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refs: wrap the packed refs cache in a level of indirection 

As we know, we can solve any problem in this manner.  In this case,
the problem is to avoid freeing a packed refs cache while somebody is
using it.  So add a level of indirection as a prelude to
reference-counting the packed refs cache.

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 2013-06-20 10:37:45 +02:00 committed by Junio C Hamano
parent 267f9a8cc8
commit 2fff781290
1 changed files with 26 additions and 6 deletions
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32
refs.c
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@ -806,6 +806,10 @@ static int is_refname_available(const char *refname, const char *oldrefname,
return 1;
}
struct packed_ref_cache {
struct ref_entry *root;
};
/*
* Future: need to be in "struct repository"
* when doing a full libification.
@ -813,7 +817,7 @@ static int is_refname_available(const char *refname, const char *oldrefname,
static struct ref_cache {
struct ref_cache *next;
struct ref_entry *loose;
struct ref_entry *packed;
struct packed_ref_cache *packed;
/*
* The submodule name, or "" for the main repo. We allocate
* length 1 rather than FLEX_ARRAY so that the main ref_cache
@ -825,7 +829,8 @@ static struct ref_cache {
static void clear_packed_ref_cache(struct ref_cache *refs)
{
if (refs->packed) {
free_ref_entry(refs->packed);
free_ref_entry(refs->packed->root);
free(refs->packed);
refs->packed = NULL;
}
}
@ -996,24 +1001,39 @@ static void read_packed_refs(FILE *f, struct ref_dir *dir)
}
}
static struct ref_dir *get_packed_refs(struct ref_cache *refs)
/*
* Get the packed_ref_cache for the specified ref_cache, creating it
* if necessary.
*/
static struct packed_ref_cache *get_packed_ref_cache(struct ref_cache *refs)
{
if (!refs->packed) {
const char *packed_refs_file;
FILE *f;
refs->packed = create_dir_entry(refs, "", 0, 0);
refs->packed = xcalloc(1, sizeof(*refs->packed));
refs->packed->root = create_dir_entry(refs, "", 0, 0);
if (*refs->name)
packed_refs_file = git_path_submodule(refs->name, "packed-refs");
else
packed_refs_file = git_path("packed-refs");
f = fopen(packed_refs_file, "r");
if (f) {
read_packed_refs(f, get_ref_dir(refs->packed));
read_packed_refs(f, get_ref_dir(refs->packed->root));
fclose(f);
}
}
return get_ref_dir(refs->packed);
return refs->packed;
}
static struct ref_dir *get_packed_ref_dir(struct packed_ref_cache *packed_ref_cache)
{
return get_ref_dir(packed_ref_cache->root);
}
static struct ref_dir *get_packed_refs(struct ref_cache *refs)
{
return get_packed_ref_dir(get_packed_ref_cache(refs));
}
void add_packed_ref(const char *refname, const unsigned char *sha1)