$ git clone -n https://src.fedoraproject.org/rpms/copr-messaging.git /var/lib/mock/f45-build-4681-333/root/chroot_tmpdir/scmroot/copr-messaging
Cloning into '/var/lib/mock/f45-build-4681-333/root/chroot_tmpdir/scmroot/copr-messaging'...
$ git fetch origin 4849421789ce7b6660c167d1756f83c5808efb77:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/copr-messaging
 * [new ref]         4849421789ce7b6660c167d1756f83c5808efb77 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4849421 Update copr-messaging to 1.3-1