Re: [Xen-devel] [PATCH OSSTEST v1] ap-fetch-version: Arrange for osstest merges from upstream to be stable

[Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>]

Ian Campbell writes ("[PATCH OSSTEST v1] ap-fetch-version: Arrange for osstest 
merges from upstream to be stable"):
> If a downstream osstest instance has nothing to test it its local
> pretest then it will attempt to merge from the upstream instance. If
> this fails then it will try again and again generating a new merge
> commit each time, even if upstream has not moved.
> 
> It is desirable that these merges instead be stable i.e. the same if
> the inputs have not changed. This is good for potential bisection
> attempts, history reporting/mining as well as just being sensible.
> 
> Here we arrange for this by recording the last merge "epoch" (being
> the first merge of the current input branches) in a new branch
> "merge-epoch" in the local testing.git and comparing our fresh merge
> against it.
> 
> If the tree and parents are the same then the merge is effectively
> identical (it may/will differ in the date) and we reuse the epoch
> merge.
> 
> If they new merge does not match then something has changed (i.e.
> upstream has moved on) and so we take the new merge and establish a
> new epoch.
> 
> Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>

Acked-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>

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