$ git clone -n https://src.fedoraproject.org/rpms/fontconfig.git /var/lib/mock/f39-build-1696877-41181/root/chroot_tmpdir/scmroot/fontconfig
Cloning into '/var/lib/mock/f39-build-1696877-41181/root/chroot_tmpdir/scmroot/fontconfig'...
$ git fetch origin 1b1dff013739b4acf986e080ffb2ed5157bcf896:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fontconfig
 * [new ref]         1b1dff013739b4acf986e080ffb2ed5157bcf896 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1b1dff0 Bump a release