$ git clone -n https://src.fedoraproject.org/rpms/xmlrpc-epi.git /var/lib/mock/f45-build-38966-730/root/chroot_tmpdir/scmroot/xmlrpc-epi
Cloning into '/var/lib/mock/f45-build-38966-730/root/chroot_tmpdir/scmroot/xmlrpc-epi'...
$ git fetch origin 763e65d2c7545f7e1d22749383c438fc2a4efb87:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xmlrpc-epi
 * [new ref]         763e65d2c7545f7e1d22749383c438fc2a4efb87 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 763e65d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild