Add btrbk

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

hosts/common/configs/system/backup/backup.completion.zsh

@@ -1,16 +0,0 @@
-_backup_completion() {
-  local options=(
-    '-m[Partition to mount for backup]:partition:($(_partitions))'
-    '-b[Backup directory]:backup directory:_files -/'
-  )
-  local curcontext="$curcontext" state line
-  typeset -A opt_args
-
-  _partitions() {
-    lsblk -rno NAME | sed 's/^/\/dev\//'
-  }
-
-  _arguments -s $options
-}
-
-compdef _backup_completion backup

hosts/common/configs/system/backup/backup.sh

@@ -1,67 +0,0 @@
-# shellcheck shell=bash
-
-if [[ "$EUID" -ne 0 ]]; then
-  echo "Please run the script as root."
-  exit 1
-fi
-
-usage() {
-  echo "Usage: $0 [-m partition] [-b backup_location]"
-  exit 1
-}
-
-cleanup() {
-  if [ -d "/persist/user.bak" ]; then btrfs -q subvolume delete "/persist/user.bak"; fi
-  if [ -n "$backup_location" ]; then rm -f "$backup_location.tmp"; fi
-
-  if [ -n "$mount_location" ]; then
-    if mount | grep -q "$mount_location"; then umount "$mount_location"; fi
-    if [ -d "$mount_location" ]; then rmdir "$mount_location"; fi
-  fi
-}
-
-partition=""
-backup_location=""
-mount_location=""
-
-trap cleanup EXIT
-
-while getopts "m:b:" opt; do
-  case "$opt" in
-    m) partition="$OPTARG" ;;
-    b) backup_location="$OPTARG" ;;
-    *) usage ;;
-  esac
-done
-
-if [ -n "$partition" ]; then
-  mkdir -p "/mnt"
-  mount_location=$(mktemp -d /mnt/backup.XXXXXX)
-  echo "Mounting $partition at $mount_location..."
-  mount "$partition" "$mount_location"
-fi
-
-if [ -z "$mount_location" ]; then
-  if [[ "$backup_location" != /* ]]; then
-    backup_location="$(realpath "$backup_location")"
-  fi
-else
-  if [[ "$backup_location" = /* ]]; then
-    echo "Error: When a partition is mounted, backup_location must be relative."
-    exit 1
-  fi
-
-  backup_location="$(realpath "$mount_location/$backup_location")"
-fi
-
-backup_location="$backup_location/$(hostname)-$(date +%Y-%m-%d-%H-%M-%S).btrfs.gz"
-
-echo "Creating /persist/user snapshot..."
-btrfs -q subvolume snapshot -r "/persist/user" "/persist/user.bak"
-
-echo "Creating backup at $backup_location..."
-btrfs -q send "/persist/user.bak" > "$backup_location.tmp"
-
-mv "$backup_location.tmp" "$backup_location"
-
-echo "Backup completed successfully!"

hosts/common/configs/system/backup/default.nix

@@ -1,18 +0,0 @@
-{ pkgs, ... }:
-{
-  environment.systemPackages = [
-    (pkgs.writeShellApplication {
-      name = "backup";
-      runtimeInputs = with pkgs; [
-        btrfs-progs
-        coreutils
-        util-linux
-      ];
-      text = builtins.readFile ./backup.sh;
-    })
-  ];
-
-  home-manager.sharedModules = [
-    { programs.zsh.initContent = builtins.readFile ./backup.completion.zsh; }
-  ];
-}

hosts/common/configs/system/btrbk/default.nix

@@ -0,0 +1,33 @@
+{ ... }:
+{
+  systemd.tmpfiles.rules = [
+    "d /persist/user.bak 0755 root root"
+    "d /persist/state.bak 0755 root root"
+  ];
+
+  services.btrbk = {
+    ioSchedulingClass = "idle";
+    niceness = 19;
+    instances = {
+      persist-user = {
+        onCalendar = "hourly";
+        settings.volume."/persist" = {
+          subvolume = "user";
+          snapshot_dir = "user.bak";
+          snapshot_preserve_min = "latest";
+          snapshot_preserve = "48h 14d 4w 6m";
+        };
+      };
+
+      persist-state = {
+        onCalendar = "daily";
+        settings.volume."/persist" = {
+          subvolume = "state";
+          snapshot_dir = "state.bak";
+          snapshot_preserve_min = "latest";
+          snapshot_preserve = "7d 4w 3m";
+        };
+      };
+    };
+  };
+}

