$ git clone -n https://src.fedoraproject.org/rpms/R-RcppCCTZ.git /var/lib/mock/f45-build-5912-345/root/chroot_tmpdir/scmroot/R-RcppCCTZ
Cloning into '/var/lib/mock/f45-build-5912-345/root/chroot_tmpdir/scmroot/R-RcppCCTZ'...
$ git fetch origin 7e0c095bc9ad792c491bafb5521b56808517f2fd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-RcppCCTZ
 * [new ref]         7e0c095bc9ad792c491bafb5521b56808517f2fd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7e0c095 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild