Revision c62bc49139f1d18e922fc98e35bb08b1aadbcafc authored by Junio C Hamano on 02 August 2019, 20:12:02 UTC, committed by Junio C Hamano on 02 August 2019, 20:12:02 UTC
Support building Git with Visual Studio The bits about .git/branches/* have been dropped from the series. We may want to drop the support for it, but until that happens, the tests should rely on the existence of the support to pass. * js/visual-studio: (23 commits) git: avoid calling aliased builtins via their dashed form bin-wrappers: append `.exe` to target paths if necessary .gitignore: ignore Visual Studio's temporary/generated files .gitignore: touch up the entries regarding Visual Studio vcxproj: also link-or-copy builtins msvc: add a Makefile target to pre-generate the Visual Studio solution contrib/buildsystems: add a backend for modern Visual Studio versions contrib/buildsystems: handle options starting with a slash contrib/buildsystems: also handle -lexpat contrib/buildsystems: handle libiconv, too contrib/buildsystems: handle the curl library option contrib/buildsystems: error out on unknown option contrib/buildsystems: optionally capture the dry-run in a file contrib/buildsystems: redirect errors of the dry run into a log file contrib/buildsystems: ignore gettext stuff contrib/buildsystems: handle quoted spaces in filenames contrib/buildsystems: fix misleading error message contrib/buildsystems: ignore irrelevant files in Generators/ contrib/buildsystems: ignore invalidcontinue.obj Vcproj.pm: urlencode '<' and '>' when generating VC projects ...
refs-internal.h
#ifndef REFS_REFS_INTERNAL_H
#define REFS_REFS_INTERNAL_H
#include "cache.h"
#include "refs.h"
#include "iterator.h"
struct ref_transaction;
/*
* Data structures and functions for the internal use of the refs
* module. Code outside of the refs module should use only the public
* functions defined in "refs.h", and should *not* include this file.
*/
/*
* The following flags can appear in `ref_update::flags`. Their
* numerical values must not conflict with those of REF_NO_DEREF and
* REF_FORCE_CREATE_REFLOG, which are also stored in
* `ref_update::flags`.
*/
/*
* The reference should be updated to new_oid.
*/
#define REF_HAVE_NEW (1 << 2)
/*
* The current reference's value should be checked to make sure that
* it agrees with old_oid.
*/
#define REF_HAVE_OLD (1 << 3)
/*
* Return the length of time to retry acquiring a loose reference lock
* before giving up, in milliseconds:
*/
long get_files_ref_lock_timeout_ms(void);
/*
* Return true iff refname is minimally safe. "Safe" here means that
* deleting a loose reference by this name will not do any damage, for
* example by causing a file that is not a reference to be deleted.
* This function does not check that the reference name is legal; for
* that, use check_refname_format().
*
* A refname that starts with "refs/" is considered safe iff it
* doesn't contain any "." or ".." components or consecutive '/'
* characters, end with '/', or (on Windows) contain any '\'
* characters. Names that do not start with "refs/" are considered
* safe iff they consist entirely of upper case characters and '_'
* (like "HEAD" and "MERGE_HEAD" but not "config" or "FOO/BAR").
*/
int refname_is_safe(const char *refname);
/*
* Helper function: return true if refname, which has the specified
* oid and flags, can be resolved to an object in the database. If the
* referred-to object does not exist, emit a warning and return false.
*/
int ref_resolves_to_object(const char *refname,
const struct object_id *oid,
unsigned int flags);
enum peel_status {
/* object was peeled successfully: */
PEEL_PEELED = 0,
/*
* object cannot be peeled because the named object (or an
* object referred to by a tag in the peel chain), does not
* exist.
*/
PEEL_INVALID = -1,
/* object cannot be peeled because it is not a tag: */
PEEL_NON_TAG = -2,
/* ref_entry contains no peeled value because it is a symref: */
PEEL_IS_SYMREF = -3,
/*
* ref_entry cannot be peeled because it is broken (i.e., the
* symbolic reference cannot even be resolved to an object
* name):
*/
PEEL_BROKEN = -4
};
/*
* Peel the named object; i.e., if the object is a tag, resolve the
* tag recursively until a non-tag is found. If successful, store the
* result to oid and return PEEL_PEELED. If the object is not a tag
* or is not valid, return PEEL_NON_TAG or PEEL_INVALID, respectively,
* and leave oid unchanged.
