$ git clone -n https://src.fedoraproject.org/rpms/atomes.git /var/lib/mock/f39-build-1717498-41229/root/chroot_tmpdir/scmroot/atomes
Cloning into '/var/lib/mock/f39-build-1717498-41229/root/chroot_tmpdir/scmroot/atomes'...
$ git fetch origin 8c1cc566b554087ad58662fdc73fa2c23bc2eca1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/atomes
 * [new ref]         8c1cc566b554087ad58662fdc73fa2c23bc2eca1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8c1cc56 Package metadata update