$ git clone -n https://src.fedoraproject.org/rpms/nemo.git /var/lib/mock/f40-build-2238559-53579/root/chroot_tmpdir/scmroot/nemo
Cloning into '/var/lib/mock/f40-build-2238559-53579/root/chroot_tmpdir/scmroot/nemo'...
$ git fetch origin 5277b27f1952b65679dd6ef37abd4252b220d3c9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nemo
 * [new ref]         5277b27f1952b65679dd6ef37abd4252b220d3c9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5277b27 Add buildrequires python3-packaging