Re: [Qemu-devel] [PATCH v2 6/6] qemu-img: copy *key-secret opts when opening newly created files

[Daniel P. Berrange]

On Fri, Feb 03, 2017 at 11:39:35PM +0100, Max Reitz wrote:
> On 03.02.2017 13:02, Daniel P. Berrange wrote:
> > The qemu-img dd/convert commands will create a image file and
> > then try to open it. Historically it has been possible to open
> > new files without passing any options. With encrypted files
> > though, the *key-secret options are mandatory, so we need to
> > provide those options when opening the newly created file.
> > 
> > Signed-off-by: Daniel P. Berrange <address@hidden>
> > ---
> >  qemu-img.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++----
> >  1 file changed, 47 insertions(+), 4 deletions(-)
> > 
> > diff --git a/qemu-img.c b/qemu-img.c
> > index dc4c6eb..98522dd 100644
> > --- a/qemu-img.c
> > +++ b/qemu-img.c
> > @@ -319,6 +319,49 @@ static BlockBackend *img_open_file(const char 
> > *filename,
> >  }
> >  
> >  
> > +static int img_add_key_secrets(void *opaque,
> > +                               const char *name, const char *value,
> > +                               Error **errp)
> > +{
> > +    QDict **options = opaque;
> > +
> > +    if (g_str_has_suffix(name, "key-secret")) {
> > +        if (!*options) {
> > +            *options = qdict_new();
> > +        }
> > +        qdict_put(*options, name, qstring_from_str(value));
> > +    }
> > +
> > +    return 0;
> > +}
> > +
> > +static BlockBackend *img_open_new_file(const char *filename,
> > +                                       QemuOpts *create_opts,
> > +                                       const char *fmt, int flags,
> > +                                       bool writethrough, bool quiet)
> > +{
> > +    BlockBackend *blk;
> > +    Error *local_err = NULL;
> > +    QDict *options = NULL;
> > +
> > +    if (fmt) {
> > +        options = qdict_new();
> > +        qdict_put(options, "driver", qstring_from_str(fmt));
> > +    }
> > +
> > +    qemu_opt_foreach(create_opts, img_add_key_secrets, &options, NULL);
> 
> It would probably be easier to just unconditionally create an options
> QDict. It doesn't hurt if it's empty.

Ok, I will make that change.

> Anyway:
> 
> Reviewed-by: Max Reitz <address@hidden>
> 
> > +
> > +    blk = blk_new_open(filename, NULL, options, flags, &local_err);
> > +    if (!blk) {
> > +        error_reportf_err(local_err, "Could not open '%s': ", filename);
> > +        return NULL;
> > +    }
> > +    blk_set_enable_write_cache(blk, !writethrough);
> > +
> > +    return blk;

it seems I'm also leaking "options" so will adda  QDECREF too

> > +}
> > +
> > +



Regards,
Daniel
-- 
|: http://berrange.com      -o-    http://www.flickr.com/photos/dberrange/ :|
|: http://libvirt.org              -o-             http://virt-manager.org :|
|: http://entangle-photo.org       -o-    http://search.cpan.org/~danberr/ :|