On Wed, Oct 3, 2018 at 3:23 PM Ævar Arnfjörð Bjarmason [off-list ref] wrote:

Don't have time to patch this now, but thought I'd send a note / RFC
about this.

Now that we have the commit graph it's nice to be able to set
e.g. core.commitGraph=true & gc.writeCommitGraph=true in ~/.gitconfig or
/etc/gitconfig to apply them to all repos.

But when I clone e.g. linux.git stuff like 'tag --contains' will be slow
until whenever my first "gc" kicks in, which may be quite some time if
I'm just using it passively.

Since you have core.hooksPath, you can already force gc (even in
detached mode) in post-checkout hook. I'm adding a new
"post-init-repo" hook to allow more customization right after clone or
init-db which may also be useful for other things than gc.
-- 
Duy