Command upspinfs is a FUSE interface for Upspin. It presents Upspin files as a locally mounted file system.

    If the config or flags specify a cache server endpoint and cacheserver is not running, upspinfs will attempt to start one. All the flags listed below are also passed to the cacheserver should one be started.


    upspinfs [flags] mountpoint
    where 'mountpoint' is an existing directory upon which to mount the Upspin name space.

    The flags are:

    -cachedir directory
    	'directory' will contain all file caches (default "$HOME/upspin")
    -cachesize bytes
    	max disk bytes for cache (default 5000000000)
    -config file
    	user's configuration file (default "$HOME/upspin/config")
    -log level
    	level of logging: debug, info, error, disabled (default info)
    	make storage cache writethrough


    % mkdir $HOME/ufs
    % upspinfs $HOME/ufs &
    % ls -l $HOME/ufs/
    % ...
    % killall -9 upspinfs
    % umount $HOME/ufs


    Uspinfs tries to present a Posix file system. However since Upspin semantics are different than Posix, some things will be different:

    - Files always appear owned by the user who started upspinfs

    - Permission bits are settable but are not stored in Upspin. After the final close of a file, when the kernel and FUSE decide to forget about the file, permissions will revert to 0700. The access to a file is determined by the intersection of the permission bits and the relevant Access file.

    - While random access will work, the first time a file is opened for read, it is read in its entirety and cached locally.

    - Hard links are really copy on write. The two names will refer to the original data until either file is changed. They will then diverge.


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