NixOS/nixpkgs — pull request #2720 by aristidb (2014-05-22 20:03:18+00:00)
Title: fhs-chrootenv (steam): support directly using users other than root, fix sound support, fix /run/user

/run/user/1000 was not mounted => --rbind
chroot did not have XDG_RUNTIME_DIR set => no sound when using PA
chroot had to be launched as root and then it couldn't automatically determine XDG_RUNTIME_DIR => launch it was your own user now