$ git clone -n https://src.fedoraproject.org/rpms/novnc.git /var/lib/mock/f45-build-19778-555/root/chroot_tmpdir/scmroot/novnc
Cloning into '/var/lib/mock/f45-build-19778-555/root/chroot_tmpdir/scmroot/novnc'...
$ git fetch origin bb77258ba4c78b031fb9296400e7a8effce45cc3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/novnc
 * [new ref]         bb77258ba4c78b031fb9296400e7a8effce45cc3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bb77258 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild