$ git clone -n https://src.fedoraproject.org/rpms/libb2.git /var/lib/mock/f40-build-785869-134131/root/chroot_tmpdir/scmroot/libb2
Cloning into '/var/lib/mock/f40-build-785869-134131/root/chroot_tmpdir/scmroot/libb2'...
$ git fetch origin a82694667b338e0b6120479a74a349b2fcf307cb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libb2
 * [new ref]         a82694667b338e0b6120479a74a349b2fcf307cb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a826946 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild