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andromeda
2026-04-19 12:15:31 +02:00
parent d2ea8ab074
commit 2783860e4e
4 changed files with 119 additions and 110 deletions
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88
modules/nixos/machines/lenovo.nix
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@@ -17,36 +17,70 @@
options = ["subvol=root"];
};
boot.initrd.postResumeCommands = lib.mkAfter ''
mkdir /btrfs_tmp
mount ${config.fileSystems."/".device} /btrfs_tmp
if [[ -e /btrfs_tmp/root ]]; then
mkdir -p /btrfs_tmp/old_roots
timestamp=$(date --date="@$(stat -c %Y /btrfs_tmp/root)" "+%Y-%m-%-d_%H:$M:%S")
mv /btrfs_tmp/root "/btrfs_tmp/old_roots/$timestamp"
fi
boot.initrd.systemd = {
services.impermanent-btrfs = {
description = "saves old root and makes new one";
unitConfig.DefaultDependencies = false;
serviceConfig = {
Type = "oneshot";
StandardOutput = "journal+console";
StandardError = "journal+console";
};
requiredBy = [
"initrd.target"
];
before = [
"sysroot.mount"
];
requires = [
"initrd-root-device.target"
];
after = [
"initrd-root-device.target"
"local-fs-pre.target"
];
script = ''
mkdir /btrfs_tmp
mount ${config.fileSystems."/".device} /btrfs_tmp
if [[ -e /btrfs_tmp/root ]]; then
mkdir -p /btrfs_tmp/old_roots
timestamp=$(date --date="@$(stat -c %Y /btrfs_tmp/root)" "+%Y-%m-%-d_%H:$M:%S")
mv /btrfs_tmp/root "/btrfs_tmp/old_roots/$timestamp"
fi
delete_subvolume_recursively() {
IFS=$'\n'
for i in $(btrfs subvolume list -o "$1" | cut -f 9- -d ' '); do
delete_subvolume_recursively "/btrfs_tmp/$i"
done
btrfs subvolume delete "$1"
}
delete_subvolume_recursively() {
IFS=$'\n'
for i in $(btrfs subvolume list -o "$1" | cut -f 9- -d ' '); do
delete_subvolume_recursively "/btrfs_tmp/$i"
done
btrfs subvolume delete "$1"
}
for i in $(find /btrfs_tmp/old_roots/ -maxdepth 1 -mtime +30); do
delete_subvolume_recursively "$i"
done
for i in $(find /btrfs_tmp/old_roots/ -maxdepth 1 -mtime +30); do
delete_subvolume_recursively "$i"
done
btrfs subvolume create /btrfs_tmp/root
mkdir /btrfs_tmp/root/persist
mkdir /btrfs_tmp/root/etc
mount ${config.fileSystems."/persist".device} /btrfs_tmp/root/persist -o subvol=persist
cp /btrfs_tmp/root/persist/etc/ssh /btrfs_tmp/root/etc/ssh -r
umount /btrfs_tmp/root/persist
rm -r /btrfs_tmp/root/persist
umount /btrfs_tmp
'';
btrfs subvolume create /btrfs_tmp/root
mkdir /btrfs_tmp/root/persist
mkdir /btrfs_tmp/root/etc
mount ${config.fileSystems."/persist".device} /btrfs_tmp/root/persist -o subvol=persist
cp /btrfs_tmp/root/persist/etc/ssh /btrfs_tmp/root/etc/ssh -r
umount /btrfs_tmp/root/persist
rm -r /btrfs_tmp/root/persist
umount /btrfs_tmp
'';
};
extraBin = {
"mkdir" = "${pkgs.coreutils}/bin/mkdir";
"date" = "${pkgs.coreutils}/bin/date";
"stat" = "${pkgs.coreutils}/bin/stat";
"mv" = "${pkgs.coreutils}/bin/mv";
"cp" = "${pkgs.coreutils}/bin/cp";
"rm" = "${pkgs.coreutils}/bin/rm";
"btrfs" = "${pkgs.btrfs-progs}/bin/btrfs";
# find, mount, umount already there
};
};
fileSystems."/nix" = {
device = "/dev/disk/by-uuid/0e586651-36f4-42b0-99b3-3f0704a894d6";