$ git clone -n https://src.fedoraproject.org/rpms/credentials-fetcher.git /var/lib/mock/f45-build-7026-355/root/chroot_tmpdir/scmroot/credentials-fetcher
Cloning into '/var/lib/mock/f45-build-7026-355/root/chroot_tmpdir/scmroot/credentials-fetcher'...
$ git fetch origin ea6e017b9c242caa202eb948d2bda3c82928d443:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/credentials-fetcher
 * [new ref]         ea6e017b9c242caa202eb948d2bda3c82928d443 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ea6e017 merge