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>

4 files changed, 86 insertions, 0 deletions

diff --git a/meta/recipes-core/busybox/files/inittab b/meta/recipes-core/busybox/files/inittab
new file mode 100644
index 0000000000..bfec4a7743
--- /dev/null
+++ b/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
diff --git a/meta/recipes-core/busybox/files/rcK b/meta/recipes-core/busybox/files/rcK
new file mode 100644
index 0000000000..050086ecd8
--- /dev/null
+++ b/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.
+            $i stop
+            ;;
+    esac
+done
+
diff --git a/meta/recipes-core/busybox/files/rcS b/meta/recipes-core/busybox/files/rcS
new file mode 100644
index 0000000000..d18c26b4c3
--- /dev/null
+++ b/meta/recipes-core/busybox/files/rcS
@@ -0,0 +1,26 @@
+#!/bin/sh
+
+# Stop all init scripts in /etc/init.d
+# executing them in reversed numerical order.
+#
+
+for i in /etc/rcS.d/S??* /etc/rc5.d/S??* ;do
+     # Ignore dangling symlinks (if any).
+     [ ! -f "$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
+
diff --git a/meta/recipes-core/busybox/files/runlevel b/meta/recipes-core/busybox/files/runlevel
new file mode 100644
index 0000000000..866f3b5945
--- /dev/null
+++ b/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"
+