Introduce reference transactions

A transaction allows you to lock multiple references and set up changes
for them before applying the changes all at once (or as close as the
backend supports).

This can be used for replication purposes, or for making sure some
operations run when the reference is locked and thus cannot be changed.

1 files changed, 110 insertions, 0 deletions

diff --git a/tests/refs/transactions.c b/tests/refs/transactions.c
new file mode 100644
index 000000000..5284ea82b
--- /dev/null
+++ b/tests/refs/transactions.c
@@ -0,0 +1,110 @@
+#include "clar_libgit2.h"
+#include "git2/transaction.h"
+
+static git_repository *g_repo;
+static git_transaction *g_tx;
+
+void test_refs_transactions__initialize(void)
+{
+   g_repo = cl_git_sandbox_init("testrepo");
+   cl_git_pass(git_transaction_new(&g_tx, g_repo));
+}
+
+void test_refs_transactions__cleanup(void)
+{
+	git_transaction_free(g_tx);
+	cl_git_sandbox_cleanup();
+}
+
+void test_refs_transactions__single_ref_oid(void)
+{
+	git_reference *ref;
+	git_oid id;
+
+	git_oid_fromstr(&id, "a65fedf39aefe402d3bb6e24df4d4f5fe4547750");
+
+	cl_git_pass(git_transaction_lock(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));
+
+	cl_git_pass(git_reference_lookup(&ref, g_repo, "refs/heads/master"));
+
+	cl_assert(!git_oid_cmp(&id, git_reference_target(ref)));
+	git_reference_free(ref);
+}
+
+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_set_symbolic_target(g_tx, "HEAD", "refs/heads/foo", NULL, NULL));
+	cl_git_pass(git_transaction_commit(g_tx));
+
+	cl_git_pass(git_reference_lookup(&ref, g_repo, "HEAD"));
+
+	cl_assert_equal_s("refs/heads/foo", git_reference_symbolic_target(ref));
+	git_reference_free(ref);
+}
+
+void test_refs_transactions__single_ref_mix_types(void)
+{
+	git_reference *ref;
+	git_oid id;
+
+	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_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));
+
+	cl_git_pass(git_reference_lookup(&ref, g_repo, "refs/heads/master"));
+	cl_assert_equal_s("refs/heads/foo", git_reference_symbolic_target(ref));
+	git_reference_free(ref);
+
+	cl_git_pass(git_reference_lookup(&ref, g_repo, "HEAD"));
+	cl_assert(!git_oid_cmp(&id, git_reference_target(ref)));
+	git_reference_free(ref);
+}
+
+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_remove(g_tx, "refs/heads/master"));
+	cl_git_pass(git_transaction_commit(g_tx));
+
+	cl_git_fail_with(GIT_ENOTFOUND, git_reference_lookup(&ref, g_repo, "refs/heads/master"));
+}
+
+void test_refs_transactions__single_create(void)
+{
+	git_reference *ref;
+	const char *name = "refs/heads/new-branch";
+	git_oid id;
+
+	cl_git_fail_with(GIT_ENOTFOUND, git_reference_lookup(&ref, g_repo, name));
+
+	cl_git_pass(git_transaction_lock(g_tx, name));
+
+	git_oid_fromstr(&id, "a65fedf39aefe402d3bb6e24df4d4f5fe4547750");
+	cl_git_pass(git_transaction_set_target(g_tx, name, &id, NULL, NULL));
+	cl_git_pass(git_transaction_commit(g_tx));
+
+	cl_git_pass(git_reference_lookup(&ref, g_repo, name));
+	cl_assert(!git_oid_cmp(&id, git_reference_target(ref)));
+	git_reference_free(ref);
+}
+
+void test_refs_transactions__unlocked_set(void)
+{
+	git_oid id;
+
+	cl_git_pass(git_transaction_lock(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));
+}