Re: [Xen-devel] [PATCH] scripts: Use stat to check lock claim

[Wei Liu <wl@xxxxxxx>]

On Tue, Mar 10, 2020 at 09:29:04AM -0400, Jason Andryuk wrote:
> Replace the perl locking check with stat(1).  Stat is able to fstat
> stdin (file descriptor 0) when passed '-' as an argument.  This is now
> used to check $_lockfd.  stat(1) support for '-' was introduced to
> coreutils in 2009.
> 
> After A releases its lock, script B will return from flock and execute
> stat.  Since the lockfile has been removed from A, stat prints an error
> to stderr and exits non-zero.  '|| :' is needed to squash the non-zero
> exit status - otherwise the script terminates since `set -e` is enabled.
> stderr needs to be redirected to /dev/null otherwise
> /var/log/xen/xen-hotplug.log will get filled with "No such file or
> directory" messages.
> 
> This change removes the only runtime dependency of the xen toolstack on
> perl.
> 
> While here, replace some tabs with spaces to match the rest of the file.
> 
> Suggested-by: Ian Jackson <ian.jackson@xxxxxxxxxx>
> Signed-off-by: Jason Andryuk <jandryuk@xxxxxxxxx>

Acked-by: Wei Liu <wl@xxxxxxx>

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