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Re: [Qemu-trivial] [Qemu-devel] [PATCH] qmp: allow setting properties to


From: Eric Blake
Subject: Re: [Qemu-trivial] [Qemu-devel] [PATCH] qmp: allow setting properties to empty string in qmp-shell
Date: Thu, 2 Mar 2017 10:03:45 -0600
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.7.0

On 03/02/2017 06:24 AM, Daniel P. Berrange wrote:
> The qmp-shell property parser currently rejects attempts to
> set string properties to the empty string eg
> 
>   (QEMU) migrate-set-parameters  tls-hostname=
>   Error while parsing command line: Expected a key=value pair, got 
> 'tls-hostname='
> command format: <command-name>  [arg-name1=arg1] ... [arg-nameN=argN]
> 
> This is caused by checking the wrong condition after splitting
> the parameter on '='. The "partition" method will return "" for
> the separator field, if the seperator was not present, so that
> is the correct thing to check for malformed syntax.
> 
> Signed-off-by: Daniel P. Berrange <address@hidden>
> ---
>  scripts/qmp/qmp-shell | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

Reviewed-by: Eric Blake <address@hidden>

Probably worth having in 2.9, since we are having the parallel
discussion about permitting an empty string as a way to clear out TLS in
migration parameters.

> 
> diff --git a/scripts/qmp/qmp-shell b/scripts/qmp/qmp-shell
> index 0373b24..eccb88a 100755
> --- a/scripts/qmp/qmp-shell
> +++ b/scripts/qmp/qmp-shell
> @@ -166,8 +166,8 @@ class QMPShell(qmp.QEMUMonitorProtocol):
>  
>      def __cli_expr(self, tokens, parent):
>          for arg in tokens:
> -            (key, _, val) = arg.partition('=')
> -            if not val:
> +            (key, sep, val) = arg.partition('=')
> +            if sep != '=':
>                  raise QMPShellError("Expected a key=value pair, got '%s'" % 
> arg)
>  
>              value = self.__parse_value(val)
> 

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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