board/raspberrypi/post-build.sh: only tweak /etc/inittab if available

As pointed out in bug #9161, we don't always have an inittab file (if
systemd or no init is used), so the post build script should only try to
tweak it if present.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

diff --git a/board/raspberrypi/post-build.sh b/board/raspberrypi/post-build.sh
index 7eae14a885695f74bba99e24985ae9a494740766..5e5eb71100762bc1ac7755b6de4a6bef746256fc 100755 (executable)
--- a/board/raspberrypi/post-build.sh
+++ b/board/raspberrypi/post-build.sh
@@ -4,6 +4,8 @@ set -u
 set -e
 
 # Add a console on tty1
-grep -qE '^tty1::' ${TARGET_DIR}/etc/inittab || \
-sed -i '/GENERIC_SERIAL/a\
+if [ -e ${TARGET_DIR}/etc/inittab ]; then
+    grep -qE '^tty1::' ${TARGET_DIR}/etc/inittab || \
+       sed -i '/GENERIC_SERIAL/a\
 tty1::respawn:/sbin/getty -L  tty1 0 vt100 # HDMI console' ${TARGET_DIR}/etc/inittab
+fi