$ git clone -n https://src.fedoraproject.org/rpms/fontconfig.git /var/lib/mock/f45-build-9156-399/root/chroot_tmpdir/scmroot/fontconfig
Cloning into '/var/lib/mock/f45-build-9156-399/root/chroot_tmpdir/scmroot/fontconfig'...
$ git fetch origin 08533c2effae657c07bcb6c3ae63767e83726a4f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fontconfig
 * [new ref]         08533c2effae657c07bcb6c3ae63767e83726a4f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 08533c2 New upstream release