Add LXC containers upgrade script

1 files changed, 35 insertions, 0 deletions

diff --git a/upgrade-containers.sh b/upgrade-containers.sh
new file mode 100755
index 0000000..dd4bba2
--- /dev/null
+++ b/upgrade-containers.sh
@@ -0,0 +1,35 @@
+#!/bin/sh -euf
+
+usage() (
+        echo "upgrade-containers.sh"
+        echo
+        echo "Upgrade currently running LXC containers."
+        echo "Uses apt-get for Debian and apk for Alpine."
+        echo
+)
+
+upgrade_container() (
+        NAME="$1"
+
+        RELEASE_FILE="/var/lib/lxc/$NAME/rootfs/etc/os-release"
+
+        if grep -q "ID=debian" "$RELEASE_FILE"; then
+                lxc-attach -n "$NAME" -- apt-get update
+                lxc-attach -n "$NAME" -- apt-get upgrade -y
+        elif grep -q "ID=alpine" "$RELEASE_FILE"; then
+                lxc-attach -n "$NAME" -- apk update
+                lxc-attach -n "$NAME" -- apk upgrade
+        fi
+)
+
+upgrade_running_containers() (
+        for CONTAINER in $(lxc-ls --running); do
+                upgrade_container "$CONTAINER"
+        done
+)
+
+case "${1:-run}" in
+        "help") usage;;
+        "run")  upgrade_running_containers;;
+esac
+