$ git clone -n https://src.fedoraproject.org/rpms/qm.git /var/lib/mock/f42-build-side-1-3500795-45971/root/chroot_tmpdir/scmroot/qm
Cloning into '/var/lib/mock/f42-build-side-1-3500795-45971/root/chroot_tmpdir/scmroot/qm'...
$ git fetch origin 0034f7740734fb5bb51a01d2342ad28515b3f9f5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/qm
 * [new ref]         0034f7740734fb5bb51a01d2342ad28515b3f9f5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0034f77 Update to 0.7.4 upstream release