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test: impermanence

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Nick 2025-11-05 00:04:49 -06:00
parent 4210004147
commit 270275e225
1 changed files with 26 additions and 31 deletions
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57
systems/ceres/config/filesystem.nix
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@ -12,35 +12,24 @@ in
"/" = {
device = "/dev/disk/by-label/root";
fsType = "btrfs";
options = [
"subvol=@"
"compress=zstd"
"noatime"
];
options = [ "subvol=root" ];
};
"/nix" = {
device = "/dev/disk/by-label/root";
fsType = "btrfs";
options = [
"subvol=@nix"
];
options = [ "subvol=nix" ];
};
"/persistent" = {
device = "/dev/disk/by-label/root";
fsType = "btrfs";
neededForBoot = true;
options = [
"subvol=@persistent"
];
options = [ "subvol=persistent" ];
};
"/boot" = {
device = "/dev/disk/by-label/BOOT";
fsType = "vfat";
options = [ "umask=0077" ];
};
"/mnt/storage" = {
device = "/dev/disk/by-label/storage";
fsType = "ext4";
@ -49,12 +38,12 @@ in
boot.initrd.postResumeCommands = lib.mkAfter ''
mkdir -p /btrfs_tmp
mount -o subvol=/ /dev/disk/by-label/root /btrfs_tmp
mount -o subvolid=5 /dev/disk/by-label/root /btrfs_tmp
if [[ -e /btrfs_tmp/@ ]]; then
mkdir -p /btrfs_tmp/@old_roots
timestamp=$(date --date="@$(stat -c %Y /btrfs_tmp/@)" "+%Y-%m-%d_%H:%M:%S")
mv /btrfs_tmp/@ "/btrfs_tmp/@old_roots/$timestamp"
if [[ -e /btrfs_tmp/root ]]; then
mkdir -p /btrfs_tmp/old_roots
timestamp=$(date --date="@$(stat -c %Y /btrfs_tmp/root)" "+%Y-%m-%d_%H:%M:%S")
mv /btrfs_tmp/root "/btrfs_tmp/old_roots/$timestamp"
fi
delete_subvolume_recursively() {
@ -65,29 +54,35 @@ in
btrfs subvolume delete "$1"
}
for i in $(find /btrfs_tmp/@old_roots/ -maxdepth 1 -mtime +30); do
for i in $(find /btrfs_tmp/old_roots/ -maxdepth 1 -mtime +30); do
delete_subvolume_recursively "$i"
done
btrfs subvolume create /btrfs_tmp/@
btrfs subvolume create /btrfs_tmp/root
umount /btrfs_tmp
'';
environment.persistence."/persistent" = {
hideMounts = true;
directories = [
"/var/log"
"/var/lib/nixos"
"/var/lib/systemd/coredump"
"/var/cache"
"/etc/ssh"
];
files = [
"/etc/machine-id"
"/var/lib"
{
directory = "/etc/ssh";
mode = "u=rwx,g=rx,o=rx";
user = "root";
}
];
hideMounts = true;
users.${user0} = {
directories = [
".ssh"
".cache"
".config"
".local/share/direnv"
".local/state/nix"
{
directory = ".ssh";
mode = "u=rwx,g=,o=";
}
];
};
};