transaction: rename lock() to lock_ref()

This leaves space for future expansion to locking other resources
without having to change the API for references.

include/git2/transaction.h

@@ -32,7 +32,7 @@ GIT_EXTERN(int) git_transaction_new(git_transaction **out, git_repository *repo)
  * @param refname the reference to lock
  * @return 0 or an error message
  */
-GIT_EXTERN(int) git_transaction_lock(git_transaction *tx, const char *refname);
+GIT_EXTERN(int) git_transaction_lock_ref(git_transaction *tx, const char *refname);
 
 /**
  * Set the target of a reference

src/stash.c

@@ -611,7 +611,7 @@ int git_stash_drop(
 	if ((error = git_transaction_new(&tx, repo)) < 0)
 		return error;
 
-	if ((error = git_transaction_lock(tx, GIT_REFS_STASH_FILE)) < 0)
+	if ((error = git_transaction_lock_ref(tx, GIT_REFS_STASH_FILE)) < 0)
 		goto cleanup;
 
 	if ((error = git_reference_lookup(&stash, repo, GIT_REFS_STASH_FILE)) < 0)

src/transaction.c

@@ -80,7 +80,7 @@ on_error:
 	return error;
 }
 
-int git_transaction_lock(git_transaction *tx, const char *refname)
+int git_transaction_lock_ref(git_transaction *tx, const char *refname)
 {
 	int error;
 	transaction_node *node;

tests/refs/transactions.c

@@ -23,7 +23,7 @@ void test_refs_transactions__single_ref_oid(void)
 
 	git_oid_fromstr(&id, "a65fedf39aefe402d3bb6e24df4d4f5fe4547750");
 
-	cl_git_pass(git_transaction_lock(g_tx, "refs/heads/master"));
+	cl_git_pass(git_transaction_lock_ref(g_tx, "refs/heads/master"));
 	cl_git_pass(git_transaction_set_target(g_tx, "refs/heads/master", &id, NULL, NULL));
 	cl_git_pass(git_transaction_commit(g_tx));
 
@@ -37,7 +37,7 @@ void test_refs_transactions__single_ref_symbolic(void)
 {
 	git_reference *ref;
 
-	cl_git_pass(git_transaction_lock(g_tx, "HEAD"));
+	cl_git_pass(git_transaction_lock_ref(g_tx, "HEAD"));
 	cl_git_pass(git_transaction_set_symbolic_target(g_tx, "HEAD", "refs/heads/foo", NULL, NULL));
 	cl_git_pass(git_transaction_commit(g_tx));
 
@@ -54,8 +54,8 @@ void test_refs_transactions__single_ref_mix_types(void)
 
 	git_oid_fromstr(&id, "a65fedf39aefe402d3bb6e24df4d4f5fe4547750");
 
-	cl_git_pass(git_transaction_lock(g_tx, "refs/heads/master"));
-	cl_git_pass(git_transaction_lock(g_tx, "HEAD"));
+	cl_git_pass(git_transaction_lock_ref(g_tx, "refs/heads/master"));
+	cl_git_pass(git_transaction_lock_ref(g_tx, "HEAD"));
 	cl_git_pass(git_transaction_set_symbolic_target(g_tx, "refs/heads/master", "refs/heads/foo", NULL, NULL));
 	cl_git_pass(git_transaction_set_target(g_tx, "HEAD", &id, NULL, NULL));
 	cl_git_pass(git_transaction_commit(g_tx));
@@ -73,7 +73,7 @@ void test_refs_transactions__single_ref_delete(void)
 {
 	git_reference *ref;
 
-	cl_git_pass(git_transaction_lock(g_tx, "refs/heads/master"));
+	cl_git_pass(git_transaction_lock_ref(g_tx, "refs/heads/master"));
 	cl_git_pass(git_transaction_remove(g_tx, "refs/heads/master"));
 	cl_git_pass(git_transaction_commit(g_tx));
 
@@ -88,7 +88,7 @@ void test_refs_transactions__single_create(void)
 
 	cl_git_fail_with(GIT_ENOTFOUND, git_reference_lookup(&ref, g_repo, name));
 
-	cl_git_pass(git_transaction_lock(g_tx, name));
+	cl_git_pass(git_transaction_lock_ref(g_tx, name));
 
 	git_oid_fromstr(&id, "a65fedf39aefe402d3bb6e24df4d4f5fe4547750");
 	cl_git_pass(git_transaction_set_target(g_tx, name, &id, NULL, NULL));
@@ -103,7 +103,7 @@ void test_refs_transactions__unlocked_set(void)
 {
 	git_oid id;
 
-	cl_git_pass(git_transaction_lock(g_tx, "refs/heads/master"));
+	cl_git_pass(git_transaction_lock_ref(g_tx, "refs/heads/master"));
 	git_oid_fromstr(&id, "a65fedf39aefe402d3bb6e24df4d4f5fe4547750");
 	cl_git_fail_with(GIT_ENOTFOUND, git_transaction_set_target(g_tx, "refs/heads/foo", &id, NULL, NULL));
 	cl_git_pass(git_transaction_commit(g_tx));