$ git clone -n https://src.fedoraproject.org/rpms/createrepo_c.git /var/lib/mock/f39-build-1453445-32883/root/chroot_tmpdir/scmroot/createrepo_c
Cloning into '/var/lib/mock/f39-build-1453445-32883/root/chroot_tmpdir/scmroot/createrepo_c'...
$ git fetch origin 62bba9a417b82b8cccab833e04259d3da873521a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/createrepo_c
 * [new ref]         62bba9a417b82b8cccab833e04259d3da873521a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 62bba9a BuildRequires: pkgconfig(libzstd)