40ad8f1666
This is consistent with the other 'micro' modules and allows implementing additional features in Python via e.g. micropython-lib's sys. Note this is a breaking change (not backwards compatible) for ports which do not enable weak links, as "import sys" must now be replaced with "import usys".
85 lines
1.8 KiB
Python
85 lines
1.8 KiB
Python
# test VFS functionality with a user-defined filesystem
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# also tests parts of uio.IOBase implementation
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import usys
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try:
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import uio
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uio.IOBase
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import uos
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uos.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(uio.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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}
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uos.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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usys.path.append("/userfs")
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import usermod1
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# unmount and undo path addition
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uos.umount("/userfs")
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usys.path.pop()
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