1 files changed, 5 insertions, 1 deletions

diff --git a/lib/mk-sandbox-system.nix b/lib/mk-sandbox-system.nix
index c24ffa0..b2d85e2 100644
--- a/lib/mk-sandbox-system.nix
+++ b/lib/mk-sandbox-system.nix
@@ -44,7 +44,7 @@ rec {
 
     virtualisation = {
       graphics = lib.mkDefault false;
-      diskImage = lib.mkDefault "$(mktemp).qcow2";
+      diskImage = lib.mkDefault "$TMP_DISK";
 
       sharedDirectories.host = {
         source = "$SHARED_CWD";
@@ -89,6 +89,10 @@ rec {
       SHARED_CWD=$PWD
       export SHARED_CWD
 
+      TMP_DISK="$(mktemp).qcow2"
+      export TMP_DISK
+      trap "rm -f \"$TMP_DISK\"" EXIT
+
       ${packages.${name}}/bin/run-${name}-vm
 
       reset