--- /dev/null
+#!/bin/sh
+# Copyright (C) 2011 O.S. Systems Software LTDA.
+# Licensed on MIT
+
+# Adds support to dynamic debugging of initramfs using bootparam in
+# following format:
+# shell : starts a shell before and after each module
+# shell=before:<module> : starts a shell before <module> is loaded and run
+# shell=after:<module> : starts a shell after <module> is loaded and run
+#
+# shell-debug : run set -x as soon as possible
+# shell-debug=before:<module> : run set -x before <module> is loaded and run
+# shell-debug=after:<module> : run set -x after <module> is loaded and run
+
+DEBUG_SHELL="false"
+
+debug_hook_handler() {
+ status=$1
+ module=$2
+
+ if [ -n "$bootparam_shell" ] && [ "$bootparam_shell" != "true" ]; then
+ shell_wanted_status=`expr $bootparam_shell : '\(.*\):.*'`
+ shell_wanted_module=`expr $bootparam_shell : '.*:\(.*\)'`
+
+ if [ "$shell_wanted_status" = "before" ]; then
+ shell_wanted_status=pre
+ else
+ shell_wanted_status=post
+ fi
+ fi
+
+ if [ "$bootparam_shell" = "true" ] ||
+ ( [ "$status" = "$shell_wanted_status" ] &&
+ [ "$module" = "$shell_wanted_module" ] ); then
+ if [ "$status" = "pre" ]; then
+ status_msg="before"
+ else
+ status_msg="after"
+ fi
+
+ msg "Starting shell $status_msg $module..."
+ sh
+ fi
+
+ if [ -n "$bootparam_shell_debug" ] && [ "$bootparam_shell_debug" != "true" ]; then
+ shell_debug_wanted_status=`expr $bootparam_shell_debug : '\(.*\):.*'`
+ shell_debug_wanted_module=`expr $bootparam_shell_debug : '.*:\(.*\)'`
+
+ if [ "$shell_debug_wanted_status" = "before" ]; then
+ shell_debug_wanted_status=pre
+ else
+ shell_debug_wanted_status=post
+ fi
+ fi
+
+ if [ "$bootparam_shell_debug" = "true" ] ||
+ ( [ "$status" = "$shell_debug_wanted_status" ] &&
+ [ "$module" = "$shell_debug_wanted_module" ] ); then
+ if [ "$DEBUG_SHELL" = "true" ]; then
+ return 0
+ fi
+
+ if [ "$status" = "pre" ]; then
+ status_msg="before"
+ else
+ status_msg="after"
+ fi
+
+ msg "Starting shell debugging $status_msg $module..."
+ DEBUG_SHELL="true"
+ set -x
+ fi
+}
+
+debug_enabled() {
+ return 0
+}
+
+debug_run() {
+ add_module_pre_hook "debug_hook_handler"
+ add_module_post_hook "debug_hook_handler"
+}
--- /dev/null
+#!/bin/sh
+# Copyright (C) 2011 O.S. Systems Software LTDA.
+# Licensed on MIT
+
+e2fs_enabled() {
+ return 0
+}
+
+e2fs_run() {
+ filesystems="ext4 ext3 ext2"
+
+ # load modules
+ for fs in $filesystems; do
+ load_kernel_module $fs
+ done
+
+ for fs in $filesystems; do
+ eval "fs_options=\$bootparam_${fs}"
+ if [ -n "$fs_options" ]; then
+ dev=`expr "$fs_options" : '\([^:]*\).*'`
+ path=`expr "$fs_options" : '[^:]*:\([^:]*\).*'`
+
+ info "Mounting $dev as $fs on $path as $fs..."
+ mkdir -p $path
+ mount -t $fs $dev $path
+ fi
+ done
+}
--- /dev/null
+#!/bin/sh
+# Copyright (C) 2011 O.S. Systems Software LTDA.
+# Licensed on MIT
+
+finish_enabled() {
+ return 0
+}
+
+finish_run() {
+ if [ -n "$ROOTFS_DIR" ]; then
+ if [ -n "$bootparam_rootdelay" ]; then
+ debug "Sleeping for $rootdelay second(s) to wait root to settle..."
+ sleep $bootparam_rootdelay
+ fi
+
+ if [ -n "$bootparam_root" ]; then
+ debug "No e2fs compatible filesystem has been mounted, mounting $bootparam_root..."
