fix: read harvest.yml from HARVEST_CONF when set

cmd/admin/admin.go

@@ -223,7 +223,7 @@ func doTLS(_ *cobra.Command, _ []string) {
 
 func doAdmin(c *cobra.Command, _ []string) {
 	var configPath = c.Root().PersistentFlags().Lookup("config").Value.String()
-	err := conf.LoadHarvestConfig(configPath)
+	_, err := conf.LoadHarvestConfig(configPath)
 	if err != nil {
 		return
 	}

cmd/collectors/unix/main.go

@@ -280,7 +280,7 @@ func (u *Unix) PollInstance() (map[string]*matrix.Matrix, error) {
 	currInstances := set.NewFrom(mat.GetInstanceKeys())
 	currSize := currInstances.Size()
 
-	err := conf.LoadHarvestConfig(u.Options.Config)
+	_, err := conf.LoadHarvestConfig(u.Options.Config)
 	if err != nil {
 		return nil, err
 	}

cmd/exporters/influxdb/influxdb_test.go

@@ -15,7 +15,7 @@ func setupInfluxDB(t *testing.T, exporterName string) *InfluxDB {
 	opts := options.New()
 	opts.Debug = true
 
-	err := conf.LoadHarvestConfig("../../tools/doctor/testdata/testConfig.yml")
+	_, err := conf.LoadHarvestConfig("../../tools/doctor/testdata/testConfig.yml")
 	if err != nil {
 		panic(err)
 	}

cmd/harvest/harvest.go

@@ -101,7 +101,8 @@ func doManageCmd(cmd *cobra.Command, args []string) {
 
 	// cmd.DebugFlags()  // uncomment to print flags
 
-	if err = conf.LoadHarvestConfig(opts.config); err != nil {
+	_, err = conf.LoadHarvestConfig(opts.config)
+	if err != nil {
 		if os.IsNotExist(err) {
 			log.Fatalf("config [%s]: not found\n", opts.config)
 		}

cmd/poller/poller.go

@@ -129,12 +129,16 @@ type Poller struct {
 // starts collectors and exporters
 func (p *Poller) Init() error {
 
-	var err error
+	var (
+		err                   error
+		fileLoggingEnabled    bool
+		consoleLoggingEnabled bool
+		configPath            string
+	)
+
 	p.options = opts.SetDefaults()
 	p.name = opts.Poller
 
-	var fileLoggingEnabled bool
-	var consoleLoggingEnabled bool
 	zeroLogLevel := logging.GetZerologLevel(p.options.LogLevel)
 	// if we are a daemon, use file logging
 	if p.options.Daemon {
@@ -147,18 +151,24 @@ func (p *Poller) Init() error {
 		logFileName = "poller_" + p.name + ".log"
 	}
 
-	err = conf.LoadHarvestConfig(p.options.Config)
+	configPath, err = conf.LoadHarvestConfig(p.options.Config)
 	if err != nil {
 		// separate logger is not yet configured as it depends on setting logMaxMegaBytes, logMaxFiles later
 		// Using default instance of logger which logs below error to harvest.log
 		logging.Get().SubLogger("Poller", p.name).Error().
-			Str("config", p.options.Config).Err(err).Msg("Unable to read config")
+			Str("config", p.options.Config).
+			Str("configPath", configPath).
+			Err(err).
+			Msg("Unable to read config")
 		return err
 	}
 	p.params, err = conf.PollerNamed(p.name)
 	if err != nil {
 		logging.Get().SubLogger("Poller", p.name).Error().
-			Str("config", p.options.Config).Err(err).Msg("Failed to find poller")
+			Str("config", p.options.Config).
+			Str("configPath", configPath).
+			Err(err).
+			Msg("Failed to find poller")
 		return err
 	}
 
@@ -199,6 +209,7 @@ func (p *Poller) Init() error {
 
 	logger.Info().
 		Str("logLevel", zeroLogLevel.String()).
+		Str("configPath", configPath).
 		Str("version", strings.TrimSpace(version.String())).
 		EmbedObject(p.options).
 		Msg("Init")

cmd/tools/generate/generate.go

@@ -150,7 +150,7 @@ func generateDocker(path string, kind int) {
 		opts.grafanaPort,
 		opts.promPort,
 	}
-	err := conf.LoadHarvestConfig(path)
+	_, err := conf.LoadHarvestConfig(path)
 	if err != nil {
 		logErrAndExit(err)
 	}
@@ -348,7 +348,7 @@ func silentClose(body io.ReadCloser) {
 
 func generateSystemd(path string) {
 	var adminService string
-	err := conf.LoadHarvestConfig(path)
+	_, err := conf.LoadHarvestConfig(path)
 	if err != nil {
 		logErrAndExit(err)
 	}
@@ -430,7 +430,7 @@ func generateMetrics(path string) {
 		zapiClient *zapi.Client
 	)
 
