sysvinit-inittab: use ttyrun to run getty only if the terminal exists

Wrap calls to start_getty with ttyrun, so that getty isn't started if
the device doesn't exist.  As we know start_getty is only called when
the device exists we can remove the partial workaround for this problem
in that scripts too.

This neatly obsoletes SERIAL_CONSOLES_CHECK, whose sole purpose was to
check what terminals are present at boot and rewrite inittab.  Notably,
this meant that SERIAL_CONSOLES_CHECK made using a read-only rootfs
impossible.

(From OE-Core rev: f4fd17d5a5e4eaa31995d3ca52c871cfbdc0df68)

(From OE-Core rev: 8e48297621311116d3edd7e3aa0de1b8ef2431b1)

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-core/sysvinit/sysvinit-inittab/start_getty

@@ -1,5 +1,9 @@
 #!/bin/sh
 
+SPEED=$1
+DEVICE=$2
+TERM=$3
+
 # busybox' getty does this itself, util-linux' agetty needs extra help
 getty="/sbin/getty"
 case $(readlink -f "${getty}") in
@@ -13,9 +17,4 @@ case $(readlink -f "${getty}") in
         ;;
 esac
 
-if [ -e /sys/class/tty/$2 -a -c /dev/$2 ]; then
-	${setsid:-} ${getty} ${options:-} -L $1 $2 $3
-else
-    # Prevent respawning to fast error if /dev entry does not exist
-    sleep 1000
-fi
+${setsid:-} ${getty} ${options:-} -L $SPEED $DEVICE $TERM

meta/recipes-core/sysvinit/sysvinit-inittab_2.88dsf.bb

@@ -28,7 +28,7 @@ do_install() {
         device=$(echo $s | cut -d\; -f 2)
         label=$(echo $device | sed -e 's/tty//' | tail --bytes=5)
 
-        echo "$label:12345:respawn:${base_bindir}/start_getty $speed $device vt102" >> ${D}${sysconfdir}/inittab
+        echo "$label:12345:respawn:${sbindir}/ttyrun $device ${base_bindir}/start_getty $speed $device vt102" >> ${D}${sysconfdir}/inittab
     done
 
     if [ "${USE_VT}" = "1" ]; then
@@ -52,33 +52,6 @@ EOF
     fi
 }
 
-pkg_postinst:${PN} () {
-# run this on host and on target
-if [ "${SERIAL_CONSOLES_CHECK}" = "" ]; then
-       exit 0
-fi
-}
-
-pkg_postinst_ontarget:${PN} () {
-# run this on the target
-if [ -e /proc/consoles ]; then
-	tmp="${SERIAL_CONSOLES_CHECK}"
-	for i in $tmp
-	do
-		j=`echo ${i} | sed -e s/^.*\;//g -e s/\:.*//g`
-		k=`echo ${i} | sed s/^.*\://g`
-		if [ -z "`grep ${j} /proc/consoles`" ]; then
-			if [ -z "${k}" ] || [ -z "`grep ${k} /proc/consoles`" ] || [ ! -e /dev/${j} ]; then
-				sed -i -e /^.*${j}\ /d -e /^.*${j}$/d /etc/inittab
-			fi
-		fi
-	done
-	kill -HUP 1
-else
-	exit 1
-fi
-}
-
 # USE_VT and SERIAL_CONSOLES are generally defined by the MACHINE .conf.
 # Set PACKAGE_ARCH appropriately.
 PACKAGE_ARCH = "${MACHINE_ARCH}"
@@ -89,4 +62,5 @@ CONFFILES:${PN} = "${sysconfdir}/inittab"
 USE_VT ?= "1"
 SYSVINIT_ENABLED_GETTYS ?= "1"
 
+RDEPENDS:${PN} = "ttyrun"
 RCONFLICTS:${PN} = "busybox-inittab"