Merge branch 'sqlite-backend'

3 files changed, 628 insertions, 0 deletions

diff --git a/src/backends/sqlite.c b/src/backends/sqlite.c
new file mode 100644
index 000000000..ad5b679f9
--- /dev/null
+++ b/src/backends/sqlite.c
@@ -0,0 +1,277 @@
+/*
+ * This file is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2,
+ * as published by the Free Software Foundation.
+ *
+ * In addition to the permissions in the GNU General Public License,
+ * the authors give you unlimited permission to link the compiled
+ * version of this file into combinations with other programs,
+ * and to distribute those combinations without any restriction
+ * coming from the use of this file.  (The General Public License
+ * restrictions do apply in other respects; for example, they cover
+ * modification of the file, and distribution when not linked into
+ * a combined executable.)
+ *
+ * This file is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.  If not, write to
+ * the Free Software Foundation, 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include "common.h"
+#include "git2/object.h"
+#include "hash.h"
+#include "odb.h"
+
+#include "git2/odb_backend.h"
+
+#ifdef GIT2_SQLITE_BACKEND
+
+#include <sqlite3.h>
+
+#define GIT2_TABLE_NAME "git2_odb"
+
+typedef struct {
+	git_odb_backend parent;
+	sqlite3 *db;
+	sqlite3_stmt *st_read;
+	sqlite3_stmt *st_write;
+	sqlite3_stmt *st_read_header;
+} sqlite_backend;
+
+int sqlite_backend__read_header(git_rawobj *obj, git_odb_backend *_backend, const git_oid *oid)
+{
+	sqlite_backend *backend;
+	int error;
+
+	assert(obj && _backend && oid);
+
+	backend = (sqlite_backend *)_backend;
+	error = GIT_ERROR;
+	obj->data = NULL;
+
+	if (sqlite3_bind_text(backend->st_read_header, 1, (char *)oid->id, 20, SQLITE_TRANSIENT) == SQLITE_OK) {
+		if (sqlite3_step(backend->st_read_header) == SQLITE_ROW) {
+			obj->type = sqlite3_column_int(backend->st_read_header, 0);
+			obj->len = sqlite3_column_int(backend->st_read_header, 1);
+			assert(sqlite3_step(backend->st_read_header) == SQLITE_DONE);
+			error = GIT_SUCCESS;
+		} else {
+			error = GIT_ENOTFOUND;
+		}
+	}
+
+	sqlite3_reset(backend->st_read_header);
+	return error;
+}
+
+
+int sqlite_backend__read(git_rawobj *obj, git_odb_backend *_backend, const git_oid *oid)
+{
+	sqlite_backend *backend;
+	int error;
+
+	assert(obj && _backend && oid);
+
+	backend = (sqlite_backend *)_backend;
+	error = GIT_ERROR;
+
+	if (sqlite3_bind_text(backend->st_read, 1, (char *)oid->id, 20, SQLITE_TRANSIENT) == SQLITE_OK) {
