1 files changed, 1 insertions, 0 deletions

diff --git a/fsmgr.hs b/fsmgr.hs
index 890064d..f715d3e 100644
--- a/fsmgr.hs
+++ b/fsmgr.hs
@@ -467,6 +467,7 @@ shakeRules = do
         inp = dropExtension out -<.> ".btrfs"
     need [inp]
     cmd_ "cp --reflink=always" [inp, tmp]
+    setupLoopDevices ("_build" </> inp <.> "btrfs")
     cmd_ "btrfs-shrink" [tmp]
     cmd_ "btrfstune -f -S1" [tmp]
     cmd_ (WithStderr False) "mv -i" [tmp, out]