$ git clone -n https://src.fedoraproject.org/rpms/libvncserver.git /var/lib/mock/f40-build-2008725-45405/root/chroot_tmpdir/scmroot/libvncserver
Cloning into '/var/lib/mock/f40-build-2008725-45405/root/chroot_tmpdir/scmroot/libvncserver'...
$ git fetch origin 0cb767b5d8b06ca00901e0efc86c9c3cbbfde55e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libvncserver
 * [new ref]         0cb767b5d8b06ca00901e0efc86c9c3cbbfde55e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0cb767b Update to 0.9.14 (#2155072)