diff options
Diffstat (limited to 'refs.h')
| -rw-r--r-- | refs.h | 315 |
1 files changed, 281 insertions, 34 deletions
@@ -10,14 +10,83 @@ struct ref_lock { int force_write; }; -#define REF_ISSYMREF 01 -#define REF_ISPACKED 02 +/* + * A ref_transaction represents a collection of ref updates + * that should succeed or fail together. + * + * Calling sequence + * ---------------- + * - Allocate and initialize a `struct ref_transaction` by calling + * `ref_transaction_begin()`. + * + * - List intended ref updates by calling functions like + * `ref_transaction_update()` and `ref_transaction_create()`. + * + * - Call `ref_transaction_commit()` to execute the transaction. + * If this succeeds, the ref updates will have taken place and + * the transaction cannot be rolled back. + * + * - At any time call `ref_transaction_free()` to discard the + * transaction and free associated resources. In particular, + * this rolls back the transaction if it has not been + * successfully committed. + * + * Error handling + * -------------- + * + * On error, transaction functions append a message about what + * went wrong to the 'err' argument. The message mentions what + * ref was being updated (if any) when the error occurred so it + * can be passed to 'die' or 'error' as-is. + * + * The message is appended to err without first clearing err. + * err will not be '\n' terminated. + */ +struct ref_transaction; /* - * Calls the specified function for each ref file until it returns nonzero, - * and returns the value + * Bit values set in the flags argument passed to each_ref_fn(): + */ + +/* Reference is a symbolic reference. */ +#define REF_ISSYMREF 0x01 + +/* Reference is a packed reference. */ +#define REF_ISPACKED 0x02 + +/* + * Reference cannot be resolved to an object name: dangling symbolic + * reference (directly or indirectly), corrupt reference file, + * reference exists but name is bad, or symbolic reference refers to + * ill-formatted reference name. + */ +#define REF_ISBROKEN 0x04 + +/* + * Reference name is not well formed. + * + * See git-check-ref-format(1) for the definition of well formed ref names. + */ +#define REF_BAD_NAME 0x08 + +/* + * The signature for the callback function for the for_each_*() + * functions below. The memory pointed to by the refname and sha1 + * arguments is only guaranteed to be valid for the duration of a + * single callback invocation. + */ +typedef int each_ref_fn(const char *refname, + const unsigned char *sha1, int flags, void *cb_data); + +/* + * The following functions invoke the specified callback function for + * each reference indicated. If the function ever returns a nonzero + * value, stop the iteration and return that value. Please note that + * it is not safe to modify references while an iteration is in + * progress, unless the same callback function invocation that + * modifies the reference also returns a nonzero value to immediately + * stop the iteration. */ -typedef int each_ref_fn(const char *refname, const unsigned char *sha1, int flags, void *cb_data); extern int head_ref(each_ref_fn, void *); extern int for_each_ref(each_ref_fn, void *); extern int for_each_ref_in(const char *, each_ref_fn, void *); @@ -36,6 +105,9 @@ extern int for_each_tag_ref_submodule(const char *submodule, each_ref_fn fn, voi extern int for_each_branch_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data); extern int for_each_remote_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data); +extern int head_ref_namespaced(each_ref_fn fn, void *cb_data); +extern int for_each_namespaced_ref(each_ref_fn fn, void *cb_data); + static inline const char *has_glob_specials(const char *pattern) { return strpbrk(pattern, "?*["); @@ -45,24 +117,94 @@ static inline const char *has_glob_specials(const char *pattern) extern int for_each_rawref(each_ref_fn, void *); extern void warn_dangling_symref(FILE *fp, const char *msg_fmt, const char *refname); +extern void warn_dangling_symrefs(FILE *fp, const char *msg_fmt, const struct string_list *refnames); + +/* + * Lock the packed-refs file for writing. Flags is passed to + * hold_lock_file_for_update(). Return 0 on success. + * Errno is set to something meaningful on error. + */ +extern int lock_packed_refs(int flags); + +/* + * Add a reference to the in-memory packed reference cache. This may + * only be called while the packed-refs file is locked (see + * lock_packed_refs()). To actually write the packed-refs file, call + * commit_packed_refs(). + */ +extern void add_packed_ref(const char *refname, const unsigned char *sha1); /* - * Extra refs will be listed by for_each_ref() before any actual refs - * for the duration of this process or until clear_extra_refs() is - * called. Only extra refs added before for_each_ref() is called will - * be listed on a given call of for_each_ref(). + * Write the current version of the packed refs cache from memory to + * disk. The packed-refs file must already be locked