hosts/common/configs/system/impermanence/options.nix

@@ -129,7 +129,10 @@ in
                           "directory"
                         ];
                         default = "none";
-                        description = "Whether to create the file or directory in persistence if it does not exist.";
+                        description = ''
+                          Whether to create the file or directory
+                          in persistence if it does not exist.
+                        '';
                       };
                     };
                   }

hosts/common/configs/system/impermanence/scripts/wipe.sh

@@ -13,11 +13,22 @@ mount "$DEVICE" /mnt/btrfs
 
 if [[ -e /mnt/btrfs/@ ]]; then
   mkdir -p /mnt/btrfs/@.bak
-  timestamp=$(date --date="@$(stat -c %Y /mnt/btrfs/@)" "+%Y-%m-%d_%H:%M:%S")
-  mv /mnt/btrfs/@ "/mnt/btrfs/@.bak/$timestamp"
+  timestamp=$(date --date="@$(stat -c %Y /mnt/btrfs/@)" "+%Y%m%dT%H%M")
+  base="@.$timestamp"
+
+  target="/mnt/btrfs/@.bak/$base"
+  if [[ -e "$target" ]]; then
+    i=1
+    while [[ -e "/mnt/btrfs/@.bak/${base}_$i" ]]; do
+      (( i++ ))
+    done
+    target="/mnt/btrfs/@.bak/${base}_$i"
+  fi
+
+  mv /mnt/btrfs/@ "$target"
 fi
 
-find /mnt/btrfs/@.bak/ -maxdepth 1 -mtime +14 | while IFS= read -r i; do
+find /mnt/btrfs/@.bak/ -maxdepth 1 -mtime +7 | while IFS= read -r i; do
   delete_subvolume_recursively "$i"
 done
 

hosts/elara/default.nix

@@ -8,10 +8,10 @@
 
     ./hardware
 
-    ../common/configs/system/backup
     ../common/configs/system/bluetooth
     ../common/configs/system/boot
     ../common/configs/system/brightnessctl
+    ../common/configs/system/btrbk
     ../common/configs/system/btrfs
     ../common/configs/system/cloudflared
     ../common/configs/system/cpu

hosts/elara/users/nikara/default.nix

@@ -89,7 +89,7 @@ in
     (import ./configs/gui/vscode { inherit user home; })
   ];
 
-  # echo "password" | mkpasswd -s
+  # mkpasswd -s
   sops.secrets."${user}-password" = {
     sopsFile = ../../../../secrets/sas/secrets.yaml;
     key = "password";

hosts/himalia/default.nix

@@ -6,10 +6,10 @@
 
     ./hardware
 
-    ../common/configs/system/backup
     ../common/configs/system/bluetooth
     ../common/configs/system/boot
     ../common/configs/system/brightnessctl
+    ../common/configs/system/btrbk
     ../common/configs/system/btrfs
     ../common/configs/system/cpu
     ../common/configs/system/documentation

hosts/himalia/users/nick/default.nix

@@ -89,7 +89,7 @@ in
     (import ./configs/gui/vscode { inherit user home; })
   ];
 
-  # echo "password" | mkpasswd -s
+  # mkpasswd -s
   sops.secrets."${user}-password" = {
     sopsFile = ../../../../secrets/personal/secrets.yaml;
     key = "password";

hosts/installer/users/nick/default.nix

@@ -37,7 +37,7 @@ in
     (import ./configs/console/ssh { inherit user home; })
   ];
 
-  # echo "password" | mkpasswd -s
+  # mkpasswd -s
   sops.secrets."${user}-password" = {
     sopsFile = ../../../../secrets/personal/secrets.yaml;
     key = "password";

hosts/jupiter/default.nix

@@ -8,6 +8,7 @@
 
     ../common/configs/system/boot
     ../common/configs/system/brightnessctl
+    ../common/configs/system/btrbk
     ../common/configs/system/btrfs
     ../common/configs/system/cpu
     ../common/configs/system/documentation

hosts/jupiter/users/nick/default.nix

@@ -35,7 +35,7 @@ in
     (import ./configs/console/podman { inherit user home; })
   ];
 
-  # echo "password" | mkpasswd -s
+  # mkpasswd -s
   sops.secrets."${user}-password" = {
     sopsFile = ../../../../secrets/personal/secrets.yaml;
     key = "password";

hosts/jupiter/users/storm/default.nix

@@ -19,7 +19,7 @@ in
     (import ./configs/console/podman { inherit user home; })
   ];
 
-  # echo "password" | mkpasswd -s
+  # mkpasswd -s
   sops.secrets."${user}-password" = {
     sopsFile = ../../../../secrets/personal/secrets.yaml;
     key = "password";