Add kickstart.user functions

kickstart/recipes/kickstart.sh

@@ -31,6 +31,14 @@ kickstart.command_exists() {
   which $1 >/dev/null 2>&1
 }
 
+kickstart.print_with_separator() {
+  (
+  IFS=$1
+  shift
+  echo -e "$*"
+  )
+}
+
 for recipe in recipes/kickstart/*; do
   source $recipe
 done

kickstart/recipes/kickstart/user.sh

@@ -2,7 +2,18 @@ kickstart.user.create() {
   kickstart.mute "id $1" || ( useradd -m -s /bin/bash -U -p `openssl passwd -1 $2` $1 )
 }
 
+kickstart.user.is_on_group() {
+  grep -q $2 <(id -nG $1)
+}
+
 kickstart.user.add_group() {
   kickstart.info "Adding $2 group to $1"
-  grep -q $2 <(groups $1) || usermod -a -G $2 $1
+  kickstart.user.is_on_group $1 $2 || usermod -a -G $2 $1
+}
+
+kickstart.user.remove_group() {
+  kickstart.info "Remove $1 from group $2"
+  kickstart.user.is_on_group $1 $2 && \
+    IFS=" " read -a groups < <(id -nG $1 | sed "s/$2//") && \
+    usermod -G `kickstart.print_with_separator , ${groups[*]}` $1
 }