Yong Tang 69c28618c2 Sort the build labels passed from build --labels ...

This fix tries to fix the issue in 29619 where
labels passed from `build --labels` are not sorted.
As a result, if multiple labels have been passed,
each `docker build --labels A=A --labels B=B --labels C=C`
will generate different layers.

This fix fixes the issue by sort the Labels before
they are concatenated to `LABEL ...`.

A unit test has been added to cover the changes

This fix fixes 29619.

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>
Upstream-commit: d32efdbf8baba891a35c740454624206f41be94a
Component: engine

2016-12-22 07:32:52 -08:00

components/engine

Sort the build labels passed from build --labels

2016-12-22 07:32:52 -08:00

S

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