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Make rollback datasets configurable.

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This commit is contained in:
Tom Alexander 2025-11-24 20:14:45 -05:00
parent c542dcdee9
commit 606b952304
Signed by: talexander
GPG Key ID: 36C99E8B3C39D85F
4 changed files with 43 additions and 6 deletions
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5
nix/configuration/hosts/odo/default.nix
View File

@ -32,6 +32,11 @@
boot.loader.generic-extlinux-compatible.enable = true;
boot.loader.systemd-boot.enable = lib.mkForce false;
me.rollback.dataset = [
"zroot/linux/nix/root@blank"
"zroot/linux/nix/home@blank"
];
me.optimizations = {
enable = true;
arch = "znver4";

5
nix/configuration/hosts/odowork/default.nix
View File

@ -33,6 +33,11 @@
boot.loader.generic-extlinux-compatible.enable = true;
boot.loader.systemd-boot.enable = lib.mkForce false;
me.rollback.dataset = [
"zroot/linux/nixwork/root@blank"
"zroot/linux/nixwork/home@blank"
];
me.optimizations = {
enable = true;
arch = "znver4";

5
nix/configuration/hosts/quark/default.nix
View File

@ -30,6 +30,11 @@
boot.loader.generic-extlinux-compatible.enable = true;
boot.loader.systemd-boot.enable = lib.mkForce false;
me.rollback.dataset = [
"zroot/linux/nix/root@blank"
"zroot/linux/nix/home@blank"
];
me.optimizations = {
enable = true;
arch = "znver4";

34
nix/configuration/roles/boot/default.nix
View File

@ -23,6 +23,27 @@
example = true;
description = "Enable to use secure boot.";
};
rollback.enable = lib.mkOption {
type = lib.types.bool;
default = true;
example = true;
description = "Whether we want to enable rolling back during boot.";
};
rollback.dataset = lib.mkOption {
default = { };
example = lib.literalExpression ''
{
"zroot/linux/nix/root@blank" = true;
"zroot/linux/nix/home@blank" = lib.mkForce false;
}
'';
type = lib.types.coercedTo (lib.types.listOf lib.types.str) (
enabled: lib.listToAttrs (map (fs: lib.nameValuePair fs true) enabled)
) (lib.types.attrsOf lib.types.bool);
description = "List of ZFS datasets to rollback to during boot.";
};
};
config = lib.mkIf config.me.boot.enable (
@ -51,7 +72,7 @@
# Check what will be lost with `zfs diff zroot/linux/root@blank`
boot.initrd.systemd.enable = lib.mkDefault true;
boot.initrd.systemd.services.zfs-rollback = {
boot.initrd.systemd.services.zfs-rollback = lib.mkIf config.me.rollback.enable {
description = "Rollback ZFS root dataset to blank snapshot";
wantedBy = [
"initrd.target"
@ -64,11 +85,12 @@
];
unitConfig.DefaultDependencies = "no";
serviceConfig.Type = "oneshot";
script = ''
${config.boot.zfs.package}/sbin/zfs rollback -r zroot/linux/nix/root@blank
${config.boot.zfs.package}/sbin/zfs rollback -r zroot/linux/nix/home@blank
echo "rollback complete"
'';
script = lib.concatStringsSep "\n" (
(builtins.map (ds: "${config.boot.zfs.package}/sbin/zfs rollback -r '${ds}'") (
builtins.attrNames config.me.rollback.dataset
))
++ [ ''echo "rollback complete"'' ]
);
};
# boot.loader.systemd-boot.extraEntries = {