Merge pull request #612 from huskyii/enhance_cli_config

CHANGELOG.md

@@ -22,6 +22,7 @@
   - This change disables the logs by default
 - Use [Prometheus]'s duration parser, supporting days (`d`), weeks (`w`) and years (`y`) [#598](https://github.com/juanfont/headscale/pull/598)
 - Add support for reloading ACLs with SIGHUP [#601](https://github.com/juanfont/headscale/pull/601)
+- Add -c option to specify config file from command line [#285](https://github.com/juanfont/headscale/issues/285) [#612](https://github.com/juanfont/headscale/pull/601)
 
 ## 0.15.0 (2022-03-20)
 

cmd/headscale/cli/dump_config.go

@@ -0,0 +1,28 @@
+package cli
+
+import (
+	"fmt"
+
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+)
+
+func init() {
+	rootCmd.AddCommand(dumpConfigCmd)
+}
+
+var dumpConfigCmd = &cobra.Command{
+	Use:    "dumpConfig",
+	Short:  "dump current config to /etc/headscale/config.dump.yaml, integration test only",
+	Hidden: true,
+	Args: func(cmd *cobra.Command, args []string) error {
+		return nil
+	},
+	Run: func(cmd *cobra.Command, args []string) {
+		err := viper.WriteConfigAs("/etc/headscale/config.dump.yaml")
+		if err != nil {
+			//nolint
+			fmt.Println("Failed to dump config")
+		}
+	},
+}

cmd/headscale/cli/root.go

@@ -3,17 +3,75 @@ package cli
 import (
 	"fmt"
 	"os"
+	"runtime"
 
+	"github.com/juanfont/headscale"
+	"github.com/rs/zerolog"
+	"github.com/rs/zerolog/log"
 	"github.com/spf13/cobra"
+	"github.com/tcnksm/go-latest"
 )
 
+var cfgFile string = ""
+
 func init() {
+	cobra.OnInitialize(initConfig)
+	rootCmd.PersistentFlags().
+		StringVarP(&cfgFile, "config", "c", "", "config file (default is /etc/headscale/config.yaml)")
 	rootCmd.PersistentFlags().
 		StringP("output", "o", "", "Output format. Empty for human-readable, 'json', 'json-line' or 'yaml'")
 	rootCmd.PersistentFlags().
 		Bool("force", false, "Disable prompts and forces the execution")
 }
 
+func initConfig() {
+	if cfgFile != "" {
+		err := headscale.LoadConfig(cfgFile, true)
+		if err != nil {
+			log.Fatal().Caller().Err(err)
+		}
+	} else {
+		err := headscale.LoadConfig("", false)
+		if err != nil {
+			log.Fatal().Caller().Err(err)
+		}
+	}
+
+	cfg, err := headscale.GetHeadscaleConfig()
+	if err != nil {
+		log.Fatal().Caller().Err(err)
+	}
+
+	machineOutput := HasMachineOutputFlag()
+
+	zerolog.SetGlobalLevel(cfg.LogLevel)
+
+	// If the user has requested a "machine" readable format,
+	// then disable login so the output remains valid.
+	if machineOutput {
+		zerolog.SetGlobalLevel(zerolog.Disabled)
+	}
+
+	if !cfg.DisableUpdateCheck && !machineOutput {
+		if (runtime.GOOS == "linux" || runtime.GOOS == "darwin") &&
+			Version != "dev" {
+			githubTag := &latest.GithubTag{
+				Owner:      "juanfont",
+				Repository: "headscale",
+			}
+			res, err := latest.Check(githubTag, Version)
+			if err == nil && res.Outdated {
+				//nolint
+				fmt.Printf(
+					"An updated version of Headscale has been found (%s vs. your current %s). Check it out https://github.com/juanfont/headscale/releases\n",
+					res.Current,
+					Version,
+				)
+			}
+		}
+	}
+}
+
 var rootCmd = &cobra.Command{
 	Use:   "headscale",
 	Short: "headscale - a Tailscale control server",

cmd/headscale/headscale.go

@@ -1,17 +1,13 @@
 package main
 
 import (
-	"fmt"
 	"os"
-	"runtime"
 	"time"
 
