Yong Tang 78a82a7623 Warn/deprecate continuing on empty lines in Dockerfile ...

This fix is related to 29005 and 24693. Currently in `Dockerfile`
empty lines will continue as long as there is line escape before.
This may cause some issues. The issue in 24693 is an example.
A non-empty line after an empty line might be considered to be a
separate instruction by many users. However, it is actually part
of the last instruction under the current `Dockerfile` parsing
rule.

This fix is an effort to reduce the confusion around the parsing
of `Dockerfile`. Even though this fix does not change the behavior
of the `Dockerfile` parsing, it tries to deprecate the empty line
continuation and present a warning for the user. In this case,
at least it prompt users to check for the Dockerfile and avoid
the confusion if possible.

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>
Upstream-commit: 7815c8f8754d5473eda7cd80277a4ea3c59e3c29
Component: engine

2017-06-23 13:04:40 -04:00

components/engine

Warn/deprecate continuing on empty lines in Dockerfile

2017-06-23 13:04:40 -04:00

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