I'm not an expert in this abomination, but it looks all the world like invoking "git show-ref --verify".
(Of course a Git ref is usually just a file in .git with a SHA1 in it. They don't care about the SHA1, so really they are launching a Git process for a file exists operation. This used to take them 400ms, but now it's only 100ms!)
https://gitlab.com/gitlab-org/gitaly/blob/master/internal/se...
I'm not an expert in this abomination, but it looks all the world like invoking "git show-ref --verify".
(Of course a Git ref is usually just a file in .git with a SHA1 in it. They don't care about the SHA1, so really they are launching a Git process for a file exists operation. This used to take them 400ms, but now it's only 100ms!)