nix/safe-remote-upgrade.bash

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#!/usr/bin/env bash
usage() {
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echo 'usage'
echo ' safe-remote-upgrade.bash $FLAKE_REF $TARGET_HOST'
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}
error() {
echo "error: $1"
usage
}
if [[ -z $1 ]]; then
echo "error: no flake specified"
usage
exit 1
fi
flake="$1"; shift
if [[ -z $1 ]]; then
echo "error: no target host specified"
usage
exit 1
fi
target_host="$1"; shift
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set -eu
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git add -A
ssh "root@$target_host" "bash -c '
set -m
# sleep 5 mins
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echo \"Starting background reboot job...\"
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(sleep 300; reboot;) &
jobs -p
disown
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'" &
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nix run nixpkgs#nixos-rebuild -- --flake "$flake" \
--target-host "root@$target_host" test --show-trace
echo "Upgrade ready for verification. If you still have SSH access you can bail out without waiting with the following command:"
echo " ssh 'root@$target_host' nixos-rebuild --rollback switch"
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echo
echo "Waiting..."
wait
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echo 'Done!'