tests: add test for ostree deduplication

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>

tests/import-layer-ostree.bats

@@ -0,0 +1,59 @@
+#!/usr/bin/env bats
+
+load helpers
+
+@test "import-layer-ostree" {
+	case "$STORAGE_DRIVER" in
+	overlay*|vfs)
+		;;
+	*)
+		skip "not supported by driver $STORAGE_DRIVER"
+		;;
+	esac
+
+	# The checkdiffs function needs "tar".
+	if test -z "$(which tar 2> /dev/null)" ; then
+		skip "need tar"
+	fi
+	if test -z "$(which ostree 2> /dev/null)" ; then
+		skip "need ostree"
+	fi
+
+	OSTREE_REPO=${TESTDIR}/ostree
+	mkdir -p $OSTREE_REPO
+
+	# Create and populate three interesting layers.
+	populate
+
+	OPTS="--storage-opt=.ostree_repo=$OSTREE_REPO,.skip_mount_home=true"
+
+	# Extract the layers.
+	storage diff $OPTS -u -f $TESTDIR/lower.tar $lowerlayer
+	storage diff $OPTS -c -f $TESTDIR/middle.tar $midlayer
+	storage diff $OPTS -u -f $TESTDIR/upper.tar $upperlayer
+
+	# Delete the layers.
+	storage delete-layer $OPTS $upperlayer
+	storage delete-layer $OPTS $midlayer
+	storage delete-layer $OPTS $lowerlayer
+
+	# Import new layers using the layer diffs and mark them read-only.  Only read-only layers are deduplicated with OSTree.
+	run storage --debug=false import-layer $OPTS -r -f $TESTDIR/lower.tar
+	[ "$status" -eq 0 ]
+	[ "$output" != "" ]
+	lowerlayer="$output"
+
+	run storage --debug=false import-layer $OPTS -r -f $TESTDIR/middle.tar "$lowerlayer"
+	[ "$status" -eq 0 ]
+	[ "$output" != "" ]
+	midlayer="$output"
+
+	run storage --debug=false import-layer $OPTS -r -f $TESTDIR/upper.tar "$midlayer"
+	[ "$status" -eq 0 ]
+	[ "$output" != "" ]
+	upperlayer="$output"
+
+	# The contents of these new layers should match what the old ones had.
+	checkchanges
+	checkdiffs
+}