92 lines
2.0 KiB
Python
92 lines
2.0 KiB
Python
# test VFS functionality with a user-defined filesystem
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# also tests parts of io.IOBase implementation
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import sys
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try:
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import io
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io.IOBase
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import os
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os.mount
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except (ImportError, AttributeError):
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print("SKIP")
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raise SystemExit
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class UserFile(io.IOBase):
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def __init__(self, mode, data):
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assert isinstance(data, bytes)
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self.is_text = mode.find("b") == -1
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self.data = data
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self.pos = 0
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def read(self):
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if self.is_text:
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return str(self.data, "utf8")
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else:
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return self.data
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def readinto(self, buf):
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assert not self.is_text
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n = 0
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while n < len(buf) and self.pos < len(self.data):
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buf[n] = self.data[self.pos]
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n += 1
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self.pos += 1
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return n
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def ioctl(self, req, arg):
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print("ioctl", req, arg)
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return 0
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class UserFS:
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def __init__(self, files):
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self.files = files
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def mount(self, readonly, mksfs):
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pass
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def umount(self):
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pass
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def stat(self, path):
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print("stat", path)
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if path in self.files:
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return (32768, 0, 0, 0, 0, 0, 0, 0, 0, 0)
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raise OSError
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def open(self, path, mode):
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print("open", path, mode)
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return UserFile(mode, self.files[path])
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# create and mount a user filesystem
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user_files = {
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"/data.txt": b"some data in a text file",
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"/usermod1.py": b"print('in usermod1')\nimport usermod2",
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"/usermod2.py": b"print('in usermod2')",
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"/usermod3.py": b"syntax error",
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}
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os.mount(UserFS(user_files), "/userfs")
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# open and read a file
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f = open("/userfs/data.txt")
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print(f.read())
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# import files from the user filesystem
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sys.path.append("/userfs")
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import usermod1
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# import a .py file with a syntax error (file should be closed on error)
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try:
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import usermod3
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except SyntaxError:
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print("SyntaxError in usermod3")
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# unmount and undo path addition
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os.umount("/userfs")
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sys.path.pop()
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