linux-kernel - Re: [PATCH] scripts/gdb: Add automatic path expansion when loading modules

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Message-ID: <5757EEC1.6000309@gmail.com>
Date:	Wed, 8 Jun 2016 13:09:05 +0300
From:	Nikolay Borisov <n.borisov.lkml@...il.com>
To:	Jan Kiszka <jan.kiszka@...mens.com>
Cc:	linux-kernel@...r.kernel.org,
	Kieran Bingham <kieran@...uared.org.uk>
Subject: Re: [PATCH] scripts/gdb: Add automatic path expansion when loading
 modules



On 06/08/2016 12:35 PM, Jan Kiszka wrote:
> On 2016-06-07 23:26, Nikolay Borisov wrote:
>> Python doesn't do automatic expansion of paths. In case one passes
>> path of the from ~/foo/bar the gdb scripts won't automatically expand
>> that and as a result the symbols files won't be loaded. Fix this
>> by explicitly expanding all paths which begin with "~"
>>
>> Signed-off-by: Nikolay Borisov <n.borisov.lkml@...il.com>
>> ---
>>  scripts/gdb/linux/symbols.py | 7 +++++++
>>  1 file changed, 7 insertions(+)
>>
>> diff --git a/scripts/gdb/linux/symbols.py b/scripts/gdb/linux/symbols.py
>> index 9a0f8923f67c..2f5b2bee8c34 100644
>> --- a/scripts/gdb/linux/symbols.py
>> +++ b/scripts/gdb/linux/symbols.py
>> @@ -81,6 +81,12 @@ lx-symbols command."""
>>                          self.module_files.append(root + "/" + name)
>>          self.module_files_updated = True
>>  
>> +    def __expand_homedir(self):
>> +        for index, path in enumerate(self.module_paths):
>> +            if path.startswith("~"):
>> +                self.module_paths[index] = os.path.expanduser(path)
>> +
>> +
>>      def _get_module_file(self, module_name):
>>          module_pattern = ".*/{0}\.ko$".format(
>>              module_name.replace("_", r"[_\-]"))
>> @@ -160,6 +166,7 @@ lx-symbols command."""
>>          self.module_files = []
>>          self.module_files_updated = False
>>  
>> +        self.__expand_homedir()
>>          self.load_all_symbols()
>>  
>>          if hasattr(gdb, 'Breakpoint'):
>>
> 
> Valid point, but let's expand unconditionally in invoke when building
> self.module_paths.
> 
> I'm no Python expert, but my feeling tells me that there is even a more
> compact way to do loop. Does this work?
> 
> module_paths = [expanduser(p) for p in arg.spilt()]

module_paths = [os.path.expanduser(p) for p in arg.spilt()] does work.

I'm no python expert either, but list comprehensions is more idiomatic
indeed. I will cook up a patch tonight and resend, unless you want to do
it.

> 
> Jan
>