$ git clone -n https://src.fedoraproject.org/rpms/man-db.git /var/lib/mock/f40-build-2211457-52216/root/chroot_tmpdir/scmroot/man-db
Cloning into '/var/lib/mock/f40-build-2211457-52216/root/chroot_tmpdir/scmroot/man-db'...
$ git fetch origin df711152ef4c6b9980356e5adffe7691a20de30c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/man-db
 * [new ref]         df711152ef4c6b9980356e5adffe7691a20de30c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at df71115 Fix the Source numbering in installation