Ian Campbell fe918f8a31 pkg: Run git update-index --refresh before git diff-index. ...

Otherwise files which have an updated timestamp but no actual changes are
marked as changes because `git diff-index` only uses the `lstat` result and not
the actual file contents. Running `git update-index --refresh` updates the
cache.

Signed-off-by: Ian Campbell <ian.campbell@docker.com>

2017-07-03 10:27:31 +01:00

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