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https://gitlab.com/simple-nixos-mailserver/nixos-mailserver.git
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46 lines
1.9 KiB
Nix
46 lines
1.9 KiB
Nix
# nixos-mailserver: a simple mail server
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# Copyright (C) 2016-2018 Robin Raymond
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>
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{ config, pkgs, lib, ... }:
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with lib;
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let
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cfg = config.mailserver;
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in
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{
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config = mkIf cfg.rebootAfterKernelUpgrade.enable {
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systemd.services.nixos-upgrade.serviceConfig.ExecStartPost = pkgs.writeScript "post-upgrade-check" ''
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#!${pkgs.stdenv.shell}
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# Checks whether the "current" kernel is different from the booted kernel
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# and then triggers a reboot so that the "current" kernel will be the booted one.
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# This is just an educated guess. If the links do not differ the kernels might still be different, according to spacefrogg in #nixos.
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current=$(readlink -f /run/current-system/kernel)
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booted=$(readlink -f /run/booted-system/kernel)
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if [ "$current" == "$booted" ]; then
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echo "kernel version seems unchanged, skipping reboot" | systemd-cat --priority 4 --identifier "post-upgrade-check";
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else
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echo "kernel path changed, possibly a new version" | systemd-cat --priority 2 --identifier "post-upgrade-check"
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echo "$booted" | systemd-cat --priority 2 --identifier "post-upgrade-kernel-check"
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echo "$current" | systemd-cat --priority 2 --identifier "post-upgrade-kernel-check"
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${cfg.rebootAfterKernelUpgrade.method}
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fi
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'';
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};
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}
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