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# Test for VfsLfs using a RAM device, mtime feature
try:
import time, vfs
time.time_ns
time.sleep
vfs.VfsLfs2
except (ImportError, AttributeError):
print("SKIP")
raise SystemExit
class RAMBlockDevice:
ERASE_BLOCK_SIZE = 1024
def __init__(self, blocks):
self.data = bytearray(blocks * self.ERASE_BLOCK_SIZE)
def readblocks(self, block, buf, off):
addr = block * self.ERASE_BLOCK_SIZE + off
for i in range(len(buf)):
buf[i] = self.data[addr + i]
def writeblocks(self, block, buf, off):
addr = block * self.ERASE_BLOCK_SIZE + off
for i in range(len(buf)):
self.data[addr + i] = buf[i]
def ioctl(self, op, arg):
if op == 4: # block count
return len(self.data) // self.ERASE_BLOCK_SIZE
if op == 5: # block size
return self.ERASE_BLOCK_SIZE
if op == 6: # erase block
return 0
def test(bdev, vfs_class):
print("test", vfs_class)
# Initial format of block device.
vfs_class.mkfs(bdev)
# construction
print("mtime=True")
fs = vfs_class(bdev, mtime=True)
# Create an empty file, should have a timestamp.
# Use time_ns() for current time because that's what's used for VfsLfs2 time.
current_time = time.time_ns() // 1_000_000_000
fs.open("test1", "wt").close()
# Wait 1 second so mtime will increase by at least 1.
time.sleep(1)
# Create another empty file, should have a timestamp.
fs.open("test2", "wt").close()
# Stat the files and check mtime is non-zero.
stat1 = fs.stat("test1")
stat2 = fs.stat("test2")
print(stat1[8] != 0, stat2[8] != 0)
# Check that test1 has mtime which matches time.time_ns() at point of creation.
print(current_time <= stat1[8] <= current_time + 1)
# Check that test1 is older than test2.
print(stat1[8] < stat2[8])
# Wait 1 second so mtime will increase by at least 1.
time.sleep(1)
# Open test1 for reading and ensure mtime did not change.
fs.open("test1", "rt").close()
print(fs.stat("test1") == stat1)
# Open test1 for writing and ensure mtime increased from the previous value.
fs.open("test1", "wt").close()
stat1_old = stat1
stat1 = fs.stat("test1")
print(stat1_old[8] < stat1[8])
# Unmount.
fs.umount()
# Check that remounting with mtime=False can read the timestamps.
print("mtime=False")
fs = vfs_class(bdev, mtime=False)
print(fs.stat("test1") == stat1)
print(fs.stat("test2") == stat2)
f = fs.open("test1", "wt")
f.close()
print(fs.stat("test1") == stat1)
fs.umount()
# Check that remounting with mtime=True still has the timestamps.
print("mtime=True")
fs = vfs_class(bdev, mtime=True)
print(fs.stat("test1") == stat1)
print(fs.stat("test2") == stat2)
fs.umount()
try:
bdev = RAMBlockDevice(30)
except MemoryError:
print("SKIP")
raise SystemExit
test(bdev, vfs.VfsLfs2)
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