*/
enum peel_status peel_object(const struct object_id *name, struct object_id *oid);
/*
* Copy the reflog message msg to sb while cleaning up the whitespaces.
* Especially, convert LF to space, because reflog file is one line per entry.
*/
void copy_reflog_msg(struct strbuf *sb, const char *msg);
/**
* Information needed for a single ref update. Set new_oid to the new
* value or to null_oid to delete the ref. To check the old value
* while the ref is locked, set (flags & REF_HAVE_OLD) and set old_oid
* to the old value, or to null_oid to ensure the ref does not exist
* before update.
*/
struct ref_update {
/*
* If (flags & REF_HAVE_NEW), set the reference to this value
* (or delete it, if `new_oid` is `null_oid`).
*/
struct object_id new_oid;
/*
* If (flags & REF_HAVE_OLD), check that the reference
* previously had this value (or didn't previously exist, if
* `old_oid` is `null_oid`).
*/
struct object_id old_oid;
/*
* One or more of REF_NO_DEREF, REF_FORCE_CREATE_REFLOG,
* REF_HAVE_NEW, REF_HAVE_OLD, or backend-specific flags.
*/
unsigned int flags;
void *backend_data;
unsigned int type;
char *msg;
/*
* If this ref_update was split off of a symref update via
* split_symref_update(), then this member points at that
* update. This is used for two purposes:
* 1. When reporting errors, we report the refname under which
* the update was originally requested.
* 2. When we read the old value of this reference, we
* propagate it back to its parent update for recording in
* the latter's reflog.
*/
struct ref_update *parent_update;
const char refname[FLEX_ARRAY];
};
int refs_read_raw_ref(struct ref_store *ref_store,
const char *refname, struct object_id *oid,
struct strbuf *referent, unsigned int *type);
/*
* Write an error to `err` and return a nonzero value iff the same
* refname appears multiple times in `refnames`. `refnames` must be
* sorted on entry to this function.
*/
int ref_update_reject_duplicates(struct string_list *refnames,
struct strbuf *err);
/*
* Add a ref_update with the specified properties to transaction, and
* return a pointer to the new object. This function does not verify
* that refname is well-formed. new_oid and old_oid are only
* dereferenced if the REF_HAVE_NEW and REF_HAVE_OLD bits,
* respectively, are set in flags.
*/
struct ref_update *ref_transaction_add_update(
struct ref_transaction *transaction,
const char *refname, unsigned int flags,
const struct object_id *new_oid,
const struct object_id *old_oid,
const char *msg);
/*
* Transaction states.
*
* OPEN: The transaction is initialized and new updates can still be
* added to it. An OPEN transaction can be prepared,
* committed, freed, or aborted (freeing and aborting an open
* transaction are equivalent).
*
* PREPARED: ref_transaction_prepare(), which locks all of the
* references involved in the update and checks that the
* update has no errors, has been called successfully for the
* transaction. A PREPARED transaction can be committed or
* aborted.
*
* CLOSED: The transaction is no longer active. A transaction becomes
* CLOSED if there is a failure while building the transaction
* or if a transaction is committed or aborted. A CLOSED
* transaction can only be freed.
*/
enum ref_transaction_state {
REF_TRANSACTION_OPEN = 0,
REF_TRANSACTION_PREPARED = 1,
REF_TRANSACTION_CLOSED = 2
};
/*
* Data structure for holding a reference transaction, which can
* consist of checks and updates to multiple references, carried out
* as atomically as possible. This structure is opaque to callers.
*/
struct ref_transaction {
struct ref_store *ref_store;
struct ref_update **updates;
size_t alloc;
size_t nr;
enum ref_transaction_state state;
void *backend_data;
};
/*
* Check for entries in extras that are within the specified
* directory, where dirname is a reference directory name including
* the trailing slash (e.g., "refs/heads/foo/"). Ignore any
* conflicting references that are found in skip. If there is a
* conflicting reference, return its name.
