Add an option to set config

cmd/lotus/daemon.go

@@ -127,6 +127,10 @@ var DaemonCmd = &cli.Command{
 			Usage: "manage open file limit",
 			Value: true,
 		},
+		&cli.StringFlag{
+			Name:  "config",
+			Usage: "specify path of config file to use",
+		},
 	},
 	Action: func(cctx *cli.Context) error {
 		err := runmetrics.Enable(runmetrics.RunMetricOptions{
@@ -184,6 +188,10 @@ var DaemonCmd = &cli.Command{
 			return xerrors.Errorf("repo init error: %w", err)
 		}
 
+		if cctx.String("config") != "" {
+			r.SetConfigPath(cctx.String("config"))
+		}
+
 		if err := paramfetch.GetParams(lcli.ReqContext(cctx), build.ParametersJSON(), 0); err != nil {
 			return xerrors.Errorf("fetching proof parameters: %w", err)
 		}

node/repo/fsrepo.go

@@ -65,7 +65,8 @@ var ErrRepoExists = xerrors.New("repo exists")
 
 // FsRepo is struct for repo, use NewFS to create
 type FsRepo struct {
-	path string
+	path       string
+	configPath string
 }
 
 var _ Repo = &FsRepo{}
@@ -78,10 +79,15 @@ func NewFS(path string) (*FsRepo, error) {
 	}
 
 	return &FsRepo{
-		path: path,
+		path:       path,
+		configPath: filepath.Join(path, fsConfig),
 	}, nil
 }
 
+func (fsr *FsRepo) SetConfigPath(cfgPath string) {
+	fsr.configPath = cfgPath
+}
+
 func (fsr *FsRepo) Exists() (bool, error) {
 	_, err := os.Stat(filepath.Join(fsr.path, fsDatastore))
 	notexist := os.IsNotExist(err)
@@ -115,17 +121,15 @@ func (fsr *FsRepo) Init(t RepoType) error {
 }
 
 func (fsr *FsRepo) initConfig(t RepoType) error {
-	cfgP := filepath.Join(fsr.path, fsConfig)
-
-	_, err := os.Stat(cfgP)
+	_, err := os.Stat(fsr.configPath)
 	if err == nil {
 		// exists
 		return nil
 	} else if !os.IsNotExist(err) {
 		return err
 	}
 
-	c, err := os.Create(cfgP)
+	c, err := os.Create(fsr.configPath)
 	if err != nil {
 		return err
 	}
@@ -215,16 +219,18 @@ func (fsr *FsRepo) Lock(repoType RepoType) (LockedRepo, error) {
 		return nil, xerrors.Errorf("could not lock the repo: %w", err)
 	}
 	return &fsLockedRepo{
-		path:     fsr.path,
-		repoType: repoType,
-		closer:   closer,
+		path:       fsr.path,
+		configPath: fsr.configPath,
+		repoType:   repoType,
+		closer:     closer,
 	}, nil
 }
 
 type fsLockedRepo struct {
-	path     string
-	repoType RepoType
-	closer   io.Closer
+	path       string
+	configPath string
+	repoType   RepoType
+	closer     io.Closer
 
 	ds     map[string]datastore.Batching
 	dsErr  error
@@ -277,7 +283,7 @@ func (fsr *fsLockedRepo) Config() (interface{}, error) {
 }
 
 func (fsr *fsLockedRepo) loadConfigFromDisk() (interface{}, error) {
-	return config.FromFile(fsr.join(fsConfig), defConfForType(fsr.repoType))
+	return config.FromFile(fsr.configPath, defConfForType(fsr.repoType))
 }
 
 func (fsr *fsLockedRepo) SetConfig(c func(interface{})) error {
@@ -306,7 +312,7 @@ func (fsr *fsLockedRepo) SetConfig(c func(interface{})) error {
 	}
 
 	// write buffer of TOML bytes to config file
-	err = ioutil.WriteFile(fsr.join(fsConfig), buf.Bytes(), 0644)
+	err = ioutil.WriteFile(fsr.configPath, buf.Bytes(), 0644)
 	if err != nil {
 		return err
 	}