Assert that /dev/null is a character device in a chroot early. Otherwise,

we might get surprises later, like /dev/null having error in the 4th line
reported by make(1).  :-)

Tested by:	Dmitriy Kirhlarov (who attempted to make release in a jail)

1 files changed, 4 insertions, 0 deletions

diff --git a/release/Makefile b/release/Makefile
index 9bad024..559b32b 100644
--- a/release/Makefile
+++ b/release/Makefile
@@ -512,6 +512,10 @@ release rerelease:
 	# NB: these may fail if the host is running w/o devfs
 	echo "umount /dev >/dev/null 2>&1 || true" >> ${_MK}
 	echo "mount -t devfs devfs /dev >/dev/null 2>&1 || true"	>> ${_MK}
+	echo "if [ ! -c /dev/null ]; then" >> ${_MK}
+	echo "	echo /dev/null is not a device!" >> ${_MK}
+	echo "	exit 1" >> ${_MK}
+	echo "fi" >> ${_MK}
 	echo "if [ -x /etc/rc.d/ldconfig ]; then" >> ${_MK}
 	echo "	/etc/rc.d/ldconfig start"	>> ${_MK}
 	echo "else"				>> ${_MK}