$ git clone -n https://src.fedoraproject.org/rpms/mimedefang.git /var/lib/mock/f45-build-18335-513/root/chroot_tmpdir/scmroot/mimedefang
Cloning into '/var/lib/mock/f45-build-18335-513/root/chroot_tmpdir/scmroot/mimedefang'...
$ git fetch origin 8c78ba272edcf5f1c6128196f405607dd251dbd5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mimedefang
 * [new ref]         8c78ba272edcf5f1c6128196f405607dd251dbd5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8c78ba2 Perl 5.44 rebuild