1#ifndef REFS_H 2#define REFS_H 3 4struct ref_lock { 5char*ref_name; 6char*orig_ref_name; 7struct lock_file *lk; 8unsigned char old_sha1[20]; 9int lock_fd; 10int force_write; 11}; 12 13struct 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 */ 38typedefinteach_ref_fn(const char*refname, 39const 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 */ 50externinthead_ref(each_ref_fn,void*); 51externintfor_each_ref(each_ref_fn,void*); 52externintfor_each_ref_in(const char*, each_ref_fn,void*); 53externintfor_each_tag_ref(each_ref_fn,void*); 54externintfor_each_branch_ref(each_ref_fn,void*); 55externintfor_each_remote_ref(each_ref_fn,void*); 56externintfor_each_replace_ref(each_ref_fn,void*); 57externintfor_each_glob_ref(each_ref_fn,const char*pattern,void*); 58externintfor_each_glob_ref_in(each_ref_fn,const char*pattern,const char* prefix,void*); 59 60externinthead_ref_submodule(const char*submodule, each_ref_fn fn,void*cb_data); 61externintfor_each_ref_submodule(const char*submodule, each_ref_fn fn,void*cb_data); 62externintfor_each_ref_in_submodule(const char*submodule,const char*prefix, 63 each_ref_fn fn,void*cb_data); 64externintfor_each_tag_ref_submodule(const char*submodule, each_ref_fn fn,void*cb_data); 65externintfor_each_branch_ref_submodule(const char*submodule, each_ref_fn fn,void*cb_data); 66externintfor_each_remote_ref_submodule(const char*submodule, each_ref_fn fn,void*cb_data); 67 68externinthead_ref_namespaced(each_ref_fn fn,void*cb_data); 69externintfor_each_namespaced_ref(each_ref_fn fn,void*cb_data); 70 71staticinlineconst char*has_glob_specials(const char*pattern) 72{ 73returnstrpbrk(pattern,"?*["); 74} 75 76/* can be used to learn about broken ref and symref */ 77externintfor_each_rawref(each_ref_fn,void*); 78 79externvoidwarn_dangling_symref(FILE*fp,const char*msg_fmt,const char*refname); 80externvoidwarn_dangling_symrefs(FILE*fp,const char*msg_fmt,const struct string_list* refnames); 81 82/* 83 * Lock the packed-refs file for writing. Flags is passed to 84 * hold_lock_file_for_update(). Return 0 on success. 85 */ 86externintlock_packed_refs(int flags); 87 88/* 89 * Add a reference to the in-memory packed reference cache. This may 90 * only be called while the packed-refs file is locked (see 91 * lock_packed_refs()). To actually write the packed-refs file, call 92 * commit_packed_refs(). 93 */ 94externvoidadd_packed_ref(const char*refname,const unsigned char*sha1); 95 96/* 97 * Write the current version of the packed refs cache from memory to 98 * disk. The packed-refs file must already be locked for writing (see 99 * lock_packed_refs()). Return zero on success. 100 */ 101externintcommit_packed_refs(void); 102 103/* 104 * Rollback the lockfile for the packed-refs file, and discard the 105 * in-memory packed reference cache. (The packed-refs file will be 106 * read anew if it is needed again after this function is called.) 107 */ 108externvoidrollback_packed_refs(void); 109 110/* 111 * Flags for controlling behaviour of pack_refs() 112 * PACK_REFS_PRUNE: Prune loose refs after packing 113 * PACK_REFS_ALL: Pack _all_ refs, not just tags and already packed refs 114 */ 115#define PACK_REFS_PRUNE 0x0001 116#define PACK_REFS_ALL 0x0002 117 118/* 119 * Write a packed-refs file for the current repository. 120 * flags: Combination of the above PACK_REFS_* flags. 121 */ 122intpack_refs(unsigned int flags); 123 124externintrepack_without_refs(const char**refnames,int n); 125 126externintref_exists(const char*); 127 128/* 129 * If refname is a non-symbolic reference that refers to a tag object, 130 * and the tag can be (recursively) dereferenced to a non-tag object, 131 * store the SHA1 of the referred-to object to sha1 and return 0. If 132 * any of these conditions are not met, return a non-zero value. 133 * Symbolic references are considered unpeelable, even if they 134 * ultimately resolve to a peelable tag. 135 */ 136externintpeel_ref(const char*refname,unsigned char*sha1); 137 138/** Locks a "refs/" ref returning the lock on success and NULL on failure. **/ 139externstruct ref_lock *lock_ref_sha1(const char*refname,const unsigned char*old_sha1); 140 141/** Locks any ref (for 'HEAD' type refs). */ 142#define REF_NODEREF 0x01 143externstruct ref_lock *lock_any_ref_for_update(const char*refname, 144const unsigned char*old_sha1, 145int flags,int*type_p); 146 147/** Close the file descriptor owned by a lock and return the status */ 148externintclose_ref(struct ref_lock *lock); 149 150/** Close and commit the ref locked by the lock */ 151externintcommit_ref(struct ref_lock *lock); 152 153/** Release any lock taken but not written. **/ 154externvoidunlock_ref(struct ref_lock *lock); 155 156/** Writes sha1 into the ref specified by the lock. **/ 157externintwrite_ref_sha1(struct ref_lock *lock,const unsigned char*sha1,const char*msg); 158 159/** Setup reflog before using. **/ 160intlog_ref_setup(const char*refname,char*logfile,int bufsize); 161 162/** Reads log for the value of ref during at_time. **/ 