refactor(storage): new storage file structure

- new directory structure containing manifest.json and one json file per provider, by default.
- the manifest.json file can specify a filepath for each vpn provider
- each vpn provider json data file can contain the `"preferred": true` field to enforce it is used even if outdated, unless there is a version mismatch
- `STORAGE_SERVERS_DIRECTORY_PATH` replaces `STORAGE_FILEPATH` (which is now a migration source only). It sets the directory where server manifest and per-provider JSON files are stored (default: `/gluetun/servers/`).
- First-run migration: On startup, gluetun checks for the old /gluetun/servers.json file; if found and no new manifest exists, it automatically migrates all data to /gluetun/servers/ directory structure
- Silent fallback: If legacy file isn't found, uses the new directory path normally
- Legacy cleanup: After successful migration, attempts to remove the old fat JSON file (logs warning only if removal fails, e.g., read-only bind mounts)

internal/vpn/cleanup.go

@@ -5,8 +5,8 @@ import (
 	"errors"
 	"strings"
 
+	"github.com/qdm12/gluetun-servers/pkg/constants"
 	"github.com/qdm12/gluetun/internal/configuration/settings"
-	"github.com/qdm12/gluetun/pkg/updaters/constants"
 )
 
 func (l *Loop) cleanup() {

internal/vpn/interfaces.go

@@ -5,6 +5,7 @@ import (
 	"net/netip"
 	"os/exec"
 
+	umodels "github.com/qdm12/gluetun-servers/pkg/models"
 	"github.com/qdm12/gluetun/internal/command"
 	"github.com/qdm12/gluetun/internal/configuration/settings"
 	"github.com/qdm12/gluetun/internal/models"
@@ -13,7 +14,6 @@ import (
 	portforward "github.com/qdm12/gluetun/internal/portforward"
 	"github.com/qdm12/gluetun/internal/provider"
 	"github.com/qdm12/gluetun/internal/provider/utils"
-	umodels "github.com/qdm12/gluetun/pkg/updaters/models"
 )
 
 type Firewall interface {

internal/vpn/ipv6.go

@@ -1,9 +1,9 @@
 package vpn
 
 import (
+	"github.com/qdm12/gluetun-servers/pkg/constants"
 	"github.com/qdm12/gluetun/internal/configuration/settings"
 	"github.com/qdm12/gluetun/internal/netlink"
-	"github.com/qdm12/gluetun/pkg/updaters/constants"
 )
 
 func (l *Loop) isIPv6Used(settings settings.VPN) bool {

internal/vpn/run.go

@@ -3,9 +3,9 @@ package vpn
 import (
 	"context"
 
+	uconstants "github.com/qdm12/gluetun-servers/pkg/constants"
 	"github.com/qdm12/gluetun/internal/constants"
 	"github.com/qdm12/gluetun/internal/models"
-	uconstants "github.com/qdm12/gluetun/pkg/updaters/constants"
 	"github.com/qdm12/log"
 )
 

internal/vpn/tunnelup.go

@@ -8,13 +8,13 @@ import (
 	"strings"
 	"time"
 
+	uconstants "github.com/qdm12/gluetun-servers/pkg/constants"
 	"github.com/qdm12/gluetun/internal/constants"
 	"github.com/qdm12/gluetun/internal/netlink"
 	"github.com/qdm12/gluetun/internal/pmtud"
 	pconstants "github.com/qdm12/gluetun/internal/pmtud/constants"
 	"github.com/qdm12/gluetun/internal/pmtud/tcp"
 	"github.com/qdm12/gluetun/internal/version"
-	uconstants "github.com/qdm12/gluetun/pkg/updaters/constants"
 	"github.com/qdm12/log"
 )