$ git clone -n https://src.fedoraproject.org/rpms/buildstream.git /var/lib/mock/f40-build-2632983-65911/root/chroot_tmpdir/scmroot/buildstream
Cloning into '/var/lib/mock/f40-build-2632983-65911/root/chroot_tmpdir/scmroot/buildstream'...
$ git fetch origin ab266886f5037f15e30ffaf5e09012850549abb6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/buildstream
 * [new ref]         ab266886f5037f15e30ffaf5e09012850549abb6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ab26688 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild