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* pkgs/sandbox: Add handling for XDG_CACHE_HOMEaszlig2017-11-301-19/+15
| | | | | | | | | | | | We only handle XDG_DATA_HOME and XDG_CONFIG_HOME, but we've missed XDG_CACHE_HOME. While the latter is used very rarely as it doesn't matter a lot if it ends up within a tmpfs anyway. However if the cache directory gets pretty large we might run out of space. Not only do we now have proper fallbacks but this also adds tests for all of the XDG environment variables we're using. Signed-off-by: aszlig <aszlig@nix.build>
* pkgs/sandbox: Handle mounting of regular filesaszlig2017-11-301-33/+43
| | | | | | | | | | | | | | | While we already have support for mounting plain files, this is done on a very specific basis, mainly the .Xauthority file. Whenever we use bind_mount() and the file is a regular file, mounting that file will fail. So let's actually do a stat on the file and decide whether we want to do bind_file() or bind_mount(). I've stumbled on this because one of the store paths of the run time dependency graph was a plain file and thus the sandbox wrapper was unable to mount it. Signed-off-by: aszlig <aszlig@nix.build>
* build-sandbox: Move to top-level build-supportaszlig2017-11-309-0/+932
This is not only useful for packaging games, so let's make it available from the vuizvui scope, so we can use it from other packages as well. Signed-off-by: aszlig <aszlig@nix.build>