Overriding the check for ownership of a prefix

Scott Ritchie scott at open-vote.org
Wed Oct 3 16:22:40 CDT 2012

On 9/19/12 5:23 PM, Scott Ritchie wrote:
> So, I believe I have a legitimate use case for ignoring this, and want
> to know what sort of patch would go forward.
> Imagine a distro package containing a Windows game in the form of a
> read-only copy of an installed prefix (into, say, /opt).  When the user
> launches the app (via desktop file) this in turn launches a script that
> does the following:
> 1) Makes a temporary folder
> 2) Sets up a unionfs-fuse copy-on-write mount between ~/.appname and the
> read-only packaged prefix in /opt, mounted in the temporary folder
> 3) Runs the app with WINEPREFIX= the temp folder
> 4) When the app is finished, unmounts the temp folder
> This all works quite fine: new (or modified) files within the prefix get
> stored in ~/.appname, to be restored the next time the user runs the
> app.  Distinct users can run the app simultaneously, as they each have
> their own prefix.  Excess file-copying is avoided, as only the
> user-modified files need to be stored in the home folders.
> There is one major snag, however: unionfs displays the owner as root
> until the user has modified/copied it.  This means Wine refuses to
> launch as the user with the "root-owned" prefix.  Simply commenting out
> this part of the code makes Wine work fine, however I'd like to be able
> to have a proper solution.

I have found a better solution: you can use standard FUSE options to 
mask the true owner such that it is always presented as the mounting 
user, even if the file is untouched.

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