$ git clone -n https://src.fedoraproject.org/rpms/qqc2-breeze-style.git /var/lib/mock/f42-build-side-1-3512362-46069/root/chroot_tmpdir/scmroot/qqc2-breeze-style
Cloning into '/var/lib/mock/f42-build-side-1-3512362-46069/root/chroot_tmpdir/scmroot/qqc2-breeze-style'...
$ git fetch origin 5ecc8e7e168078f341568c7361f24cac9bc87489:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/qqc2-breeze-style
 * [new ref]         5ecc8e7e168078f341568c7361f24cac9bc87489 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5ecc8e7 6.3.4