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* pkgs/sandbox: Use own store path as root directoryaszlig2017-10-032-10/+9
| | | | | | | | | | | | | | | | | | | I've already pointed out in the previous commit that using /tmp for the root directory isn't a very good idea, mainly because we can't access sockets from /tmp (eg. the X server sockets). So what we're now doing is using the store path that contains the sandbox wrappers, because that very path won't be mounted into the sandbox anyway, so we get a free directory just as an entry point. This has the main advantage that we don't need to create any temporary directories which we later need to clean up nor do we need to assume that some paths might exist in the system. For example if we'd use /usr we still have /usr/bin/env on NixOS, but if that's going to go away in the future or we are on a distro that doesn't have it at all, the sandbox setup will fail. Signed-off-by: aszlig <aszlig@redmoonstudios.org>
* pkgs/build-game: Introduce buildSandboxaszlig2017-10-032-0/+557
So far creating the sandbox has been a setup hook, however it's a bit ugly how we gathered the needed paths for the chroot file system by recursively searching for store paths. While I'd like to have the sandbox being built within the main derivation, it really isn't very practical when the build takes longer than 10 minutes. With this implementation however the sandbox builds really fast and we can also modify the sandbox without needing to rebuild a particular game. Signed-off-by: aszlig <aszlig@redmoonstudios.org>