$ git clone -n https://src.fedoraproject.org/rpms/rust-rspec.git /var/lib/mock/f45-build-44487-814/root/chroot_tmpdir/scmroot/rust-rspec
Cloning into '/var/lib/mock/f45-build-44487-814/root/chroot_tmpdir/scmroot/rust-rspec'...
$ git fetch origin c248ce6c558567a30738f9daac28b43e523521d4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rspec
 * [new ref]         c248ce6c558567a30738f9daac28b43e523521d4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c248ce6 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild