Simple Go function to pipe an `exec.Cmd` to `jq`

pipe.go

package pipe

func shell2jq(ctx context.Context, jqScript string, command string, args ...string) (string, error) {
	// Here be dragons
	var (
		cmd  = exec.CommandContext(ctx, command, args...)
		jq   = exec.CommandContext(ctx, "jq", "-r", jqScript)
		r, w = io.Pipe()
		g    = new(errgroup.Group)
		out  bytes.Buffer
	)

	// pipe the commands
	jq.Stdin, cmd.Stdout = r, w

	cmd.Stderr = os.Stderr
	jq.Stderr = os.Stderr

	jq.Stdout = &out

	g.Go(func() error {
		defer w.Close()
		if err := cmd.Run(); err != nil {
			return fmt.Errorf("running %s: %w", cmd, err)
		}
		return nil
	})
	g.Go(func() error {
		defer r.Close()
		if err := jq.Run(); err != nil {
			return fmt.Errorf("running %s: %w", jq, err)
		}
		return nil
	})

	if err := g.Wait(); err != nil {
		return "", err
	}

	return strings.TrimSpace(out.String()), nil
}