ENV invalid when environment variable contains excaped $

[tseglevskiy]

I can not find the way to escape the variable value:

ENV SOME_PASSWORD=ASDFLKJSDLKFJK?^\$9

The $ sign is not variable - it is escaped. For me and docker it's ok, I get correct value inside docker, but dockerlint complains:

docker run -it --rm -v "$PWD/Dockerfile":/Dockerfile:ro redcoolbeans/dockerlint
ERROR: ENV contains undefined ARG or ENV variable on line 13
ERROR: Lines cannot have trailing spaces

ERROR: /Dockerfile failed.

Is it bug or feature? How to hold such values in the Dockerfile?

I use latest version:
redcoolbeans/dockerlint latest bf4955dfb649 11 days ago 41.5MB

[rnagy]

I cannot reproduce this issue.