+		if (sqlite3_step(backend->st_read) == SQLITE_ROW) {
+			obj->type = sqlite3_column_int(backend->st_read, 0);
+			obj->len = sqlite3_column_int(backend->st_read, 1);
+			obj->data = git__malloc(obj->len);
+
+			if (obj->data == NULL) {
+				error = GIT_ENOMEM;
+			} else {
+				memcpy(obj->data, sqlite3_column_blob(backend->st_read, 2), obj->len);
+				error = GIT_SUCCESS;
+			}
+
+			assert(sqlite3_step(backend->st_read) == SQLITE_DONE);
+		} else {
+			error = GIT_ENOTFOUND;
+		}
+	}
+
+	sqlite3_reset(backend->st_read);
+	return error;
+}
+
+int sqlite_backend__exists(git_odb_backend *_backend, const git_oid *oid)
+{
+	sqlite_backend *backend;
+	int found;
+
+	assert(_backend && oid);
+
+	backend = (sqlite_backend *)_backend;
+	found = 0;
+
+	if (sqlite3_bind_text(backend->st_read_header, 1, (char *)oid->id, 20, SQLITE_TRANSIENT) == SQLITE_OK) {
+		if (sqlite3_step(backend->st_read_header) == SQLITE_ROW) {
+			found = 1;
+			assert(sqlite3_step(backend->st_read_header) == SQLITE_DONE);
+		}
+	}
+
+	sqlite3_reset(backend->st_read_header);
+	return found;
+}
+
+
+int sqlite_backend__write(git_oid *id, git_odb_backend *_backend, git_rawobj *obj)
+{
+	char hdr[64];
+	int  hdrlen;
+
+	int error;
+	sqlite_backend *backend;
+
+	assert(id && _backend && obj);
+
+	backend = (sqlite_backend *)_backend;
+
+	if ((error = git_odb__hash_obj(id, hdr, sizeof(hdr), &hdrlen, obj)) < 0)
+		return error;
+
+	error = SQLITE_ERROR;
+
+	if (sqlite3_bind_text(backend->st_write, 1, (char *)id->id, 20, SQLITE_TRANSIENT) == SQLITE_OK &&
+		sqlite3_bind_int(backend->st_write, 2, (int)obj->type) == SQLITE_OK &&
+		sqlite3_bind_int(backend->st_write, 3, obj->len) == SQLITE_OK &&
+		sqlite3_bind_blob(backend->st_write, 4, obj->data, obj->len, SQLITE_TRANSIENT) == SQLITE_OK) {
+		error = sqlite3_step(backend->st_write);
+	}
+
+	sqlite3_reset(backend->st_write);
+	return (error == SQLITE_DONE) ? GIT_SUCCESS : GIT_ERROR;
+}
+
+
+void sqlite_backend__free(git_odb_backend *_backend)
+{
+	sqlite_backend *backend;
+	assert(_backend);
+	backend = (sqlite_backend *)_backend;
+
+	sqlite3_finalize(backend->st_read);
+	sqlite3_finalize(backend->st_read_header);
+	sqlite3_finalize(backend->st_write);
+	sqlite3_close(backend->db);
+
+	free(backend);
+}
+
+static int create_table(sqlite3 *db)
+{
+	static const char *sql_creat =
+		"CREATE TABLE '" GIT2_TABLE_NAME "' ("
+		"'oid' CHARACTER(20) PRIMARY KEY NOT NULL,"
+		"'type' INTEGER NOT NULL,"
+		"'size' INTEGER NOT NULL,"
+		"'data' BLOB);";
+
