$ git clone -n https://src.fedoraproject.org/rpms/bibutils.git /var/lib/mock/f40-build-2234800-53413/root/chroot_tmpdir/scmroot/bibutils
Cloning into '/var/lib/mock/f40-build-2234800-53413/root/chroot_tmpdir/scmroot/bibutils'...
$ git fetch origin a559fc2fb4484b84a805ebea78aa37bf1288bfa8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/bibutils
 * [new ref]         a559fc2fb4484b84a805ebea78aa37bf1288bfa8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a559fc2 Fix flatpak build