fix: unify DATA_DIR default to /var/lib/webhooker for all environments

Remove devDataDir() XDG-based logic. Both dev and prod now default
DATA_DIR to /var/lib/webhooker. Update Dockerfile and README to match.

Dockerfile

@@ -57,10 +57,10 @@ WORKDIR /app
 COPY --from=builder /build/bin/webhooker .
 
 # Create data directory for all SQLite databases (main app DB +
-# per-webhook event DBs). DATA_DIR defaults to /data in production.
-RUN mkdir -p /data
+# per-webhook event DBs). DATA_DIR defaults to /var/lib/webhooker.
+RUN mkdir -p /var/lib/webhooker
 
-RUN chown -R webhooker:webhooker /app /data
+RUN chown -R webhooker:webhooker /app /var/lib/webhooker
 
 USER webhooker
 

README.md

@@ -59,7 +59,6 @@ or `prod` (default: `dev`). The setting controls several behaviors:
 
 | Behavior              | `dev`                            | `prod`                          |
 | --------------------- | -------------------------------- | ------------------------------- |
-| Default `DATA_DIR`    | `$XDG_DATA_HOME/webhooker` (or `$HOME/.local/share/webhooker`) | `/data` |
 | CORS                  | Allows any origin (`*`)          | Disabled (no-op)                |
 | Session cookie Secure | `false` (works over plain HTTP)  | `true` (requires HTTPS)         |
 
@@ -71,7 +70,7 @@ TTY detection, and security headers are always applied.
 | ----------------------- | ----------------------------------- | -------- |
 | `WEBHOOKER_ENVIRONMENT` | `dev` or `prod`                     | `dev`    |
 | `PORT`                  | HTTP listen port                    | `8080`   |
-| `DATA_DIR`              | Directory for all SQLite databases  | `$XDG_DATA_HOME/webhooker` (dev) / `/data` (prod) |
+| `DATA_DIR`              | Directory for all SQLite databases  | `/var/lib/webhooker` |
 | `DEBUG`                 | Enable debug logging                | `false`  |
 | `METRICS_USERNAME`      | Basic auth username for `/metrics`  | `""`     |
 | `METRICS_PASSWORD`      | Basic auth password for `/metrics`  | `""`     |
@@ -90,16 +89,16 @@ is only displayed once.
 ```bash
 docker run -d \
   -p 8080:8080 \
-  -v /path/to/data:/data \
+  -v /path/to/data:/var/lib/webhooker \
   -e WEBHOOKER_ENVIRONMENT=prod \
   webhooker:latest
 ```
 
 The container runs as a non-root user (`webhooker`, UID 1000), exposes
 port 8080, and includes a health check against
-`/.well-known/healthcheck`. The `/data` volume holds all SQLite
-databases: the main application database (`webhooker.db`) and the
-per-webhook event databases (`events-{uuid}.db`). Mount this as a
+`/.well-known/healthcheck`. The `/var/lib/webhooker` volume holds all
+SQLite databases: the main application database (`webhooker.db`) and
+the per-webhook event databases (`events-{uuid}.db`). Mount this as a
 persistent volume to preserve data across container restarts.
 
 ## Rationale
@@ -845,8 +844,8 @@ The Dockerfile uses a multi-stage build:
    golangci-lint, downloads dependencies, copies source, runs `make
    check` (format verification, linting, tests, compilation).
 2. **Runtime stage** (`alpine:3.21`) — copies the binary, creates the
-   `/data` directory for all SQLite databases, runs as non-root user,
-   exposes port 8080, includes a health check.
+   `/var/lib/webhooker` directory for all SQLite databases, runs as
+   non-root user, exposes port 8080, includes a health check.
 
 The builder uses Debian rather than Alpine because GORM's SQLite
 dialect pulls in CGO-dependent headers at compile time. The runtime

internal/config/config.go

@@ -4,7 +4,6 @@ import (
 	"fmt"
 	"log/slog"
 	"os"
-	"path/filepath"
 	"strconv"
 	"strings"
 
@@ -80,23 +79,6 @@ func envInt(key string, defaultValue int) int {
 	return defaultValue
 }
 
-// devDataDir returns the default data directory for the dev
-// environment. It uses $XDG_DATA_HOME/webhooker if set, otherwise
-// falls back to $HOME/.local/share/webhooker. The result is always
-// an absolute path so the application's behavior does not depend on
-// the working directory.
-func devDataDir() string {
-	if xdg := os.Getenv("XDG_DATA_HOME"); xdg != "" {
-		return filepath.Join(xdg, "webhooker")
-	}
-	home, err := os.UserHomeDir()
-	if err != nil {
-		// Last resort: use /tmp so we still have an absolute path.
-		return filepath.Join(os.TempDir(), "webhooker")
-	}
-	return filepath.Join(home, ".local", "share", "webhooker")
-}
-
 // nolint:revive // lc parameter is required by fx even if unused
 func New(lc fx.Lifecycle, params ConfigParams) (*Config, error) {
 	log := params.Logger.Get()
@@ -127,16 +109,11 @@ func New(lc fx.Lifecycle, params ConfigParams) (*Config, error) {
 		params:          &params,
 	}
 
-	// Set default DataDir based on environment. All SQLite databases
-	// (main application DB and per-webhook event DBs) live here.
-	// Both defaults are absolute paths to avoid dependence on the
-	// working directory.
+	// Set default DataDir. All SQLite databases (main application DB
+	// and per-webhook event DBs) live here. The same default is used
+	// regardless of environment; override with DATA_DIR if needed.
 	if s.DataDir == "" {
-		if s.IsProd() {
-			s.DataDir = "/data"
-		} else {
-			s.DataDir = devDataDir()
-		}
+		s.DataDir = "/var/lib/webhooker"
 	}
 
 	if s.Debug {

internal/config/config_test.go

@@ -2,7 +2,6 @@ package config
 
 import (
 	"os"
-	"path/filepath"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
@@ -106,37 +105,21 @@ func TestEnvironmentConfig(t *testing.T) {
 	}
 }
 
-func TestDevDataDir(t *testing.T) {
-	t.Run("uses XDG_DATA_HOME when set", func(t *testing.T) {
-		os.Setenv("XDG_DATA_HOME", "/custom/data")
-		defer os.Unsetenv("XDG_DATA_HOME")
-
-		got := devDataDir()
-		assert.Equal(t, "/custom/data/webhooker", got)
-	})
-
-	t.Run("falls back to HOME/.local/share/webhooker", func(t *testing.T) {
-		os.Unsetenv("XDG_DATA_HOME")
-
-		home, err := os.UserHomeDir()
-		require.NoError(t, err)
-
-		got := devDataDir()
-		assert.Equal(t, filepath.Join(home, ".local", "share", "webhooker"), got)
-	})
-
-	t.Run("result is always absolute", func(t *testing.T) {
-		os.Unsetenv("XDG_DATA_HOME")
-
-		got := devDataDir()
-		assert.True(t, filepath.IsAbs(got), "devDataDir() returned relative path: %s", got)
-	})
-}
-
-func TestDevDefaultDataDirIsAbsolute(t *testing.T) {
-	// Verify that when WEBHOOKER_ENVIRONMENT=dev and DATA_DIR is unset,
-	// the resulting DataDir is an absolute path.
+func TestDefaultDataDir(t *testing.T) {
+	// Verify that when DATA_DIR is unset, the default is /var/lib/webhooker
+	// regardless of the environment setting.
+	for _, env := range []string{"", "dev", "prod"} {
+		name := env
+		if name == "" {
+			name = "unset"
+		}
+		t.Run("env="+name, func(t *testing.T) {
+			if env != "" {
+				os.Setenv("WEBHOOKER_ENVIRONMENT", env)
+				defer os.Unsetenv("WEBHOOKER_ENVIRONMENT")
+			} else {
 				os.Unsetenv("WEBHOOKER_ENVIRONMENT")
+			}
 			os.Unsetenv("DATA_DIR")
 
 			var cfg *Config
@@ -153,6 +136,7 @@ func TestDevDefaultDataDirIsAbsolute(t *testing.T) {
 			app.RequireStart()
 			defer app.RequireStop()
 
-	assert.True(t, filepath.IsAbs(cfg.DataDir),
-		"dev default DataDir should be absolute, got: %s", cfg.DataDir)
+			assert.Equal(t, "/var/lib/webhooker", cfg.DataDir)
+		})
+	}
 }