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

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Date:	Wed, 8 Jun 2016 12:21:50 +0200
From:	Jan Kiszka <jan.kiszka@...mens.com>
To:	Nikolay Borisov <n.borisov.lkml@...il.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 2016-06-08 12:09, Nikolay Borisov wrote:
> 
> 
> 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.

Go ahead, looking forward to your patch!

Thanks
Jan

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