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packed_ref_store: new struct

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Start extracting the packed-refs-related data structures into a new
class, `packed_ref_store`. It doesn't yet implement `ref_store`, but
it will.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Michael Haggerty 2017-06-23 09:01:21 +02:00 committed by Junio C Hamano
parent 2f10882166
commit bdf55fa6b2
1 changed files with 33 additions and 9 deletions
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42
refs/files-backend.c
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@ -47,6 +47,28 @@ struct packed_ref_cache {
struct stat_validity validity;
};
/*
* A container for `packed-refs`-related data. It is not (yet) a
* `ref_store`.
*/
struct packed_ref_store {
unsigned int store_flags;
/*
* A cache of the values read from the `packed-refs` file, if
* it might still be current; otherwise, NULL.
*/
struct packed_ref_cache *cache;
};
static struct packed_ref_store *packed_ref_store_create(unsigned int store_flags)
{
struct packed_ref_store *refs = xcalloc(1, sizeof(*refs));
refs->store_flags = store_flags;
return refs;
}
/*
* Future: need to be in "struct repository"
* when doing a full libification.
@ -60,13 +82,14 @@ struct files_ref_store {
char *packed_refs_path;
struct ref_cache *loose;
struct packed_ref_cache *packed;
/*
* Lock used for the "packed-refs" file. Note that this (and
* thus the enclosing `files_ref_store`) must not be freed.
*/
struct lock_file packed_refs_lock;
struct packed_ref_store *packed_ref_store;
};
/*
@ -95,12 +118,12 @@ static int release_packed_ref_cache(struct packed_ref_cache *packed_refs)
static void clear_packed_ref_cache(struct files_ref_store *refs)
{
if (refs->packed) {
struct packed_ref_cache *packed_refs = refs->packed;
if (refs->packed_ref_store->cache) {
struct packed_ref_cache *packed_refs = refs->packed_ref_store->cache;
if (is_lock_file_locked(&refs->packed_refs_lock))
die("BUG: packed-ref cache cleared while locked");
refs->packed = NULL;
refs->packed_ref_store->cache = NULL;
release_packed_ref_cache(packed_refs);
}
}
@ -132,6 +155,7 @@ static struct ref_store *files_ref_store_create(const char *gitdir,
refs->gitcommondir = strbuf_detach(&sb, NULL);
strbuf_addf(&sb, "%s/packed-refs", refs->gitcommondir);
refs->packed_refs_path = strbuf_detach(&sb, NULL);
refs->packed_ref_store = packed_ref_store_create(flags);
return ref_store;
}
@ -375,8 +399,8 @@ static void files_ref_path(struct files_ref_store *refs,
*/
static void validate_packed_ref_cache(struct files_ref_store *refs)
{
if (refs->packed &&
!stat_validity_check(&refs->packed->validity,
if (refs->packed_ref_store->cache &&
!stat_validity_check(&refs->packed_ref_store->cache->validity,
files_packed_refs_path(refs)))
clear_packed_ref_cache(refs);
}
@ -396,10 +420,10 @@ static struct packed_ref_cache *get_packed_ref_cache(struct files_ref_store *ref
if (!is_lock_file_locked(&refs->packed_refs_lock))
validate_packed_ref_cache(refs);
if (!refs->packed)
refs->packed = read_packed_refs(packed_refs_file);
if (!refs->packed_ref_store->cache)
refs->packed_ref_store->cache = read_packed_refs(packed_refs_file);
return refs->packed;
return refs->packed_ref_store->cache;
}
static struct ref_dir *get_packed_ref_dir(struct packed_ref_cache *packed_ref_cache)