$ git clone -n https://src.fedoraproject.org/rpms/american-fuzzy-lop.git /var/lib/mock/f38-build-side-42-init-devel-1032842-29729/root/chroot_tmpdir/scmroot/american-fuzzy-lop
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1032842-29729/root/chroot_tmpdir/scmroot/american-fuzzy-lop'...
$ git fetch origin 356dae2b7123eb97330c19ac0e4ecd6afcf11db6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/american-fuzzy-lop
 * [new ref]         356dae2b7123eb97330c19ac0e4ecd6afcf11db6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 356dae2 Add missing sources