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Re: [Libguestfs] [PATCH nbdkit] docs: Suggest how to detect if a filter is installed.



On Sat, Sep 21, 2019 at 09:41:04PM +0200, Martin Kletzander wrote:
> On Sat, Sep 21, 2019 at 03:53:45PM +0100, Richard W.M. Jones wrote:
> >Thanks: Eric Blake, Martin Kletzander.
> >---
> >docs/nbdkit-probing.pod | 11 +++++++++++
> >1 file changed, 11 insertions(+)
> >
> >diff --git a/docs/nbdkit-probing.pod b/docs/nbdkit-probing.pod
> >index 94bdfb4..46a7c47 100644
> >--- a/docs/nbdkit-probing.pod
> >+++ b/docs/nbdkit-probing.pod
> >@@ -80,6 +80,17 @@ installed.  A complete shell script which does this is:
> >     fi
> > done
> >
> >+=head2 Detect if a filter is installed
> >+
> >+To find out if a filter is installed (and working) use
> >+I<--dump-plugin> with the C<null> plugin and the name of the filter to
> >+test:
> >+
> >+ nbdkit --dump-plugin --filter=foo null
> >+
> >+This will fail with an error and non-zero exit code if the C<foo>
> >+filter cannot be loaded.
> >+
>
> Looks good, for people like me it would be also nice to mention that
> the above command will list the filter's parameters as well.

Hehe, unfortunately it lists the plugin's parameters modulated by
the filter's parameters :-(  Another reason why we really
need a proper dump-filter mode, one day.

Thanks,

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
libguestfs lets you edit virtual machines.  Supports shell scripting,
bindings from many languages.  http://libguestfs.org


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