$ git clone -n https://src.fedoraproject.org/rpms/xwininfo.git /var/lib/mock/f45-build-39178-732/root/chroot_tmpdir/scmroot/xwininfo
Cloning into '/var/lib/mock/f45-build-39178-732/root/chroot_tmpdir/scmroot/xwininfo'...
$ git fetch origin a9748ca6c4289282fce0b94539295c0a869c39e6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xwininfo
 * [new ref]         a9748ca6c4289282fce0b94539295c0a869c39e6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a9748ca rebuilt with meson build system