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

[Max Reitz <mreitz@redhat.com>]

On 2014-11-12 at 05:47, Eric Blake wrote:
> On 11/11/2014 06:34 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 | 16 +++++++++++++++-
>>   1 file changed, 15 insertions(+), 1 deletion(-)
>>
>> diff --git a/tests/qemu-iotests/common.filter b/tests/qemu-iotests/common.filter
>> index 3acdb30..e24dab4 100644
>> --- a/tests/qemu-iotests/common.filter
>> +++ b/tests/qemu-iotests/common.filter
>> @@ -165,9 +165,23 @@ _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 's#\\#\\\\#g' | \
>> +        while IFS='' read line; do
>> +            if [[ $line == '    "QMP": {' ]]; then
> Good that this is a /bin/bash script and not /bin/sh :)

Ah, right, yes, I just copied the code I had written for filtering out 
the image-specific information from the qemu-img info output.

> But - is it really worth doing this in shell?  Why not just do it in sed?

Because I don't know sed well enough. ;-)

> sed -e ... \
>      -e 's#\\#\\\\#g' \
>      -e '/    "QMP": {/,/    }/ c\' \
>      -e '    QMP_VERSION'

Will do, thanks.

Max