$ git clone -n https://src.fedoraproject.org/rpms/fontconfig.git /var/lib/mock/f40-build-786631-134471/root/chroot_tmpdir/scmroot/fontconfig
Cloning into '/var/lib/mock/f40-build-786631-134471/root/chroot_tmpdir/scmroot/fontconfig'...
$ git fetch origin e200ccfc726f40f54e5695afbeb37efe2209f7e2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fontconfig
 * [new ref]         e200ccfc726f40f54e5695afbeb37efe2209f7e2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e200ccf Delete .uuid with fc-cache -f.