-	err = conf.LoadHarvestConfig(path)
+	_, err = conf.LoadHarvestConfig(path)
 	if err != nil {
 		logErrAndExit(err)
 	}

cmd/tools/grafana/grafana.go

@@ -351,7 +351,7 @@ func newLabelVar(label string) []byte {
 
 func doImport(_ *cobra.Command, _ []string) {
 	opts.command = "import"
-	err := conf.LoadHarvestConfig(opts.config)
+	_, err := conf.LoadHarvestConfig(opts.config)
 	if err != nil {
 		return
 	}
@@ -731,7 +731,7 @@ func checkToken(opts *options, ignoreConfig bool, tries int) error {
 
 	configPath = opts.config
 
-	err = conf.LoadHarvestConfig(configPath)
+	_, err = conf.LoadHarvestConfig(configPath)
 	if err != nil {
 		return err
 	}

cmd/tools/rest/rest.go

@@ -112,7 +112,7 @@ func doShow(_ *cobra.Command, a []string) {
 	if !c.isValid {
 		return
 	}
-	err := conf.LoadHarvestConfig(args.Config)
+	_, err := conf.LoadHarvestConfig(args.Config)
 	if err != nil {
 		log.Fatal(err)
 	}

cmd/tools/zapi/zapi.go

@@ -129,7 +129,7 @@ func doCmd(cmd string) {
 		connection *client.Client
 	)
 
-	err = conf.LoadHarvestConfig(args.Config)
+	_, err = conf.LoadHarvestConfig(args.Config)
 	if err != nil {
 		log.Fatal(err)
 	}

integration/test/metric_test.go

@@ -25,7 +25,7 @@ var skipDuplicates = map[string]bool{
 
 func TestPollerMetrics(t *testing.T) {
 	utils.SkipIfMissing(t, utils.Regression)
-	err := conf.LoadHarvestConfig(installer.HarvestConfigFile)
+	_, err := conf.LoadHarvestConfig(installer.HarvestConfigFile)
 	if err != nil {
 		log.Fatal().Err(err).Msg("Unable to load harvest config")
 	}

integration/test/utils/utils.go

@@ -248,7 +248,7 @@ func WriteToken(token string) {
 	var err error
 	filename := "harvest.yml"
 	abs, _ := filepath.Abs(filename)
-	err = conf.LoadHarvestConfig(filename)
+	_, err = conf.LoadHarvestConfig(filename)
 	PanicIfNotNil(err)
 	tools := conf.Config.Tools
 	if tools != nil {

pkg/conf/conf.go

@@ -36,44 +36,44 @@ func TestLoadHarvestConfig(configPath string) {
 	configRead = false
 	Config = HarvestConfig{}
 	promPortRangeMapping = make(map[string]PortMap)
-	err := LoadHarvestConfig(configPath)
+	_, err := LoadHarvestConfig(configPath)
 	if err != nil {
 		log.Fatalf("Failed to load config at=[%s] err=%+v\n", configPath, err)
 	}
 }
 
 func ConfigPath(path string) string {
 	// Harvest uses the following precedence order. Each item takes precedence over the
-	// item below it:
-	// 1. --config command line flag
-	// 2. HARVEST_CONFIG environment variable
+	// item below it. All paths are relative to `HARVEST_CONF` environment variable
+	// 1. `--config` command line flag
+	// 2. `HARVEST_CONFIG` environment variable
 	// 3. no command line argument and no environment variable, use the default path (HarvestYML)
 	if path != HarvestYML && path != "./"+HarvestYML {
-		return path
+		return Path(path)
 	}
 	fp := os.Getenv("HARVEST_CONFIG")
-	if fp == "" {
-		return path
+	if fp != "" {
+		path = fp
 	}
-	return fp
+	return Path(path)
 }
 
-func LoadHarvestConfig(configPath string) error {
+func LoadHarvestConfig(configPath string) (string, error) {
+	configPath = ConfigPath(configPath)
 	if configRead {
-		return nil
+		return configPath, nil
 	}
-	configPath = ConfigPath(configPath)
 	contents, err := os.ReadFile(configPath)
 
 	if err != nil {
-		return fmt.Errorf("error reading %s err=%w", configPath, err)
+		return "", fmt.Errorf("error reading %s err=%w", configPath, err)
 	}
 	err = DecodeConfig(contents)
 	if err != nil {
 		fmt.Printf("error unmarshalling config file=[%s] %+v\n", configPath, err)
-		return err
+		return "", err
 	}
-	return nil
+	return configPath, nil
 }
 
 func DecodeConfig(contents []byte) error {

pkg/conf/conf_test.go

@@ -281,3 +281,23 @@ func TestNodeToPoller(t *testing.T) {
 	testArg(t, "30s", poller.ClientTimeout)
 	testArg(t, "true", strconv.FormatBool(*poller.UseInsecureTLS))
 }
+
+func TestReadHarvestConfigFromEnv(t *testing.T) {
+	t.Helper()
+	configRead = false
+	Config = HarvestConfig{}
+	t.Setenv(HomeEnvVar, "testdata")
+	cp, err := LoadHarvestConfig(HarvestYML)
+	if err != nil {
+		t.Errorf("Failed to load config at=[%s] err=%+v\n", HarvestYML, err)
+		return
+	}
+	wantCp := "testdata/harvest.yml"
+	if cp != wantCp {
+		t.Errorf("configPath got=%s want=%s", cp, wantCp)
+	}
+	poller := Config.Pollers["star"]
+	if poller == nil {
+		t.Errorf("check if star poller exists. got=nil want=poller")
+	}
+}

pkg/conf/testdata/harvest.yml

@@ -0,0 +1,6 @@
+
+Pollers:
+  star:
+    addr: localhost
+    collectors:
+      - Simple