$ git clone -n https://src.fedoraproject.org/rpms/dosbox-staging.git /var/lib/mock/f40-build-1931525-25121/root/chroot_tmpdir/scmroot/dosbox-staging
Cloning into '/var/lib/mock/f40-build-1931525-25121/root/chroot_tmpdir/scmroot/dosbox-staging'...
$ git fetch origin 20a739fc85df5b0b44a356e5c72d3389d8a37d83:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/dosbox-staging
 * [new ref]         20a739fc85df5b0b44a356e5c72d3389d8a37d83 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 20a739f Update to 0.81.2 (rhbz#2299159)