+	if (sqlite3_exec(db, sql_creat, NULL, NULL, NULL) != SQLITE_OK)
+		return GIT_ERROR;
+
+	return GIT_SUCCESS;
+}
+
+static int init_db(sqlite3 *db)
+{
+	static const char *sql_check =
+		"SELECT name FROM sqlite_master WHERE type='table' AND name='" GIT2_TABLE_NAME "';";
+
+	sqlite3_stmt *st_check;
+	int error;
+
+	if (sqlite3_prepare_v2(db, sql_check, -1, &st_check, NULL) != SQLITE_OK)
+		return GIT_ERROR;
+
+	switch (sqlite3_step(st_check)) {
+	case SQLITE_DONE:
+		/* the table was not found */
+		error = create_table(db);
+		break;
+
+	case SQLITE_ROW:
+		/* the table was found */
+		error = GIT_SUCCESS;
+		break;
+
+	default:
+		error = GIT_ERROR;
+		break;
+	}
+
+	sqlite3_finalize(st_check);
+	return error;
+}
+
+static int init_statements(sqlite_backend *backend)
+{
+	static const char *sql_read =
+		"SELECT type, size, data FROM '" GIT2_TABLE_NAME "' WHERE oid = ?;";
+
+	static const char *sql_read_header =
+		"SELECT type, size FROM '" GIT2_TABLE_NAME "' WHERE oid = ?;";
+
+	static const char *sql_write =
+		"INSERT OR IGNORE INTO '" GIT2_TABLE_NAME "' VALUES (?, ?, ?, ?);";
+
+	if (sqlite3_prepare_v2(backend->db, sql_read, -1, &backend->st_read, NULL) != SQLITE_OK)
+		return GIT_ERROR;
+
+	if (sqlite3_prepare_v2(backend->db, sql_read_header, -1, &backend->st_read_header, NULL) != SQLITE_OK)
+		return GIT_ERROR;
+
+	if (sqlite3_prepare_v2(backend->db, sql_write, -1, &backend->st_write, NULL) != SQLITE_OK)
+		return GIT_ERROR;
+
+	return GIT_SUCCESS;
+}
+
+int git_odb_backend_sqlite(git_odb_backend **backend_out, const char *sqlite_db)
+{
+	sqlite_backend *backend;
+	int error;
+
+	backend = git__calloc(1, sizeof(sqlite_backend));
+	if (backend == NULL)
+		return GIT_ENOMEM;
+
+	if (sqlite3_open(sqlite_db, &backend->db) != SQLITE_OK)
+		goto cleanup;
+
+	error = init_db(backend->db);
+	if (error < 0)
+		goto cleanup;
+
+	error = init_statements(backend);
+	if (error < 0)
+		goto cleanup;
+
+	backend->parent.read = &sqlite_backend__read;
+	backend->parent.read_header = &sqlite_backend__read_header;
+	backend->parent.write = &sqlite_backend__write;
+	backend->parent.exists = &sqlite_backend__exists;
+	backend->parent.free = &sqlite_backend__free;
+
+	backend->parent.priority = 0; 
+
+	*backend_out = (git_odb_backend *)backend;
+	return GIT_SUCCESS;
+
+cleanup:
+	sqlite_backend__free((git_odb_backend *)backend);
+	return GIT_ERROR;
+}
+
+#endif /* HAVE_SQLITE3 */
diff --git a/src/git2/odb_backend.h b/src/git2/odb_backend.h
index 9c0c3ad6f..ee7e5dfde 100644
