Merge pull request libgit2#4833 from csware/drop-empty-dirs

Remove empty (sub-)directories when deleting refs

Author: pks-t

src/refdb_fs.c

@@ -1313,6 +1313,43 @@ static int refdb_fs_backend__write_tail(
         return error;
 }
 
+static void refdb_fs_backend__try_delete_empty_ref_hierarchie(
+	refdb_fs_backend *backend,
+	const char *ref_name,
+	bool reflog)
+{
+	git_buf relative_path = GIT_BUF_INIT;
+	git_buf base_path = GIT_BUF_INIT;
+	size_t commonlen;
+
+	assert(backend && ref_name);
+
+	if (git_buf_sets(&relative_path, ref_name) < 0)
+		goto cleanup;
+
+	git_path_squash_slashes(&relative_path);
+	if ((commonlen = git_path_common_dirlen("refs/heads/", git_buf_cstr(&relative_path))) == strlen("refs/heads/") ||
+		(commonlen = git_path_common_dirlen("refs/tags/", git_buf_cstr(&relative_path))) == strlen("refs/tags/") ||
+		(commonlen = git_path_common_dirlen("refs/remotes/", git_buf_cstr(&relative_path))) == strlen("refs/remotes/")) {
+
+		git_buf_truncate(&relative_path, commonlen);
+
+		if (reflog) {
+			if (git_buf_join3(&base_path, '/', backend->commonpath, GIT_REFLOG_DIR, git_buf_cstr(&relative_path)) < 0)
+				goto cleanup;
+		} else {
+			if (git_buf_joinpath(&base_path, backend->commonpath, git_buf_cstr(&relative_path)) < 0)
+				goto cleanup;
+		}
+
+		git_futils_rmdir_r(ref_name + commonlen, git_buf_cstr(&base_path), GIT_RMDIR_EMPTY_PARENTS | GIT_RMDIR_SKIP_ROOT);
+	}
+
+cleanup:
+	git_buf_dispose(&relative_path);
+	git_buf_dispose(&base_path);
+}
+
 static int refdb_fs_backend__delete(
 	git_refdb_backend *_backend,
 	const char *ref_name,
@@ -1393,7 +1430,8 @@ static int refdb_fs_backend__delete_tail(
 cleanup:
 	git_buf_dispose(&loose_path);
 	git_filebuf_cleanup(file);
-
+	if (loose_deleted)
+		refdb_fs_backend__try_delete_empty_ref_hierarchie(backend, ref_name, false);
 	return error;
 }
 
@@ -2021,8 +2059,10 @@ static int refdb_reflog_fs__delete(git_refdb_backend *_backend, const char *name
 
 	error = retrieve_reflog_path(&path, repo, name);
 
-	if (!error && git_path_exists(path.ptr))
+	if (!error && git_path_exists(path.ptr)) {
 		error = p_unlink(path.ptr);
+		refdb_fs_backend__try_delete_empty_ref_hierarchie(backend, name, true);
+	}
 
 	git_buf_dispose(&path);
 

tests/refs/branches/delete.c

@@ -2,6 +2,8 @@
 #include "refs.h"
 #include "repo/repo_helpers.h"
 #include "config/config_helpers.h"
+#include "fileops.h"
+#include "reflog.h"
 
 static git_repository *repo;
 static git_reference *fake_remote;
@@ -140,3 +142,47 @@ void test_refs_branches_delete__removes_reflog(void)
 	git_reflog_free(log);
 }
 
+void test_refs_branches_delete__removes_empty_folders(void)
+{
+	const char *commondir = git_repository_commondir(repo);
+	git_oid commit_id;
+	git_commit *commit;
+	git_reference *branch;
+
+	git_reflog *log;
+	git_oid oidzero = {{0}};
+	git_signature *sig;
+
+	git_buf ref_folder = GIT_BUF_INIT;
+	git_buf reflog_folder = GIT_BUF_INIT;
+
+	/* Create a new branch with a nested name */
+	cl_git_pass(git_oid_fromstr(&commit_id, "a65fedf39aefe402d3bb6e24df4d4f5fe4547750"));
+	cl_git_pass(git_commit_lookup(&commit, repo, &commit_id));
+	cl_git_pass(git_branch_create(&branch, repo, "some/deep/ref", commit, 0));
+	git_commit_free(commit);
+
+	/* Ensure the reflog has at least one entry */
+	cl_git_pass(git_signature_now(&sig, "Me", "user@example.com"));
+	cl_git_pass(git_reflog_read(&log, repo, "refs/heads/some/deep/ref"));
+	cl_git_pass(git_reflog_append(log, &oidzero, sig, "message"));
+	cl_assert(git_reflog_entrycount(log) > 0);
+	git_signature_free(sig);
+	git_reflog_free(log);
+
+	cl_git_pass(git_buf_joinpath(&ref_folder, commondir, "refs/heads/some/deep"));
+	cl_git_pass(git_buf_join3(&reflog_folder, '/', commondir, GIT_REFLOG_DIR, "refs/heads/some/deep"));
+
+	cl_assert(git_path_exists(git_buf_cstr(&ref_folder)) == true);
+	cl_assert(git_path_exists(git_buf_cstr(&reflog_folder)) == true);
+
+	cl_git_pass(git_branch_delete(branch));
+
+	cl_assert(git_path_exists(git_buf_cstr(&ref_folder)) == false);
+	cl_assert(git_path_exists(git_buf_cstr(&reflog_folder)) == false);
+
+	git_reference_free(branch);
+	git_buf_dispose(&ref_folder);
+	git_buf_dispose(&reflog_folder);
+}
+