src/zlevis-mkinitfs.in: update

Added check functionality, to check if zlevis is installed into mkinitfs
and if the features are active.

src/zlevis-mkinitfs.in

@@ -24,7 +24,7 @@ fi
 # Function to display usage information of zlevis-mkinitfs
 info() {
     exec >&2
-    echo "Usage: \"zlevis-mkinitfs {install|uninstall}\""
+    echo "Usage: \"zlevis-mkinitfs {install|uninstall|check}\""
     exit 2
 }
 
@@ -95,9 +95,31 @@ uninstall() {
     fi
 }
 
+# Function to check if zlevis is installed in mkinitfs
+check() {
+    if grep -q "zlevis" "${loc_mkinitfs}/initramfs-init"; then
+        if [ -f "${loc_mkinitfs}/initramfs-init.bak" ]; then
+            echo "[+] zlevis is installed in mkinitfs with zlevis-mkinitfs"
+        else
+            echo "[+] zlevis is installed in mkinitfs without zlevis-mkinitfs"
+        fi    
+    else
+        echo "[-] zlevis is not installed into mkinitfs"
+    fi
+    
+    if grep -q "^features=.*zlevis" "$loc_conf"; then
+        echo "[+] zlevis is present in features"
+        exit 0
+    else
+        echo "[-] zlevis is not present in features"
+        exit 0
+    fi
+}
+
 # Determine the argument path and execute the relevant function
 case "$1" in
     "install") install;;
     "uninstall") uninstall;;
+    "check") check;;
     *) info;;
 esac