Alert properly when we have stale mounts left after interupting

a tinybsd build.  If we do not do this, we can accidentally remove
critical files from directories like /lib (if mounted).

PR:		misc/121763
Submitted by:	Richard Arends < richard at unixguru dot nl >
MFC after:	3 days

1 files changed, 14 insertions, 6 deletions

diff --git a/tools/tools/tinybsd/tinybsd b/tools/tools/tinybsd/tinybsd
index 7f368bb0b77c..912a7974ac96 100755
--- a/tools/tools/tinybsd/tinybsd
+++ b/tools/tools/tinybsd/tinybsd
@@ -248,12 +248,20 @@ rotate_buidlog() {
 }
 
 remove_workdir() {
-	chflags -R noschg ${WORKDIR}
-	echo "${TS} Removing "${WORKDIR}
-	rm -rf ${WORKDIR}
-	echo "${TS} Removing Build Kernel Directory"
-	rm -rf /usr/obj/usr/src/sys/${KERNCONF}
-	echo "${TS}  done."
+	# Before removing check if there is not a mount under $WORKDIR anymore
+	MOUNT_CHECK=`mount|egrep "on ${WORKDIR}"`
+
+	if [ ! -z "${MOUNT_CHECK}" ]; then
+		echo "There are mounts under the workdir (${WORKDIR}). Please umount them before running this script"
+		exit 1
+	else
+		chflags -R noschg ${WORKDIR}
+		echo "${TS} Removing "${WORKDIR}
+		rm -rf ${WORKDIR}
+		echo "${TS} Removing Build Kernel Directory"
+		rm -rf /usr/obj/usr/src/sys/${KERNCONF}
+		echo "${TS}  done."
+	fi
 }