$ git clone -n https://src.fedoraproject.org/rpms/rust-clap2.git /var/lib/mock/f42-build-side-1-3539506-46565/root/chroot_tmpdir/scmroot/rust-clap2
Cloning into '/var/lib/mock/f42-build-side-1-3539506-46565/root/chroot_tmpdir/scmroot/rust-clap2'...
$ git fetch origin 52c08168a2f5e4bcc1472d38c2ef4aa71fef5615:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-clap2
 * [new ref]         52c08168a2f5e4bcc1472d38c2ef4aa71fef5615 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 52c0816 Drop atty dependency and replace with std::io::IsTerminal