d1dd721f11
Add more information to the comment introducing the four reference transaction update functions, so that each function's docstring doesn't have to repeat it. Add a pointer from the individual functions' docstrings to the introductory comment. Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu> Signed-off-by: Junio C Hamano <gitster@pobox.com>
429 lines
15 KiB
C
429 lines
15 KiB
C
#ifndef REFS_H
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#define REFS_H
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/*
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* A ref_transaction represents a collection of ref updates
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* that should succeed or fail together.
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*
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* Calling sequence
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* ----------------
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* - Allocate and initialize a `struct ref_transaction` by calling
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* `ref_transaction_begin()`.
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*
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* - List intended ref updates by calling functions like
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* `ref_transaction_update()` and `ref_transaction_create()`.
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*
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* - Call `ref_transaction_commit()` to execute the transaction.
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* If this succeeds, the ref updates will have taken place and
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* the transaction cannot be rolled back.
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*
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* - At any time call `ref_transaction_free()` to discard the
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* transaction and free associated resources. In particular,
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* this rolls back the transaction if it has not been
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* successfully committed.
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*
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* Error handling
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* --------------
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*
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* On error, transaction functions append a message about what
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* went wrong to the 'err' argument. The message mentions what
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* ref was being updated (if any) when the error occurred so it
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* can be passed to 'die' or 'error' as-is.
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*
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* The message is appended to err without first clearing err.
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* err will not be '\n' terminated.
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*/
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struct ref_transaction;
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/*
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* Bit values set in the flags argument passed to each_ref_fn():
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*/
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/* Reference is a symbolic reference. */
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#define REF_ISSYMREF 0x01
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/* Reference is a packed reference. */
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#define REF_ISPACKED 0x02
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/*
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* Reference cannot be resolved to an object name: dangling symbolic
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* reference (directly or indirectly), corrupt reference file,
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* reference exists but name is bad, or symbolic reference refers to
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* ill-formatted reference name.
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*/
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#define REF_ISBROKEN 0x04
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/*
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* Reference name is not well formed.
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*
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* See git-check-ref-format(1) for the definition of well formed ref names.
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*/
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#define REF_BAD_NAME 0x08
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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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extern void warn_dangling_symrefs(FILE *fp, const char *msg_fmt, const struct string_list *refnames);
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/*
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* Lock the packed-refs file for writing. Flags is passed to
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* hold_lock_file_for_update(). Return 0 on success.
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* Errno is set to something meaningful on error.
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*/
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extern int lock_packed_refs(int flags);
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/*
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* Add a reference to the in-memory packed reference cache. This may
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* only be called while the packed-refs file is locked (see
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* lock_packed_refs()). To actually write the packed-refs file, call
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* commit_packed_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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/*
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* Write the current version of the packed refs cache from memory to
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* disk. The packed-refs file must already be locked for writing (see
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* lock_packed_refs()). Return zero on success.
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* Sets errno to something meaningful on error.
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*/
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extern int commit_packed_refs(void);
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/*
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* Rollback the lockfile for the packed-refs file, and discard the
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* in-memory packed reference cache. (The packed-refs file will be
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* read anew if it is needed again after this function is called.)
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*/
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extern void rollback_packed_refs(void);
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/*
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* Flags for controlling behaviour of pack_refs()
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* PACK_REFS_PRUNE: Prune loose refs after packing
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* PACK_REFS_ALL: Pack _all_ refs, not just tags and already packed refs
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*/
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#define PACK_REFS_PRUNE 0x0001
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#define PACK_REFS_ALL 0x0002
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/*
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* Write a packed-refs file for the current repository.
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* flags: Combination of the above PACK_REFS_* flags.
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*/
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int pack_refs(unsigned int flags);
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/*
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* Rewrite the packed-refs file, omitting any refs listed in
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* 'refnames'. On error, packed-refs will be unchanged, the return
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* value is nonzero, and a message about the error is written to the
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* 'err' strbuf.
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*
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* The refs in 'refnames' needn't be sorted. `err` must not be NULL.
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*/
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extern int repack_without_refs(struct string_list *refnames,
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struct strbuf *err);
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extern int ref_exists(const char *);
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extern int is_branch(const char *refname);
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/*
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* If refname is a non-symbolic reference that refers to a tag object,
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* and the tag can be (recursively) dereferenced to a non-tag object,
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* store the SHA1 of the referred-to object to sha1 and return 0. If
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* any of these conditions are not met, return a non-zero value.
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* Symbolic references are considered unpeelable, even if they
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* ultimately resolve to a peelable tag.
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*/
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extern int peel_ref(const char *refname, unsigned char *sha1);
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/*
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* Flags controlling ref_transaction_update(), ref_transaction_create(), etc.
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* REF_NODEREF: act on the ref directly, instead of dereferencing
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* symbolic references.
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*
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* Other flags are reserved for internal use.
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*/
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#define REF_NODEREF 0x01
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/*
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* Setup reflog before using. Set errno to something meaningful on failure.
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*/
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int log_ref_setup(const char *refname, 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 int flags,
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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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/** Check if a particular reflog exists */
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extern int reflog_exists(const char *refname);
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/** Delete a reflog */
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extern int delete_reflog(const char *refname);
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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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/*
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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.
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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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enum action_on_err {
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UPDATE_REFS_MSG_ON_ERR,
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UPDATE_REFS_DIE_ON_ERR,
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UPDATE_REFS_QUIET_ON_ERR
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};
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/*
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* Begin a reference transaction. The reference transaction must
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* be freed by calling ref_transaction_free().
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*/
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struct ref_transaction *ref_transaction_begin(struct strbuf *err);
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/*
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* Reference transaction updates
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*
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* The following four functions add a reference check or update to a
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* ref_transaction. They have some common similar parameters:
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*
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* transaction -- a pointer to an open ref_transaction, obtained
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* from ref_transaction_begin().
