$ git clone -n https://src.fedoraproject.org/rpms/ghc-union-find.git /var/lib/mock/f41-build-837892-159471/root/chroot_tmpdir/scmroot/ghc-union-find
Cloning into '/var/lib/mock/f41-build-837892-159471/root/chroot_tmpdir/scmroot/ghc-union-find'...
$ git fetch origin 68ee7b4cfe36506cb0ad3c2886b328a38cc63192:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-union-find
 * [new ref]         68ee7b4cfe36506cb0ad3c2886b328a38cc63192 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 68ee7b4 bump base bound