$ git clone -n https://src.fedoraproject.org/rpms/ghc-path-pieces.git /var/lib/mock/f45-build-10576-419/root/chroot_tmpdir/scmroot/ghc-path-pieces
Cloning into '/var/lib/mock/f45-build-10576-419/root/chroot_tmpdir/scmroot/ghc-path-pieces'...
$ git fetch origin efa7cebd245ad6c8737069faa696ffc0897e592b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-path-pieces
 * [new ref]         efa7cebd245ad6c8737069faa696ffc0897e592b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at efa7ceb Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild