
 268  * atomically as possible.  Return a nonzero value if there is a
 269  * problem.  The ref_transaction is freed by this function.
 270  */
 271 int ref_transaction_commit(struct ref_transaction *transaction,
 272                            const char *msg, enum action_on_err onerr);
 273
 274 /** Lock a ref and then write its file */
 275 int update_ref(const char *action, const char *refname,
 276                 const unsigned char *sha1, const unsigned char *oldval,
 277                 int flags, enum action_on_err onerr);
 278
 279 extern int parse_hide_refs_config(const char *var, const char *value, const char *);
 280 extern int ref_is_hidden(const char *);
 281
 282 #endif /* REFS_H */