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nixfiles/pkgs/clerie-system-upgrade/clerie-system-upgrade.sh

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#!/usr/bin/env bash
set -euo pipefail
ALLOW_REBOOT=
NO_CONFIRM=
NODE_EXPORTER_METRICS_PATH=
while [[ $# -gt 0 ]]; do
case $1 in
--allow-reboot)
ALLOW_REBOOT=1
shift
;;
--no-confirm)
NO_CONFIRM=1
shift
;;
--node-exporter-metrics-path)
NODE_EXPORTER_METRICS_PATH=$2
shift
shift
;;
*)
echo "Unknown option $1"
exit 1
;;
esac
done
HYDRA_JOB_URL="https://hydra.clerie.de/job/nixfiles/nixfiles/nixosConfigurations.${HOSTNAME}/latest-finished"
echo "Fetching job output from ${HYDRA_JOB_URL}"
STORE_PATH="$(curl --fail -s -L -H "Accept: application/json" "${HYDRA_JOB_URL}" | jq -r ".buildoutputs.out.path")"
if [[ -z $NO_CONFIRM ]]; then
echo ""
echo " ! WARNING !"
echo ""
echo " You are about to upgrade ${HOSTNAME} to ${STORE_PATH}."
echo " This can be an older version than currently running on this system."
echo ""
read -e -r -p "Continue?" confirm
echo "$confirm" > /dev/null
fi
echo "Download ${STORE_PATH}"
nix copy --from "https://nix-cache.clerie.de" "${STORE_PATH}"
echo "Add to system profile"
nix-env -p "/nix/var/nix/profiles/system" --set "${STORE_PATH}"
echo "Set as boot target"
/nix/var/nix/profiles/system/bin/switch-to-configuration boot
if [[ -n "$NODE_EXPORTER_METRICS_PATH" ]]; then
echo "Write monitoring check data"
echo "clerie_system_upgrade_last_check $(date +%s)" > "$NODE_EXPORTER_METRICS_PATH"
fi
BOOTED_SYSTEM_KERNEL="$(readlink /run/booted-system/{initrd,kernel,kernel-modules})"
ACTIVATING_SYSTEM_KERNEL="$(readlink /nix/var/nix/profiles/system/{initrd,kernel,kernel-modules})"
if [[ "$BOOTED_SYSTEM_KERNEL" != "$ACTIVATING_SYSTEM_KERNEL" ]]; then
echo "Reboot is required"
if [[ -n "$ALLOW_REBOOT" ]]; then
echo "Rebooting system now"
shutdown -r +1 "System update requires reboot"
else
echo "Automatic reboot not allowed (maybe use --allow-reboot next time)"
echo "The system upgrade is staged, please reboot manually soon"
fi
else
echo "No reboot is required"
echo "Activating system now"
/nix/var/nix/profiles/system/bin/switch-to-configuration switch
fi
echo "Finished system upgrade"