Improve test failure output

include/git2/repository.h

@@ -657,6 +657,15 @@ GIT_EXTERN(int) git_repository_set_namespace(git_repository *repo, const char *n
  */
 GIT_EXTERN(const char *) git_repository_get_namespace(git_repository *repo);
 
+
+/**
+ * Determine if the repository was a shallow clone
+ *
+ * @param repo The repository
+ * @return 1 if shallow, zero if not
+ */
+GIT_EXTERN(int) git_repository_is_shallow(git_repository *repo);
+
 /** @} */
 GIT_END_DECL
 #endif

src/repository.c

@@ -1822,3 +1822,15 @@ int git_repository_state(git_repository *repo)
 	git_buf_free(&repo_path);
 	return state;
 }
+
+int git_repository_is_shallow(git_repository *repo)
+{
+	git_buf path = GIT_BUF_INIT;
+	struct stat st;
+
+	git_buf_joinpath(&path, repo->path_repository, "shallow");
+
+	if (git_path_lstat(path.ptr, &st) == GIT_ENOTFOUND)
+		return 0;
+	return st.st_size == 0 ? 0 : 1;
+}

tests-clar/repo/shallow.c

+#include "clar_libgit2.h"
+#include "fileops.h"
+
+static git_repository *g_repo;
+
+void test_repo_shallow__initialize(void)
+{
+}
+
+void test_repo_shallow__cleanup(void)
+{
+	cl_git_sandbox_cleanup();
+}
+
+void test_repo_shallow__no_shallow_file(void)
+{
+	g_repo = cl_git_sandbox_init("testrepo.git");
+	cl_assert_equal_i(0, git_repository_is_shallow(g_repo));
+}
+
+void test_repo_shallow__empty_shallow_file(void)
+{
+	g_repo = cl_git_sandbox_init("testrepo.git");
+	cl_git_mkfile("testrepo.git/shallow", "");
+	cl_assert_equal_i(0, git_repository_is_shallow(g_repo));
+}
+
+void test_repo_shallow__shallow_repo(void)
+{
+	g_repo = cl_git_sandbox_init("shallow.git");
+	cl_assert_equal_i(1, git_repository_is_shallow(g_repo));
+}
+

tests-clar/resources/shallow.git/HEAD

+ref: refs/heads/master

tests-clar/resources/shallow.git/config

+[core]
+	repositoryformatversion = 0
+	filemode = true
+	bare = true
+	ignorecase = true
+	precomposeunicode = false
+[remote "origin"]
+	url = file://testrepo.git

tests-clar/resources/shallow.git/packed-refs

+# pack-refs with: peeled 
+a65fedf39aefe402d3bb6e24df4d4f5fe4547750 refs/heads/master

tests-clar/resources/shallow.git/shallow

+be3563ae3f795b2b4353bcce3a527ad0a4f7f644