/usr/share/initramfs-tools/scripts/casper-bottom/26serialtty is in casper 1.340.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 | #! /bin/sh
PREREQ=""
DESCRIPTION="Setting up a serial tty..."
prereqs()
{
echo "$PREREQ"
}
case $1 in
# get pre-requisites
prereqs)
prereqs
exit 0
;;
esac
. /scripts/casper-functions
for x in $(cat /proc/cmdline); do
case $x in
serialtty=*)
tty=${x#serialtty=}
log_begin_msg "$DESCRIPTION"
cat > /root/etc/init/${tty}.conf <<EOF
start on stopped rc RUNLEVEL=[2345]
stop on runlevel [!2345]
respawn
exec /sbin/getty -L 115200 ${tty} vt100
EOF
log_end_msg
;;
esac
done
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