Merge pull request #3887 from libgit2/ethomson/empty_blob

odb: only provide the empty tree

src/odb.c

@@ -54,14 +54,9 @@ static int load_alternates(git_odb *odb, const char *objects_dir, int alternate_
 
 static git_otype odb_hardcoded_type(const git_oid *id)
 {
-	static git_oid empty_blob = {{ 0xe6, 0x9d, 0xe2, 0x9b, 0xb2, 0xd1, 0xd6, 0x43, 0x4b, 0x8b,
-					   0x29, 0xae, 0x77, 0x5a, 0xd8, 0xc2, 0xe4, 0x8c, 0x53, 0x91 }};
 	static git_oid empty_tree = {{ 0x4b, 0x82, 0x5d, 0xc6, 0x42, 0xcb, 0x6e, 0xb9, 0xa0, 0x60,
 					   0xe5, 0x4b, 0xf8, 0xd6, 0x92, 0x88, 0xfb, 0xee, 0x49, 0x04 }};
 
-	if (!git_oid_cmp(id, &empty_blob))
-		return GIT_OBJ_BLOB;
-
 	if (!git_oid_cmp(id, &empty_tree))
 		return GIT_OBJ_TREE;
 

tests/index/collision.c

@@ -2,105 +2,103 @@
 #include "git2/repository.h"
 #include "git2/index.h"
 
-git_repository *repo = NULL;
+static git_repository *g_repo;
+static git_odb *g_odb;
+static git_index *g_index;
+static git_oid g_empty_id;
+
+void test_index_collision__initialize(void)
+{
+	g_repo = cl_git_sandbox_init("empty_standard_repo");
+	cl_git_pass(git_repository_odb(&g_odb, g_repo));
+	cl_git_pass(git_repository_index(&g_index, g_repo));
+
+	cl_git_pass(git_odb_write(&g_empty_id, g_odb, "", 0, GIT_OBJ_BLOB));
+}
 
 void test_index_collision__cleanup(void)
 {
+	git_index_free(g_index);
+	git_odb_free(g_odb);
 	cl_git_sandbox_cleanup();
-	repo = NULL;
 }
 
 void test_index_collision__add(void)
 {
-	git_index *index;
 	git_index_entry entry;
 	git_oid tree_id;
 	git_tree *tree;
 
-	repo = cl_git_sandbox_init("empty_standard_repo");
-	cl_git_pass(git_repository_index(&index, repo));
-
 	memset(&entry, 0, sizeof(entry));
 	entry.ctime.seconds = 12346789;
 	entry.mtime.seconds = 12346789;
 	entry.mode  = 0100644;
 	entry.file_size = 0;
-	git_oid_fromstr(&entry.id, "e69de29bb2d1d6434b8b29ae775ad8c2e48c5391");
+	git_oid_cpy(&entry.id, &g_empty_id);
 
 	entry.path = "a/b";
-	cl_git_pass(git_index_add(index, &entry));
+	cl_git_pass(git_index_add(g_index, &entry));
 
 	/* create a tree/blob collision */
 	entry.path = "a/b/c";
-	cl_git_fail(git_index_add(index, &entry));
+	cl_git_fail(git_index_add(g_index, &entry));
 
-	cl_git_pass(git_index_write_tree(&tree_id, index));
-	cl_git_pass(git_tree_lookup(&tree, repo, &tree_id));
+	cl_git_pass(git_index_write_tree(&tree_id, g_index));
+	cl_git_pass(git_tree_lookup(&tree, g_repo, &tree_id));
 
 	git_tree_free(tree);
-	git_index_free(index);
 }
 
 void test_index_collision__add_with_highstage_1(void)
 {
-	git_index *index;
 	git_index_entry entry;
 
-	repo = cl_git_sandbox_init("empty_standard_repo");
-	cl_git_pass(git_repository_index(&index, repo));
-
 	memset(&entry, 0, sizeof(entry));
 	entry.ctime.seconds = 12346789;
 	entry.mtime.seconds = 12346789;
 	entry.mode  = 0100644;
 	entry.file_size = 0;
-	git_oid_fromstr(&entry.id, "e69de29bb2d1d6434b8b29ae775ad8c2e48c5391");
+	git_oid_cpy(&entry.id, &g_empty_id);
 
 	entry.path = "a/b";
 	GIT_IDXENTRY_STAGE_SET(&entry, 2);
-	cl_git_pass(git_index_add(index, &entry));
+	cl_git_pass(git_index_add(g_index, &entry));
 
 	/* create a blob beneath the previous tree entry */
 	entry.path = "a/b/c";
 	entry.flags = 0;
-	cl_git_pass(git_index_add(index, &entry));
+	cl_git_pass(git_index_add(g_index, &entry));
 
 	/* create another tree entry above the blob */
 	entry.path = "a/b";
 	GIT_IDXENTRY_STAGE_SET(&entry, 1);
-	cl_git_pass(git_index_add(index, &entry));
-
-	git_index_free(index);
+	cl_git_pass(git_index_add(g_index, &entry));
 }
 
 void test_index_collision__add_with_highstage_2(void)
 {
-	git_index *index;
 	git_index_entry entry;
 
