Re: [Qemu-devel] [Qemu-block] [PATCH v5 4/6] iotests: Valgrind fails with nonexistent directory

[John Snow <jsnow@redhat.com>]

On 7/19/19 12:30 PM, Andrey Shinkevich wrote:
> The Valgrind uses the exported variable TMPDIR and fails if the
> directory does not exist. Let us exclude such a test case from
> being run under the Valgrind and notify the user of it.
> 
> Suggested-by: Kevin Wolf <kwolf@redhat.com>
> Signed-off-by: Andrey Shinkevich <andrey.shinkevich@virtuozzo.com>
> ---
>  tests/qemu-iotests/051 | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/tests/qemu-iotests/051 b/tests/qemu-iotests/051
> index ce942a5..f8141ca 100755
> --- a/tests/qemu-iotests/051
> +++ b/tests/qemu-iotests/051
> @@ -377,6 +377,10 @@ printf %b "qemu-io $device_id \"write -P 0x33 0 4k\"\ncommit $device_id\n" |
>  $QEMU_IO -c "read -P 0x33 0 4k" "$TEST_IMG" | _filter_qemu_io
>  
>  # Using snapshot=on with a non-existent TMPDIR
> +if [ "${VALGRIND_QEMU}" == "y" ]; then
> +    _casenotrun "Valgrind needs a valid TMPDIR for itself"
> +fi
> +VALGRIND_QEMU="" \
>  TMPDIR=/nonexistent run_qemu -drive driver=null-co,snapshot=on
>  
>  # Using snapshot=on together with read-only=on
> 

The only other way around this would be a complicated mechanism to set
the TMPDIR for valgrind's sub-processes only, with e.g.

valgrind ... env TMPDIR=/nonexistent qemu ...

... It's probably not worth trying to concoct such a thing; but I
suppose it is possible. You'd have to set up a generic layer for setting
environment variables, then in the qemu shim, you could either set them
directly (non-valgrind invocation) or set them as part of the valgrind
command-line.

Or you could just take my R-B:

Reviewed-by: John Snow <jsnow@redhat.com>