source common.sh

drvPath=$(nix-instantiate dependencies.nix)
outPath=$(nix-store -rvv "$drvPath")

# Set a GC root.
rm -f "$NIX_STATE_DIR"/gcroots/foo
ln -sf $outPath "$NIX_STATE_DIR"/gcroots/foo

[ "$(nix-store -q --roots $outPath)" = "$NIX_STATE_DIR/gcroots/foo -> $outPath" ]

nix-store --gc --print-roots | grep $outPath
nix-store --gc --print-live | grep $outPath
nix-store --gc --print-dead | grep $drvPath
if nix-store --gc --print-dead | grep $outPath; then false; fi

nix-store --gc --print-dead

inUse=$(readLink $outPath/input-2)
if nix-store --delete $inUse; then false; fi
test -e $inUse

if nix-store --delete $outPath; then false; fi
test -e $outPath

nix-collect-garbage

# Check that the root and its dependencies haven't been deleted.
cat $outPath/foobar
cat $outPath/input-2/bar

# Check that the derivation has been GC'd.
if test -e $drvPath; then false; fi

rm "$NIX_STATE_DIR"/gcroots/foo

nix-collect-garbage

# Check that the output has been GC'd.
if test -e $outPath/foobar; then false; fi