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YaST Debugging
1.
Debugging YaST Scripts Tips
for debugging YaST modules Ladislav Slezák Ing.
2.
© Novell Inc.
All rights reserved2 Debugger in YaST There is no debugger in YaST There was a simple debugger in the past... So how to debug a YaST script?
3.
© Novell Inc.
All rights reserved3 Debugging YaST Use y2log (/var/log/YaST2/y2log) • Put y2milestone() wherever it may be useful • Use y2debug() – not logged by default, for details potentially needed • Use y2internal() for testing, remove or change it to y2debug later Use 'showy2log' colorizer • Command: y2tool showy2log -v -- tail -f • Displays y2log in colors depending on the log level (errors in red...) • Formats YCP structures (lists, maps) – more readable output • Open a separate terminal window with it
4.
© Novell Inc.
All rights reserved4 More verbose logging Enabling debug messages Set variable Y2DEBUG=1 (ZYPP_FULLLOG=1) Press Shift+F7 in the Qt UI (dynamic switching on/off decreases useless output) Another shortcut Shift+Ctrl+Alt+X in Qt UI opens an xterm window with shell. (That's useful when debugging the installer running from the installation medium, in a running system it does not make much sense, a terminal can be opened manually very easily.)
5.
© Novell Inc.
All rights reserved5 Debugging in YCP Logging an YCP Backtrace Use -1 as the first parameter in y2loglevel() call y2internal(-1, “Backtrace:”); 2007-10-10 15:21:54 <5> cyclops(14553) [YCP] sound/read_routines.ycp:51 Backtrace: 2007-10-10 15:21:54 <5> cyclops(14553) [YCP] sound/read_routines.ycp:157 extractUniqueKey (comment) 2007-10-10 15:21:54 <5> cyclops(14553) [YCP] sound/read_routines.ycp:224 read_modprobe (.modprobe_sound) 2007-10-10 15:21:54 <5> cyclops(14553) [YCP] Sound.ycp:516 read_save_info () 2007-10-10 15:21:54 <5> cyclops(14553) [YCP] Sound.ycp:710 Sound::ReadModulesConf () 2007-10-10 15:21:54 <5> cyclops(14553) [YCP] sound/wizards.ycp:262 Sound::Read (true) 2007-10-10 15:21:54 <5> cyclops(14553) [YCP] clients/sound.ycp:588 CommandLine::Run (cmdline) Breakpoints Use e.g. Popup::Message() calls Do not forget to remove them! (svn diff)
6.
© Novell Inc.
All rights reserved6 Modifying Installation System Use /y2update for overriding the current files YCP interpreter looks the files up in /y2update, $Y2DIR, $HOME/.yast2 and in $PREFIX (/usr) Create e.g. /y2update/clients, copy the file from /usr there, don't forget to compile YCP modules (ycpc -c) Works also for non YCP parts (agents, package-bindings...), very convenient for debugging YCP clients (clients are reloaded when executed) Use start_shell=1 boot option to modify the system before start
7.
© Novell Inc.
All rights reserved7 Modifying Installation System Use mount for overlaying the files Mount with -o option can be used for overriding the original files: mount -o bind /tmp/foo.ycp /usr/share/YaST2/clients/foo.ycp Modifying the installation system (inst-sys) Use Driver Update See dud Linuxrc option, basically any RPM can be added to the installation system Create an addon-product Similar to y2update Also for adding packages to the inst-sys
8.
© Novell Inc.
All rights reserved8 Debugging YaST Agents For interactive debugging run /usr/lib/YaST2/bin/y2base stdio scr Use `Read(.path), `Write(.path,...), `Execute(.path,...), `Dir(.path) commands instead of e.g. SCR::Read() in YCP script Note: rlwrap (readline wrapper) provides easy editing with history for any command line tool, use it this way: rlwrap /usr/lib/YaST2/bin/y2base stdio scr
9.
© Novell Inc.
All rights reserved9 Debugging a crash Crash – usually SIGSEGV (11), SIGABORT (6), see y2log Backtrace – probably the most valuable information, tells the exact location of the crash and program stack When YaST crashes it saves the backtrace to /var/log/YaST2/signal file. Use c++filt tool for converting the internal C++ symbols to a readable form: cat /var/log/YaST2/signal | c++filt (Note: The backtrace is created by a standard glibc function, it is not YaST specific.)
10.
© Novell Inc.
All rights reserved10 Debugging a crash GNU gdb can be also used debugging YaST *-debuginfo packages are required for full debug output How to get a backtrace? Start YaST in gdb debugger gdb /usr/lib/YaST2/bin/y2base run <module> qt Attach gdb to running YaST gdb /usr/lib/YaST2/bin/y2base <PID> Reproduce the crash Use 'bt' command in gdb See http://en.opensuse.org/Bugs/YaST for more details
11.
© Novell Inc.
All rights reserved11 UI Debugging Debugging functions UI::DumpWidgetTree() - dumps UI tree to y2log UI::FakeUserInput() - simulates user input (clicking buttons)
12.
© Novell Inc.
All rights reserved12 Questions? Do you have another tip for debugging?