source common.sh drvPath=$($TOP/src/nix-instantiate/nix-instantiate fallback.nix) echo "derivation is $drvPath" outPath=$($TOP/src/nix-store/nix-store -q --fallback "$drvPath") echo "output path is $outPath" # Register a non-existant substitute (echo $outPath && echo "" && echo $TOP/no-such-program && echo 0 && echo 0) | $TOP/src/nix-store/nix-store --register-substitutes # Build the derivation $TOP/src/nix-store/nix-store -r --fallback "$drvPath" text=$(cat "$outPath"/hello) if test "$text" != "Hello World!"; then exit 1; fi