Merge pull request libgit2#1141 from ben/clone-empty-repo

Allow clone to handle empty repos

examples/.gitignore

@@ -1,2 +1,4 @@
 general
 showindex
+diff
+*.dSYM

examples/network/Makefile

@@ -14,3 +14,7 @@ OBJECTS = \
 
 all: $(OBJECTS)
 	$(CC) $(CFLAGS) $(LDFLAGS) -o git2 $(OBJECTS)
+
+clean:
+	$(RM) $(OBJECTS)
+	$(RM) git2

src/transports/local.c

@@ -42,17 +42,25 @@ static int add_ref(transport_local *t, const char *name)
 	git_remote_head *head;
 	git_object *obj = NULL, *target = NULL;
 	git_buf buf = GIT_BUF_INIT;
+	int error;
 
 	head = git__calloc(1, sizeof(git_remote_head));
 	GITERR_CHECK_ALLOC(head);
 
 	head->name = git__strdup(name);
 	GITERR_CHECK_ALLOC(head->name);
 
-	if (git_reference_name_to_id(&head->oid, t->repo, name) < 0) {
+	error = git_reference_name_to_id(&head->oid, t->repo, name);
+	if (error < 0) {
 		git__free(head->name);
 		git__free(head);
-		return -1;
+		if (!strcmp(name, GIT_HEAD_FILE) && error == GIT_ENOTFOUND) {
+			/* This is actually okay.  Empty repos often have a HEAD that points to
+			 * a nonexistent "refs/heads/master". */
+			giterr_clear();
+			return 0;
+		}
+		return error;
 	}
 
 	if (git_vector_insert(&t->refs, head) < 0)

tests-clar/clone/empty.c

@@ -0,0 +1,67 @@
+#include "clar_libgit2.h"
+
+#include "git2/clone.h"
+#include "repository.h"
+
+static git_clone_options g_options;
+static git_remote *g_origin;
+static git_repository *g_repo;
+
+void test_clone_empty__initialize(void)
+{
+	git_repository *sandbox = cl_git_sandbox_init("empty_bare.git");
+	cl_git_remove_placeholders(git_repository_path(sandbox), "dummy-marker.txt");
+
+	g_repo = NULL;
+
+	memset(&g_options, 0, sizeof(git_clone_options));
+	g_options.version = GIT_CLONE_OPTIONS_VERSION;
+	cl_git_pass(git_remote_new(&g_origin, NULL, "origin", cl_git_fixture_url("testrepo.git"), GIT_REMOTE_DEFAULT_FETCH));
+}
+
+void test_clone_empty__cleanup(void)
+{
+	git_remote_free(g_origin);
+	cl_git_sandbox_cleanup();
+}
+
+static void cleanup_repository(void *path)
+{
+	cl_fixture_cleanup((const char *)path);
+}
+
+void test_clone_empty__can_clone_an_empty_local_repo_barely(void)
+{
+	cl_set_cleanup(&cleanup_repository, "./empty");
+
+	git_remote_free(g_origin);
+	cl_git_pass(git_remote_new(&g_origin, NULL, "origin", "./empty_bare.git", GIT_REMOTE_DEFAULT_FETCH));
+
+	g_options.bare = true;
+	cl_git_pass(git_clone(&g_repo, g_origin, "./empty", &g_options));
+}
+
+void test_clone_empty__can_clone_an_empty_local_repo(void)
+{
+	cl_set_cleanup(&cleanup_repository, "./empty");
+
+	git_remote_free(g_origin);
+	cl_git_pass(git_remote_new(&g_origin, NULL, "origin", "./empty_bare.git", GIT_REMOTE_DEFAULT_FETCH));
+
+	cl_git_pass(git_clone(&g_repo, g_origin, "./empty", &g_options));
+}
+
+void test_clone_empty__can_clone_an_empty_standard_repo(void)
+{
+	cl_git_sandbox_cleanup();
+	g_repo = cl_git_sandbox_init("empty_standard_repo");
+	cl_git_remove_placeholders(git_repository_path(g_repo), "dummy-marker.txt");
+	git_repository_free(g_repo);
+
+	git_remote_free(g_origin);
+	cl_git_pass(git_remote_new(&g_origin, NULL, "origin", "./empty_standard_repo", GIT_REMOTE_DEFAULT_FETCH));
+
+	cl_set_cleanup(&cleanup_repository, "./empty");
+
+	cl_git_pass(git_clone(&g_repo, g_origin, "./empty", &g_options));
+}

tests-clar/fetchhead/network.c

@@ -63,8 +63,7 @@ static void fetchhead_test_fetch(const char *fetchspec, const char *expected_fet
 	git_remote_disconnect(remote);
 	git_remote_free(remote);
 
-	cl_git_pass(git_futils_readbuffer(&fetchhead_buf,
-		"./test1/.git/FETCH_HEAD"));
+	cl_git_pass(git_futils_readbuffer(&fetchhead_buf, "./foo/.git/FETCH_HEAD"));
 
 	equals = (strcmp(fetchhead_buf.ptr, expected_fetchhead) == 0);
 

tests-clar/network/push.c

@@ -211,6 +211,10 @@ void test_network_push__cleanup(void)
 {
 	if (_remote)
 		git_remote_free(_remote);
+	_remote = NULL;
+
+	/* Freed by cl_git_sandbox_cleanup */
+	_repo = NULL;
 
 	record_callbacks_data_clear(&_record_cbs_data);