$ git clone -n https://src.fedoraproject.org/rpms/mingw-objfw.git /var/lib/mock/f45-build-18609-524/root/chroot_tmpdir/scmroot/mingw-objfw
Cloning into '/var/lib/mock/f45-build-18609-524/root/chroot_tmpdir/scmroot/mingw-objfw'...
$ git fetch origin 64bd56b89d3902dd21fba6d3738da23ef9902c80:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mingw-objfw
 * [new ref]         64bd56b89d3902dd21fba6d3738da23ef9902c80 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 64bd56b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild