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

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Date:	Wed, 8 Jun 2016 11:35:25 +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 2016-06-07 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()]

Jan

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