$ git clone -n https://src.fedoraproject.org/rpms/grep.git /var/lib/mock/f40-build-2048565-48993/root/chroot_tmpdir/scmroot/grep
Cloning into '/var/lib/mock/f40-build-2048565-48993/root/chroot_tmpdir/scmroot/grep'...
$ git fetch origin 37218d9a1cea45401d570d22d8d341beb6f7d114:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/grep
 * [new ref]         37218d9a1cea45401d570d22d8d341beb6f7d114 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 37218d9 Updated SPDX license expression