[amine@nixos:~/src/nixops]$ ./dev-shell --arg p '(p: [ (p.callPackage ../nixops-aws/release.nix {})])'
warning: unknown setting 'experimental-features'
warning: unknown setting 'experimental-features'
trace: Using plugins: ["/nix/store/22ibqhmmgaamhckafp2j8qvia9xs8am5-nixops-aws-1.7pre0_abcdef"]
Sourcing python-catch-conflicts-hook.sh
Sourcing python-remove-bin-bytecode-hook.sh
Sourcing setuptools-build-hook
Using setuptoolsBuildPhase
Sourcing pip-install-hook
Using pipInstallPhase
Sourcing python-imports-check-hook.sh
Using pythonImportsCheckPhase
Sourcing setuptools-check-hook
Using setuptoolsCheckPhase

[nix-shell:~/src/nixops]$