Upgrade system via apt

This script upgrades the installed packages in an apt-based system.
After a kernel upgrade, the old kernel is removed (in order to save
space), and so are packages and package files that are no longer needed.

Partial-Bug: 1312764
Implements: blueprint openstack-training-labs
Change-Id: Iaadcebc424572787d3a2d77f6b19ab636d65ee58

labs/scripts/apt_upgrade.sh

@@ -0,0 +1,37 @@
+#!/usr/bin/env bash
+TOP_DIR=$(cd $(dirname "$0")/.. && pwd)
+source "$TOP_DIR/config/paths"
+source "$CONFIG_DIR/openstack"
+source "$LIB_DIR/functions.guest"
+
+indicate_current_auto
+
+exec_logfile
+
+# XXX We assume that apt_init.sh set up repos and updated the apt index files
+
+# Upgrade installed packages and the kernel
+sudo DEBIAN_FRONTEND=noninteractive apt-get -y upgrade
+sudo apt-get -y dist-upgrade
+
+# XXX Not a great location for Vagrant specific code
+if [[ $VM_SHELL_USER = vagrant ]]; then
+    if is_ubuntu; then
+        sudo apt-get -y install virtualbox-guest-dkms
+    fi
+fi
+
+# If we upgraded the kernel, remove the old one
+INSTALLED_KERNEL=$(readlink /vmlinuz)
+INSTALLED_KERNEL=${INSTALLED_KERNEL#boot/vmlinuz-}
+RUNNING_KERNEL=$(uname -r)
+
+if [[ $INSTALLED_KERNEL != $RUNNING_KERNEL ]]; then
+    echo "Kernel $INSTALLED_KERNEL installed. Removing $RUNNING_KERNEL."
+    sudo dpkg --purge "linux-image-$RUNNING_KERNEL"
+    sudo dpkg --purge "linux-headers-$RUNNING_KERNEL"
+fi
+
+# Clean apt cache
+sudo apt-get -y autoremove
+sudo apt-get -y clean