$ git clone -n https://src.fedoraproject.org/rpms/tigervnc.git /var/lib/mock/f40-build-1704324-24570/root/chroot_tmpdir/scmroot/tigervnc
Cloning into '/var/lib/mock/f40-build-1704324-24570/root/chroot_tmpdir/scmroot/tigervnc'...
$ git fetch origin 866c6b69e6af0649bdf8bdc50d39cc87589b7f12:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tigervnc
 * [new ref]         866c6b69e6af0649bdf8bdc50d39cc87589b7f12 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 866c6b6 1.14.0