Re: [Qemu-devel] [PATCH] qemu-iotests: Make test 192 use QMP; convert it to Python

[Fam Zheng <famz@redhat.com>]

Hi Kashyap,

On Mon, 09/04 13:16, Kashyap Chamarthy wrote:
> The test 192 ("Test NBD export with '-incoming' (non-shared
> storage migration use case from libvirt")) is currently using HMP.
> Replace the HMP usage with QMP, as the upstream preference seems to be:
> "Use QMP where possible, unless you're explicitly testing something
> related to HMP".
> 
> While at it, convert the test from Bash to Python.
> 
> Signed-off-by: Kashyap Chamarthy <kchamart@redhat.com>
> ---
>  tests/qemu-iotests/192     | 78 ++++++++++++++++++----------------------------
>  tests/qemu-iotests/192.out | 14 ++++-----
>  2 files changed, 38 insertions(+), 54 deletions(-)
> 
> diff --git a/tests/qemu-iotests/192 b/tests/qemu-iotests/192
> index b50a2c0c8e2fccdddfae4ac58ca35937c5f784c6..692475f0a8c80c81396587d3289d4b32c0ee0d21 100755
> --- a/tests/qemu-iotests/192
> +++ b/tests/qemu-iotests/192
> @@ -1,7 +1,4 @@
> -#!/bin/bash
> -#
> -# Test NBD export with -incoming (non-shared storage migration use case from
> -# libvirt)
> +#!/usr/bin/env python
>  #
>  # Copyright (C) 2017 Red Hat, Inc.
>  #
> @@ -18,46 +15,33 @@
>  # You should have received a copy of the GNU General Public License
>  # along with this program.  If not, see <http://www.gnu.org/licenses/>.
>  #
> -
> -# creator
> -owner=famz@redhat.com
> -
> -seq=`basename $0`
> -echo "QA output created by $seq"
> -
> -here=`pwd`
> -status=1	# failure is the default!
> -
> -_cleanup()
> -{
> -	_cleanup_test_img
> -}
> -trap "_cleanup; exit \$status" 0 1 2 3 15
> -
> -# get standard environment, filters and checks
> -. ./common.rc
> -. ./common.filter
> -
> -_supported_fmt generic
> -_supported_proto file
> -_supported_os Linux
> -
> -if [ "$QEMU_DEFAULT_MACHINE" != "pc" ]; then
> -    _notrun "Requires a PC machine"
> -fi
> -
> -size=64M
> -_make_test_img $size
> -
> -{
> -echo "nbd_server_start unix:$TEST_DIR/nbd"
> -echo "nbd_server_add -w drive0"
> -echo "q"
> -} | $QEMU -nodefaults -display none -monitor stdio \
> -    -drive format=$IMGFMT,file=$TEST_IMG,if=ide,id=drive0 \
> -    -incoming defer 2>&1 | _filter_testdir | _filter_qemu | _filter_hmp
> -
> -# success, all done
> -echo "*** done"
> -rm -f $seq.full
> -status=0
> +# Author: Kashyap Chamarthy <kchamart@redhat.com>
> +#         [Converted to Python from the original Bash version by Fam
> +#         Zheng (<famz@redhat.com)]
> +#
> +# Purpose: Test NBD export with '-incoming' (non-shared storage
> +# migration use case from libvirt)
> +
> +import os
> +import atexit
> +import iotests
> +
> +iotests.verify_platform(['linux'])
> +
> +img_size = '1G'
> +test_img_path = os.path.join(iotests.test_dir, 'dest.img')
> +iotests.qemu_img_pipe('create', '-f', iotests.imgfmt, test_img_path, img_size)
> +
> +iotests.log('Launching VM...')
> +nbd_sock_path = os.path.join(iotests.test_dir, 'nbd.sock')
> +dest_vm = (iotests.VM('dest').add_drive(test_img_path)
> +                               .add_incoming('defer'))

Superfluous parenthesis?

> +dest_vm.launch()
> +atexit.register(dest_vm.shutdown)

As an improvement maybe you could rebase to Stefan's "iotests: clean up
resources using context managers" series and switch to "with" for the temp file
and VM.

Otherwise looks good to me.

Fam

> +
> +iotests.log('Launching NBD server on destination...')
> +iotests.log(dest_vm.qmp('nbd-server-start', addr={'type': 'unix', 'data': {'path': nbd_sock_path}}))
> +iotests.log('Exporting the block device to NBD server...')
> +iotests.log(dest_vm.qmp('nbd-server-add', device='drive0', writable=True))
> +iotests.log('Stopping the NBD server on destination...')
> +iotests.log(dest_vm.qmp('nbd-server-stop'))
> diff --git a/tests/qemu-iotests/192.out b/tests/qemu-iotests/192.out
> index 1e0be4c4d7a891f81c2536b87c5a29a21d39138c..f62b94c5641f1a1e60f17090aeb20ed0bc037afd 100644
> --- a/tests/qemu-iotests/192.out
> +++ b/tests/qemu-iotests/192.out
> @@ -1,7 +1,7 @@
> -QA output created by 192
> -Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864
> -QEMU X.Y.Z monitor - type 'help' for more information
> -(qemu) nbd_server_start unix:TEST_DIR/nbd
> -(qemu) nbd_server_add -w drive0
> -(qemu) q
> -*** done
> +Launching VM...
> +Launching NBD server on destination...
> +{u'return': {}}
> +Exporting the block device to NBD server...
> +{u'return': {}}
> +Stopping the NBD server on destination...
> +{u'return': {}}
> -- 
> 2.9.5
>