# Instantiate.
storeExpr=$($TOP/src/nix-instantiate/nix-instantiate substitutes.nix)
echo "store expr is $storeExpr"

# Find the output path.
outPath=$($TOP/src/nix-store/nix-store -qvvvvv "$storeExpr")
echo "output path is $outPath"

# Build the substitute program.
subProgram=$($TOP/src/nix-store/nix-store -qnf \
    $($TOP/src/nix-instantiate/nix-instantiate substituter.nix))/substituter
echo "substitute program is $subProgram"

regSub() {
    (echo $1 && echo $2 && echo 3 && echo $outPath && echo Hallo && echo Wereld) | $TOP/src/nix-store/nix-store --substitute
}

# Register a fake successor, and a substitute for it.
suc=$NIX_STORE_DIR/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa-s.store
regSub $suc $subProgram
$TOP/src/nix-store/nix-store --successor $storeExpr $suc

# Register a substitute for the output path.
regSub $outPath $subProgram


$TOP/src/nix-store/nix-store -rvvvvv "$storeExpr"

text=$(cat "$outPath"/hello)
if test "$text" != "Hallo Wereld"; then exit 1; fi