$ git clone -n https://src.fedoraproject.org/rpms/mingw-headers.git /var/lib/mock/f45-build-18488-519/root/chroot_tmpdir/scmroot/mingw-headers
Cloning into '/var/lib/mock/f45-build-18488-519/root/chroot_tmpdir/scmroot/mingw-headers'...
$ git fetch origin d6839f62aa0926e1db85181771670f3aa4d0767d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mingw-headers
 * [new ref]         d6839f62aa0926e1db85181771670f3aa4d0767d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d6839f6 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild