busybox: Add support for busybox-init

in config metadata we can configure busybox based init and device
initializer ( mdev ) using e.g.

VIRTUAL-RUNTIME_dev_manager = "busybox-mdev"
VIRTUAL-RUNTIME_login_manager = "busybox"
VIRTUAL-RUNTIME_init_manager = "busybox"
VIRTUAL-RUNTIME_initscripts = "initscripts"
VIRTUAL-RUNTIME_keymaps = "keymaps"
DISTRO_FEATURES_BACKFILL_CONSIDERED += "sysvinit"

busybox can be used to provide init system
combined with mdev it makes it a complete init
system for really tiny systems.

This patch uses above defines to configure features in busybox to enable
the init system and mdev in a configurable manner

(From OE-Core rev: 75cb4fe38fade382450c5f6f35d5dcf55962143e)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-core/busybox/busybox.inc

@@ -275,6 +275,21 @@ do_install () {
                        install -m 0755 ${WORKDIR}/mdev-mount.sh ${D}${sysconfdir}/mdev
                fi
 	fi
+        if grep "CONFIG_INIT=y" ${B}/.config; then
+                install -D -m 0777 ${WORKDIR}/rcS ${D}${sysconfdir}/init.d/rcS
+                install -D -m 0777 ${WORKDIR}/rcK ${D}${sysconfdir}/init.d/rcK
+                install -D -m 0755 ${WORKDIR}/runlevel ${D}${base_sbindir}/runlevel
+                if grep "CONFIG_FEATURE_USE_INITTAB=y" ${B}/.config; then
+                        install -D -m 0777 ${WORKDIR}/inittab ${D}${sysconfdir}/inittab
+                        tmp="${SERIAL_CONSOLES}"
+                        for i in $tmp
+                        do
+                                j=`echo ${i} | sed s/\;/\ /g`
+                                label=`echo ${i} | sed -e 's/tty//' -e 's/^.*;//' -e 's/;.*//'`
+                                echo "tty$label::respawn:${base_sbindir}/getty ${j}" >> ${D}${sysconfdir}/inittab
+                        done
+                fi
+        fi
 
     if ${@bb.utils.contains('DISTRO_FEATURES','systemd','true','false',d)}; then
         if grep -q "CONFIG_SYSLOGD=y" ${B}/.config; then

meta/recipes-core/busybox/busybox/init.cfg

@@ -0,0 +1,3 @@
+CONFIG_INIT=y
+CONFIG_FEATURE_USE_INITTAB=y
+

meta/recipes-core/busybox/busybox/mdev.cfg

@@ -0,0 +1,11 @@
+CONFIG_MDEV=y
+CONFIG_FEATURE_MDEV_CONF=y
+CONFIG_FEATURE_MDEV_RENAME=y
+CONFIG_FEATURE_MDEV_RENAME_REGEXP=y
+CONFIG_FEATURE_MDEV_EXEC=y
+CONFIG_FEATURE_MDEV_LOAD_FIRMWARE=y
+
+CONFIG_SETSID=y
+CONFIG_CTTYHACK=y
+
+CONFIG_FEATURE_SHADOWPASSWDS=y

meta/recipes-core/busybox/busybox_1.24.1.bb

@@ -39,6 +39,12 @@ SRC_URI = "http://www.busybox.net/downloads/busybox-${PV}.tar.bz2;name=tarball \
            file://sha256sum.cfg \
            file://getopts.cfg \
            file://resize.cfg \
+           ${@["", "file://init.cfg"][(d.getVar('VIRTUAL-RUNTIME_init_manager', True) == 'busybox')]} \
+           ${@["", "file://mdev.cfg"][(d.getVar('VIRTUAL-RUNTIME_dev_manager', True) == 'busybox-mdev')]} \
+           file://inittab \
+           file://rcS \
+           file://rcK \
+           file://runlevel \
 "
 SRC_URI_append_libc-musl = " file://musl.cfg "
 

meta/recipes-core/busybox/files/inittab

@@ -0,0 +1,24 @@
+# This is run first except when booting in single-user mode.
+
+# Startup the system
+null::sysinit:/bin/mount -t proc proc /proc
+null::sysinit:/bin/mount -t sysfs sysfs /sys
+null::sysinit:/bin/mount -t devtmpfs devtmpfs /dev
+null::sysinit:/bin/mount -o remount,rw /
+null::sysinit:/bin/mkdir -p /dev/pts
+null::sysinit:/bin/mount -t devpts devpts /dev/pts
+null::sysinit:/bin/mount -a
+
+::sysinit:/etc/init.d/rcS
+
+# Stuff to do before rebooting
+::ctrlaltdel:/sbin/reboot
+::shutdown:/etc/init.d/rcK
+::shutdown:/sbin/swapoff -a
+::shutdown:/bin/umount -a -r
+
+# Stuff to do when restarting the init process
+::restart:/sbin/init
+
+# set hostname
+null::sysinit:/bin/busybox hostname -F /etc/hostname

meta/recipes-core/busybox/files/rcK

@@ -0,0 +1,25 @@
+#!/bin/sh
+
+# Stop all init scripts in /etc/init.d
+# executing them in reversed numerical order.
+#
+for i in /etc/rc6.d/K??*; do
+     # Ignore dangling symlinks (if any).
+     [ ! -f "$i" ] && continue
+
+     case "$i" in
+	*.sh)
+	    # Source shell script for speed.
+	    (
+		trap - INT QUIT TSTP
+		set stop
+		. $i
+	    )
+	    ;;
+	*)
+	    # No sh extension, so fork subprocess.
+	    $i stop
+	    ;;
+    esac
+done
+

meta/recipes-core/busybox/files/rcS

@@ -0,0 +1,26 @@
+#!/bin/sh
+
+# Stop all init scripts in /etc/init.d
+# executing them in reversed numerical order.
+#
+
+for i in /etc/rcS.d/S??* /etc/rc5.d/S??* ;do
+     # Ignore dangling symlinks (if any).
+     [ ! -f "$i" ] && continue
+
+     case "$i" in
+	*.sh)
+	    # Source shell script for speed.
+	    (
+		trap - INT QUIT TSTP
+		set stop
+		. $i
+	    )
+	    ;;
+	*)
+	    # No sh extension, so fork subprocess.
+	    $i start
+	    ;;
+    esac
+done
+

meta/recipes-core/busybox/files/runlevel

@@ -0,0 +1,11 @@
+#!/bin/sh
+# busybox init does not have LSB ( sysvinit ) like initlevels
+# so lets fake it to 5 which is what we default anyway
+# this helps with opkg post installs where it tries to invoke
+# update-rc.d ad post install step.
+# for package upgrades
+# See code in update-rc.d around line 190 where it calls runlevel
+# program
+#
+echo "5"
+