$ git clone -n https://src.fedoraproject.org/rpms/mimedefang.git /var/lib/mock/f41-build-1022366-18070/root/chroot_tmpdir/scmroot/mimedefang
Cloning into '/var/lib/mock/f41-build-1022366-18070/root/chroot_tmpdir/scmroot/mimedefang'...
$ git fetch origin 10d92ba2fd6387fadcb7429fa348486636b984f8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mimedefang
 * [new ref]         10d92ba2fd6387fadcb7429fa348486636b984f8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 10d92ba Perl 5.40 rebuild