Misleading error log - Dockerfile parse error line 2: ARG names can not be blank

[dangspaceiq]

Error response from daemon: Dockerfile parse error line 2: ARG names can not be blank.

Dockerfile contains:

ARG ARG_AWS_ACCESS_KEY_ID = "NOTSET"

The error goes away if you remove the spaces around the equal sign.

It should wether:

1. Handle spaces
2. Log the error specifying what needs to be corrected

[rcjsuen]

@dangspaceiq It seems you are reporting an issue with docker build itself. Is that what you are suggesting? Or are you suggesting that the dockerfile-utils library should be flagging this error?