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init: setup serial login in inittab if console=ttyS*

--- a/initramfs-init.in

+++ b/initramfs-init.in

@@ -147,6 +147,17 @@

 	done

 }

+setup_inittab_serial(){

+	local tty=$1

+	local speed=$2

+

+	# do nothing if inittab already have the tty set up

+	grep -q "^$tty:" $sysroot/etc/inittab && return 0

+	echo "# enable login on serial console" >> $sysroot/etc/inittab

+	echo "$tty::respawn:/sbin/getty -L $tty $speed vt100" \

+		>> $sysroot/etc/inittab

+}

+

 # gotta start from somewhere :)

 echo "Alpine Init $VERSION"

@@ -365,6 +376,11 @@

 fi

 apk add --root $sysroot $repo_opt $apkflags $pkgs >/dev/null

 eend $?

+

+# fix inittab if serial console

+case  "$KOPT_console" in

+	ttyS*) setup_inittab_serial $(echo "$KOPT_console" | tr ',' ' ')

+esac

 # copy alpine release info

 cp $ALPINE_MNT/.alpine-release $sysroot/