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