$ git clone -n https://src.fedoraproject.org/rpms/createrepo_c.git /var/lib/mock/f40-build-735288-106332/root/chroot_tmpdir/scmroot/createrepo_c
Cloning into '/var/lib/mock/f40-build-735288-106332/root/chroot_tmpdir/scmroot/createrepo_c'...
$ git fetch origin 185bc1a709f2ec1d42e11f31c2d6e577babdf429:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/createrepo_c
 * [new ref]         185bc1a709f2ec1d42e11f31c2d6e577babdf429 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 185bc1a Specify a dependency on libzstd as in an upstream