[PATCH v12 31/41] refs.c: make prune_ref use a transaction to delete the ref

From

Ronnie Sahlberg <sahlberg@google.com>

Date

May 29, 2014, 16:07 UTC

Message-ID

<1401379676-9307-8-git-send-email-sahlberg@google.com>

In-Reply-To

<1401379676-9307-1-git-send-email-sahlberg@google.com>

Signed-off-by: Ronnie Sahlberg <sahlberg@google.com>
---
 refs.c | 28 +++++++++++++++++++++-------
 refs.h | 11 ++++++++++-
 2 files changed, 31 insertions(+), 8 deletions(-)

diff --git a/refs.c b/refs.c
index 7cea694..60593d7 100644
--- a/refs.c
+++ b/refs.c
@@ -30,6 +30,12 @@ static inline int bad_ref_char(int ch)
 }
 
 /*
+ * Used as a flag to ref_transaction_delete when a loose ref is being
+ * pruned.
+ */
+#define REF_ISPRUNING	0x0100
+
+/*
  * Try to read one refname component from the front of refname.  Return
  * the length of the component found, or -1 if the component is not
  * legal.
@@ -2328,17 +2334,24 @@ static void try_remove_empty_parents(char *name)
 /* make sure nobody touched the ref, and unlink */
 static void prune_ref(struct ref_to_prune *r)
 {
-	struct ref_lock *lock;
+	struct ref_transaction *transaction;
+	struct strbuf err = STRBUF_INIT;
 
 	if (check_refname_format(r->name + 5, 0))
 		return;
 
-	lock = lock_ref_sha1_basic(r->name, r->sha1, 0, NULL);
-	if (lock) {
-		unlink_or_warn(git_path("%s", r->name));
-		unlock_ref(lock);
-		try_remove_empty_parents(r->name);
+	transaction = ref_transaction_begin(&err);
+	if (!transaction ||
+	    ref_transaction_delete(transaction, r->name, r->sha1,
+				   REF_ISPRUNING, 1, &err) ||
+	    ref_transaction_commit(transaction, NULL, &err)) {
+		ref_transaction_free(transaction);
+		error("%s", err.buf);
+		strbuf_release(&err);
+		return;
 	}
+	ref_transaction_free(transaction);
+	try_remove_empty_parents(r->name);
 }
 
 static void prune_refs(struct ref_to_prune *r)
@@ -3536,9 +3549,10 @@ int ref_transaction_commit(struct ref_transaction *transaction,
 		struct ref_update *update = updates[i];
 
 		if (update->lock) {
-			delnames[delnum++] = update->lock->ref_name;
 			ret |= delete_ref_loose(update->lock, update->type,
 						err);
+			if (!(update->flags & REF_ISPRUNING))
+				delnames[delnum++] = update->lock->ref_name;
 		}
 	}
 
diff --git a/refs.h b/refs.h
index c38ee09..dee7c8f 100644
--- a/refs.h
+++ b/refs.h
@@ -171,8 +171,17 @@ extern int ref_exists(const char *);
  */
 extern int peel_ref(const char *refname, unsigned char *sha1);
 
-/** Locks any ref (for 'HEAD' type refs). */
+/*
+ * Flags controlling lock_any_ref_for_update(), ref_transaction_update(),
+ * ref_transaction_create(), etc.
+ * REF_NODEREF: act on the ref directly, instead of dereferencing
+ *              symbolic references.
+ *
+ * Flags >= 0x100 are reserved for internal use.
+ */
 #define REF_NODEREF	0x01
+
+/** Locks any ref (for 'HEAD' type refs). */
 extern struct ref_lock *lock_any_ref_for_update(const char *refname,
 						const unsigned char *old_sha1,
 						int flags, int *type_p);

-- 
2.0.0.rc3.474.g3833130