Jeff King <p...@peff.net> writes:
> On Wed, Oct 22, 2014 at 08:19:07PM +0000, Crabtree, Andrew wrote:
>
>> I need to get a list of refs that can reach a certain SHA in in a script.
>>
>> git branch --contains SHA
>>
>> would be great (runs in ~2 seconds), but not my preferred option for
>> scripting.
>>
>> I tried
>>
>> for br in $(git for-each-ref --format='%(refname:short)' refs/heads/)
>> do
>> git merge-base --is-ancestor $1 ${br}
>> if [ $? -eq 0 ]
>> then
>> echo "${br}"
>> fi
>> done
>>
>> Which gives me perfect output, but takes 82 seconds to run in my environment.
>
> Right. There's some setup work that happens in `git branch --contains`
> that we end up repeating.
>
>> Is there an alternative I'm missing to give me the run time
>> performance of 'git branch --contains' but with stable output suitable
>> for parsing?
>
> Sadly, no, there isn't currently. The right tool would be `git
> for-each-ref --contains`, but it doesn't exist yet. I was working
> towards it, but got stopped on factoring out a `--contains` traversal
> suitable for both `git tag` and `git branch` (they currently are
> different and make performance tradeoffs based on the expected depth of
> the merge bases, which is usually different between tags and
> branches)[1]. That's work I'd love to resume, but I haven't gotten
> around to it yet.
>
> -Peff
>
> [1] http://thread.gmane.org/gmane.comp.version-control.git/252472
Thanks for status update. I was wondering if I should start looking
into it myself.
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