miniprokit.sh: Improve umount kludge.

1 files changed, 8 insertions, 4 deletions

diff --git a/miniprokit.sh b/miniprokit.sh
index b911f3c..8e8af01 100755
--- a/miniprokit.sh
+++ b/miniprokit.sh
@@ -324,16 +324,20 @@ cmd_shell()
 
 	chroot "${root}" /bin/sh
 	printf '\nExiting...\n'
-	# umount sometimes complains that ${root}/dev is busy.  Here's a kludge
-	# to try to avoid that.
-	sleep 1
 
 	case "$(cat "${root}/etc/proteanos_arch")" in
 		*'-linux-'*)
 			umount "${root}/dev/pts"
 			umount "${root}/proc"
 			umount "${root}/sys"
-			umount "${root}/dev"
+			while ! umount "${root}/dev"; do
+				# umount sometimes complains that ${root}/dev is
+				# busy.  Here's a kludge to try to handle that.
+				# This is a bind mount, so we better make sure
+				# it gets unmounted; otherwise, `rm -Rf ${root}`
+				# can be painful.
+				sleep 1
+			done
 			;;
 	esac
 }