Introduce sysctl health checks for sandboxed Nix #21
+797
−690
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This PR adds environment checks to ensure that the Nix sandbox will work properly on Linux, before any obscure failures occur.
This fixes #20 by warning users to Ubuntu's aggressive AppArmor policy.
In the future, this could lead to falling back on system
bwrap
/proot
, like nix-portable does.