$ git clone -n https://src.fedoraproject.org/rpms/falkon.git /var/lib/mock/f40-build-2074550-49421/root/chroot_tmpdir/scmroot/falkon
Cloning into '/var/lib/mock/f40-build-2074550-49421/root/chroot_tmpdir/scmroot/falkon'...
$ git fetch origin 3a282543ef37be035f13ec3d753dd5f20437519a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/falkon
 * [new ref]         3a282543ef37be035f13ec3d753dd5f20437519a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3a28254 24.01.80