142 lines
3.4 KiB
Nix
142 lines
3.4 KiB
Nix
{
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utils,
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lib,
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...
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}:
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let
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BOOT = "/dev/disk/by-uuid/CC65-4ADF";
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PRIMARY = "/dev/disk/by-uuid/35c8b82e-de7d-45bc-9cb2-2a422a99ee9c";
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SWAP = "/dev/disk/by-uuid/85801775-1aad-4cc8-846a-560f9f4b11f4";
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primaryDeviceUnit = "${utils.escapeSystemdPath PRIMARY}.device";
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in
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lib.mkMerge [
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# Main filesystems
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{
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# BOOT
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fileSystems."/boot" = {
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device = BOOT;
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fsType = "vfat";
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options = [
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"fmask=0077"
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"dmask=0077"
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];
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};
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# PRIMARY
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fileSystems."/" = {
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device = PRIMARY;
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fsType = "bcachefs";
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options = [
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"X-mount.subdir=@root"
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];
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};
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fileSystems."/nix" = {
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device = PRIMARY;
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fsType = "bcachefs";
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options = [
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"X-mount.mkdir"
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"X-mount.subdir=@nix"
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"relatime"
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];
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};
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fileSystems."/.snapshots" = {
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device = PRIMARY;
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fsType = "bcachefs";
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options = [
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"X-mount.mkdir"
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"X-mount.subdir=@snapshots"
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"relatime"
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];
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};
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# (optional) for preservation/impermanence
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fileSystems."/persist" = {
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device = PRIMARY;
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fsType = "bcachefs";
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options = [
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"X-mount.mkdir"
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"X-mount.subdir=@persist"
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];
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neededForBoot = true; # NOTE for impermanence only
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};
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}
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# SWAP (optional)
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{ swapDevices = [ { device = SWAP; } ]; }
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{
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# Impermanence fix
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boot.initrd.systemd.services.create-needed-for-boot-dirs = {
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after = [
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"bcachefs-reset-root.service"
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];
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requires = [
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"bcachefs-reset-root.service"
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];
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serviceConfig.KeyringMode = "shared";
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};
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}
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# Reset root for erase your darlings/impermanence/preservation
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(lib.mkIf true {
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boot.initrd.systemd.services.bcachefs-reset-root = {
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description = "Reset bcachefs root subvolume before pivot";
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after = [
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"initrd-root-device.target"
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"cryptsetup.target"
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];
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requires = [
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primaryDeviceUnit
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];
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before = [
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"sysroot.mount"
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];
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wantedBy = [
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"initrd-root-fs.target"
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"sysroot.mount"
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"initrd.target"
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];
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serviceConfig = {
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Type = "oneshot";
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RemainAfterExit = true;
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KeyringMode = "shared";
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};
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script = ''
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cleanup() {
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if [[ ! -e /primary_tmp/@root ]]; then
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echo "Cleanup: Creating new @root"
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bcachefs subvolume create /primary_tmp/@root
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fi
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echo "Cleanup: Unmounting /primary_tmp"
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umount /primary_tmp || true
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}
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trap cleanup EXIT
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mkdir -p /primary_tmp
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echo "Mounting ${PRIMARY}..."
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if ! mount "${PRIMARY}" /primary_tmp; then
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echo "Mount failed. Cannot reset root."
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exit 1
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fi
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if [[ -e /primary_tmp/@root ]]; then
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mkdir -p /primary_tmp/@snapshots/old_roots
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# Use safe timestamp format (dashes instead of colons)
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timestamp=$(date "+%Y-%m-%d_%H-%M-%S")
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snap="/primary_tmp/@snapshots/old_roots/$timestamp"
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echo "Snapshotting @root to $snap"
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bcachefs subvolume snapshot /primary_tmp/@root "$snap"
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echo "Deleting current @root"
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bcachefs subvolume delete /primary_tmp/@root
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fi
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# Trap handles creating new root and unmount
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'';
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};
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})
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]
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