add script for patching base OS's

files/patch-os.sh

@@ -0,0 +1,49 @@
+#!/bin/sh
+
+patch_debian() {
+    echo "Patching Debian"
+    apt-get update
+    apt-get upgrade -y 
+    rm -rf /var/lib/apt/lists/*
+}
+
+patch_ubi_dnf() {
+    echo "Patching UBI dnf"
+    DNF=""
+    if [ -f /usr/bin/microdnf ]; then
+        DNF=/usr/bin/microdnf
+    else
+        DNF=/usr/bin/dnf
+    fi
+    ${DNF} update -y
+    ${DNF} clean all
+
+}
+
+patch_alpine() {
+    echo "Patching Alpine"
+    apk upgrade --no-cache -U
+}
+
+if [ ! -f /etc/os-release ]; then
+    echo "ERROR: cannot find /etc/os-release, cannot continue."
+    exit 1
+fi
+
+. /etc/os-release
+
+case ${ID} in
+   "debian")
+      patch_debian
+      ;;
+   "rhel")
+      patch_ubi_dnf
+      ;;
+   "alpine")
+      patch_alpine
+      ;;
+   *)
+     echo "ERROR: unsupported OS [${ID}]"
+     exit 1
+     ;;
+esac