Re: [Xen-devel] [PATCH] tools/pygrub: store kernels in /var/run/pygrub

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 17/04/14 11:52, Olaf Hering wrote:
> Move location of temporary bootfiles from /var/run/xend/boot to
> /var/run/pygrub. If the directory does not exist create it, unless
> --output-directory=<dir> was specified.
>
> The reason for this change is that all entrys below /var/run have to be
> created at runtime in case /var/run is cleared on every boot.
>
> Signed-off-by: Olaf Hering <olaf@xxxxxxxxx>
> ---
>
> New code not runtime tested as pygrub, just as hello_world.py...

I don't think it is valid in the slightest for programs like this to be
mkdir()ing their environment.  It is very much a packaging responsibility.

>
>  tools/pygrub/src/pygrub | 13 ++++++++++++-
>  1 file changed, 12 insertions(+), 1 deletion(-)
>
> diff --git a/tools/pygrub/src/pygrub b/tools/pygrub/src/pygrub
> index 54fecee..a89fd49 100644
> --- a/tools/pygrub/src/pygrub
> +++ b/tools/pygrub/src/pygrub
> @@ -14,6 +14,7 @@
>  #
>  
>  import os, sys, string, struct, tempfile, re, traceback
> +import errno
>  import copy
>  import logging
>  import platform
> @@ -757,7 +758,7 @@ if __name__ == "__main__":
>      debug = False
>      not_really = False
>      output_format = "sxp"
> -    output_directory = "/var/run/xend/boot"
> +    output_directory = None
>  
>      # what was passed in
>      incfg = { "kernel": None, "ramdisk": None, "args": "" }
> @@ -813,6 +814,16 @@ if __name__ == "__main__":
>      if debug:
>       logging.basicConfig(level=logging.DEBUG)
>  
> +    if output_directory is None:
> +        output_directory = "/var/run/pygrub"
> +        try:
> +            os.mkdir(output_directory, 0700)
> +        except OSError as exc:

This is only valid for python 2.5 (or possibly 2.6).  You want

except OSError,exc:

for 2.4 compatibility.

~Andrew

> +            if exc.errno == errno.EEXIST and os.path.isdir(output_directory):
> +                pass
> +            else:
> +                raise
> +
>      if output is None or output == "-":
>          fd = sys.stdout.fileno()
>      else:
>
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