$ git clone -n https://src.fedoraproject.org/rpms/nexus.git /var/lib/mock/f42-build-864677-172514/root/chroot_tmpdir/scmroot/nexus
Cloning into '/var/lib/mock/f42-build-864677-172514/root/chroot_tmpdir/scmroot/nexus'...
$ git fetch origin 924390d1253e0071a720460aa48a92446abffc53:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nexus
 * [new ref]         924390d1253e0071a720460aa48a92446abffc53 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 924390d Rebuild for hdf5 1.14.5