--- a/src/git2/odb_backend.h
+++ b/src/git2/odb_backend.h
@@ -66,6 +66,13 @@ struct git_odb_backend {
 	void (* free)(struct git_odb_backend *);
 };
 
+GIT_EXTERN(int) git_odb_backend_pack(git_odb_backend **backend_out, const char *objects_dir);
+GIT_EXTERN(int) git_odb_backend_loose(git_odb_backend **backend_out, const char *objects_dir);
+
+#ifdef GIT2_SQLITE_BACKEND
+GIT_EXTERN(int) git_odb_backend_sqlite(git_odb_backend **backend_out, const char *sqlite_db);
+#endif
+
 GIT_END_DECL
 
 #endif
diff --git a/src/t03-data.h b/src/t03-data.h
new file mode 100644
index 000000000..a4b73fec3
--- /dev/null
+++ b/src/t03-data.h
@@ -0,0 +1,344 @@
+
+typedef struct object_data {
+    char *id;     /* object id (sha1)                          */
+    char *dir;    /* object store (fan-out) directory name     */
+    char *file;   /* object store filename                     */
+} object_data;
+
+static object_data commit = {
+    "3d7f8a6af076c8c3f20071a8935cdbe8228594d1",
+    "test-objects/3d",
+    "test-objects/3d/7f8a6af076c8c3f20071a8935cdbe8228594d1",
+};
+
+static unsigned char commit_data[] = {
+    0x74, 0x72, 0x65, 0x65, 0x20, 0x64, 0x66, 0x66,
+    0x32, 0x64, 0x61, 0x39, 0x30, 0x62, 0x32, 0x35,
+    0x34, 0x65, 0x31, 0x62, 0x65, 0x62, 0x38, 0x38,
+    0x39, 0x64, 0x31, 0x66, 0x31, 0x66, 0x31, 0x32,
+    0x38, 0x38, 0x62, 0x65, 0x31, 0x38, 0x30, 0x33,
+    0x37, 0x38, 0x32, 0x64, 0x66, 0x0a, 0x61, 0x75,
+    0x74, 0x68, 0x6f, 0x72, 0x20, 0x41, 0x20, 0x55,
+    0x20, 0x54, 0x68, 0x6f, 0x72, 0x20, 0x3c, 0x61,
+    0x75, 0x74, 0x68, 0x6f, 0x72, 0x40, 0x65, 0x78,
+    0x61, 0x6d, 0x70, 0x6c, 0x65, 0x2e, 0x63, 0x6f,
+    0x6d, 0x3e, 0x20, 0x31, 0x32, 0x32, 0x37, 0x38,
+    0x31, 0x34, 0x32, 0x39, 0x37, 0x20, 0x2b, 0x30,
+    0x30, 0x30, 0x30, 0x0a, 0x63, 0x6f, 0x6d, 0x6d,
+    0x69, 0x74, 0x74, 0x65, 0x72, 0x20, 0x43, 0x20,
+    0x4f, 0x20, 0x4d, 0x69, 0x74, 0x74, 0x65, 0x72,
+    0x20, 0x3c, 0x63, 0x6f, 0x6d, 0x6d, 0x69, 0x74,
+    0x74, 0x65, 0x72, 0x40, 0x65, 0x78, 0x61, 0x6d,
+    0x70, 0x6c, 0x65, 0x2e, 0x63, 0x6f, 0x6d, 0x3e,
+    0x20, 0x31, 0x32, 0x32, 0x37, 0x38, 0x31, 0x34,
+    0x32, 0x39, 0x37, 0x20, 0x2b, 0x30, 0x30, 0x30,
+    0x30, 0x0a, 0x0a, 0x41, 0x20, 0x6f, 0x6e, 0x65,
+    0x2d, 0x6c, 0x69, 0x6e, 0x65, 0x20, 0x63, 0x6f,
+    0x6d, 0x6d, 0x69, 0x74, 0x20, 0x73, 0x75, 0x6d,
+    0x6d, 0x61, 0x72, 0x79, 0x0a, 0x0a, 0x54, 0x68,
+    0x65, 0x20, 0x62, 0x6f, 0x64, 0x79, 0x20, 0x6f,
+    0x66, 0x20, 0x74, 0x68, 0x65, 0x20, 0x63, 0x6f,
