Patrick Williams | c124f4f | 2015-09-15 14:41:29 -0500 | [diff] [blame] | 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 | |
| 15 | DEBUG_SHELL="false" |
| 16 | |
| 17 | debug_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 | |
| 75 | debug_enabled() { |
| 76 | return 0 |
| 77 | } |
| 78 | |
| 79 | debug_run() { |
| 80 | add_module_pre_hook "debug_hook_handler" |
| 81 | add_module_post_hook "debug_hook_handler" |
| 82 | } |