163externintread_ref_at(const char*refname,unsigned long at_time,int cnt, 164unsigned char*sha1,char**msg, 165unsigned long*cutoff_time,int*cutoff_tz,int*cutoff_cnt); 166 167/** Check if a particular reflog exists */ 168externintreflog_exists(const char*refname); 169 170/** Delete a reflog */ 171externintdelete_reflog(const char*refname); 172 173/* iterate over reflog entries */ 174typedefinteach_reflog_ent_fn(unsigned char*osha1,unsigned char*nsha1,const char*,unsigned long,int,const char*,void*); 175intfor_each_reflog_ent(const char*refname, each_reflog_ent_fn fn,void*cb_data); 176intfor_each_reflog_ent_reverse(const char*refname, each_reflog_ent_fn fn,void*cb_data); 177 178/* 179 * Calls the specified function for each reflog file until it returns nonzero, 180 * and returns the value 181 */ 182externintfor_each_reflog(each_ref_fn,void*); 183 184#define REFNAME_ALLOW_ONELEVEL 1 185#define REFNAME_REFSPEC_PATTERN 2 186#define REFNAME_DOT_COMPONENT 4 187 188/* 189 * Return 0 iff refname has the correct format for a refname according 190 * to the rules described in Documentation/git-check-ref-format.txt. 191 * If REFNAME_ALLOW_ONELEVEL is set in flags, then accept one-level 192 * reference names. If REFNAME_REFSPEC_PATTERN is set in flags, then 193 * allow a "*" wildcard character in place of one of the name 194 * components. No leading or repeated slashes are accepted. If 195 * REFNAME_DOT_COMPONENT is set in flags, then allow refname 196 * components to start with "." (but not a whole component equal to 197 * "." or ".."). 198 */ 199externintcheck_refname_format(const char*refname,int flags); 200 201externconst char*prettify_refname(const char*refname); 202externchar*shorten_unambiguous_ref(const char*refname,int strict); 203 204/** rename ref, return 0 on success **/ 205externintrename_ref(const char*oldref,const char*newref,const char*logmsg); 206 207/** 208 * Resolve refname in the nested "gitlink" repository that is located 209 * at path. If the resolution is successful, return 0 and set sha1 to 210 * the name of the object; otherwise, return a non-zero value. 211 */ 212externintresolve_gitlink_ref(const char*path,const char*refname,unsigned char*sha1); 213 214enum action_on_err { 215 UPDATE_REFS_MSG_ON_ERR, 216 UPDATE_REFS_DIE_ON_ERR, 217 UPDATE_REFS_QUIET_ON_ERR 218}; 219 220/* 221 * Begin a reference transaction. The reference transaction must 222 * eventually be commited using ref_transaction_commit() or rolled 223 * back using ref_transaction_rollback(). 224 */ 225struct ref_transaction *ref_transaction_begin(void); 226 227/* 228 * Roll back a ref_transaction and free all associated data. 229 */ 230voidref_transaction_rollback(struct ref_transaction *transaction); 231 232 233/* 234 * The following functions add a reference check or update to a 235 * ref_transaction. In all of them, refname is the name of the 236 * reference to be affected. The functions make internal copies of 237 * refname, so the caller retains ownership of the parameter. flags 238 * can be REF_NODEREF; it is passed to update_ref_lock(). 239 */ 240 241 242/* 243 * Add a reference update to transaction. new_sha1 is the value that 244 * the reference should have after the update, or zeros if it should 245 * be deleted. If have_old is true, then old_sha1 holds the value 246 * that the reference should have had before the update, or zeros if 247 * it must not have existed beforehand. 248 */ 249voidref_transaction_update(struct ref_transaction *transaction, 250const char*refname, 251unsigned char*new_sha1,unsigned char*old_sha1, 252int flags,int have_old); 253 254/* 255 * Add a reference creation to transaction. new_sha1 is the value 256 * that the reference should have after the update; it must not be the 257 * null SHA-1. It is verified that the reference does not exist 258 * already. 259 */ 260voidref_transaction_create(struct ref_transaction *transaction, 261const char*refname, 262unsigned char*new_sha1, 263int flags); 264 265/* 266 * Add a reference deletion to transaction. If have_old is true, then 267 * old_sha1 holds the value that the reference should have had before 268 * the update (which must not be the null SHA-1). 269 */ 270voidref_transaction_delete(struct ref_transaction *transaction, 271const char*refname, 272unsigned char*old_sha1, 273int flags,int have_old); 274 275/* 276 * Commit all of the changes that have been queued in transaction, as 277 * atomically as possible. Return a nonzero value if there is a 278 * problem. The ref_transaction is freed by this function. 279 */ 280intref_transaction_commit(struct ref_transaction *transaction, 281const char*msg,enum action_on_err onerr); 282 283/** Lock a ref and then write its file */ 284intupdate_ref(const char*action,const char*refname, 285const unsigned char*sha1,const unsigned char*oldval, 286int flags,enum action_on_err onerr); 287 288externintparse_hide_refs_config(const char*var,const char*value,const char*); 289externintref_is_hidden(const char*); 290 291#endif/* REFS_H */