From 05393c477a2ec1bfc0ed8c6a4f8a80066f5ec81d Mon Sep 17 00:00:00 2001
From: Gregor Kleen <gkleen@yggdrasil.li>
Date: Mon, 9 Apr 2018 13:35:37 +0200
Subject: borg on odin

---
 custom/borgbackup.nix    | 30 +++++++++++++++++++++++++-----
 custom/lvm-snapshots.nix |  1 +
 2 files changed, 26 insertions(+), 5 deletions(-)

(limited to 'custom')

diff --git a/custom/borgbackup.nix b/custom/borgbackup.nix
index 91de89a5..77e7637a 100644
--- a/custom/borgbackup.nix
+++ b/custom/borgbackup.nix
@@ -5,6 +5,21 @@ with lib;
 let
   cfg = config.services.borgbackup;
 
+  lvmPath = {
+    options = {
+      LV = mkOption {
+        type = types.str;
+      };
+      VG = mkOption {
+        type = types.str;
+      };
+    };
+  };
+
+  pathType = if cfg.snapshots == "lvm" then types.submodule lvmPath else types.path;
+
+  systemdPath = path: if cfg.snapshots == "lvm" then escapeSystemdPath "${path.VG}/${path.LV}" else escapeSystemdPath path;
+
   targetOptions = {
     options = {
       repo = mkOption {
@@ -12,7 +27,7 @@ let
       };
     
       paths = mkOption {
-        type = types.listOf types.str;
+        type = types.listOf pathType;
         default = [];
       };
 
@@ -46,7 +61,7 @@ in {
   options = {
     services.borgbackup = {
       snapshots = mkOption {
-        type = types.nullOr (types.enum ["btrfs"]);
+        type = types.nullOr (types.enum ["btrfs" "lvm"]);
         default = null;
       };
 
@@ -63,8 +78,13 @@ in {
 
   config = mkIf (any (t: t.paths != []) (attrValues cfg.targets)) {
     services.btrfs-snapshots.enable = mkIf (cfg.snapshots == "btrfs") true;
+
+    services.lvm-snapshots = mkIf (cfg.snapshots == "lvm") (listToAttrs (map (path: nameValuePair (systemdPath path) {
+      inherit (path) LV VG; 
+      mountName = "snapshot-${systemdPath path}";
+    }) (unique (flatten (mapAttrsToList (target: tCfg: tCfg.paths) cfg.targets)))));
   
-    systemd.timers = (listToAttrs (map ({ target, path, tCfg }: nameValuePair "borgbackup-${target}@${path}" {
+    systemd.timers = (listToAttrs (map ({ target, path, tCfg }: nameValuePair "borgbackup-${target}@${systemdPath path}" {
       wantedBy = [ "timers.target" ];
 
       timerConfig = {
@@ -102,7 +122,7 @@ in {
             --filter 'AME' \
             --exclude-caches \
             --keep-exclude-tags \
-            --patterns-from .backup \
+            --patterns-from .backup-${target} \
             --one-file-system \
             --compression auto,lzma \
             ${tCfg.repo}::${cfg.prefix}$1-{utcnow}
@@ -133,7 +153,7 @@ in {
           --lock-wait ${toString tCfg.lockWait} \
           --list \
           --stats \
-          --prefix "${cfg.prefix}${path}" \
+          --prefix "${cfg.prefix}${escapeSystemdPath path}" \
           ${concatStringsSep " " args} \
           ${tCfg.repo}
       '') tCfg.prune);
diff --git a/custom/lvm-snapshots.nix b/custom/lvm-snapshots.nix
index 159fe98b..ea69e1ff 100644
--- a/custom/lvm-snapshots.nix
+++ b/custom/lvm-snapshots.nix
@@ -50,6 +50,7 @@ in {
 
       mountPoint = mkOption {
         type = types.path;
+        readOnly = true;
         default = "/mnt";
       };
     };
-- 
cgit v1.2.3