$ git clone -n https://src.fedoraproject.org/rpms/subunit.git /var/lib/mock/f40-build-750579-115129/root/chroot_tmpdir/scmroot/subunit
Cloning into '/var/lib/mock/f40-build-750579-115129/root/chroot_tmpdir/scmroot/subunit'...
$ git fetch origin e82d53bcbfae00e88dca0f96340b33637fe43d83:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/subunit
 * [new ref]         e82d53bcbfae00e88dca0f96340b33637fe43d83 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e82d53b Version 1.4.4