$ git clone -n https://src.fedoraproject.org/rpms/qqc2-breeze-style.git /var/lib/mock/f41-build-837160-158989/root/chroot_tmpdir/scmroot/qqc2-breeze-style
Cloning into '/var/lib/mock/f41-build-837160-158989/root/chroot_tmpdir/scmroot/qqc2-breeze-style'...
$ git fetch origin 8134e6fdf0bf8d6ce9e5225376d88f4aca37f92e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/qqc2-breeze-style
 * [new ref]         8134e6fdf0bf8d6ce9e5225376d88f4aca37f92e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8134e6f rebuild