Issue description

nginx: [alert] could not open error log file: open() "/nix/store/hb8dy23a4qkkxx3y3m70wqsn2vyfk56n-nginx-1.12.1/logs/error.log" failed (30: Read-only file system)

Steps to reproduce

add nginx to environment.systemPackages and run

nginx -t -c /nix/store/kxgbapyyrxg0q4jxbxnnk0kj0cbrvrn8-nginx.conf

Technical details

• system: "x86_64-linux"
• host os: Linux 4.13.4, NixOS, 17.09.git.39cd40f (Hummingbird)
• multi-user?: yes
• sandbox: no
• version: nix-env (Nix) 1.11.15
• channels(root): "nixos-17.09.2182.7f6f0c49f0"
• nixpkgs: /nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs