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-rw-r--r--etc/rc.d/init.d/functions5
1 files changed, 3 insertions, 2 deletions
diff --git a/etc/rc.d/init.d/functions b/etc/rc.d/init.d/functions
index dd6a3165..1473d3b0 100644
--- a/etc/rc.d/init.d/functions
+++ b/etc/rc.d/init.d/functions
@@ -84,8 +84,9 @@ if [ -z "${BOOTUP:-}" ]; then
LOGLEVEL=1
fi
- # NOTE: /dev/ttyS* is serial console.
- if tty | grep --quiet -e '/dev/ttyS'; then
+ # NOTE: /dev/ttyS* is serial console. "not a tty" is such as
+ # /dev/null associated when executed under systemd service units.
+ if LANG=C tty | grep --quiet -e '\(/dev/ttyS\|not a tty\)'; then
BOOTUP=serial
MOVE_TO_COL=
SETCOLOR_SUCCESS=