Method WriteDockerComposeYAML

pkg/ddevapp/compose_yaml.go:23–123

WriteDockerComposeYAML writes a .ddev-docker-compose-base.yaml and related to the .ddev directory. It then uses `docker-compose convert` to get a canonical version of the full compose file. It then makes a couple of fixups to the canonical version (networks and approot bind points) by marshaling the

()

// It then makes a couple of fixups to the canonical version (networks and approot bind points) by
// marshaling the canonical version to YAML and then unmarshaling it back into a canonical version.
func (app *DdevApp) WriteDockerComposeYAML() error {
	var err error

	// Create a host working_dir for the web service beforehand.
	// Otherwise, Docker will create it as root user (when Mutagen is disabled).
	// This problem (particularly for Docker volumes) is described in
	// https://github.com/moby/moby/issues/2259
	hostWorkingDir := app.GetHostWorkingDir("web", "")
	if hostWorkingDir != "" {
		_ = os.MkdirAll(hostWorkingDir, 0755)
	}

	rendered, err := app.RenderComposeYAML()
	if err != nil {
		return err
	}

	baseYAMLPath := app.DockerComposeYAMLPath()
	baseContentBytes := []byte(rendered)

	// If the file already exists and has the same content, don't overwrite it.
	skipBaseWrite := false
	if existingContent, err := os.ReadFile(baseYAMLPath); err == nil {
		if bytes.Equal(baseContentBytes, existingContent) {
			skipBaseWrite = true
		}
	}

	if !skipBaseWrite {
		f, err := os.Create(baseYAMLPath)
		if err != nil {
			return err
		}
		defer util.CheckClose(f)

		_, err = f.Write(baseContentBytes)
		if err != nil {
			return err
		}
	}

	files, err := app.ComposeFiles()
	if err != nil {
		return err
	}
	envFiles, err := app.EnvFiles()
	if err != nil {
		return err
	}
	var action []string
	for _, envFile := range envFiles {
		action = append(action, "--env-file", envFile)
	}
	fullContents, _, err := dockerutil.ComposeCmd(&dockerutil.ComposeCmdOpts{
		ComposeFiles: files,
		Profiles:     []string{`*`},
		Action:       append(action, "config"),
	})