credential/libsecret: erase matching creds only

The credential erase request typically includes protocol, host, username
and password.

credential-libsecret erases a stored credential if it matches protocol,
host and username, regardless of password.

This is confusing in the case the stored password differs from that
in the request. This case can occur when multiple credential helpers are
configured.

Only erase credential if stored password matches request (or request
omits password).

This fixes test "helper (libsecret) does not erase a password distinct
from input" when t0303 is run with GIT_TEST_CREDENTIAL_HELPER set to
"libsecret". This test was added in aeb21ce (credential: avoid
erasing distinct password, 2023-06-13).

Signed-off-by: M Hickford <mirth.hickford@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

contrib/credential/libsecret/git-credential-libsecret.c

@@ -52,6 +52,8 @@ struct credential_operation {
 
 #define CREDENTIAL_OP_END { NULL, NULL }
 
+static void credential_clear(struct credential *c);
+
 /* ----------------- Secret Service functions ----------------- */
 
 static char *make_label(struct credential *c)
@@ -185,6 +187,7 @@ static int keyring_erase(struct credential *c)
 {
 	GHashTable *attributes = NULL;
 	GError *error = NULL;
+	struct credential existing = CREDENTIAL_INIT;
 
 	/*
 	 * Sanity check that we actually have something to match
@@ -197,6 +200,20 @@ static int keyring_erase(struct credential *c)
 	if (!c->protocol && !c->host && !c->path && !c->username)
 		return EXIT_FAILURE;
 
+	if (c->password) {
+		existing.host = g_strdup(c->host);
+		existing.path = g_strdup(c->path);
+		existing.port = c->port;
+		existing.protocol = g_strdup(c->protocol);
+		existing.username = g_strdup(c->username);
+		keyring_get(&existing);
+		if (existing.password && strcmp(c->password, existing.password)) {
+			credential_clear(&existing);
+			return EXIT_SUCCESS;
+		}
+		credential_clear(&existing);
+	}
+
 	attributes = make_attr_list(c);
 	secret_password_clearv_sync(SECRET_SCHEMA_COMPAT_NETWORK,
 				    attributes,