*
* extras and skip must be sorted lists of reference names. Either one
* can be NULL, signifying the empty list.
*/
const char *find_descendant_ref(const char *dirname,
const struct string_list *extras,
const struct string_list *skip);
/*
* Check whether an attempt to rename old_refname to new_refname would
* cause a D/F conflict with any existing reference (other than
* possibly old_refname). If there would be a conflict, emit an error
* message and return false; otherwise, return true.
*
* Note that this function is not safe against all races with other
* processes (though rename_ref() catches some races that might get by
* this check).
*/
int refs_rename_ref_available(struct ref_store *refs,
const char *old_refname,
const char *new_refname);
/* We allow "recursive" symbolic refs. Only within reason, though */
#define SYMREF_MAXDEPTH 5
/* Include broken references in a do_for_each_ref*() iteration: */
#define DO_FOR_EACH_INCLUDE_BROKEN 0x01
/*
* Reference iterators
*
* A reference iterator encapsulates the state of an in-progress
* iteration over references. Create an instance of `struct
* ref_iterator` via one of the functions in this module.
*
* A freshly-created ref_iterator doesn't yet point at a reference. To
* advance the iterator, call ref_iterator_advance(). If successful,
* this sets the iterator's refname, oid, and flags fields to describe
* the next reference and returns ITER_OK. The data pointed at by
* refname and oid belong to the iterator; if you want to retain them
* after calling ref_iterator_advance() again or calling
* ref_iterator_abort(), you must make a copy. When the iteration has
* been exhausted, ref_iterator_advance() releases any resources
* assocated with the iteration, frees the ref_iterator object, and
* returns ITER_DONE. If you want to abort the iteration early, call
* ref_iterator_abort(), which also frees the ref_iterator object and
* any associated resources. If there was an internal error advancing
* to the next entry, ref_iterator_advance() aborts the iteration,
* frees the ref_iterator, and returns ITER_ERROR.
*
* The reference currently being looked at can be peeled by calling
* ref_iterator_peel(). This function is often faster than peel_ref(),
* so it should be preferred when iterating over references.
*
* Putting it all together, a typical iteration looks like this:
*
* int ok;
* struct ref_iterator *iter = ...;
*
* while ((ok = ref_iterator_advance(iter)) == ITER_OK) {
* if (want_to_stop_iteration()) {
* ok = ref_iterator_abort(iter);
* break;
* }
*
* // Access information about the current reference:
* if (!(iter->flags & REF_ISSYMREF))
* printf("%s is %s\n", iter->refname, oid_to_hex(iter->oid));
*
* // If you need to peel the reference:
* ref_iterator_peel(iter, &oid);
* }
*
* if (ok != ITER_DONE)
* handle_error();
*/
struct ref_iterator {
struct ref_iterator_vtable *vtable;
/*
* Does this `ref_iterator` iterate over references in order
* by refname?
*/
unsigned int ordered : 1;
const char *refname;
const struct object_id *oid;
unsigned int flags;
};
/*
* Advance the iterator to the first or next item and return ITER_OK.
* If the iteration is exhausted, free the resources associated with
* the ref_iterator and return ITER_DONE. On errors, free the iterator
* resources and return ITER_ERROR. It is a bug to use ref_iterator or
* call this function again after it has returned ITER_DONE or
* ITER_ERROR.
*/
int ref_iterator_advance(struct ref_iterator *ref_iterator);
/*
* If possible, peel the reference currently being viewed by the
* iterator. Return 0 on success.
*/
int ref_iterator_peel(struct ref_iterator *ref_iterator,
struct object_id *peeled);
/*
* End the iteration before it has been exhausted, freeing the
* reference iterator and any associated resources and returning
* ITER_DONE. If the abort itself failed, return ITER_ERROR.
*/
int ref_iterator_abort(struct ref_iterator *ref_iterator);
/*
* An iterator over nothing (its first ref_iterator_advance() call
* returns ITER_DONE).
*/
struct ref_iterator *empty_ref_iterator_begin(void);
/*
* Return true iff ref_iterator is an empty_ref_iterator.
