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-rw-r--r--refs.c20
1 files changed, 13 insertions, 7 deletions
diff --git a/refs.c b/refs.c
index 39a3b23804..b6807505e2 100644
--- a/refs.c
+++ b/refs.c
@@ -390,6 +390,18 @@ int resolve_gitlink_ref(const char *path, const char *refname, unsigned char *re
return retval;
}
+/*
+ * If the "reading" argument is set, this function finds out what _object_
+ * the ref points at by "reading" the ref. The ref, if it is not symbolic,
+ * has to exist, and if it is symbolic, it has to point at an existing ref,
+ * because the "read" goes through the symref to the ref it points at.
+ *
+ * The access that is not "reading" may often be "writing", but does not
+ * have to; it can be merely checking _where it leads to_. If it is a
+ * prelude to "writing" to the ref, a write to a symref that points at
+ * yet-to-be-born ref will create the real ref pointed by the symref.
+ * reading=0 allows the caller to check where such a symref leads to.
+ */
const char *resolve_ref(const char *ref, unsigned char *sha1, int reading, int *flag)
{
int depth = MAXDEPTH;
@@ -409,13 +421,7 @@ const char *resolve_ref(const char *ref, unsigned char *sha1, int reading, int *
if (--depth < 0)
return NULL;
- /* Special case: non-existing file.
- * Not having the refs/heads/new-branch is OK
- * if we are writing into it, so is .git/HEAD
- * that points at refs/heads/master still to be
- * born. It is NOT OK if we are resolving for
- * reading.
- */
+ /* Special case: non-existing file. */
if (lstat(path, &st) < 0) {
struct ref_list *list = get_packed_refs();
while (list) {