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Yong Tang 6106313b20 More descriptive error when running a container with a too long hostname (#21445)
This fix tries to fix issues encountered when running a container with a hostname
that is longer than HOST_NAME_MAX(64).

Previously, `could not synchronise with container process` was generated as the
length of the regex check was missing.

This fix covers the length check so that a hostname that is longer than
HOST_NAME_MAX(64) will be given a correct error message.

Several unit tests cases and additional integration test cases are added as well.

This fix closes #21445.

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>
(cherry picked from commit fa44b4e81e)
2016-03-25 13:43:07 -04:00
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