$ git clone -n https://src.fedoraproject.org/rpms/gnome-usage.git /var/lib/mock/f42-build-3414396-45151/root/chroot_tmpdir/scmroot/gnome-usage
Cloning into '/var/lib/mock/f42-build-3414396-45151/root/chroot_tmpdir/scmroot/gnome-usage'...
$ git fetch origin 45dfbbbf643c65775358ddeb4312801a699c0155:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnome-usage
 * [new ref]         45dfbbbf643c65775358ddeb4312801a699c0155 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 45dfbbb Update to 48.rc