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

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

[Kashyap Chamarthy]

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

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

[Fam Zheng]

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
> 

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

[Kashyap Chamarthy]

On Mon, Sep 04, 2017 at 08:55:23PM +0800, Fam Zheng wrote:
> Hi Kashyap,
> 
> On Mon, 09/04 13:16, Kashyap Chamarthy wrote:

[...]

> > +dest_vm = (iotests.VM('dest').add_drive(test_img_path)
> > +                               .add_incoming('defer'))
> 
> Superfluous parenthesis?

Yes, the paranthesis can be removed and turn it into a single line:
    
  dest_vm = iotests.VM('dest').add_drive(test_img_path).add_incoming('defer')

> > +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.

Good point.  I did notice that thread[*] about resource clean up.  And I
see it's already applied to 'block-next'.  Will rebase and change to the
'with' statement.

[*] https://lists.nongnu.org/archive/html/qemu-devel/2017-08/msg04639.html

> Otherwise looks good to me.

Thanks for the quick review!

[...]

-- 
/kashyap

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

[Daniel P. Berrange]

On Mon, Sep 04, 2017 at 01:16:16PM +0200, 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.

FYI This looks like it'll clash with the patch I sent to fix this
test case with LUKS

https://lists.gnu.org/archive/html/qemu-devel/2017-09/msg00041.html


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

[Kashyap Chamarthy]

On Mon, Sep 04, 2017 at 03:48:12PM +0100, Daniel P. Berrange wrote:
> On Mon, Sep 04, 2017 at 01:16:16PM +0200, 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.
> 
> FYI This looks like it'll clash with the patch I sent to fix this
> test case with LUKS
> 
> https://lists.gnu.org/archive/html/qemu-devel/2017-09/msg00041.html

Oh, thanks for the pointer.  Then, I think I should wait until yours is
merged, and then rework my changes on top of it.

-- 
/kashyap

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

[Eric Blake]

[-- Attachment #1: Type: text/plain, Size: 1478 bytes --]

On 09/04/2017 08:28 AM, Kashyap Chamarthy wrote:
> On Mon, Sep 04, 2017 at 08:55:23PM +0800, Fam Zheng wrote:
>> 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".

Kevin actually argued that keeping some HMP coverage is a GOOD thing:

https://lists.gnu.org/archive/html/qemu-devel/2017-09/msg00798.html

>>
>> 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.
> 
> Good point.  I did notice that thread[*] about resource clean up.  And I
> see it's already applied to 'block-next'.  Will rebase and change to the
> 'with' statement.

I'm not sure if this patch helps us any; I personally find the unit-test
style python iotests harder to debug than the ones that produce
diff-able nnn.out files (debugging an nnn.out file that has only a list
of ..... doesn't make it easy to reproduce).  If the test already runs
well in shell, what does the conversion to Python actually buy us?

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org


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

[Kashyap Chamarthy]

On Tue, Sep 05, 2017 at 02:37:21PM -0500, Eric Blake wrote:
> On 09/04/2017 08:28 AM, Kashyap Chamarthy wrote:
> > On Mon, Sep 04, 2017 at 08:55:23PM +0800, Fam Zheng wrote:
> >> 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".
> 
> Kevin actually argued that keeping some HMP coverage is a GOOD thing:
> 
> https://lists.gnu.org/archive/html/qemu-devel/2017-09/msg00798.html

Yeah, noticed it after I sent my patch.  I agree with Kevin's argument,
so I'll just simply drop my patch.

> >> 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.
> > 
> > Good point.  I did notice that thread[*] about resource clean up.  And I
> > see it's already applied to 'block-next'.  Will rebase and change to the
> > 'with' statement.
> 
> I'm not sure if this patch helps us any; I personally find the unit-test
> style python iotests harder to debug than the ones that produce
> diff-able nnn.out files (debugging an nnn.out file that has only a list
> of ..... doesn't make it easy to reproduce).  If the test already runs
> well in shell, what does the conversion to Python actually buy us? 

While turning it to QMP, thought I'd convert it to Python as the test is
_very_ similar to 194 (also in Python).

Given Kevin's argument in the above thread you pointed out, just
disregard my patch.

-- 
/kashyap