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Miguel Bernabeu Diaz d4947fce23 Add --expect-no-changes flag to preview (#449)
We want to offer a return-code oriented interface to detect changes
pending to be applied. The preview command, by default, returns 0
regardless of pending changes.

We add a flag, `--expect-no-changes`, that will return non-zero if
there are changes pending application, and 0 if there are none.
2019-02-13 20:11:26 -05:00
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