make configurable wal auto checkpoint

SQLite WAL addition disabled auto checkpoint, this
makes the WAL grow forever, not sure why I did that.

Make it configurable, set it to SQLite default.

Fixes #2204

Signed-off-by: Kristoffer Dalby <kristoffer@tailscale.com>

Dockerfile.tailscale-HEAD

@@ -28,7 +28,9 @@ ARG VERSION_GIT_HASH=""
 ENV VERSION_GIT_HASH=$VERSION_GIT_HASH
 ARG TARGETARCH
 
-RUN GOARCH=$TARGETARCH go install -ldflags="\
+ARG BUILD_TAGS=""
+
+RUN GOARCH=$TARGETARCH go install -tags="${BUILD_TAGS}" -ldflags="\
       -X tailscale.com/version.longStamp=$VERSION_LONG \
       -X tailscale.com/version.shortStamp=$VERSION_SHORT \
       -X tailscale.com/version.gitCommitStamp=$VERSION_GIT_HASH" \

config-example.yaml

@@ -168,6 +168,11 @@ database:
     # https://www.sqlite.org/wal.html
     write_ahead_log: true
 
+    # Maximum number of WAL file frames before the WAL file is automatically checkpointed.
+    # https://www.sqlite.org/c3ref/wal_autocheckpoint.html
+    # Set to 0 to disable automatic checkpointing.
+    wal_autocheckpoint: 1000
+
   # # Postgres config
   # Please note that using Postgres is highly discouraged as it is only supported for legacy reasons.
   # See database.type for more information.

docs/ref/acls.md

@@ -45,11 +45,11 @@ headscale server.
 
 ACLs have to be written in [huJSON](https://github.com/tailscale/hujson).
 
-When registering the servers we will need to add the flag
-`--advertise-tags=tag:<tag1>,tag:<tag2>`, and the user that is
-registering the server should be allowed to do it. Since anyone can add tags to
-a server they can register, the check of the tags is done on headscale server
-and only valid tags are applied. A tag is valid if the user that is
+When [registering the servers](../usage/getting-started.md#register-a-node) we
+will need to add the flag `--advertise-tags=tag:<tag1>,tag:<tag2>`, and the user
+that is registering the server should be allowed to do it. Since anyone can add
+tags to a server they can register, the check of the tags is done on headscale
+server and only valid tags are applied. A tag is valid if the user that is
 registering it is allowed to do it.
 
 To use ACLs in headscale, you must edit your `config.yaml` file. In there you will find a `policy.path` parameter. This will need to point to your ACL file. More info on how these policies are written can be found [here](https://tailscale.com/kb/1018/acls/).

docs/ref/tls.md

@@ -9,6 +9,8 @@ tls_cert_path: ""
 tls_key_path: ""
 ```
 
+The certificate should contain the full chain, else some clients, like the Tailscale Android client, will reject it.
+
 ## Let's Encrypt / ACME
 
 To get a certificate automatically via [Let's Encrypt](https://letsencrypt.org/), set `tls_letsencrypt_hostname` to the desired certificate hostname. This name must resolve to the IP address(es) headscale is reachable on (i.e., it must correspond to the `server_url` configuration parameter). The certificate and Let's Encrypt account credentials will be stored in the directory configured in `tls_letsencrypt_cache_dir`. If the path is relative, it will be interpreted as relative to the directory the configuration file was read from.

docs/usage/connect/apple.md

@@ -60,7 +60,7 @@ Install the official Tailscale tvOS client from the [App Store](https://apps.app
 
 ### Configuring the headscale URL
 
-- Go Settings (the apple tvOS settings) > Apps > Tailscale
+- Open Settings (the Apple tvOS settings) > Apps > Tailscale
 - Under `ALTERNATE COORDINATION SERVER URL`, select `URL`
 - Enter the URL of your headscale instance (e.g `https://headscale.example.com`) and press `OK`
 - Return to the tvOS Home screen

docs/usage/getting-started.md

@@ -9,6 +9,8 @@ This page helps you get started with headscale and provides a few usage examples
       installation instructions.
     * The configuration file exists and is adjusted to suit your environment, see
       [Configuration](../ref/configuration.md) for details.
+    * Headscale is reachable from the Internet. Verify this by opening client specific setup instructions in your
+      browser, e.g. https://headscale.example.com/windows
     * The Tailscale client is installed, see [Client and operating system support](../about/clients.md) for more
       information.
 

hscontrol/db/db.go

@@ -543,10 +543,10 @@ func openDB(cfg types.DatabaseConfig) (*gorm.DB, error) {
 		}
 
 		if cfg.Sqlite.WriteAheadLog {
-			if err := db.Exec(`
+			if err := db.Exec(fmt.Sprintf(`
 				PRAGMA journal_mode=WAL;
-				PRAGMA wal_autocheckpoint=0;
-				`).Error; err != nil {
+				PRAGMA wal_autocheckpoint=%d;
+				`, cfg.Sqlite.WALAutoCheckPoint)).Error; err != nil {
 				return nil, fmt.Errorf("setting WAL mode: %w", err)
 			}
 		}

hscontrol/types/config.go

@@ -104,6 +104,7 @@ type Nameservers struct {
 type SqliteConfig struct {
 	Path              string
 	WriteAheadLog     bool
+	WALAutoCheckPoint int
 }
 
 type PostgresConfig struct {
@@ -270,6 +271,7 @@ func LoadConfig(path string, isFile bool) error {
 	viper.SetDefault("database.postgres.conn_max_idle_time_secs", 3600)
 
 	viper.SetDefault("database.sqlite.write_ahead_log", true)
+	viper.SetDefault("database.sqlite.wal_autocheckpoint", 1000) // SQLite default
 
 	viper.SetDefault("oidc.scope", []string{oidc.ScopeOpenID, "profile", "email"})
 	viper.SetDefault("oidc.only_start_if_oidc_is_available", true)
@@ -543,6 +545,7 @@ func databaseConfig() DatabaseConfig {
 				viper.GetString("database.sqlite.path"),
 			),
 			WriteAheadLog:     viper.GetBool("database.sqlite.write_ahead_log"),
+			WALAutoCheckPoint: viper.GetInt("database.sqlite.wal_autocheckpoint"),
 		},
 		Postgres: PostgresConfig{
 			Host:               viper.GetString("database.postgres.host"),

integration/embedded_derp_test.go

@@ -55,7 +55,7 @@ func TestDERPServerWebsocketScenario(t *testing.T) {
 	spec := map[string]ClientsSpec{
 		"user1": {
 			Plain:         0,
-			WebsocketDERP: len(MustTestVersions),
+			WebsocketDERP: 2,
 		},
 	}
 
@@ -239,10 +239,13 @@ func (s *EmbeddedDERPServerScenario) CreateHeadscaleEnv(
 
 		if clientCount.WebsocketDERP > 0 {
 			// Containers that use DERP-over-WebSocket
+			// Note that these clients *must* be built
+			// from source, which is currently
+			// only done for HEAD.
 			err = s.CreateTailscaleIsolatedNodesInUser(
 				hash,
 				userName,
-				"all",
+				tsic.VersionHead,
 				clientCount.WebsocketDERP,
 				tsic.WithWebsocketDERP(true),
 			)

integration/tsic/tsic.go

@@ -12,6 +12,7 @@ import (
 	"net/netip"
 	"net/url"
 	"os"
+	"reflect"
 	"strconv"
 	"strings"
 	"time"
@@ -44,6 +45,11 @@ var (
 	errTailscaleCannotUpWithoutAuthkey = errors.New("cannot up without authkey")
 	errTailscaleNotConnected           = errors.New("tailscale not connected")
 	errTailscaledNotReadyForLogin      = errors.New("tailscaled not ready for login")
+	errInvalidClientConfig             = errors.New("verifiably invalid client config requested")
+)
+
+const (
+	VersionHead = "head"
 )
 
 func errTailscaleStatus(hostname string, err error) error {
@@ -74,6 +80,13 @@ type TailscaleInContainer struct {
 	withExtraHosts    []string
 	workdir           string
 	netfilter         string
+
+	// build options, solely for HEAD
+	buildConfig TailscaleInContainerBuildConfig
+}
+
+type TailscaleInContainerBuildConfig struct {
+	tags []string
 }
 
 // Option represent optional settings that can be given to a
@@ -175,6 +188,22 @@ func WithNetfilter(state string) Option {
 	}
 }
 
+// WithBuildTag adds an additional value to the `-tags=` parameter
+// of the Go compiler, allowing callers to customize the Tailscale client build.
+// This option is only meaningful when invoked on **HEAD** versions of the client.
+// Attempts to use it with any other version is a bug in the calling code.
+func WithBuildTag(tag string) Option {
+	return func(tsic *TailscaleInContainer) {
+		if tsic.version != VersionHead {
+			panic(errInvalidClientConfig)
+		}
+
+		tsic.buildConfig.tags = append(
+			tsic.buildConfig.tags, tag,
+		)
+	}
+}
+
 // New returns a new TailscaleInContainer instance.
 func New(
 	pool *dockertest.Pool,
@@ -219,6 +248,12 @@ func New(
 	}
 
 	if tsic.withWebsocketDERP {
+		if version != VersionHead {
+			return tsic, errInvalidClientConfig
+		}
+
+		WithBuildTag("ts_debug_websockets")(tsic)
+
 		tailscaleOptions.Env = append(
 			tailscaleOptions.Env,
 			fmt.Sprintf("TS_DEBUG_DERP_WS_CLIENT=%t", tsic.withWebsocketDERP),
@@ -245,14 +280,36 @@ func New(
 	}
 
 	var container *dockertest.Resource
+
+	if version != VersionHead {
+		// build options are not meaningful with pre-existing images,
+		// let's not lead anyone astray by pretending otherwise.
+		defaultBuildConfig := TailscaleInContainerBuildConfig{}
+		hasBuildConfig := !reflect.DeepEqual(defaultBuildConfig, tsic.buildConfig)
+		if hasBuildConfig {
+			return tsic, errInvalidClientConfig
+		}
+	}
+
 	switch version {
-	case "head":
+	case VersionHead:
 		buildOptions := &dockertest.BuildOptions{
 			Dockerfile: "Dockerfile.tailscale-HEAD",
 			ContextDir: dockerContextPath,
 			BuildArgs:  []docker.BuildArg{},
 		}
 
+		buildTags := strings.Join(tsic.buildConfig.tags, ",")
+		if len(buildTags) > 0 {
+			buildOptions.BuildArgs = append(
+				buildOptions.BuildArgs,
+				docker.BuildArg{
+					Name:  "BUILD_TAGS",
+					Value: buildTags,
+				},
+			)
+		}
+
 		container, err = pool.BuildAndRunWithBuildOptions(
 			buildOptions,
 			tailscaleOptions,