$ git clone -n https://src.fedoraproject.org/rpms/libecpint.git /var/lib/mock/f45-build-16149-483/root/chroot_tmpdir/scmroot/libecpint
Cloning into '/var/lib/mock/f45-build-16149-483/root/chroot_tmpdir/scmroot/libecpint'...
$ git fetch origin 65e02b3b144666688620abfc0f6961b8056c1013:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libecpint
 * [new ref]         65e02b3b144666688620abfc0f6961b8056c1013 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 65e02b3 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild