Function aptlyGraph

cmd/graph.go:18–101

(cmd *commander.Command, args []string)

)

func aptlyGraph(cmd *commander.Command, args []string) error {
	var err error

	if len(args) != 0 {
		cmd.Usage()
		return commander.ErrCommandError
	}

	layout := context.Flags().Lookup("layout").Value.String()

	fmt.Printf("Generating graph...\n")
	collectionFactory := context.NewCollectionFactory()
	graph, err := deb.BuildGraph(collectionFactory, layout)
	if err != nil {
		return err
	}

	buf := bytes.NewBufferString(graph.String())

	tempfile, err := os.CreateTemp("", "aptly-graph")
	if err != nil {
		return err
	}
	_ = tempfile.Close()
	_ = os.Remove(tempfile.Name())

	format := context.Flags().Lookup("format").Value.String()
	output := context.Flags().Lookup("output").Value.String()

	if filepath.Ext(output) != "" {
		format = filepath.Ext(output)[1:]
	}

	tempfilename := tempfile.Name() + "." + format

	command := exec.Command("dot", "-T"+format, "-o"+tempfilename)
	command.Stderr = os.Stderr

	stdin, err := command.StdinPipe()
	if err != nil {
		return err
	}

	err = command.Start()
	if err != nil {
		return fmt.Errorf("unable to execute dot: %s (is graphviz package installed?)", err)
	}

	_, err = io.Copy(stdin, buf)
	if err != nil {
		return err
	}

	err = stdin.Close()
	if err != nil {
		return err
	}