$ git clone -n https://src.fedoraproject.org/rpms/wayvnc.git /var/lib/mock/f39-build-1725298-41233/root/chroot_tmpdir/scmroot/wayvnc
Cloning into '/var/lib/mock/f39-build-1725298-41233/root/chroot_tmpdir/scmroot/wayvnc'...
$ git fetch origin 618af68846591b6f75a5a68cc2ae9205e650d269:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/wayvnc
 * [new ref]         618af68846591b6f75a5a68cc2ae9205e650d269 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 618af68 New version