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@xxxxxxxxxxxx>
---
refs.c | 32 ++++++++++++++++++++++++++------
1 file changed, 26 insertions(+), 6 deletions(-)
diff --git a/refs.c b/refs.c
index 9f1a007..373d95b 100644
--- a/refs.c
+++ b/refs.c
@@ -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)
--
1.8.3.1
--
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