 	"github.com/efekarakus/termcolor"
-	"github.com/juanfont/headscale"
 	"github.com/juanfont/headscale/cmd/headscale/cli"
 	"github.com/rs/zerolog"
 	"github.com/rs/zerolog/log"
-	"github.com/tcnksm/go-latest"
 )
 
 func main() {
@@ -43,39 +39,5 @@ func main() {
 		NoColor:    !colors,
 	})
 
-	cfg, err := headscale.GetHeadscaleConfig()
-	if err != nil {
-		log.Fatal().Caller().Err(err)
-	}
-
-	machineOutput := cli.HasMachineOutputFlag()
-
-	zerolog.SetGlobalLevel(cfg.LogLevel)
-
-	// If the user has requested a "machine" readable format,
-	// then disable login so the output remains valid.
-	if machineOutput {
-		zerolog.SetGlobalLevel(zerolog.Disabled)
-	}
-
-	if !cfg.DisableUpdateCheck && !machineOutput {
-		if (runtime.GOOS == "linux" || runtime.GOOS == "darwin") &&
-			cli.Version != "dev" {
-			githubTag := &latest.GithubTag{
-				Owner:      "juanfont",
-				Repository: "headscale",
-			}
-			res, err := latest.Check(githubTag, cli.Version)
-			if err == nil && res.Outdated {
-				//nolint
-				fmt.Printf(
-					"An updated version of Headscale has been found (%s vs. your current %s). Check it out https://github.com/juanfont/headscale/releases\n",
-					res.Current,
-					cli.Version,
-				)
-			}
-		}
-	}
-
 	cli.Execute()
 }

cmd/headscale/headscale_test.go

@@ -27,6 +27,51 @@ func (s *Suite) SetUpSuite(c *check.C) {
 func (s *Suite) TearDownSuite(c *check.C) {
 }
 
+func (*Suite) TestConfigFileLoading(c *check.C) {
+	tmpDir, err := ioutil.TempDir("", "headscale")
+	if err != nil {
+		c.Fatal(err)
+	}
+	defer os.RemoveAll(tmpDir)
+
+	path, err := os.Getwd()
+	if err != nil {
+		c.Fatal(err)
+	}
+
+	cfgFile := filepath.Join(tmpDir, "config.yaml")
+
+	// Symlink the example config file
+	err = os.Symlink(
+		filepath.Clean(path+"/../../config-example.yaml"),
+		cfgFile,
+	)
+	if err != nil {
+		c.Fatal(err)
+	}
+
+	// Load example config, it should load without validation errors
+	err = headscale.LoadConfig(cfgFile, true)
+	c.Assert(err, check.IsNil)
+
+	// Test that config file was interpreted correctly
+	c.Assert(viper.GetString("server_url"), check.Equals, "http://127.0.0.1:8080")
+	c.Assert(viper.GetString("listen_addr"), check.Equals, "0.0.0.0:8080")
+	c.Assert(viper.GetString("metrics_listen_addr"), check.Equals, "127.0.0.1:9090")
+	c.Assert(viper.GetString("db_type"), check.Equals, "sqlite3")
+	c.Assert(viper.GetString("db_path"), check.Equals, "/var/lib/headscale/db.sqlite")
+	c.Assert(viper.GetString("tls_letsencrypt_hostname"), check.Equals, "")
+	c.Assert(viper.GetString("tls_letsencrypt_listen"), check.Equals, ":http")
+	c.Assert(viper.GetString("tls_letsencrypt_challenge_type"), check.Equals, "HTTP-01")
+	c.Assert(viper.GetStringSlice("dns_config.nameservers")[0], check.Equals, "1.1.1.1")
+	c.Assert(
+		headscale.GetFileMode("unix_socket_permission"),
+		check.Equals,
+		fs.FileMode(0o770),
+	)
+	c.Assert(viper.GetBool("logtail.enabled"), check.Equals, false)
+}
+
 func (*Suite) TestConfigLoading(c *check.C) {
 	tmpDir, err := ioutil.TempDir("", "headscale")
 	if err != nil {
@@ -49,7 +94,7 @@ func (*Suite) TestConfigLoading(c *check.C) {
 	}
 