for writing (see + * lock_packed_refs()). Return zero on success. + * Sets errno to something meaningful on error. */ -extern void add_extra_ref(const char *refname, const unsigned char *sha1, int flags); -extern void clear_extra_refs(void); +extern int commit_packed_refs(void); -extern int peel_ref(const char *, unsigned char *); +/* + * Rollback the lockfile for the packed-refs file, and discard the + * in-memory packed reference cache. (The packed-refs file will be + * read anew if it is needed again after this function is called.) + */ +extern void rollback_packed_refs(void); + +/* + * Flags for controlling behaviour of pack_refs() + * PACK_REFS_PRUNE: Prune loose refs after packing + * PACK_REFS_ALL: Pack _all_ refs, not just tags and already packed refs + */ +#define PACK_REFS_PRUNE 0x0001 +#define PACK_REFS_ALL 0x0002 -/** Locks a "refs/" ref returning the lock on success and NULL on failure. **/ -extern struct ref_lock *lock_ref_sha1(const char *ref, const unsigned char *old_sha1); +/* + * Write a packed-refs file for the current repository. + * flags: Combination of the above PACK_REFS_* flags. + */ +int pack_refs(unsigned int flags); + +/* + * Rewrite the packed-refs file, omitting any refs listed in + * 'refnames'. On error, packed-refs will be unchanged, the return + * value is nonzero, and a message about the error is written to the + * 'err' strbuf. + * + * The refs in 'refnames' needn't be sorted. `err` must not be NULL. + */ +extern int repack_without_refs(struct string_list *refnames, + struct strbuf *err); + +extern int ref_exists(const char *); + +extern int is_branch(const char *refname); + +/* + * If refname is a non-symbolic reference that refers to a tag object, + * and the tag can be (recursively) dereferenced to a non-tag object, + * store the SHA1 of the referred-to object to sha1 and return 0. If + * any of these conditions are not met, return a non-zero value. + * Symbolic references are considered unpeelable, even if they + * ultimately resolve to a peelable tag. + */ +extern int peel_ref(const char *refname, unsigned char *sha1); -/** Locks any ref (for 'HEAD' type refs). */ +/* + * Flags controlling lock_any_ref_for_update(), ref_transaction_update(), + * ref_transaction_create(), etc. + * REF_NODEREF: act on the ref directly, instead of dereferencing + * symbolic references. + * REF_DELETING: tolerate broken refs + * + * Flags >= 0x100 are reserved for internal use. + */ #define REF_NODEREF 0x01 -extern struct ref_lock *lock_any_ref_for_update(const char *ref, const unsigned char *old_sha1, int flags); +#define REF_DELETING 0x02 +/* + * This function sets errno to something meaningful on failure. + */ +extern struct ref_lock *lock_any_ref_for_update(const char *refname, + const unsigned char *old_sha1, + int flags, int *type_p); /** Close the file descriptor owned by a lock and return the status */ extern int close_ref(struct ref_lock *lock); @@ -73,19 +215,27 @@ extern int commit_ref(struct ref_lock *lock); /** Release any lock taken but not written. **/ extern void unlock_ref(struct ref_lock *lock); -/** Writes sha1 into the ref specified by the lock. **/ -extern int write_ref_sha1(struct ref_lock *lock, const unsigned char *sha1, const char *msg); - -/** Setup reflog before using. **/ -int log_ref_setup(const char *ref_name, char *logfile, int bufsize); +/* + * Setup reflog before using. Set errno to something meaningful on failure. + */ +int log_ref_setup(const char *refname, char *logfile, int bufsize); /** Reads log for the value of ref during at_time. **/ -extern int read_ref_at(const char *ref, unsigned long at_time, int cnt, unsigned char *sha1, char **msg, unsigned long *cutoff_time, int *cutoff_tz, int *cutoff_cnt); +extern int read_ref_at(const char *refname, unsigned int flags, + unsigned long at_time, int cnt, + unsigned char *sha1, char **msg, + unsigned long *cutoff_time, int *cutoff_tz, int *cutoff_cnt); + +/** Check if a particular reflog exists */ +extern int reflog_exists(const char *refname); + +/** Delete a reflog */ +extern int delete_reflog(const char *refname); /* iterate over reflog entries */ typedef int each_reflog_ent_fn(unsigned char *osha1, unsigned char *nsha1, const char *, unsigned long, int, const char *, void *); -int for_each_reflog_ent(const char *ref, each_reflog_ent_fn fn, void *cb_data); -int for_each_recent_reflog_ent(const char *ref, each_reflog_ent_fn fn, long, void *cb_data); +int for_each_reflog_ent(const char *refname, each_reflog_ent_fn fn, void *cb_data); +int for_each_reflog_ent_reverse(const char *refname, each_reflog_ent_fn fn, void *cb_data); /* * Calls the specified function for each reflog file until it returns nonzero, @@ -93,25 +243,122 @@ int for_each_recent_reflog_ent(const char *ref, each_reflog_ent_fn fn, long, voi */ extern int for_each_reflog(each_ref_fn, void *); -#define CHECK_REF_FORMAT_OK 0 -#define CHECK_REF_FORMAT_ERROR (-1) -#define CHECK_REF_FORMAT_ONELEVEL (-2) -#define CHECK_REF_FORMAT_WILDCARD (-3) -extern int check_ref_format(const char *target); +#define REFNAME_ALLOW_ONELEVEL 1 +#define REFNAME_REFSPEC_PATTERN 2 + +/* + * Return 0 iff refname has the correct format for a refname according + * to the rules described in Documentation/git-check-ref-format.txt. + * If REFNAME_ALLOW_ONELEVEL is set in flags, then accept one-level + * reference names. If REFNAME_REFSPEC_PATTERN is set in flags, then + * allow a "*" wildcard character in place of one of the name + * components. No leading or repeated slashes are accepted. + */ +extern int check_refname_format(const char *refname, int flags); extern const char *prettify_refname(const char *refname); -extern char *shorten_unambiguous_ref(const char *ref, int strict); +extern char *shorten_unambiguous_ref(const char *refname, int strict); /** rename ref, return 0 on success **/ extern int rename_ref(const char *oldref, const char *newref, const char *logmsg); -/** resolve ref in nested "gitlink" repository */ -extern int resolve_gitlink_ref(const char *name, const char *refname, unsigned char *result); +/** + * Resolve refname in the nested "gitlink" repository that is located + * at path. If the resolution is successful, return 0 and set sha1 to + * the name of the object; otherwise, return a non-zero value. + */ +extern int resolve_gitlink_ref(const char *path, const char *refname, unsigned char *sha1); + +enum action_on_err { + UPDATE_REFS_MSG_ON_ERR, + UPDATE_REFS_DIE_ON_ERR, + UPDATE_REFS_QUIET_ON_ERR +}; + +/* + * Begin a reference transaction. The reference transaction must + * be freed by calling ref_transaction_free(). + */ +struct ref_transaction *ref_transaction_begin(struct strbuf *err); + +/* + * The following functions add a reference check or update to a + * ref_transaction. In all of them, refname is the name of the + * reference to be affected. The functions make internal copies of + * refname and msg, so the caller retains ownership of these parameters. + * flags can be REF_NODEREF; it is passed to update_ref_lock(). + */ + +/* + * Add a reference update to transaction. new_sha1 is the value that + * the reference should have after the update, or zeros if it should + * be deleted. If have_old is true, then old_sha1 holds the value + * that the reference should have had before the update, or zeros if + * it must not have existed beforehand. + * Function returns 0 on success and non-zero on failure. A failure to update + * means that the transaction as a whole has failed and will need to be + * rolled back. + */ +int ref_transaction_update(struct ref_transaction *transaction, + const char *refname, + const unsigned char *new_sha1, + const unsigned char *old_sha1, + int flags, int have_old, const char *msg, + struct strbuf *err); + +/* + * Add a reference creation to transaction. new_sha1 is the value + * that the reference should have after the update; it must not be the + * null SHA-1. It is verified that the reference does not exist + * already. + * Function returns 0 on success and non-zero on failure. A failure to create + * means that the transaction as a whole has failed and will need to be + * rolled back. + */ +int ref_transaction_create(struct ref_transaction *transaction, + const char *refname, + const unsigned char *new_sha1, + int flags, const char *msg, + struct strbuf *err); -/** lock a ref and then write its file */ -enum action_on_err { MSG_ON_ERR, DIE_ON_ERR, QUIET_ON_ERR }; +/* + * Add a reference deletion to transaction. If have_old is true, then + * old_sha1 holds the value that the reference should have had before + * the update (which must not be the null SHA-1). + * Function returns 0 on success and non-zero on failure. A failure to delete + * means that the transaction as a whole has failed and will need to be + * rolled back. + */ +int ref_transaction_delete(struct ref_transaction *transaction, + const char *refname, + const unsigned char *old_sha1, + int flags, int have_old, const char *msg, + struct strbuf *err); + +/* + * Commit all of the changes that have been queued in transaction, as + * atomically as possible. + * + * Returns 0 for success, or one of the below error codes for errors. + */ +/* Naming conflict (for example, the ref names A and A/B conflict). */ +#define TRANSACTION_NAME_CONFLICT -1 +/* All other errors. */ +#define TRANSACTION_GENERIC_ERROR -2 +int ref_transaction_commit(struct ref_transaction *transaction, + struct strbuf *err); + +/* + * Free an existing transaction and all associated data. + */ +void ref_transaction_free(struct ref_transaction *transaction); + +/** Lock a ref and then write its file */ int update_ref(const char *action, const char *refname, const unsigned char *sha1, const unsigned char *oldval, int flags, enum action_on_err onerr); +extern int parse_hide_refs_config(const char *var, const char *value, const char *); +extern int ref_is_hidden(const char *); + #endif /* REFS_H */ |