Added flatpak system-wide packages backup/restore

scripts/flatpak

@@ -0,0 +1,38 @@
+#!/bin/bash
+
+hook_check() {
+    :
+}
+
+hook_pre() {
+    mkdir -p "$restoreDir" || exit 1
+    pushd "$restoreDir" || exit 2
+
+    which flatpak || exit 0
+
+    flatpak list --columns=application --app > flatpaks.lst
+
+    cat > restore-flatpak.sh <<EOF
+#!/bin/bash
+
+if [[ ! -f "flatpaks.lst" ]]; then
+    echo "This needs to be run inside the restore directory."
+    exit 1
+fi
+
+which flatpak || exit 0
+xargs flatpak install -y < flatpaks.lst
+EOF
+
+    popd || exit 2
+}
+
+hook_post() {
+    :
+}
+
+case "$1" in
+    before_check)   hook_check;;
+    before_backup)  hook_pre;;
+    after_backup)   hook_post;;
+esac