When new pids are more than 9 digits long

The nwfilter tests use tck-test${pid} as the auto-generated name for
their test domains (and therefore the tap devices created for those
test domains). When the pid is > 9 digits long, the total length of
the name is > 16, which is the maximum length for any network device
name (IFNAMSIZ), and this causes failure to create the tap device,
thus failure of the test:

  /home/laine/devel/libvirt-tck/scripts/nwfilter/050-apply-verify-host.t ..
  error: Failed to start domain tck-test10513851
  error: Network interface name 'tck-test10513851' is too long:
         Numerical result out of range

The solution is to just remove "test" from the name template, so pid
can be up to 12 digits long before the test fails.

Signed-off-by: Laine Stump <laine@laine.org>
---
 scripts/nwfilter/nwfilter2vmtest.sh | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/scripts/nwfilter/nwfilter2vmtest.sh b/scripts/nwfilter/nwfilter2vmtest.sh
index ae28b73..778013b 100644
--- a/scripts/nwfilter/nwfilter2vmtest.sh
+++ b/scripts/nwfilter/nwfilter2vmtest.sh
@@ -638,8 +638,8 @@ main() {
     cd "${curdir}" || { echo "cd failed" >&2; exit 1; }
   fi
 
-  vm1="tck-test$$1"
-  vm2="tck-test$$2"
+  vm1="tck-$$1"
+  vm2="tck-$$2"
 
   createTestFilters "${flags}"
   if [ $? -ne 0 ]; then
-- 
2.14.4

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On Fri, Jun 08, 2018 at 11:00:34AM -0400, Laine Stump wrote:
> When new pids are more than 9 digits long
> 
> The nwfilter tests use tck-test${pid} as the auto-generated name for
> their test domains (and therefore the tap devices created for those
> test domains). When the pid is > 9 digits long, the total length of
> the name is > 16, which is the maximum length for any network device
> name (IFNAMSIZ), and this causes failure to create the tap device,
> thus failure of the test:
> 
>   /home/laine/devel/libvirt-tck/scripts/nwfilter/050-apply-verify-host.t ..
>   error: Failed to start domain tck-test10513851
>   error: Network interface name 'tck-test10513851' is too long:
>          Numerical result out of range
> 
> The solution is to just remove "test" from the name template, so pid
> can be up to 12 digits long before the test fails.

Alternatively just delete the <target dev=.../> and let libvirt
autoassign.

> 
> Signed-off-by: Laine Stump <laine@laine.org>
> ---
>  scripts/nwfilter/nwfilter2vmtest.sh | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>



Regards,
Daniel
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