$ git clone -n https://src.fedoraproject.org/rpms/389-ds-base.git /var/lib/mock/f40-build-1930403-25111/root/chroot_tmpdir/scmroot/389-ds-base
Cloning into '/var/lib/mock/f40-build-1930403-25111/root/chroot_tmpdir/scmroot/389-ds-base'...
$ git fetch origin f0da45153f7dfe4060feddf6d8ff19b9b0cd05f5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/389-ds-base
 * [new ref]         f0da45153f7dfe4060feddf6d8ff19b9b0cd05f5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f0da451 Replace lmdb with lmdb-libs in Requires