$ git clone -n https://src.fedoraproject.org/rpms/tigervnc.git /var/lib/mock/f41-build-side-1-2670637-29060/root/chroot_tmpdir/scmroot/tigervnc
Cloning into '/var/lib/mock/f41-build-side-1-2670637-29060/root/chroot_tmpdir/scmroot/tigervnc'...
$ git fetch origin 5fb2f1d73cf1adfe0dde7ac0df2b80b95dc60891:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tigervnc
 * [new ref]         5fb2f1d73cf1adfe0dde7ac0df2b80b95dc60891 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5fb2f1d Move old log to log.old if present (fix patch)