 	// Load example config, it should load without validation errors
-	err = headscale.LoadConfig(tmpDir)
+	err = headscale.LoadConfig(tmpDir, false)
 	c.Assert(err, check.IsNil)
 
 	// Test that config file was interpreted correctly
@@ -92,7 +137,7 @@ func (*Suite) TestDNSConfigLoading(c *check.C) {
 	}
 
 	// Load example config, it should load without validation errors
-	err = headscale.LoadConfig(tmpDir)
+	err = headscale.LoadConfig(tmpDir, false)
 	c.Assert(err, check.IsNil)
 
 	dnsConfig, baseDomain := headscale.GetDNSConfig()
@@ -125,7 +170,7 @@ func (*Suite) TestTLSConfigValidation(c *check.C) {
 	writeConfig(c, tmpDir, configYaml)
 
 	// Check configuration validation errors (1)
-	err = headscale.LoadConfig(tmpDir)
+	err = headscale.LoadConfig(tmpDir, false)
 	c.Assert(err, check.NotNil)
 	// check.Matches can not handle multiline strings
 	tmp := strings.ReplaceAll(err.Error(), "\n", "***")
@@ -150,6 +195,6 @@ func (*Suite) TestTLSConfigValidation(c *check.C) {
 		"---\nserver_url: \"http://127.0.0.1:8080\"\ntls_letsencrypt_hostname: \"example.com\"\ntls_letsencrypt_challenge_type: \"TLS-ALPN-01\"",
 	)
 	writeConfig(c, tmpDir, configYaml)
-	err = headscale.LoadConfig(tmpDir)
+	err = headscale.LoadConfig(tmpDir, false)
 	c.Assert(err, check.IsNil)
 }

config.go

@@ -114,7 +114,10 @@ type ACLConfig struct {
 	PolicyPath string
 }
 
-func LoadConfig(path string) error {
+func LoadConfig(path string, isFile bool) error {
+	if isFile {
+		viper.SetConfigFile(path)
+	} else {
 		viper.SetConfigName("config")
 		if path == "" {
 			viper.AddConfigPath("/etc/headscale/")
@@ -124,6 +127,7 @@ func LoadConfig(path string) error {
 			// For testing
 			viper.AddConfigPath(path)
 		}
+	}
 
 	viper.SetEnvPrefix("headscale")
 	viper.SetEnvKeyReplacer(strings.NewReplacer(".", "_"))
@@ -377,11 +381,6 @@ func GetDNSConfig() (*tailcfg.DNSConfig, string) {
 }
 
 func GetHeadscaleConfig() (*Config, error) {
-	err := LoadConfig("")
-	if err != nil {
-		return nil, err
-	}
-
 	dnsConfig, baseDomain := GetDNSConfig()
 	derpConfig := GetDERPConfig()
 	logConfig := GetLogTailConfig()

integration_cli_test.go

@@ -1721,3 +1721,43 @@ func (s *IntegrationCLITestSuite) TestNodeMoveCommand() {
 
 	assert.Equal(s.T(), machine.Namespace, oldNamespace)
 }
+
+func (s *IntegrationCLITestSuite) TestLoadConfigFromCommand() {
+	// TODO: make sure defaultConfig is not same as altConfig
+	defaultConfig, err := os.ReadFile("integration_test/etc/config.dump.gold.yaml")
+	assert.Nil(s.T(), err)
+	altConfig, err := os.ReadFile("integration_test/etc/alt-config.dump.gold.yaml")
+	assert.Nil(s.T(), err)
+
+	_, err = ExecuteCommand(
+		&s.headscale,
+		[]string{
+			"headscale",
+			"dumpConfig",
+		},
+		[]string{},
+	)
+	assert.Nil(s.T(), err)
+
+	defaultDumpConfig, err := os.ReadFile("integration_test/etc/config.dump.yaml")
+	assert.Nil(s.T(), err)
+
+	assert.YAMLEq(s.T(), string(defaultConfig), string(defaultDumpConfig))
+
+	_, err = ExecuteCommand(
+		&s.headscale,
+		[]string{
+			"headscale",
+			"-c",
+			"/etc/headscale/alt-config.yaml",
+			"dumpConfig",
+		},
+		[]string{},
+	)
+	assert.Nil(s.T(), err)
+
+	altDumpConfig, err := os.ReadFile("integration_test/etc/config.dump.yaml")
+	assert.Nil(s.T(), err)
+
+	assert.YAMLEq(s.T(), string(altConfig), string(altDumpConfig))
+}

