$ git clone -n https://src.fedoraproject.org/rpms/xmlrpc-c.git /var/lib/mock/f40-build-796771-140845/root/chroot_tmpdir/scmroot/xmlrpc-c
Cloning into '/var/lib/mock/f40-build-796771-140845/root/chroot_tmpdir/scmroot/xmlrpc-c'...
$ git fetch origin 53b1fc3aa90a5265b2a15608cc014c667d17ba93:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xmlrpc-c
 * [new ref]         53b1fc3aa90a5265b2a15608cc014c667d17ba93 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 53b1fc3 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild