$ git clone -n https://src.fedoraproject.org/rpms/libfm.git /var/lib/mock/f41-build-825393-154442/root/chroot_tmpdir/scmroot/libfm
Cloning into '/var/lib/mock/f41-build-825393-154442/root/chroot_tmpdir/scmroot/libfm'...
$ git fetch origin 331076b2f5b44ee96bd33fcc28575e7e28667fc8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libfm
 * [new ref]         331076b2f5b44ee96bd33fcc28575e7e28667fc8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 331076b update to the latest git