$ git clone -n https://src.fedoraproject.org/rpms/lib2geom.git /var/lib/mock/f40-build-739037-108618/root/chroot_tmpdir/scmroot/lib2geom
Cloning into '/var/lib/mock/f40-build-739037-108618/root/chroot_tmpdir/scmroot/lib2geom'...
$ git fetch origin 0103301922ba5e66ed817084a0e8b238402de888:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/lib2geom
 * [new ref]         0103301922ba5e66ed817084a0e8b238402de888 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0103301 add i686