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#!/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"
}
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