integration_test/etc/alt-config.dump.gold.yaml

@@ -0,0 +1,46 @@
+acl_policy_path: ""
+cli:
+  insecure: false
+  timeout: 5s
+db_path: /tmp/integration_test_db.sqlite3
+db_type: sqlite3
+derp:
+  auto_update_enabled: false
+  server:
+    enabled: false
+    stun:
+      enabled: true
+  update_frequency: 1m
+  urls:
+    - https://controlplane.tailscale.com/derpmap/default
+dns_config:
+  base_domain: headscale.net
+  domains: []
+  magic_dns: true
+  nameservers:
+    - 1.1.1.1
+ephemeral_node_inactivity_timeout: 30m
+grpc_allow_insecure: false
+grpc_listen_addr: :50443
+ip_prefixes:
+  - fd7a:115c:a1e0::/48
+  - 100.64.0.0/10
+listen_addr: 0.0.0.0:18080
+log_level: disabled
+logtail:
+  enabled: false
+metrics_listen_addr: 127.0.0.1:19090
+oidc:
+  scope:
+    - openid
+    - profile
+    - email
+  strip_email_domain: true
+private_key_path: private.key
+server_url: http://headscale:18080
+tls_client_auth_mode: relaxed
+tls_letsencrypt_cache_dir: /var/www/.cache
+tls_letsencrypt_challenge_type: HTTP-01
+unix_socket: /var/run/headscale.sock
+unix_socket_permission: "0o770"
+

integration_test/etc/alt-config.yaml

@@ -0,0 +1,24 @@
+log_level: trace
+acl_policy_path: ""
+db_type: sqlite3
+ephemeral_node_inactivity_timeout: 30m
+ip_prefixes:
+  - fd7a:115c:a1e0::/48
+  - 100.64.0.0/10
+dns_config:
+  base_domain: headscale.net
+  magic_dns: true
+  domains: []
+  nameservers:
+    - 1.1.1.1
+db_path: /tmp/integration_test_db.sqlite3
+private_key_path: private.key
+listen_addr: 0.0.0.0:18080
+metrics_listen_addr: 127.0.0.1:19090
+server_url: http://headscale:18080
+
+derp:
+  urls:
+    - https://controlplane.tailscale.com/derpmap/default
+  auto_update_enabled: false
+  update_frequency: 1m

integration_test/etc/config.dump.gold.yaml

@@ -0,0 +1,46 @@
+acl_policy_path: ""
+cli:
+  insecure: false
+  timeout: 5s
+db_path: /tmp/integration_test_db.sqlite3
+db_type: sqlite3
+derp:
+  auto_update_enabled: false
+  server:
+    enabled: false
+    stun:
+      enabled: true
+  update_frequency: 1m
+  urls:
+    - https://controlplane.tailscale.com/derpmap/default
+dns_config:
+  base_domain: headscale.net
+  domains: []
+  magic_dns: true
+  nameservers:
+    - 1.1.1.1
+ephemeral_node_inactivity_timeout: 30m
+grpc_allow_insecure: false
+grpc_listen_addr: :50443
+ip_prefixes:
+  - fd7a:115c:a1e0::/48
+  - 100.64.0.0/10
+listen_addr: 0.0.0.0:8080
+log_level: disabled
+logtail:
+  enabled: false
+metrics_listen_addr: 127.0.0.1:9090
+oidc:
+  scope:
+    - openid
+    - profile
+    - email
+  strip_email_domain: true
+private_key_path: private.key
+server_url: http://headscale:8080
+tls_client_auth_mode: relaxed
+tls_letsencrypt_cache_dir: /var/www/.cache
+tls_letsencrypt_challenge_type: HTTP-01
+unix_socket: /var/run/headscale.sock
+unix_socket_permission: "0o770"
+