try root reset
This commit is contained in:
RingOfStorms (Joshua Bell)
parent
55fe33f0b4
commit
d3d4ccf9d6
2 changed files with 106 additions and 37 deletions
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@ -138,8 +138,8 @@ lib.mkMerge [
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# Make this part of the root-fs chain, not just initrd.target
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wantedBy = [
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# "initrd.target"
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# "sysroot.mount"
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# "initrd-root-fs.target"
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"sysroot.mount"
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"initrd-root-fs.target"
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];
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before = [
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"sysroot.mount"
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@ -148,7 +148,7 @@ lib.mkMerge [
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after = [
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# "usb_key.mount"
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# "initrd-root-device.target"
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"initrd-root-device.target"
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];
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requires = [
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"initrd-root-device.target"
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@ -225,7 +225,7 @@ lib.mkMerge [
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# TODO rotate root
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}
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# Reset root for erase your darlings/impermanence/preservation
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(lib.mkIf false {
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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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@ -263,6 +263,7 @@ lib.mkMerge [
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pkgs.coreutils
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pkgs.util-linux
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pkgs.findutils
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pkgs.gawk
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pkgs.bcachefs-tools
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]
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}:/bin:/sbin";
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@ -270,15 +271,18 @@ lib.mkMerge [
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script = ''
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# 1. Enable Debugging
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# This will print every command to the journal so you can see exactly where it fails
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# View logs with: journalctl -u bcachefs-reset-root -b
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set -x
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# 2. Define Cleanup Trap
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# This guarantees unmount runs even if the script crashes or fails halfway
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# 2. Define Cleanup Trap (Robust)
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cleanup() {
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if mountpoint -q /primary_tmp; then
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echo "Cleaning up: Unmounting /primary_tmp"
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# If the script failed before creating the new root, make sure we create it
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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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# Robust replacement for 'mountpoint -q'
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if grep -qs "/primary_tmp " /proc/mounts; then
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echo "Cleanup: Unmounting /primary_tmp"
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umount /primary_tmp
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fi
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}
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@ -286,39 +290,85 @@ lib.mkMerge [
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mkdir -p /primary_tmp
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# 3. Mount
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# If this fails, we exit 0 to allow the boot to proceed (skipping reset)
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# If unlocked, mounts instantly. If locked, prompts for password on TTY.
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echo "Mounting ${PRIMARY}..."
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if ! mount "${PRIMARY}" /primary_tmp; then
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echo "Failed to mount ${PRIMARY}. Drive locked or unavailable."
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exit 0
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echo "Mount failed. Cannot reset root."
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exit 1
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fi
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# 4. Reset Logic
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# 5. Snapshot & Prune Logic
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if [[ -e /primary_tmp/@root ]]; then
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# Ensure parent dirs exist
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mkdir -p /primary_tmp/@snapshots/old_roots
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# Use safe date format (underscores instead of colons) to avoid filesystem quirks
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timestamp=$(date --date="@$(stat -c %Y /primary_tmp/@root)" "+%Y-%m-%d_%H-%M-%S")
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echo "Snapshotting @root to @snapshots/old_roots/$timestamp"
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bcachefs subvolume snapshot /primary_tmp/@root "/primary_tmp/@snapshots/old_roots/$timestamp"
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echo "Deleting current @root"
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bcachefs subvolume delete /primary_tmp/@root
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# Cleanup old snapshots (>30 days)
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# We use 'find' with -print0 and 'xargs -0 -r' to handle filenames safely
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echo "Pruning old snapshots..."
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find /primary_tmp/@snapshots/old_roots/ -maxdepth 1 -mtime +30 -print0 | \
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xargs -0 -r -I {} sh -c 'echo "Deleting {}"; bcachefs subvolume delete "{}"'
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mkdir -p /primary_tmp/@snapshots/old_roots
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# Use safe timestamp format (dashes instead of colons)
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timestamp=$(date --date="@$(stat -c %Y /primary_tmp/@root)" "+%Y-%m-%d_%H-%M-%S")
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echo "Snapshotting @root to .../$timestamp"
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bcachefs subvolume snapshot /primary_tmp/@root "/primary_tmp/@snapshots/old_roots/$timestamp"
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echo "Deleting current @root"
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bcachefs subvolume delete /primary_tmp/@root
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# --- PRUNING LOGIC ---
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echo "Pruning snapshots..."
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# Get list of snapshots sorted by name (which effectively sorts by date: YYYY-MM-DD...)
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# ls -r puts newest first
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snapshots=$(ls -1r /primary_tmp/@snapshots/old_roots | grep -E '^[0-9]{4}-[0-9]{2}-[0-9]{2}')
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declare -A kept_weeks
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declare -A kept_months
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processed_count=0
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for snap in $snapshots; do
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keep=false
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# Parse date from filename (Replace _ with space for date command)
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date_str=$(echo "$snap" | sed 's/_/ /')
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# Get metadata
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ts=$(date -d "$date_str" +%s)
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week_id=$(date -d "$date_str" +%Y-W%U)
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month_id=$(date -d "$date_str" +%Y-%m)
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now=$(date +%s)
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days_old=$(( (now - ts) / 86400 ))
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# RULE 1: Keep 5 most recent (Always)
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if [ $processed_count -lt 5 ]; then
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keep=true
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fi
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# RULE 2: Weekly for last month (Age < 32 days)
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# "at least 1 root from each week from the last month"
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if [ $days_old -le 32 ]; then
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if [ -z "''${kept_weeks[$week_id]}" ]; then
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keep=true
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kept_weeks[$week_id]=1
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fi
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fi
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# RULE 3: Monthly for older snapshots
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# "at least 1 root from a month ago" (implies monthly retention indefinitely)
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if [ $days_old -gt 32 ]; then
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if [ -z "''${kept_months[$month_id]}" ]; then
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keep=true
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kept_months[$month_id]=1
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fi
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fi
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if [ "$keep" = true ]; then
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echo "Keeping: $snap"
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else
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echo "Deleting: $snap"
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bcachefs subvolume delete "/primary_tmp/@snapshots/old_roots/$snap"
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fi
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processed_count=$((processed_count + 1))
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done
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fi
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# 5. Create Fresh Root
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echo "Creating empty @root subvolume"
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bcachefs subvolume create /primary_tmp/@root
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# Trap will handle the unmount automatically on exit
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# Trap handles creating new root and unmount
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'';
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};
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})
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@ -122,3 +122,22 @@ echo "test" > /usb_key/key
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umount /usb_key && rmdir /usb_key
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```
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## TODO remove notes
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```sh
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BOOT=sda1
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PRIMARY=sda2
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SWAP=sda3
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swapon /dev/$SWAP
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keyctl link @u @s
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DEV_B="/dev/disk/by-uuid/"$(lsblk -o name,uuid | grep $BOOT | awk '{print $2}')
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DEV_P="/dev/disk/by-uuid/"$(lsblk -o name,uuid | grep $PRIMARY | awk '{print $2}')
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mount -t bcachefs -o X-mount.subdir=@root $DEV_P /mnt
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mount -t vfat $DEV_B /mnt/boot --mkdir
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mount -t bcachefs -o X-mount.mkdir,X-mount.subdir=@nix,relatime $DEV_P /mnt/nix
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mount -t bcachefs -o X-mount.mkdir,X-mount.subdir=@snapshots,relatime $DEV_P /mnt/.snapshots
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mount -t bcachefs -o X-mount.mkdir,X-mount.subdir=@persist $DEV_P /mnt/persist
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nixos-install --flake "git+https://git.joshuabell.xyz/ringofstorms/dotfiles?dir=hosts/i001#i001"
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```
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