env handling now consistent with Docker
Added a custom action handler for '-e' and '--env' so that the
'environment' variable passed to docker reflects how docker would have
processed the same args
MODIFY
repo2docker/__main__.py
repo2docker/__main__.py
@@ -39,6 +39,27 @@ def validate_image_name(image_name):
return image_name
+# See https://github.com/jupyter/repo2docker/issues/871 for reason
+class MimicDockerEnvHandling(argparse.Action):
+ def __call__(self, parser, namespace, values, option_string=None):
+ # There are 3 cases:
+ # key=value pass as is
+ # key= pass as is
+ # key pass using current value, or don't pass
+ if "=" not in values:
+ try:
+ value_to_append = "{}={}".format(values, os.environ[values])
+ except KeyError:
+ # no local def, so don't pass
+ return
+ else:
+ value_to_append = values
+
+ # destination variable is initially defined as an empty list, so
+ # no special casing of first time is needed.
+ getattr(namespace, self.dest).append(value_to_append)
+
+
def get_argparser():
"""Get arguments that may be used by repo2docker"""
argparser = argparse.ArgumentParser(
@@ -161,12 +182,11 @@ def get_argparser():
# Process the environment options the same way that docker does, as
# they are passed directly to docker as the environment to use. This
# requires a custom action for argparse.
- # see https://docs.docker.com/engine/reference/commandline/run/#set-environment-variables--e---env---env-file
argparser.add_argument(
"--env",
"-e",
dest="environment",
- action="append",
+ action=MimicDockerEnvHandling,
help="Environment variables to define at container run time",
default=[],
)

--env handling now consistent with Docker

Added a custom action handler for '-e' and '--env' so that the
'environment' variable passed to docker reflects how docker would have
processed the same args