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*
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* refname -- the name of the reference to be affected.
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*
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* flags -- flags affecting the update, passed to
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* update_ref_lock(). Can be REF_NODEREF, which means that
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* symbolic references should not be followed.
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*
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* msg -- a message describing the change (for the reflog).
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*
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* err -- a strbuf for receiving a description of any error that
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* might have occured.
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*
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* The functions make internal copies of refname and msg, so the
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* caller retains ownership of these parameters.
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*
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* The functions return 0 on success and non-zero on failure. A
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* failure means that the transaction as a whole has failed and needs
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* to be rolled back.
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*/
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/*
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* Add a reference update to transaction. new_sha1 is the value that
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* the reference should have after the update, or null_sha1 if it
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* should be deleted. If new_sha1 is NULL, then the reference is not
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* changed at all. old_sha1 is the value that the reference must have
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* before the update, or null_sha1 if it must not have existed
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* beforehand. The old value is checked after the lock is taken to
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* prevent races. If the old value doesn't agree with old_sha1, the
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* whole transaction fails. If old_sha1 is NULL, then the previous
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* value is not checked.
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*
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* See the above comment "Reference transaction updates" for more
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* information.
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*/
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int ref_transaction_update(struct ref_transaction *transaction,
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const char *refname,
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const unsigned char *new_sha1,
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const unsigned char *old_sha1,
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unsigned int flags, const char *msg,
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struct strbuf *err);
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/*
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* Add a reference creation to transaction. new_sha1 is the value that
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* the reference should have after the update; it must not be
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* null_sha1. It is verified that the reference does not exist
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* already.
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*
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* See the above comment "Reference transaction updates" for more
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* information.
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*/
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int ref_transaction_create(struct ref_transaction *transaction,
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const char *refname,
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const unsigned char *new_sha1,
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unsigned int flags, const char *msg,
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struct strbuf *err);
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/*
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* Add a reference deletion to transaction. If old_sha1 is non-NULL,
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* then it holds the value that the reference should have had before
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* the update (which must not be null_sha1).
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*
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* See the above comment "Reference transaction updates" for more
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* information.
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*/
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int ref_transaction_delete(struct ref_transaction *transaction,
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const char *refname,
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const unsigned char *old_sha1,
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unsigned int flags, const char *msg,
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struct strbuf *err);
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/*
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* Verify, within a transaction, that refname has the value old_sha1,
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* or, if old_sha1 is null_sha1, then verify that the reference
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* doesn't exist. old_sha1 must be non-NULL.
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*
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* See the above comment "Reference transaction updates" for more
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* information.
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*/
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int ref_transaction_verify(struct ref_transaction *transaction,
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const char *refname,
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const unsigned char *old_sha1,
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unsigned int flags,
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struct strbuf *err);
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/*
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* Commit all of the changes that have been queued in transaction, as
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* atomically as possible.
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*
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* Returns 0 for success, or one of the below error codes for errors.
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*/
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/* Naming conflict (for example, the ref names A and A/B conflict). */
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#define TRANSACTION_NAME_CONFLICT -1
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/* All other errors. */
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#define TRANSACTION_GENERIC_ERROR -2
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int ref_transaction_commit(struct ref_transaction *transaction,
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struct strbuf *err);
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/*
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* Free an existing transaction and all associated data.
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*/
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void ref_transaction_free(struct ref_transaction *transaction);
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/**
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* Lock, update, and unlock a single reference. This function
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* basically does a transaction containing a single call to
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* ref_transaction_update(). The parameters to this function have the
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* same meaning as the corresponding parameters to
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* ref_transaction_update(). Handle errors as requested by the `onerr`
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* argument.
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*/
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int update_ref(const char *msg, const char *refname,
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const unsigned char *new_sha1, const unsigned char *old_sha1,
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unsigned 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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enum expire_reflog_flags {
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EXPIRE_REFLOGS_DRY_RUN = 1 << 0,
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EXPIRE_REFLOGS_UPDATE_REF = 1 << 1,
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EXPIRE_REFLOGS_VERBOSE = 1 << 2,
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EXPIRE_REFLOGS_REWRITE = 1 << 3
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};
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/*
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* The following interface is used for reflog expiration. The caller
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* calls reflog_expire(), supplying it with three callback functions,
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* of the following types. The callback functions define the
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* expiration policy that is desired.
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*
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* reflog_expiry_prepare_fn -- Called once after the reference is
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* locked.
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*
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* reflog_expiry_should_prune_fn -- Called once for each entry in the
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* existing reflog. It should return true iff that entry should be
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* pruned.
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*
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* reflog_expiry_cleanup_fn -- Called once before the reference is
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* unlocked again.
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*/
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typedef void reflog_expiry_prepare_fn(const char *refname,
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const unsigned char *sha1,
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void *cb_data);
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typedef int reflog_expiry_should_prune_fn(unsigned char *osha1,
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unsigned char *nsha1,
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const char *email,
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unsigned long timestamp, int tz,
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const char *message, void *cb_data);
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typedef void reflog_expiry_cleanup_fn(void *cb_data);
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/*
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* Expire reflog entries for the specified reference. sha1 is the old
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* value of the reference. flags is a combination of the constants in
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* enum expire_reflog_flags. The three function pointers are described
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* above. On success, return zero.
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*/
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extern int reflog_expire(const char *refname, const unsigned char *sha1,
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unsigned int flags,
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reflog_expiry_prepare_fn prepare_fn,
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reflog_expiry_should_prune_fn should_prune_fn,
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reflog_expiry_cleanup_fn cleanup_fn,
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void *policy_cb_data);
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#endif /* REFS_H */
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