def makefs(root_path, verbose=False):
"""
Layout:
Superblock
All Inodes
Inode Freelist
Block Freelist
Root Directory
"""
if verbose:
print("Creating file system at {}".format(root_path))
bootstrap_data = bytes(ds.SuperBlock())
bootstrap_data += bytes(ds.BLOCK_SIZE * ds.NUM_INODES)
bootstrap_data += bytes(ds.InodeFreeList())
bootstrap_data += bytes(ds.DataBlockFreeList())
# TODO: Update write a real root directory
bootstrap_data += bytes(ds.DirectoryBlock())
bootstrap_data += bytes(ds.BLOCK_SIZE * ds.NUM_DATA_BLOCKS)
disk = device_io.Disk(root_path)
disk.open()
disk.seek(0)
disk.write(bootstrap_data)
# TODO: remove this hack when real root directory is written
ds.DataBlockFreeList(device=disk).allocate()
disk.close()
def test_decode_no_device(self):
self.cls = ds.SuperBlock(None)
input_data = b'\x1e\x00\x00\x00\x00\x00\x00\x00' + \
b'\x0A\x00\x00\x00\x00\x00\x00\x00' + \
b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
expected = [30, 10]
output = self.cls.__decode__(input_data)
self.assertEqual(output, expected)
def test_bytes(self):
ds.BLOCK_SIZE = 30
self.cls = ds.SuperBlock()
expected = b'\x1e\x00\x00\x00\x00\x00\x00\x00' + \
b'\x0A\x00\x00\x00\x00\x00\x00\x00' + \
b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
output = bytes(self.cls)
self.assertEqual(output, expected)
def test_decode_2(self):
ds.BLOCK_SIZE = 0 # precaution
self.cls = ds.SuperBlock()
input_data = b'\x0A\x00\x00\x00\x00\x00\x00\x00' + \
b'\x0A\x00\x00\x00\x00\x00\x00\x00' + \
b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
expected = [10, 10]
output = self.cls.__decode__(input_data)
self.assertEqual(output, expected)
def test_read_2(self):
input_data = b'\x0A\x00\x00\x00\x00\x00\x00\x00' + \
b'\x0A\x00\x00\x00\x00\x00\x00\x00' + \
b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
with open(PATH, 'wb') as f:
f.write(input_data)
device = device_io.Disk(PATH)
self.cls = ds.SuperBlock(device)
self.assertEqual(self.cls.block_size, 10)
self.assertEqual(self.cls.num_inodes, 10)
def test_allocate_with_device(self):
input_data = bytes(ds.SuperBlock()) + \
bytes(ds.NUM_INODES * ds.BLOCK_SIZE) + \
bytes(ds.InodeFreeList())
with open(PATH, 'wb') as f:
f.write(input_data)
self.cls = ds.Inode(device=device_io.Disk(PATH))
# self.assertEqual(self.cls.index, None) # New inode should have a None index
# self.cls.allocate()
self.assertEqual(self.cls.index, 0)
with self.assertRaises(Exception):
self.cls.allocate()
def test_write_1(self):
ds.BLOCK_SIZE = 30
device_io.BLOCK_SIZE = 30
ds.NUM_INODES = 10
expected = b'\x1e\x00\x00\x00\x00\x00\x00\x00' + \
b'\x0A\x00\x00\x00\x00\x00\x00\x00' + \
b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
self.cls = ds.SuperBlock(None)
self.cls._device = device_io.Disk(PATH)
self.cls.__write__()
with open(PATH, 'rb') as f:
output = f.read()
self.assertEqual(output, expected)
def setUp(self):
self.cls = ds.SuperBlock()
open(PATH, 'a').close()
