storeExpr=$($TOP/src/nix-instantiate/nix-instantiate fall-back.nix) echo "store expr is $storeExpr" # Register a non-existant successor (and a nox-existant substitute). suc=$NIX_STORE_DIR/deadbeafdeadbeafdeadbeafdeadbeaf-s.store (echo $suc && echo $NIX_STORE_DIR/ffffffffffffffffffffffffffffffff.store && echo "/bla" && echo 0) | $TOP/src/nix-store/nix-store --substitute $TOP/src/nix-store/nix-store --successor $storeExpr $suc outPath=$($TOP/src/nix-store/nix-store -qnf "$storeExpr") echo "output path is $outPath" text=$(cat "$outPath"/hello) if test "$text" != "Hello World!"; then exit 1; fi