$ git clone -n https://src.fedoraproject.org/rpms/python-fastar.git /var/lib/mock/f45-build-39738-751/root/chroot_tmpdir/scmroot/python-fastar
Cloning into '/var/lib/mock/f45-build-39738-751/root/chroot_tmpdir/scmroot/python-fastar'...
$ git fetch origin 7fba107979b704107d2985e17e32ba235c7a92ea:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-fastar
 * [new ref]         7fba107979b704107d2985e17e32ba235c7a92ea -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7fba107 Update to 0.12.0 (close RHBZ#2520160)