+    0x6d, 0x6d, 0x69, 0x74, 0x20, 0x6d, 0x65, 0x73,
+    0x73, 0x61, 0x67, 0x65, 0x2c, 0x20, 0x63, 0x6f,
+    0x6e, 0x74, 0x61, 0x69, 0x6e, 0x69, 0x6e, 0x67,
+    0x20, 0x66, 0x75, 0x72, 0x74, 0x68, 0x65, 0x72,
+    0x20, 0x65, 0x78, 0x70, 0x6c, 0x61, 0x6e, 0x61,
+    0x74, 0x69, 0x6f, 0x6e, 0x0a, 0x6f, 0x66, 0x20,
+    0x74, 0x68, 0x65, 0x20, 0x70, 0x75, 0x72, 0x70,
+    0x6f, 0x73, 0x65, 0x20, 0x6f, 0x66, 0x20, 0x74,
+    0x68, 0x65, 0x20, 0x63, 0x68, 0x61, 0x6e, 0x67,
+    0x65, 0x73, 0x20, 0x69, 0x6e, 0x74, 0x72, 0x6f,
+    0x64, 0x75, 0x63, 0x65, 0x64, 0x20, 0x62, 0x79,
+    0x20, 0x74, 0x68, 0x65, 0x20, 0x63, 0x6f, 0x6d,
+    0x6d, 0x69, 0x74, 0x2e, 0x0a, 0x0a, 0x53, 0x69,
+    0x67, 0x6e, 0x65, 0x64, 0x2d, 0x6f, 0x66, 0x2d,
+    0x62, 0x79, 0x3a, 0x20, 0x41, 0x20, 0x55, 0x20,
+    0x54, 0x68, 0x6f, 0x72, 0x20, 0x3c, 0x61, 0x75,
+    0x74, 0x68, 0x6f, 0x72, 0x40, 0x65, 0x78, 0x61,
+    0x6d, 0x70, 0x6c, 0x65, 0x2e, 0x63, 0x6f, 0x6d,
+    0x3e, 0x0a,
+};
+
+static git_rawobj commit_obj = {
+	commit_data,
+	sizeof(commit_data),
+	GIT_OBJ_COMMIT
+};
+
+static object_data tree = {
+    "dff2da90b254e1beb889d1f1f1288be1803782df",
+    "test-objects/df",
+    "test-objects/df/f2da90b254e1beb889d1f1f1288be1803782df",
+};
+
+static unsigned char tree_data[] = {
+    0x31, 0x30, 0x30, 0x36, 0x34, 0x34, 0x20, 0x6f,
+    0x6e, 0x65, 0x00, 0x8b, 0x13, 0x78, 0x91, 0x79,
+    0x1f, 0xe9, 0x69, 0x27, 0xad, 0x78, 0xe6, 0x4b,
+    0x0a, 0xad, 0x7b, 0xde, 0xd0, 0x8b, 0xdc, 0x31,
+    0x30, 0x30, 0x36, 0x34, 0x34, 0x20, 0x73, 0x6f,
+    0x6d, 0x65, 0x00, 0xfd, 0x84, 0x30, 0xbc, 0x86,
+    0x4c, 0xfc, 0xd5, 0xf1, 0x0e, 0x55, 0x90, 0xf8,
+    0xa4, 0x47, 0xe0, 0x1b, 0x94, 0x2b, 0xfe, 0x31,
+    0x30, 0x30, 0x36, 0x34, 0x34, 0x20, 0x74, 0x77,
+    0x6f, 0x00, 0x78, 0x98, 0x19, 0x22, 0x61, 0x3b,
+    0x2a, 0xfb, 0x60, 0x25, 0x04, 0x2f, 0xf6, 0xbd,
+    0x87, 0x8a, 0xc1, 0x99, 0x4e, 0x85, 0x31, 0x30,
+    0x30, 0x36, 0x34, 0x34, 0x20, 0x7a, 0x65, 0x72,
+    0x6f, 0x00, 0xe6, 0x9d, 0xe2, 0x9b, 0xb2, 0xd1,
+    0xd6, 0x43, 0x4b, 0x8b, 0x29, 0xae, 0x77, 0x5a,
+    0xd8, 0xc2, 0xe4, 0x8c, 0x53, 0x91,
+};
+
+static git_rawobj tree_obj = {
+	tree_data,
+	sizeof(tree_data),
+	GIT_OBJ_TREE
+};
+
+static object_data tag = {
+    "09d373e1dfdc16b129ceec6dd649739911541e05",
+    "test-objects/09",
+    "test-objects/09/d373e1dfdc16b129ceec6dd649739911541e05",
+};
+
+static unsigned char tag_data[] = {
+    0x6f, 0x62, 0x6a, 0x65, 0x63, 0x74, 0x20, 0x33,
+    0x64, 0x37, 0x66, 0x38, 0x61, 0x36, 0x61, 0x66,
