$ git clone -n https://src.fedoraproject.org/rpms/rubygem-xmlrpc.git /var/lib/mock/f40-build-2323670-58730/root/chroot_tmpdir/scmroot/rubygem-xmlrpc
Cloning into '/var/lib/mock/f40-build-2323670-58730/root/chroot_tmpdir/scmroot/rubygem-xmlrpc'...
$ git fetch origin 28b4b1f1bcf28b0d033c37bf17e23d9e687ec0a5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-xmlrpc
 * [new ref]         28b4b1f1bcf28b0d033c37bf17e23d9e687ec0a5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 28b4b1f Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild