Re: [Xen-devel] [PATCH] pygrub: fix non-interactive parsing of grub1 config files

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

On 10/27/2014 12:00 PM, Simon Rowe wrote:
> Changes to handle non-numeric default attributes for grub2 caused run_grub()
> to attempt to index into the images list using a string. Pull out the code
> that handles submenus into a new function and use that to ensure sel is
> numeric.
>
> Reported-by: David Scott <dave.scott@xxxxxxxxxx>
> Signed-off-by: Simon Rowe <simon.rowe@xxxxxxxxxxxxx>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>

> ---
>   tools/pygrub/src/pygrub |   23 ++++++++++++++---------
>   1 file changed, 14 insertions(+), 9 deletions(-)
>
> diff --git a/tools/pygrub/src/pygrub b/tools/pygrub/src/pygrub
> index 1ae34a2..4cc846f 100644
> --- a/tools/pygrub/src/pygrub
> +++ b/tools/pygrub/src/pygrub
> @@ -456,11 +456,9 @@ class Grub:
>           del f
>           self.cf.parse(buf)
>   
> -    def run(self):
> -        timeout = int(self.cf.timeout)
> -
> +    def image_index(self):
>           if self.cf.default.isdigit():
> -            self.selected_image = int(self.cf.default)
> +            sel = int(self.cf.default)
>           else:
>               # We don't fully support submenus. Look for the leaf value in
>               # "submenu0>submenu1>...>menuentry" and hope that it's unique.
> @@ -472,16 +470,23 @@ class Grub:
>                       break
>   
>               # Map string to index in images array
> -            self.selected_image = 0
> +            sel = 0
>               for i in range(len(self.cf.images)):
>                   if self.cf.images[i].title == title:
> -                    self.selected_image = i
> +                    sel = i
>                       break
>   
>           # If the selected (default) image doesn't exist we select the first entry
> -        if self.selected_image > len(self.cf.images):
> +        if sel > len(self.cf.images):
>               logging.warning("Default image not found")
> -            self.selected_image = 0
> +            sel = 0
> +
> +        return sel
> +
> +    def run(self):
> +        timeout = int(self.cf.timeout)
> +        self.selected_image = self.image_index()
> +
>           self.isdone = False
>           while not self.isdone:
>               self.run_main(timeout)
> @@ -626,7 +631,7 @@ def run_grub(file, entry, fs, cfg_args):
>       if interactive and not list_entries:
>           curses.wrapper(run_main)
>       else:
> -        sel = g.cf.default
> +        sel = g.image_index()
>   
>       # set the entry to boot as requested
>       if entry is not None:

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