ruby: fix permissions and ln for oryx (#43)

* ruby: fix permissions and ln for oryx

* add sudo_if

src/ruby/install.sh

@@ -167,6 +167,14 @@ check_packages() {
     fi
 }
 
+sudo_if() {
+    COMMAND="$*"
+    if [ "$(id -u)" -eq 0 ] && [ "$USERNAME" != "root" ]; then
+        su - "$USERNAME" -c "$COMMAND"
+    else
+        "$COMMAND"
+    fi
+}
 
 # Ensure apt is in non-interactive to avoid prompts
 export DEBIAN_FRONTEND=noninteractive
@@ -271,11 +279,15 @@ if [ "${SKIP_RBENV_RBUILD}" != "true" ]; then
 
     if [ "${USERNAME}" != "root" ]; then
         mkdir -p /home/${USERNAME}/.rbenv/plugins
-        chown -R ${USERNAME} /home/${USERNAME}/.rbenv
+        sudo_if chown -R ${USERNAME} /home/${USERNAME}/.rbenv
+        sudo_if chown -R ${USERNAME} /usr/local/rvm/
 
         if [[ ! -d "/home/${USERNAME}/.rbenv/plugins/ruby-build" ]]; then
             ln -s /usr/local/share/ruby-build /home/${USERNAME}/.rbenv/plugins/ruby-build
         fi
+
+        ln -s /usr/local/rvm/rubies/default/bin/ruby /usr/local/rvm/gems/default/bin 
+        
     fi
 fi