$ git clone -n https://src.fedoraproject.org/rpms/elements.git /var/lib/mock/f38-build-711212-93756/root/chroot_tmpdir/scmroot/elements
Cloning into '/var/lib/mock/f38-build-711212-93756/root/chroot_tmpdir/scmroot/elements'...
$ git fetch origin 375bca9b5691cb045fd25424ee1455369e33dbd7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/elements
 * [new ref]         375bca9b5691cb045fd25424ee1455369e33dbd7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 375bca9 Update sources