1 files changed, 20 insertions, 2 deletions

diff --git a/lib/osi.sh b/lib/osi.sh
index f32e49d..4ee758b 100644
--- a/lib/osi.sh
+++ b/lib/osi.sh
@@ -26,18 +26,36 @@ in_array() {
 	return 1
 }
 
+is_sudo() {
+	(( UID == 0 && ${SUDO_UID:-0} != 0 ))
+}
+
+is_root() {
+	(( UID = 0 ))
+}
+
 needs_sudo() {
-	if (( UID != 0 || ${SUDO_UID:-0} == 0 )); then
+	if ! is_sudo; then
 		error 4 "Must be invoked through sudo."
 	fi
 }
 
 needs_root() {
-	if (( UID != 0 )); then
+	if ! is_root; then
 		error 4 "Must be invoked as root."
 	fi
 }
 
+become_sudo() {
+	if is_sudo; then
+		return 0
+	fi
+	if is_root; then
+		needs_sudo
+	fi
+	sudo "${BASH_SOURCE[0]}" "$@"
+}
+
 with_mount() {
 	arg_device=$1
 	arg_mountpoint=$2