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Merge pull request #77622 from R-VdP/nixos-upgrade-reboot-window

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NixOS/auto-upgrade: offer the possibility to define a reboot window during which the system may be automatically rebooted
This commit is contained in:
Silvan Mosberger 2022-03-17 23:50:53 +01:00 committed by GitHub
commit 839b9b8ddc
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1 changed files with 71 additions and 12 deletions
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83
nixos/modules/tasks/auto-upgrade.nix
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@ -80,6 +80,7 @@ in {
Reboot the system into the new generation instead of a switch
if the new generation uses a different kernel, kernel modules
or initrd than the booted system.
See <option>rebootWindow</option> for configuring the times at which a reboot is allowed.
'';
};
@ -96,6 +97,32 @@ in {
'';
};
rebootWindow = mkOption {
description = ''
Define a lower and upper time value (in HH:MM format) which
constitute a time window during which reboots are allowed after an upgrade.
This option only has an effect when <option>allowReboot</option> is enabled.
The default value of <literal>null</literal> means that reboots are allowed at any time.
'';
default = null;
example = { lower = "01:00"; upper = "05:00"; };
type = with types; nullOr (submodule {
options = {
lower = mkOption {
description = "Lower limit of the reboot window";
type = types.strMatching "[[:digit:]]{2}:[[:digit:]]{2}";
example = "01:00";
};
upper = mkOption {
description = "Upper limit of the reboot window";
type = types.strMatching "[[:digit:]]{2}:[[:digit:]]{2}";
example = "05:00";
};
};
});
};
};
};
@ -110,12 +137,10 @@ in {
}];
system.autoUpgrade.flags = (if cfg.flake == null then
[ "--no-build-output" ] ++ (if cfg.channel == null then
[ "--upgrade" ]
else [
[ "--no-build-output" ] ++ optionals (cfg.channel != null) [
"-I"
"nixpkgs=${cfg.channel}/nixexprs.tar.xz"
])
]
else
[ "--flake ${cfg.flake}" ]);
@ -143,19 +168,52 @@ in {
];
script = let
nixos-rebuild =
"${config.system.build.nixos-rebuild}/bin/nixos-rebuild";
nixos-rebuild = "${config.system.build.nixos-rebuild}/bin/nixos-rebuild";
date = "${pkgs.coreutils}/bin/date";
readlink = "${pkgs.coreutils}/bin/readlink";
shutdown = "${pkgs.systemd}/bin/shutdown";
upgradeFlag = optional (cfg.channel == null) "--upgrade";
in if cfg.allowReboot then ''
${nixos-rebuild} boot ${toString cfg.flags}
booted="$(readlink /run/booted-system/{initrd,kernel,kernel-modules})"
built="$(readlink /nix/var/nix/profiles/system/{initrd,kernel,kernel-modules})"
if [ "$booted" = "$built" ]; then
${nixos-rebuild} boot ${toString (cfg.flags ++ upgradeFlag)}
booted="$(${readlink} /run/booted-system/{initrd,kernel,kernel-modules})"
built="$(${readlink} /nix/var/nix/profiles/system/{initrd,kernel,kernel-modules})"
${optionalString (cfg.rebootWindow != null) ''
current_time="$(${date} +%H:%M)"
lower="${cfg.rebootWindow.lower}"
upper="${cfg.rebootWindow.upper}"
if [[ "''${lower}" < "''${upper}" ]]; then
if [[ "''${current_time}" > "''${lower}" ]] && \
[[ "''${current_time}" < "''${upper}" ]]; then
do_reboot="true"
else
do_reboot="false"
fi
else
# lower > upper, so we are crossing midnight (e.g. lower=23h, upper=6h)
# we want to reboot if cur > 23h or cur < 6h
if [[ "''${current_time}" < "''${upper}" ]] || \
[[ "''${current_time}" > "''${lower}" ]]; then
do_reboot="true"
else
do_reboot="false"
fi
fi
''}
if [ "''${booted}" = "''${built}" ]; then
${nixos-rebuild} switch ${toString cfg.flags}
${optionalString (cfg.rebootWindow != null) ''
elif [ "''${do_reboot}" != true ]; then
echo "Outside of configured reboot window, skipping."
''}
else
/run/current-system/sw/bin/shutdown -r +1
${shutdown} -r +1
fi
'' else ''
${nixos-rebuild} switch ${toString cfg.flags}
${nixos-rebuild} switch ${toString (cfg.flags ++ upgradeFlag)}
'';
startAt = cfg.dates;
@ -167,3 +225,4 @@ in {
};
}