Add help/force/dry-run options to remove-old-kernels

remove-old-kernels

@@ -17,6 +17,42 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
 
+. shell-error
+. shell-args
+
+show_help()
+{
+        cat <<EOF
+Usage: $PROG [options]
+Valid options are:
+	-f, --force       non-interactive kernel removal (default is interactive)
+	-n, --dry-run     just simulate removal
+	-h, --help        show this text and exit
+EOF
+exit 1
+}
+
+#parse command line options
+TEMP=`getopt -n $PROG -o f,n,h -l force,dry-run,help -- "$@"` || show_help
+eval set -- "$TEMP"
+
+while :; do
+        case "$1" in
+                --) shift; break
+                        ;;
+                -f|--force) force="-y"
+                        ;;
+		-n|--dry-run) dryrun="--no-remove"
+			;;
+                -h|--help) show_help
+        esac
+	shift
+done
+
+if [ -n "$force" -a -n "$dryrun" ]; then
+	show_usage '--force and --dry-run are mutually exclusive options.'
+fi
+
 flavour_version_release="$(uname -r | awk -F- '{print $2"-"$3"-"$1"-"$4}')"
 old_kernels="$(rpm -qa | fgrep kernel-image | fgrep -v $flavour_version_release | tr '\n' ' ')"
 
@@ -30,4 +66,9 @@ done
 # use sudo(1) if running as unprivileged user
 [ "$UID" = "0" ] && SUDO= || SUDO=sudo
 
-$SUDO apt-get remove $apt_args_list
+$SUDO apt-get $force $dryrun remove $apt_args_list
+
+# Mask non-zero apt exit code on dry run:
+if [ -n "$dryrun" ]; then
+    exit 0
+fi