$ git clone -n https://src.fedoraproject.org/rpms/gap-pkg-cvec.git /var/lib/mock/f38-build-side-42-init-devel-595466-26162/root/chroot_tmpdir/scmroot/gap-pkg-cvec
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-595466-26162/root/chroot_tmpdir/scmroot/gap-pkg-cvec'...
$ git fetch origin a74aac8568133e8d465533ed25b4dae83ce51acc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gap-pkg-cvec
 * [new ref]         a74aac8568133e8d465533ed25b4dae83ce51acc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a74aac8 Version 2.8.1