commit_ref_update(): new function, extracted from write_ref_sha1()

[thirdparty/git.git] / refs.c

diff --git a/refs.c b/refs.c
index 47e4e5380a1e0fc04f8b81837c51c023f35871cf..3db88e0b2ad09d826ae20909bfe3dc3502908885 100644 (file)
--- a/refs.c
+++ b/refs.c
@@ -3022,11 +3022,11 @@ int is_branch(const char *refname)
 }
 
 /*
- * Write sha1 into the ref specified by the lock. Make sure that errno
- * is sane on error.
+ * Write sha1 into the open lockfile, then close the lockfile. On
+ * errors, rollback the lockfile and set errno to reflect the problem.
  */
-static int write_ref_sha1(struct ref_lock *lock,
-       const unsigned char *sha1, const char *logmsg)
+static int write_ref_to_lockfile(struct ref_lock *lock,
+                                const unsigned char *sha1)
 {
        static char term = '\n';
        struct object *o;
@@ -3055,6 +3055,17 @@ static int write_ref_sha1(struct ref_lock *lock,
                errno = save_errno;
                return -1;
        }
+       return 0;
+}
+
+/*
+ * Commit a change to a loose reference that has already been written
+ * to the loose reference lockfile. Also update the reflogs if
+ * necessary, using the specified lockmsg (which can be NULL).
+ */
+static int commit_ref_update(struct ref_lock *lock,
+                            const unsigned char *sha1, const char *logmsg)
+{
        clear_loose_ref_cache(&ref_cache);
        if (log_ref_write(lock->ref_name, lock->old_sha1, sha1, logmsg) < 0 ||
            (strcmp(lock->ref_name, lock->orig_ref_name) &&
@@ -3093,6 +3104,21 @@ static int write_ref_sha1(struct ref_lock *lock,
        return 0;
 }
 
+/*
+ * Write sha1 as the new value of the reference specified by the
+ * (open) lock. On error, roll back the lockfile and set errno
+ * appropriately.
+ */
+static int write_ref_sha1(struct ref_lock *lock,
+                         const unsigned char *sha1, const char *logmsg)
+{
+       if (write_ref_to_lockfile(lock, sha1) ||
+           commit_ref_update(lock, sha1, logmsg))
+               return -1;
+
+       return 0;
+}
+
 int create_symref(const char *ref_target, const char *refs_heads_master,
                  const char *logmsg)
 {