source common.sh clearStore drvPath=$(nix-instantiate simple.nix) echo "derivation is $drvPath" outPath=$(nix-store -q --fallback "$drvPath") echo "output path is $outPath" # Build with a substitute that fails. This should fail. export NIX_SUBSTITUTERS=$(pwd)/substituter2.sh if nix-store -r "$drvPath"; then echo unexpected fallback; exit 1; fi # Build with a substitute that fails. This should fall back to a source build. export NIX_SUBSTITUTERS=$(pwd)/substituter2.sh nix-store -r --fallback "$drvPath" text=$(cat "$outPath"/hello) if test "$text" != "Hello World!"; then exit 1; fi