Add setup users task

configs/crystal/setup-users/up.nu

@@ -1,6 +1,28 @@
 let RUN_IN_CHROOT = true;
+
+def create_user [user] {
+    debug $"Configuring user $($user.name)"
+    let shell = $"/usr/bin/($user.shell)"
+    run useradd -m -s $shell -p $user.password $user.name
+
+    if $user.sudoer {
+        debug "user is sudoer"        
+        run usermod -aG wheel $user.name
+    }
+
+    touch "/var/lib/AccountsService/users/($user.name)"
+    "[User]\nsession=onyx" | save -a "/var/lib/AccountsService/users/($user.name)"
+    info $"Created user ($user.name)"
+}
+
 # Applies all system changes of `setup-users`
 def main [cfg] {
-    echo "Executing up task `setup-users` with config" $cfg
-    todo "Implement setup-users"
+    debug $"Configuring users with config ($cfg)"
+    ( open /etc/sudoers 
+        | str replace "^# (%wheel ALL=(ALL:ALL) ALL)$" "$1" 
+        | $in + "\nDefaults pwfeedback\n" 
+        | save -f /etc/sudoers )
+    mkdir /var/lib/AccountsService/users
+
+    $cfg | each { |$user_cfg| create_user $user_cfg }
 }