Miscellaneous proxy filesystems for Pyfilesystem2
Install directly from PyPI, using pip
pip install fs.proxy
This module revolves around the notion of proxy filesystems, akin to wrapper filesystems from the core library, but using a proxy in combination with the delegate filesystem used by WrapFS. They also make it easier to create generic wrappers, as fs.proxy.base.Proxy subclasses will use the fs.base.FS method implementation, while actually deriving from WrapFS !
This extension includes a base fs.proxy.base.Proxy class, that requires only the essential filesystem methods to be implemented.
The fs.proxy.writer package also declares two classes that can be used to make any read-only filesystem writeable, using a secondary writeable filesystem: fs.proxy.writer.ProxyWriter and fs.proxy.writer.SwapWriter. ProxyWriter will always write modifications to the secondary filesystem (often a MemoryFS or a TempFS), while SwapWriter will use a third backup filesystem in case the memory footprint of the proxy filesystem becomes too large (swapping from a MemoryFS to an OSFS, etc.). For instance, let’s pretend we can write to the root:
>>> import fs.proxy.writer >>> read_only_fs = fs.open_fs(u'/') # this is not actually read-only ;) >>> writeable_fs = fs.proxy.writer.ProxyWriter(read_only_fs) >>> writeable_fs.setbytes(u'/root.txt', b'I am writing in root !') >>> writeable_fs.exists(u'/root.txt') True >>> read_only_fs.exists(u'/root.txt') False
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