Ignore dockerignore lines that contain only whitespace1852-dockerignore

Signed-off-by: Joffrey F <joffrey@docker.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/docker/api/build.py b/docker/api/build.py
index 9ff2dfb..34456ab 100644
--- a/docker/api/build.py
+++ b/docker/api/build.py
@@ -145,7 +145,9 @@ class BuildApiMixin(object):
             exclude = None
             if os.path.exists(dockerignore):
                 with open(dockerignore, 'r') as f:
-                    exclude = list(filter(bool, f.read().splitlines()))
+                    exclude = list(filter(
+                        bool, [l.strip() for l in f.read().splitlines()]
+                    ))
             context = utils.tar(
                 path, exclude=exclude, dockerfile=dockerfile, gzip=gzip
             )