*/
int is_empty_ref_iterator(struct ref_iterator *ref_iterator);
/*
* Return an iterator that goes over each reference in `refs` for
* which the refname begins with prefix. If trim is non-zero, then
* trim that many characters off the beginning of each refname. flags
* can be DO_FOR_EACH_INCLUDE_BROKEN to include broken references in
* the iteration. The output is ordered by refname.
*/
struct ref_iterator *refs_ref_iterator_begin(
struct ref_store *refs,
const char *prefix, int trim, int flags);
/*
* A callback function used to instruct merge_ref_iterator how to
* interleave the entries from iter0 and iter1. The function should
* return one of the constants defined in enum iterator_selection. It
* must not advance either of the iterators itself.
*
* The function must be prepared to handle the case that iter0 and/or
* iter1 is NULL, which indicates that the corresponding sub-iterator
* has been exhausted. Its return value must be consistent with the
* current states of the iterators; e.g., it must not return
* ITER_SKIP_1 if iter1 has already been exhausted.
*/
typedef enum iterator_selection ref_iterator_select_fn(
struct ref_iterator *iter0, struct ref_iterator *iter1,
void *cb_data);
/*
* Iterate over the entries from iter0 and iter1, with the values
* interleaved as directed by the select function. The iterator takes
* ownership of iter0 and iter1 and frees them when the iteration is
* over. A derived class should set `ordered` to 1 or 0 based on
* whether it generates its output in order by reference name.
*/
struct ref_iterator *merge_ref_iterator_begin(
int ordered,
struct ref_iterator *iter0, struct ref_iterator *iter1,
ref_iterator_select_fn *select, void *cb_data);
/*
* An iterator consisting of the union of the entries from front and
* back. If there are entries common to the two sub-iterators, use the
* one from front. Each iterator must iterate over its entries in
* strcmp() order by refname for this to work.
*
* The new iterator takes ownership of its arguments and frees them
* when the iteration is over. As a convenience to callers, if front
* or back is an empty_ref_iterator, then abort that one immediately
* and return the other iterator directly, without wrapping it.
*/
struct ref_iterator *overlay_ref_iterator_begin(
struct ref_iterator *front, struct ref_iterator *back);
/*
* Wrap iter0, only letting through the references whose names start
* with prefix. If trim is set, set iter->refname to the name of the
* reference with that many characters trimmed off the front;
* otherwise set it to the full refname. The new iterator takes over
* ownership of iter0 and frees it when iteration is over. It makes
* its own copy of prefix.
*
* As an convenience to callers, if prefix is the empty string and
* trim is zero, this function returns iter0 directly, without
* wrapping it.
*
* The resulting ref_iterator is ordered if iter0 is.
*/
struct ref_iterator *prefix_ref_iterator_begin(struct ref_iterator *iter0,
const char *prefix,
int trim);
/* Internal implementation of reference iteration: */
/*
* Base class constructor for ref_iterators. Initialize the
* ref_iterator part of iter, setting its vtable pointer as specified.
* `ordered` should be set to 1 if the iterator will iterate over
* references in order by refname; otherwise it should be set to 0.
* This is meant to be called only by the initializers of derived
* classes.
*/
void base_ref_iterator_init(struct ref_iterator *iter,
struct ref_iterator_vtable *vtable,
int ordered);
/*
* Base class destructor for ref_iterators. Destroy the ref_iterator
* part of iter and shallow-free the object. This is meant to be
* called only by the destructors of derived classes.
*/
void base_ref_iterator_free(struct ref_iterator *iter);
/* Virtual function declarations for ref_iterators: */
typedef int ref_iterator_advance_fn(struct ref_iterator *ref_iterator);
typedef int ref_iterator_peel_fn(struct ref_iterator *ref_iterator,
struct object_id *peeled);
/*
* Implementations of this function should free any resources specific
* to the derived class, then call base_ref_iterator_free() to clean
* up and free the ref_iterator object.
*/
typedef int ref_iterator_abort_fn(struct ref_iterator *ref_iterator);
struct ref_iterator_vtable {
ref_iterator_advance_fn *advance;
ref_iterator_peel_fn *peel;
ref_iterator_abort_fn *abort;
};
/*
* current_ref_iter is a performance hack: when iterating over
* references using the for_each_ref*() functions, current_ref_iter is
* set to the reference iterator before calling the callback function.
