Add subid shell func

1 files changed, 29 insertions, 0 deletions

diff --git a/kshrc b/kshrc
index d6a5207..816fe1b 100644
--- a/kshrc
+++ b/kshrc
@@ -373,6 +373,35 @@ passenv() {
 	rm -f "$_f"
 }
 
+# gensubids is useful for generating /etc/subuid and /etc/subgid
+# if you have say a 3rd user you want to add 
+gensubids() {
+	_step=65536
+	_err=0
+	_un=
+	_n=
+	while [ $# -gt 0 ] ; do case $1 in
+		-u) _un="$2"; shift ; shift ;;
+		-n) _n="$2"; shift ; shift ;;
+		*)
+			echo "unknown option: $1";
+			echo "gensubids -u <username> -n <entry_number>";
+			return 1 ;;
+	esac ; done
+	if [ -z "$_n" ] ; then
+		echo "need a number"
+		_err=1
+	fi
+	if [ -z "$_un" ] ; then
+		echo "need a username"
+		_err=1
+	fi
+	if [ "$_err" -eq 1 ] ; then
+		return 1;
+	fi
+	echo "$_un:$(( (_n*_step) + 1 )):$(( (_n*_step) + _step ))"
+}
+
 scangit() {
 	ref="origin/master"
 	while [ $# -gt 0 ] ; do case $1 in