+
+ if [ "${bootparam_root:0:5}" = "UUID=" ]; then
+ bootparam_root="/dev/disk/by-uuid/${bootparam_root/UUID=/}"
+ fi
+
+ if [ -e "$bootparam_root" ]; then
+ mount $bootparam_root $ROOTFS_DIR
+ else
+ debug "root '$bootparam_root' doesn't exist."
+ fi
+ fi
+
+ if [ ! -d $ROOTFS_DIR/dev ]; then
+ fatal "ERROR: There's no '/dev' on rootfs."
+ fi
+
+ info "Switching root to '$ROOTFS_DIR'..."
+
+ debug "Moving /dev, /proc and /sys onto rootfs..."
+ mount --move /dev $ROOTFS_DIR/dev
+ mount --move /proc $ROOTFS_DIR/proc
+ mount --move /sys $ROOTFS_DIR/sys
+
+ cd $ROOTFS_DIR
+ exec switch_root -c /dev/console $ROOTFS_DIR /sbin/init
+ else
+ debug "No rootfs has been set"
+ fi
+}
--- /dev/null
+#!/bin/sh
+# Copyright (C) 2011 O.S. Systems Software LTDA.
+# Licensed on MIT
+#
+# Provides the API to be used by the initramfs modules
+#
+# Modules need to provide the following functions:
+#
+# <module>_enabled : check if the module ought to run (return 1 to skip)
+# <module>_run : do what is need
+#
+# Boot parameters are available on environment in the as:
+#
+# 'foo=value' as 'bootparam_foo=value'
+# 'foo' as 'bootparam_foo=true'
+
+# Register a function to be called before running a module
+# The hook is called as:
+# <function> pre <module>
+add_module_pre_hook() {
+ MODULE_PRE_HOOKS="$MODULE_PRE_HOOKS $1"
+}
+
+# Register a function to be called after running a module
+# The hook is called as:
+# <function> post <module>
+add_module_post_hook() {
+ MODULE_POST_HOOKS="$MODULE_POST_HOOKS $1"
+}
+
+# Load kernel module
+load_kernel_module() {
+ if modprobe $1 >/dev/null 2>&1; then
+ info "Loaded module $1"
+ else
+ debug "Failed to load module $1"
+ fi
+}
+
+# Prints information
+msg() {
+ echo "$@" >/dev/console
+}
+
+# Prints information if verbose bootparam is used
+info() {
+ [ -n "$bootparam_verbose" ] && echo "$@" >/dev/console
+}
+
+# Prints information if debug bootparam is used
+debug() {
+ [ -n "$bootparam_debug" ] && echo "DEBUG: $@" >/dev/console
+}
+
+# Prints a message and start a endless loop
+fatal() {
+ echo $1 >/dev/console
+ echo >/dev/console
+
+ while [ "true" ]; do
+ sleep 3600
+ done
+}
+
+# Variables shared amoung modules
+ROOTFS_DIR="/rootfs" # where to do the switch root
+MODULE_PRE_HOOKS="" # functions to call before running each module
+MODULE_POST_HOOKS="" # functions to call after running each module
+MODULES_DIR=/init.d # place to look for modules
+
+# initialize /proc and /sys
+mkdir -p /proc /sys
+mount -t proc proc /proc
+mount -t sysfs sysfs /sys
+
+# populate bootparam environment
+for p in `cat /proc/cmdline`; do
+ opt="${p%%=*}"
+ opt=${opt/-/_}
+ if [ "${p/=/}" = "$p" ]; then
+ eval "bootparam_${opt}=true"
+ else
+ eval "bootparam_${opt}=\"${p#*=}\""
+ fi
+done
+
+# use /dev with devtmpfs
+if grep -q devtmpfs /proc/filesystems; then
+ mkdir -p /dev
+ mount -t devtmpfs devtmpfs /dev
+else
+ if [ ! -d /dev ]; then
+ fatal "ERROR: /dev doesn't exist and kernel doesn't has devtmpfs enabled."
