Re: [Xen-devel] [PATCH OSSTEST v3] ap-fetch-*: Support $AP_FETCH_PLACEHOLDERS envvar which outputs a placeholder

[Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>]

Ian Campbell writes ("[PATCH OSSTEST v3] ap-fetch-*: Support 
$AP_FETCH_PLACEHOLDERS envvar which outputs a placeholder"):
> And use this in standalone-generate-dump-flight-runvars. In general I
> don't think we are interested in the specific revision_* runvars when
> using this tool but when it matters this new behaviour can be avoided
> by setting AP_FETCH_PLACEHOLDERS=n.
> 
> This is quicker even than using memoisation on the ap-fetch
> invocations and produces output like:
> 
> libvirt  build-amd64  revision_xen  ap-fetch-version-baseline:xen-unstable
> 
> This is useful when doing comparisons of before and after changes to
> e.g. make-flight since they do not pickup noise if a something/someone
> does a push in the middle.
> 
> The memoisation bits of standalone-generate-dump-flight-runvars are
> disabled if AP_FETCH_PLACEHOLDERS=y.
> 
> Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>

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

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