+    0x30, 0x37, 0x36, 0x63, 0x38, 0x63, 0x33, 0x66,
+    0x32, 0x30, 0x30, 0x37, 0x31, 0x61, 0x38, 0x39,
+    0x33, 0x35, 0x63, 0x64, 0x62, 0x65, 0x38, 0x32,
+    0x32, 0x38, 0x35, 0x39, 0x34, 0x64, 0x31, 0x0a,
+    0x74, 0x79, 0x70, 0x65, 0x20, 0x63, 0x6f, 0x6d,
+    0x6d, 0x69, 0x74, 0x0a, 0x74, 0x61, 0x67, 0x20,
+    0x76, 0x30, 0x2e, 0x30, 0x2e, 0x31, 0x0a, 0x74,
+    0x61, 0x67, 0x67, 0x65, 0x72, 0x20, 0x43, 0x20,
+    0x4f, 0x20, 0x4d, 0x69, 0x74, 0x74, 0x65, 0x72,
+    0x20, 0x3c, 0x63, 0x6f, 0x6d, 0x6d, 0x69, 0x74,
+    0x74, 0x65, 0x72, 0x40, 0x65, 0x78, 0x61, 0x6d,
+    0x70, 0x6c, 0x65, 0x2e, 0x63, 0x6f, 0x6d, 0x3e,
+    0x20, 0x31, 0x32, 0x32, 0x37, 0x38, 0x31, 0x34,
+    0x32, 0x39, 0x37, 0x20, 0x2b, 0x30, 0x30, 0x30,
+    0x30, 0x0a, 0x0a, 0x54, 0x68, 0x69, 0x73, 0x20,
+    0x69, 0x73, 0x20, 0x74, 0x68, 0x65, 0x20, 0x74,
+    0x61, 0x67, 0x20, 0x6f, 0x62, 0x6a, 0x65, 0x63,
+    0x74, 0x20, 0x66, 0x6f, 0x72, 0x20, 0x72, 0x65,
+    0x6c, 0x65, 0x61, 0x73, 0x65, 0x20, 0x76, 0x30,
+    0x2e, 0x30, 0x2e, 0x31, 0x0a,
+};
+
+static git_rawobj tag_obj = {
+	tag_data,
+	sizeof(tag_data),
+	GIT_OBJ_TAG
+};
+
+static object_data zero = {
+    "e69de29bb2d1d6434b8b29ae775ad8c2e48c5391",
+    "test-objects/e6",
+    "test-objects/e6/9de29bb2d1d6434b8b29ae775ad8c2e48c5391",
+};
+
+static unsigned char zero_data[] = {
+    0x00  /* dummy data */
+};
+
+static git_rawobj zero_obj = {
+	zero_data,
+	0,
+	GIT_OBJ_BLOB
+};
+
+static object_data one = {
+    "8b137891791fe96927ad78e64b0aad7bded08bdc",
+    "test-objects/8b",
+    "test-objects/8b/137891791fe96927ad78e64b0aad7bded08bdc",
+};
+
+static unsigned char one_data[] = {
+    0x0a,
+};
+
+static git_rawobj one_obj = {
+	one_data,
+	sizeof(one_data),
+	GIT_OBJ_BLOB
+};
+
+static object_data two = {
+    "78981922613b2afb6025042ff6bd878ac1994e85",
+    "test-objects/78",
+    "test-objects/78/981922613b2afb6025042ff6bd878ac1994e85",
+};
+
+static unsigned char two_data[] = {
+    0x61, 0x0a,
+};
+
+static git_rawobj two_obj = {
+	two_data,
+	sizeof(two_data),
+	GIT_OBJ_BLOB
+};
+
+static object_data some = {
+    "fd8430bc864cfcd5f10e5590f8a447e01b942bfe",
+    "test-objects/fd",
+    "test-objects/fd/8430bc864cfcd5f10e5590f8a447e01b942bfe",
+};
+
+static unsigned char some_data[] = {
+    0x2f, 0x2a, 0x0a, 0x20, 0x2a, 0x20, 0x54, 0x68,
+    0x69, 0x73, 0x20, 0x66, 0x69, 0x6c, 0x65, 0x20,
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+
+static git_rawobj some_obj = {
+	some_data,
+	sizeof(some_data),
+	GIT_OBJ_BLOB
+};