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author | Otavio Salvador <otavio@ossystems.com.br> | 2011-12-07 21:23:00 +0000 |
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committer | Richard Purdie <richard.purdie@linuxfoundation.org> | 2011-12-08 15:14:05 +0000 |
commit | 7b69ad2167a1f0e57db82817b98a0cbcb70a0dd3 (patch) | |
tree | b5715e5e90ea8174dbfb0646d81bad43609eb2dd /meta/recipes-core/initrdscripts/initramfs-framework/init | |
parent | c9f714062c1100cedbcb2c16d16656e3f5442133 (diff) | |
download | openembedded-core-contrib-7b69ad2167a1f0e57db82817b98a0cbcb70a0dd3.tar.gz |
initramfs-framework: provides a modular initramfs
Provides the API and modules for a modular initramfs. The currently
included modules are:
* initramfs-module-debug adds support to dynamic debugging of
initramfs using bootparams
* initramfs-module-udev: enables udev usage
* initramfs-module-mdev: enables mdev usage
* initramfs-module-e2fs: adds support for ext4, ext3 and ext2
filesystems
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
Diffstat (limited to 'meta/recipes-core/initrdscripts/initramfs-framework/init')
-rwxr-xr-x | meta/recipes-core/initrdscripts/initramfs-framework/init | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/meta/recipes-core/initrdscripts/initramfs-framework/init b/meta/recipes-core/initrdscripts/initramfs-framework/init new file mode 100755 index 0000000000..fc4b0db4b4 --- /dev/null +++ b/meta/recipes-core/initrdscripts/initramfs-framework/init @@ -0,0 +1,136 @@ +#!/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." |