From ea9d42b778ccc1cb41ff25144f2d62ca8c119639 Mon Sep 17 00:00:00 2001
From: Colin <colin@uninsane.org>
Date: Sun, 19 Jan 2025 08:18:12 +0000
Subject: [PATCH] snapper: enable for ALL hosts

---
 hosts/by-name/desko/default.nix | 27 ---------------------------
 hosts/common/default.nix        |  1 +
 hosts/common/snapper.nix        | 29 +++++++++++++++++++++++++++++
 3 files changed, 30 insertions(+), 27 deletions(-)
 create mode 100644 hosts/common/snapper.nix

diff --git a/hosts/by-name/desko/default.nix b/hosts/by-name/desko/default.nix
index 7407fb8f0..54432e2f3 100644
--- a/hosts/by-name/desko/default.nix
+++ b/hosts/by-name/desko/default.nix
@@ -53,31 +53,4 @@
 
   # TODO(2025-01-01): re-enable once rocm build is fixed: <https://github.com/NixOS/nixpkgs/pull/367695>
   # hardware.amdgpu.opencl.enable = true;  # desktop (AMD's opencl implementation AKA "ROCM"); probably required for ollama
-
-  # snapper: btrfs auto-snapshots:
-  # - <https://wiki.archlinux.org/title/Snapper>
-  # - `man snapper-configs`
-  #
-  # to list snapshots: `snapper list`
-  # to take a snapshot: `snapper create`  or `systemctl start snapper-timeline.service`
-  #
-  # FIRST TIME SETUP:
-  # - `sudo btrfs subvolume create /nix/persist`
-  #   - if migrating from a non-subvol `/nix/persist`, then:
-  #     - `sudo btrfs subvolume create /nix/persist.new`
-  #     - `sudo cp --archive --one-file-system --reflink=always /nix/persist/. /nix/persist.new`
-  #     - `sudo bash -c 'mv /nix/persist /nix/persist.old && mv /nix/persist.new /nix/persist`
-  # - `sudo btrfs subvolume create /nix/persist/.snapshots`
-  # - reboot (else all snapper calls will fail due to dbus errors)
-  services.snapper.configs.root = {
-    SUBVOLUME = "/nix/persist";
-    ALLOW_USERS = [ "colin" ];
-    TIMELINE_CLEANUP = true;  # remove old snapshots every 24h
-    TIMELINE_CREATE = true;  # take a snapshot every hour
-    TIMELINE_LIMIT_HOURLY = 12;
-    TIMELINE_LIMIT_DAILY = 7;  # keep snapshots for 1d ago, 2d ago, ... 7day ago
-    TIMELINE_LIMIT_WEEKLY = 4;  # keep snapshots for 7d ago, 14d ago, 21d ago, 28d ago
-    TIMELINE_LIMIT_MONTHLY = 0;
-    TIMELINE_LIMIT_YEARLY = 0;
-  };
 }
diff --git a/hosts/common/default.nix b/hosts/common/default.nix
index 1dcf36912..0bfb1f911 100644
--- a/hosts/common/default.nix
+++ b/hosts/common/default.nix
@@ -14,6 +14,7 @@
     ./programs
     ./quirks.nix
     ./secrets.nix
+    ./snapper.nix
     ./ssh.nix
     ./systemd.nix
     ./users
diff --git a/hosts/common/snapper.nix b/hosts/common/snapper.nix
new file mode 100644
index 000000000..b3d8432b9
--- /dev/null
+++ b/hosts/common/snapper.nix
@@ -0,0 +1,29 @@
+{ ... }:
+{
+  # snapper: btrfs auto-snapshots:
+  # - <https://wiki.archlinux.org/title/Snapper>
+  # - `man snapper-configs`
+  #
+  # to list snapshots: `snapper list`
+  # to take a snapshot: `snapper create`  or `systemctl start snapper-timeline.service`
+  #
+  # FIRST TIME SETUP:
+  # - `sudo btrfs subvolume create /nix/persist`
+  #   - if migrating from a non-subvol `/nix/persist`, then:
+  #     - `sudo btrfs subvolume create /nix/persist.new`
+  #     - `sudo cp --archive --one-file-system --reflink=always /nix/persist/. /nix/persist.new`
+  #     - `sudo bash -c 'mv /nix/persist /nix/persist.old && mv /nix/persist.new /nix/persist`
+  # - `sudo btrfs subvolume create /nix/persist/.snapshots`
+  # - reboot (else all snapper calls will fail due to dbus errors)
+  services.snapper.configs.root = {
+    SUBVOLUME = "/nix/persist";
+    ALLOW_USERS = [ "colin" ];
+    TIMELINE_CLEANUP = true;  # remove old snapshots every 24h
+    TIMELINE_CREATE = true;  # take a snapshot every hour
+    TIMELINE_LIMIT_HOURLY = 12;
+    TIMELINE_LIMIT_DAILY = 7;  # keep snapshots for 1d ago, 2d ago, ... 7day ago
+    TIMELINE_LIMIT_WEEKLY = 4;  # keep snapshots for 7d ago, 14d ago, 21d ago, 28d ago
+    TIMELINE_LIMIT_MONTHLY = 0;
+    TIMELINE_LIMIT_YEARLY = 0;
+  };
+}