Re: [Xen-devel] [PATCH 06/46] tools/pygrub: store kernels in /var/run/xen/pygrub

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 22/09/14 13:59, Olaf Hering wrote:
> Move location of temporary bootfiles from /var/run/xend/boot to
> /var/run/xen/pygrub. Create the subdirectory if does not exist.
> The <dir> argument --output-directory must be an existing directory.
>
> 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>
> Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
> ---
>  tools/pygrub/src/pygrub | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/tools/pygrub/src/pygrub b/tools/pygrub/src/pygrub
> index 2618e11..e73a174 100644
> --- a/tools/pygrub/src/pygrub
> +++ b/tools/pygrub/src/pygrub
> @@ -778,7 +778,7 @@ if __name__ == "__main__":
>      debug = False
>      not_really = False
>      output_format = "sxp"
> -    output_directory = "/var/run/xend/boot"
> +    output_directory = "/var/run/xen/pygrub"
>  
>      # what was passed in
>      incfg = { "kernel": None, "ramdisk": None, "args": "" }
> @@ -829,11 +829,17 @@ if __name__ == "__main__":
>                  sys.exit(1)
>              output_format = a
>          elif o in ("--output-directory",):
> +            if not os.path.isdir(a):
> +                print "%s is not an existing directory" % a
> +                sys.exit(1)
>              output_directory = a
>  
>      if debug:
>       logging.basicConfig(level=logging.DEBUG)
>  
> +    if not os.path.isdir(output_directory):
> +        os.mkdir(output_directory, 0700)

This can fail if output_directory exists but is not a directory.  It
needs wrapping to catch OSError and provide a more useful error to the user.

~Andrew

> +
>      if output is None or output == "-":
>          fd = sys.stdout.fileno()
>      else:
>
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