* If the callback function calls peel_ref(), then peel_ref() first
* checks whether the reference to be peeled is the one referred to by
* the iterator (it usually is) and if so, asks the iterator for the
* peeled version of the reference if it is available. This avoids a
* refname lookup in a common case. current_ref_iter is set to NULL
* when the iteration is over.
*/
extern struct ref_iterator *current_ref_iter;
/*
* The common backend for the for_each_*ref* functions. Call fn for
* each reference in iter. If the iterator itself ever returns
* ITER_ERROR, return -1. If fn ever returns a non-zero value, stop
* the iteration and return that value. Otherwise, return 0. In any
* case, free the iterator when done. This function is basically an
* adapter between the callback style of reference iteration and the
* iterator style.
*/
int do_for_each_repo_ref_iterator(struct repository *r,
struct ref_iterator *iter,
each_repo_ref_fn fn, void *cb_data);
/*
* Only include per-worktree refs in a do_for_each_ref*() iteration.
* Normally this will be used with a files ref_store, since that's
* where all reference backends will presumably store their
* per-worktree refs.
*/
#define DO_FOR_EACH_PER_WORKTREE_ONLY 0x02
struct ref_store;
/* refs backends */
/* ref_store_init flags */
#define REF_STORE_READ (1 << 0)
#define REF_STORE_WRITE (1 << 1) /* can perform update operations */
#define REF_STORE_ODB (1 << 2) /* has access to object database */
#define REF_STORE_MAIN (1 << 3)
#define REF_STORE_ALL_CAPS (REF_STORE_READ | \
REF_STORE_WRITE | \
REF_STORE_ODB | \
REF_STORE_MAIN)
/*
* Initialize the ref_store for the specified gitdir. These functions
* should call base_ref_store_init() to initialize the shared part of
* the ref_store and to record the ref_store for later lookup.
*/
typedef struct ref_store *ref_store_init_fn(const char *gitdir,
unsigned int flags);
typedef int ref_init_db_fn(struct ref_store *refs, struct strbuf *err);
typedef int ref_transaction_prepare_fn(struct ref_store *refs,
struct ref_transaction *transaction,
struct strbuf *err);
typedef int ref_transaction_finish_fn(struct ref_store *refs,
struct ref_transaction *transaction,
struct strbuf *err);
typedef int ref_transaction_abort_fn(struct ref_store *refs,
struct ref_transaction *transaction,
struct strbuf *err);
typedef int ref_transaction_commit_fn(struct ref_store *refs,
struct ref_transaction *transaction,
struct strbuf *err);
typedef int pack_refs_fn(struct ref_store *ref_store, unsigned int flags);
typedef int create_symref_fn(struct ref_store *ref_store,
const char *ref_target,
const char *refs_heads_master,
const char *logmsg);
typedef int delete_refs_fn(struct ref_store *ref_store, const char *msg,
struct string_list *refnames, unsigned int flags);
typedef int rename_ref_fn(struct ref_store *ref_store,
const char *oldref, const char *newref,
const char *logmsg);
typedef int copy_ref_fn(struct ref_store *ref_store,
const char *oldref, const char *newref,
const char *logmsg);
/*
* Iterate over the references in `ref_store` whose names start with
* `prefix`. `prefix` is matched as a literal string, without regard
* for path separators. If prefix is NULL or the empty string, iterate
* over all references in `ref_store`. The output is ordered by
* refname.
*/
typedef struct ref_iterator *ref_iterator_begin_fn(
struct ref_store *ref_store,
const char *prefix, unsigned int flags);
/* reflog functions */
/*
* Iterate over the references in the specified ref_store that have a
* reflog. The refs are iterated over in arbitrary order.
