1{ 2 pkgs ? import <nixpkgs> { }, 3 feature, 4}: 5 6pkgs.runCommandNoCC "${feature}-not-present" { } '' 7 if [[ -e /${feature}-files ]]; then 8 echo "No ${feature} in requiredSystemFeatures, but /${feature}-files was mounted anyway" 9 exit 1 10 else 11 touch $out 12 fi 13''
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