$ git clone -n https://src.fedoraproject.org/rpms/xeus.git /var/lib/mock/f40-build-1951151-25188/root/chroot_tmpdir/scmroot/xeus
Cloning into '/var/lib/mock/f40-build-1951151-25188/root/chroot_tmpdir/scmroot/xeus'...
$ git fetch origin e6af7f730e0e067f9df95d2e59f0b9079c10d949:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xeus
 * [new ref]         e6af7f730e0e067f9df95d2e59f0b9079c10d949 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e6af7f7 Update to 3.2.0