Add ability to connect to PostgreSQL via unix socket

CHANGELOG.md

@@ -5,6 +5,7 @@
 - Updated dependencies (including the library that lacked armhf support) [#722](https://github.com/juanfont/headscale/pull/722)
 - Fix missing group expansion in function `excludeCorretlyTaggedNodes` [#563](https://github.com/juanfont/headscale/issues/563)
 - Improve registration protocol implementation and switch to NodeKey as main identifier [#725](https://github.com/juanfont/headscale/pull/725)
+- Add ability to connect to PostgreSQL via unix socket [#734](https://github.com/juanfont/headscale/pull/734)
 
 ## 0.16.0 (2022-07-25)
 

app.go

@@ -129,13 +129,19 @@ func NewHeadscale(cfg *Config) (*Headscale, error) {
 	switch cfg.DBtype {
 	case Postgres:
 		dbString = fmt.Sprintf(
-			"host=%s port=%d dbname=%s user=%s password=%s sslmode=disable",
+			"host=%s dbname=%s user=%s sslmode=disable",
 			cfg.DBhost,
-			cfg.DBport,
 			cfg.DBname,
 			cfg.DBuser,
-			cfg.DBpass,
 		)
+
+		if cfg.DBport != 0 {
+			dbString += fmt.Sprintf(" port=%d", cfg.DBport)
+		}
+
+		if cfg.DBpass != "" {
+			dbString += fmt.Sprintf(" password=%s", cfg.DBpass)
+		}
 	case Sqlite:
 		dbString = cfg.DBpath
 	default:

config-example.yaml

@@ -116,6 +116,9 @@ db_path: /var/lib/headscale/db.sqlite
 # # Postgres config
 # db_type: postgres
 # db_host: localhost
+
+# This should be set when using a TCP connection, set it to '0' or keep it unset if
+# connecting through a unix socket.
 # db_port: 5432
 # db_name: headscale
 # db_user: foo