$ git clone -n https://src.fedoraproject.org/rpms/flatpak-kcm.git /var/lib/mock/f42-build-side-1-3579602-46815/root/chroot_tmpdir/scmroot/flatpak-kcm
Cloning into '/var/lib/mock/f42-build-side-1-3579602-46815/root/chroot_tmpdir/scmroot/flatpak-kcm'...
$ git fetch origin 084a9dbbbc316f4a4ff1d940ddb45cdf54c19157:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/flatpak-kcm
 * [new ref]         084a9dbbbc316f4a4ff1d940ddb45cdf54c19157 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 084a9db 6.4.1