From d0d4b4fb16bea89fe1382d4fd792c1e1a6a24690 Mon Sep 17 00:00:00 2001
From: Gregor Kleen <gkleen@yggdrasil.li>
Date: Mon, 9 Apr 2018 12:46:12 +0200
Subject: =?UTF-8?q?=E2=80=A6?=
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---
 custom/lvm-snapshots.nix | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/custom/lvm-snapshots.nix b/custom/lvm-snapshots.nix
index b6527a1f..34c10460 100644
--- a/custom/lvm-snapshots.nix
+++ b/custom/lvm-snapshots.nix
@@ -68,15 +68,25 @@ in {
     systemd.services = mapAttrs' (name: scfg: nameValuePair ("lvm-snapshot@" + snapshotName name) {
       enable = true;
 
+      description = "LVM-snapshot of ${scfg.VG}/${scfg.LV}";
+
       unitConfig = {
         StopWhenUnneeded = true;
       };
 
+      path = with pkgs; [ devicemapper ];
+      
+      script = ''
+        lvcreate -s ${scfg.cowSize} --name ${snapshotName name} ${scfg.VG}/${scfg.LV}
+      '';
+
+      preStop = ''
+        lvchange -a n ${scfg.VG}/${snapshotName name}
+        lvremove ${scfg.VG}/${snapshotName name}
+      '';
+
       serviceConfig = with pkgs; {
         Type = "oneshot";
-        ExecStart = "${devicemapper}/bin/lvcreate -s ${scfg.cowSize} --name ${snapshotName name} ${scfg.VG}/${scfg.LV}";
-        ExecStopPre = "${devicemapper}/bin/lvchange -a n ${scfg.VG}/${snapshotName name}";
-        ExecStop = "${devicemapper}/bin/lvremove ${scfg.VG}/${snapshotName name}";
         RemainAfterExit = true;
       };
     }) cfg.snapshots;
-- 
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