Function getModuleVersions

cmd/gomobile/bind.go:242–318

getModuleVersions returns a module information at the directory src.

(targetPlatform string, targetArch string, src string)

// getModuleVersions returns a module information at the directory src.
func getModuleVersions(targetPlatform string, targetArch string, src string) (*modfile.File, error) {
	cmd := exec.Command("go", "list")
	cmd.Env = append(os.Environ(), "GOOS="+platformOS(targetPlatform), "GOARCH="+targetArch)

	tags := append(buildTags[:], platformTags(targetPlatform)...)

	// TODO(hyangah): probably we don't need to add all the dependencies.
	cmd.Args = append(cmd.Args, "-m", "-json", "-tags="+strings.Join(tags, ","), "all")
	cmd.Dir = src

	output, err := cmd.Output()
	if err != nil {
		// Module information is not available at src.
		return nil, nil
	}

	type Module struct {
		Main    bool
		Path    string
		Version string
		Dir     string
		Replace *Module
	}

	f := &modfile.File{}
	if err := f.AddModuleStmt("gobind"); err != nil {
		return nil, err
	}
	e := json.NewDecoder(bytes.NewReader(output))
	for {
		var mod *Module
		err := e.Decode(&mod)
		if err != nil && err != io.EOF {
			return nil, err
		}
		if mod != nil {
			if mod.Replace != nil {
				p, v := mod.Replace.Path, mod.Replace.Version
				if modfile.IsDirectoryPath(p) {
					// replaced by a local directory
					p = mod.Replace.Dir
				}
				if err := f.AddReplace(mod.Path, mod.Version, p, v); err != nil {
					return nil, err
				}
			} else {
				// When the version part is empty, the module is local and mod.Dir represents the location.
				if v := mod.Version; v == "" {
					if err := f.AddReplace(mod.Path, mod.Version, mod.Dir, ""); err != nil {
						return nil, err
					}
				} else {
					if err := f.AddRequire(mod.Path, v); err != nil {
						return nil, err
					}
				}
			}
		}