Re: [Qemu-devel] [PATCH v2 2/3] iotests: _filter_qmp for pretty JSON output

[Eric Blake <eblake@redhat.com>]

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On 11/14/2014 02:02 AM, Max Reitz wrote:
> _filter_qmp should be able to correctly filter out the QMP version
> object for pretty JSON output.
> 
> Signed-off-by: Max Reitz <mreitz@redhat.com>
> ---
>  tests/qemu-iotests/common.filter | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/tests/qemu-iotests/common.filter b/tests/qemu-iotests/common.filter
> index 3acdb30..63d15b3 100644
> --- a/tests/qemu-iotests/common.filter
> +++ b/tests/qemu-iotests/common.filter
> @@ -165,9 +165,12 @@ _filter_qemu()
>  # replace problematic QMP output like timestamps
>  _filter_qmp()
>  {
> +    discard=0
> +
>      _filter_win32 | \
>      sed -e 's#\("\(micro\)\?seconds": \)[0-9]\+#\1 TIMESTAMP#g' \
> -        -e 's#^{"QMP":.*}$#QMP_VERSION#'
> +        -e 's#^{"QMP":.*}$#QMP_VERSION#' \
> +        -e '/^    "QMP": {\s*$/, /^    }\s*$/ c\    QMP_VERSION'

Technically, portable sed requires a newline between the initial 'c\'
and the first line of replacement.  Use of multiple -e is the easiest
way to provide newlines (sed concatenates separate -e strings with an
implicit newline).  Even though GNU sed doesn't barf on your variant,
I'd still prefer:

-e '/^    "QMP": {/, /^    }/ c\' \
-e '    QMP_VERSION'

written as two lines, to ensure we don't upset BSD sed.


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


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