$ git clone -n https://src.fedoraproject.org/rpms/fwupd.git /var/lib/mock/f40-build-1931448-25121/root/chroot_tmpdir/scmroot/fwupd
Cloning into '/var/lib/mock/f40-build-1931448-25121/root/chroot_tmpdir/scmroot/fwupd'...
$ git fetch origin 08c39f3579f975c100ca635bc4c693a298f1a9c3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fwupd
 * [new ref]         08c39f3579f975c100ca635bc4c693a298f1a9c3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 08c39f3 New upstream release