Andrey Devyatkin e3e8a619cc Fix #3281: Unexpected result when using build args with default values
Fix the issue when build arg is set to None instead of empty string.
Usecase:

cat docker-compose.yml
....
args:
- http_proxy
- https_proxy
- no_proxy

If http_proxy, https_proxy, no_proxy environment variables are not defined
then http_proxy, https_proxy, no_proxy build args will be set to string None which breaks all downloads

With this change build args will not passed to docker engine if they are equal to string None

Signed-off-by: Andrey Devyatkin <andrey.a.devyatkin@gmail.com>
2016-05-27 07:48:13 +02:00
..