-	repo = cl_git_sandbox_init("empty_standard_repo");
-	cl_git_pass(git_repository_index(&index, repo));
+	cl_git_pass(git_repository_index(&g_index, g_repo));
 
 	memset(&entry, 0, sizeof(entry));
 	entry.ctime.seconds = 12346789;
 	entry.mtime.seconds = 12346789;
 	entry.mode  = 0100644;
 	entry.file_size = 0;
-	git_oid_fromstr(&entry.id, "e69de29bb2d1d6434b8b29ae775ad8c2e48c5391");
+	git_oid_cpy(&entry.id, &g_empty_id);
 
 	entry.path = "a/b/c";
 	GIT_IDXENTRY_STAGE_SET(&entry, 1);
-	cl_git_pass(git_index_add(index, &entry));
+	cl_git_pass(git_index_add(g_index, &entry));
 
 	/* create a blob beneath the previous tree entry */
 	entry.path = "a/b/c";
 	GIT_IDXENTRY_STAGE_SET(&entry, 2);
-	cl_git_pass(git_index_add(index, &entry));
+	cl_git_pass(git_index_add(g_index, &entry));
 
 	/* create another tree entry above the blob */
 	entry.path = "a/b";
 	GIT_IDXENTRY_STAGE_SET(&entry, 3);
-	cl_git_pass(git_index_add(index, &entry));
-
-	git_index_free(index);
+	cl_git_pass(git_index_add(g_index, &entry));
 }

tests/odb/emptyobjects.c

@@ -2,29 +2,33 @@
 #include "odb.h"
 #include "filebuf.h"
 
+#define TEST_REPO_PATH "redundant.git"
+
 git_repository *g_repo;
+git_odb *g_odb;
 
 void test_odb_emptyobjects__initialize(void)
 {
-	cl_git_pass(git_repository_open(&g_repo, cl_fixture("testrepo.git")));
+	g_repo = cl_git_sandbox_init(TEST_REPO_PATH);
+	cl_git_pass(git_repository_odb(&g_odb, g_repo));
 }
+
 void test_odb_emptyobjects__cleanup(void)
 {
-	git_repository_free(g_repo);
+	git_odb_free(g_odb);
+	cl_git_sandbox_cleanup();
 }
 
-void test_odb_emptyobjects__read(void)
+void test_odb_emptyobjects__blob_notfound(void)
 {
-	git_oid id;
+	git_oid id, written_id;
 	git_blob *blob;
 
 	cl_git_pass(git_oid_fromstr(&id, "e69de29bb2d1d6434b8b29ae775ad8c2e48c5391"));
-	cl_git_pass(git_blob_lookup(&blob, g_repo, &id));
-	cl_assert_equal_i(GIT_OBJ_BLOB, git_object_type((git_object *) blob));
-	cl_assert(git_blob_rawcontent(blob));
-	cl_assert_equal_s("", git_blob_rawcontent(blob));
-	cl_assert_equal_i(0, git_blob_rawsize(blob));
-	git_blob_free(blob);
+	cl_git_fail_with(GIT_ENOTFOUND, git_blob_lookup(&blob, g_repo, &id));
+
+	cl_git_pass(git_odb_write(&written_id, g_odb, "", 0, GIT_OBJ_BLOB));
+	cl_assert(git_path_exists(TEST_REPO_PATH "/objects/e6/9de29bb2d1d6434b8b29ae775ad8c2e48c5391"));
 }
 
 void test_odb_emptyobjects__read_tree(void)
@@ -43,15 +47,12 @@ void test_odb_emptyobjects__read_tree(void)
 void test_odb_emptyobjects__read_tree_odb(void)
 {
 	git_oid id;
-	git_odb *odb;
 	git_odb_object *tree_odb;
 
 	cl_git_pass(git_oid_fromstr(&id, "4b825dc642cb6eb9a060e54bf8d69288fbee4904"));
-	cl_git_pass(git_repository_odb(&odb, g_repo));
-	cl_git_pass(git_odb_read(&tree_odb, odb, &id));
+	cl_git_pass(git_odb_read(&tree_odb, g_odb, &id));
 	cl_assert(git_odb_object_data(tree_odb));
 	cl_assert_equal_s("", git_odb_object_data(tree_odb));
 	cl_assert_equal_i(0, git_odb_object_size(tree_odb));
 	git_odb_object_free(tree_odb);
-	git_odb_free(odb);
 }

tests/reset/hard.c

@@ -240,14 +240,18 @@ void test_reset_hard__switch_file_to_dir(void)
 {
 	git_index_entry entry = {{ 0 }};
 	git_index *idx;
+	git_odb *odb;
 	git_object *commit;
 	git_tree *tree;
 	git_signature *sig;
 	git_oid src_tree_id, tgt_tree_id;
 	git_oid src_id, tgt_id;
 
+	cl_git_pass(git_repository_odb(&odb, repo));
+	cl_git_pass(git_odb_write(&entry.id, odb, "", 0, GIT_OBJ_BLOB));
+	git_odb_free(odb);
+
 	entry.mode = GIT_FILEMODE_BLOB;
-	cl_git_pass(git_oid_fromstr(&entry.id, "e69de29bb2d1d6434b8b29ae775ad8c2e48c5391"));
 	cl_git_pass(git_index_new(&idx));
 	cl_git_pass(git_signature_now(&sig, "foo", "bar"));