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-rw-r--r--meta/recipes-core/initrdscripts/initramfs-framework/debug82
1 files changed, 82 insertions, 0 deletions
diff --git a/meta/recipes-core/initrdscripts/initramfs-framework/debug b/meta/recipes-core/initrdscripts/initramfs-framework/debug
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1#!/bin/sh
2# Copyright (C) 2011 O.S. Systems Software LTDA.
3# Licensed on MIT
4
5# Adds support to dynamic debugging of initramfs using bootparam in
6# following format:
7# shell : starts a shell before and after each module
8# shell=before:<module> : starts a shell before <module> is loaded and run
9# shell=after:<module> : starts a shell after <module> is loaded and run
10#
11# shell-debug : run set -x as soon as possible
12# shell-debug=before:<module> : run set -x before <module> is loaded and run
13# shell-debug=after:<module> : run set -x after <module> is loaded and run
14
15DEBUG_SHELL="false"
16
17debug_hook_handler() {
18 status=$1
19 module=$2
20
21 if [ -n "$bootparam_shell" ] && [ "$bootparam_shell" != "true" ]; then
22 shell_wanted_status=`expr $bootparam_shell : '\(.*\):.*'`
23 shell_wanted_module=`expr $bootparam_shell : '.*:\(.*\)'`
24
25 if [ "$shell_wanted_status" = "before" ]; then
26 shell_wanted_status=pre
27 else
28 shell_wanted_status=post
29 fi
30 fi
31
32 if [ "$bootparam_shell" = "true" ] ||
33 ( [ "$status" = "$shell_wanted_status" ] &&
34 [ "$module" = "$shell_wanted_module" ] ); then
35 if [ "$status" = "pre" ]; then
36 status_msg="before"
37 else
38 status_msg="after"
39 fi
40
41 msg "Starting shell $status_msg $module..."
42 sh
43 fi
44
45 if [ -n "$bootparam_shell_debug" ] && [ "$bootparam_shell_debug" != "true" ]; then
46 shell_debug_wanted_status=`expr $bootparam_shell_debug : '\(.*\):.*'`
47 shell_debug_wanted_module=`expr $bootparam_shell_debug : '.*:\(.*\)'`
48
49 if [ "$shell_debug_wanted_status" = "before" ]; then
50 shell_debug_wanted_status=pre
51 else
52 shell_debug_wanted_status=post
53 fi
54 fi
55
56 if [ "$bootparam_shell_debug" = "true" ] ||
57 ( [ "$status" = "$shell_debug_wanted_status" ] &&
58 [ "$module" = "$shell_debug_wanted_module" ] ); then
59 if [ "$DEBUG_SHELL" = "true" ]; then
60 return 0
61 fi
62
63 if [ "$status" = "pre" ]; then
64 status_msg="before"
65 else
66 status_msg="after"
67 fi
68
69 msg "Starting shell debugging $status_msg $module..."
70 DEBUG_SHELL="true"
71 set -x
72 fi
73}
74
75debug_enabled() {
76 return 0
77}
78
79debug_run() {
80 add_module_pre_hook "debug_hook_handler"
81 add_module_post_hook "debug_hook_handler"
82}