explicitly detach loop device on umount

I see cases where a stale loop device stays around and fills up my
partition as image file is still in use and does not get unlinked.

Explicitly detach loop device on umount to fix that.

Signed-off-by: Christian Hesse <mail@eworm.de>

1 files changed, 1 insertions, 1 deletions

diff --git a/configs/releng/build.sh b/configs/releng/build.sh
index 5590163..86cdb08 100755
--- a/configs/releng/build.sh
+++ b/configs/releng/build.sh
@@ -190,7 +190,7 @@ make_efiboot() {
     cp ${work_dir}/iso/EFI/shellx64_v2.efi ${work_dir}/efiboot/EFI/
     cp ${work_dir}/iso/EFI/shellx64_v1.efi ${work_dir}/efiboot/EFI/
 
-    umount ${work_dir}/efiboot
+    umount -d ${work_dir}/efiboot
 }
 
 # Build airootfs filesystem image