+ fi
+fi
+
+mkdir $ROOTFS_DIR
+
+# Load and run modules
+for m in $MODULES_DIR/*; do
+ # Skip backup files
+ if [ "${m/\~/}" != "$m" ]; then
+ continue
+ fi
+
+ module=`basename $m | cut -d'-' -f 2`
+ debug "Loading module $module"
+
+ # pre hooks
+ for h in $MODULE_PRE_HOOKS; do
+ debug "Calling module hook (pre): $h"
+ eval "$h pre $module"
+ debug "Finished module hook (pre): $h"
+ done
+
+ # process module
+ source $m
+
+ if ! eval "${module}_enabled"; then
+ debug "Skipping module $module"
+ continue
+ fi
+
+ debug "Running ${module}_run"
+ eval "${module}_run"
+
+ # post hooks
+ for h in $MODULE_POST_HOOKS; do
+ debug "Calling module hook (post): $h"
+ eval "$h post $module"
+ debug "Finished module hook (post): $h"
+ done
+done
+
+# Catch all
+fatal "ERROR: Initramfs failed to initialize the system."
--- /dev/null
+#!/bin/sh
+# Copyright (C) 2011 O.S. Systems Software LTDA.
+# Licensed on MIT
+
+mdev_enabled() {
+ if [ ! -e /sbin/mdev ]; then
+ debug "/sbin/mdev doesn't exist"
+ return 1
+ fi
+
+ return 0
+}
+
+mdev_run() {
+ # setup the environment
+ mount -t tmpfs tmpfs /dev
+
+ mkdir -m 1777 /dev/shm
+
+ mkdir -m 0755 /dev/pts
+ mount -t devpts devpts /dev/pts
+
+ echo /sbin/mdev > /proc/sys/kernel/hotplug
+ mdev -s
+
+ # load modules for devices
+ find /sys -name modalias | while read m; do
+ load_kernel_module $(cat $m)
+ done
+}
--- /dev/null
+#!/bin/sh
+# Copyright (C) 2011 O.S. Systems Software LTDA.
+# Licensed on MIT
+
+udev_enabled() {
+ if [ ! -e /sbin/udevd ]; then
+ debug "/sbin/udev doesn't exist"
+ return 1
+ fi
+
+ return 0
+}
+
+udev_run() {
+ mkdir -p /run
+
+ udevd --daemon > /dev/null
+ udevadm trigger --action=add
+ udevadm settle
+
+ killall udevd 2>/dev/null
+}
--- /dev/null
+DESCRIPTION = "initramfs modular system"
+LICENSE = "MIT"
+LIC_FILES_CHKSUM = "file://${COREBASE}/meta/COPYING.MIT;md5=3da9cfbcb788c80a0384361b4de20420"
+RDEPENDS = "busybox"
+
+inherit allarch
+
+SRC_URI = "file://init \
+ file://finish \
+ file://mdev \
+ file://udev \
+ file://e2fs \
+ file://debug"
+
+do_install() {
+ install -d ${D}/init.d
+
+ # base
+ install -m 0755 ${WORKDIR}/init ${D}/init
+ install -m 0755 ${WORKDIR}/finish ${D}/init.d/99-finish
+
+ # mdev
+ install -m 0755 ${WORKDIR}/mdev ${D}/init.d/01-mdev
+
+ # udev
+ install -m 0755 ${WORKDIR}/udev ${D}/init.d/01-udev
+
+ # e2fs
+ install -m 0755 ${WORKDIR}/e2fs ${D}/init.d/10-e2fs
+
+ # debug
+ install -m 0755 ${WORKDIR}/debug ${D}/init.d/00-debug
+}
+
+PACKAGES = "${PN}-base \
+ initramfs-module-mdev \
+ initramfs-module-udev \
+ initramfs-module-e2fs \
+ initramfs-module-debug"
+
+FILES_${PN}-base = "/init /init.d/99-finish"
+
+DESCRIPTION_initramfs-module-mdev = "initramfs support for mdev"
+RDEPENDS_initramfs-module-mdev = "${PN}-base"
+FILES_initramfs-module-mdev = "/init.d/01-mdev"
+
+DESCRIPTION_initramfs-module-udev = "initramfs support for udev"
+RDEPENDS_initramfs-module-udev = "${PN}-base udev udev-utils"
+FILES_initramfs-module-udev = "/init.d/01-udev"
+
+DESCRIPTION_initramfs-module-e2fs = "initramfs support for ext4/ext3/ext2 filesystems"
+RDEPENDS_initramfs-module-e2fs = "${PN}-base"
+FILES_initramfs-module-e2fs = "/init.d/10-e2fs"
+
+DESCRIPTION_initramfs-module-debug = "initramfs dynamic debug support"
+RDEPENDS_initramfs-module-debug = "${PN}-base"
+FILES_initramfs-module-debug = "/init.d/00-debug"