*/
typedef struct ref_iterator *reflog_iterator_begin_fn(
struct ref_store *ref_store);
typedef int for_each_reflog_ent_fn(struct ref_store *ref_store,
const char *refname,
each_reflog_ent_fn fn,
void *cb_data);
typedef int for_each_reflog_ent_reverse_fn(struct ref_store *ref_store,
const char *refname,
each_reflog_ent_fn fn,
void *cb_data);
typedef int reflog_exists_fn(struct ref_store *ref_store, const char *refname);
typedef int create_reflog_fn(struct ref_store *ref_store, const char *refname,
int force_create, struct strbuf *err);
typedef int delete_reflog_fn(struct ref_store *ref_store, const char *refname);
typedef int reflog_expire_fn(struct ref_store *ref_store,
const char *refname, const struct object_id *oid,
unsigned int flags,
reflog_expiry_prepare_fn prepare_fn,
reflog_expiry_should_prune_fn should_prune_fn,
reflog_expiry_cleanup_fn cleanup_fn,
void *policy_cb_data);
/*
* Read a reference from the specified reference store, non-recursively.
* Set type to describe the reference, and:
*
* - If refname is the name of a normal reference, fill in oid
* (leaving referent unchanged).
*
* - If refname is the name of a symbolic reference, write the full
* name of the reference to which it refers (e.g.
* "refs/heads/master") to referent and set the REF_ISSYMREF bit in
* type (leaving oid unchanged). The caller is responsible for
* validating that referent is a valid reference name.
*
* WARNING: refname might be used as part of a filename, so it is
* important from a security standpoint that it be safe in the sense
* of refname_is_safe(). Moreover, for symrefs this function sets
* referent to whatever the repository says, which might not be a
* properly-formatted or even safe reference name. NEITHER INPUT NOR
* OUTPUT REFERENCE NAMES ARE VALIDATED WITHIN THIS FUNCTION.
*
* Return 0 on success. If the ref doesn't exist, set errno to ENOENT
* and return -1. If the ref exists but is neither a symbolic ref nor
* an object ID, it is broken; set REF_ISBROKEN in type, set errno to
* EINVAL, and return -1. If there is another error reading the ref,
* set errno appropriately and return -1.
*
* Backend-specific flags might be set in type as well, regardless of
* outcome.
*
* It is OK for refname to point into referent. If so:
*
* - if the function succeeds with REF_ISSYMREF, referent will be
* overwritten and the memory formerly pointed to by it might be
* changed or even freed.
*
* - in all other cases, referent will be untouched, and therefore
* refname will still be valid and unchanged.
*/
typedef int read_raw_ref_fn(struct ref_store *ref_store,
const char *refname, struct object_id *oid,
struct strbuf *referent, unsigned int *type);
struct ref_storage_be {
struct ref_storage_be *next;
const char *name;
ref_store_init_fn *init;
ref_init_db_fn *init_db;
ref_transaction_prepare_fn *transaction_prepare;
ref_transaction_finish_fn *transaction_finish;
ref_transaction_abort_fn *transaction_abort;
ref_transaction_commit_fn *initial_transaction_commit;
pack_refs_fn *pack_refs;
create_symref_fn *create_symref;
delete_refs_fn *delete_refs;
rename_ref_fn *rename_ref;
copy_ref_fn *copy_ref;
ref_iterator_begin_fn *iterator_begin;
read_raw_ref_fn *read_raw_ref;
reflog_iterator_begin_fn *reflog_iterator_begin;
for_each_reflog_ent_fn *for_each_reflog_ent;
for_each_reflog_ent_reverse_fn *for_each_reflog_ent_reverse;
reflog_exists_fn *reflog_exists;
create_reflog_fn *create_reflog;
delete_reflog_fn *delete_reflog;
reflog_expire_fn *reflog_expire;
};
extern struct ref_storage_be refs_be_files;
extern struct ref_storage_be refs_be_packed;
/*
* A representation of the reference store for the main repository or
* a submodule. The ref_store instances for submodules are kept in a
* linked list.
*/
struct ref_store {
/* The backend describing this ref_store's storage scheme: */
const struct ref_storage_be *be;
};
/*
* Fill in the generic part of refs and add it to our collection of
* reference stores.
*/
void base_ref_store_init(struct ref_store *refs,
const struct ref_storage_be *be);
#endif /* REFS_REFS_INTERNAL_H */
![swh spinner](/static/img/swh-spinner.gif)
Computing file changes ...