$ git clone -n https://src.fedoraproject.org/rpms/flatpak-builder.git /var/lib/mock/f40-build-2065984-49274/root/chroot_tmpdir/scmroot/flatpak-builder
Cloning into '/var/lib/mock/f40-build-2065984-49274/root/chroot_tmpdir/scmroot/flatpak-builder'...
$ git fetch origin 3b2177605d5093794fcb59634c85c1df535134dc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/flatpak-builder
 * [new ref]         3b2177605d5093794fcb59634c85c1df535134dc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3b21776 Update to 1.4.0