$ git clone -n https://src.fedoraproject.org/rpms/rust-cxxbridge-cmd.git /var/lib/mock/f45-build-41131-779/root/chroot_tmpdir/scmroot/rust-cxxbridge-cmd
Cloning into '/var/lib/mock/f45-build-41131-779/root/chroot_tmpdir/scmroot/rust-cxxbridge-cmd'...
$ git fetch origin bf6e1d9d632d6ac8201d75f36808f6268f66638e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-cxxbridge-cmd
 * [new ref]         bf6e1d9d632d6ac8201d75f36808f6268f66638e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bf6e1d9 Update to version 1.0.200; Fixes RHBZ#2528932