RFC: set timestamps on files created by bzr

[Aaron Bentley]

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Robert Collins wrote:
> If bzr were to set a timestamp on any files it alters that is the same
> for all files altered during the same operation, then timestamp-based
> build systems that have these issues would not trigger rebuilds
> incorrectly allowing wide scale deployment.

I'm generally favourable to this, but I'd want to measure its effect on
performance.

> This could be done by calling futime (which is not exposed in python
> AFAICT, we'd need an extension to make it available) during writing the
> files in tree transform.

futime is not available, but utime is.

Aaron
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