$ git clone -n https://src.fedoraproject.org/rpms/rust-rfc2047-decoder.git /var/lib/mock/f45-build-44377-813/root/chroot_tmpdir/scmroot/rust-rfc2047-decoder
Cloning into '/var/lib/mock/f45-build-44377-813/root/chroot_tmpdir/scmroot/rust-rfc2047-decoder'...
$ git fetch origin afa65954f4dd7f778a0f08c604f934e04612cf1a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rfc2047-decoder
 * [new ref]         afa65954f4dd7f778a0f08c604f934e04612cf1a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at afa6595 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild