Make mirror feature more configurable (#16957)

Rename`[repository]` `DISABLE_MIRRORS` to `[mirror]` `DISABLE_NEW_PULL`  and add `ENABLED` and `DISABLE_NEW_PUSH` with the below meanings:

- `ENABLED`: **true**: Enables the mirror functionality. Set to **false** to disable all mirrors.
- `DISABLE_NEW_PULL`: **false**: Disable the creation of **new** mirrors. Pre-existing mirrors remain valid.
- `DISABLE_NEW_PUSH`: **false**: Disable the creation of **new** push mirrors. Pre-existing mirrors remain valid.


Co-authored-by: zeripath <art27@cantab.net>
Co-authored-by: delvh <dev.lh@web.de>

modules/setting/mirror.go

@@ -0,0 +1,59 @@
+// Copyright 2021 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package setting
+
+import (
+	"time"
+
+	"code.gitea.io/gitea/modules/log"
+)
+
+var (
+	// Mirror settings
+	Mirror = struct {
+		Enabled         bool
+		DisableNewPull  bool
+		DisableNewPush  bool
+		DefaultInterval time.Duration
+		MinInterval     time.Duration
+	}{
+		Enabled:         true,
+		DisableNewPull:  false,
+		DisableNewPush:  false,
+		MinInterval:     10 * time.Minute,
+		DefaultInterval: 8 * time.Hour,
+	}
+)
+
+func newMirror() {
+	// Handle old configuration through `[repository]` `DISABLE_MIRRORS`
+	// - please note this was badly named and only disabled the creation of new pull mirrors
+	if Cfg.Section("repository").Key("DISABLE_MIRRORS").MustBool(false) {
+		log.Warn("Deprecated DISABLE_MIRRORS config is used, please change your config and use the options within the [mirror] section")
+		// TODO: enable on v1.17.0: log.Error("Deprecated fallback used, will be removed in v1.18.0")
+		Mirror.DisableNewPull = true
+	}
+	if err := Cfg.Section("mirror").MapTo(&Mirror); err != nil {
+		log.Fatal("Failed to map Mirror settings: %v", err)
+	}
+
+	if !Mirror.Enabled {
+		Mirror.DisableNewPull = true
+		Mirror.DisableNewPush = true
+	}
+
+	if Mirror.MinInterval.Minutes() < 1 {
+		log.Warn("Mirror.MinInterval is too low, set to 1 minute")
+		Mirror.MinInterval = 1 * time.Minute
+	}
+	if Mirror.DefaultInterval < Mirror.MinInterval {
+		if time.Hour*8 < Mirror.MinInterval {
+			Mirror.DefaultInterval = Mirror.MinInterval
+		} else {
+			Mirror.DefaultInterval = time.Hour * 8
+		}
+		log.Warn("Mirror.DefaultInterval is less than Mirror.MinInterval, set to %s", Mirror.DefaultInterval.String())
+	}
+}

modules/setting/repository.go

@@ -41,7 +41,6 @@ var (
 		DisabledRepoUnits                       []string
 		DefaultRepoUnits                        []string
 		PrefixArchiveFiles                      bool
-		DisableMirrors                          bool
 		DisableMigrations                       bool
 		DisableStars                            bool `ini:"DISABLE_STARS"`
 		DefaultBranch                           string
@@ -155,7 +154,6 @@ var (
 		DisabledRepoUnits:                       []string{},
 		DefaultRepoUnits:                        []string{},
 		PrefixArchiveFiles:                      true,
-		DisableMirrors:                          false,
 		DisableMigrations:                       false,
 		DisableStars:                            false,
 		DefaultBranch:                           "master",

modules/setting/setting.go

@@ -348,12 +348,6 @@ var (
 
 	ManifestData string
 
-	// Mirror settings
-	Mirror struct {
-		DefaultInterval time.Duration
-		MinInterval     time.Duration
-	}
-
 	// API settings
 	API = struct {
 		EnableSwagger          bool
@@ -938,17 +932,7 @@ func NewContext() {
 
 	newGit()
 
-	sec = Cfg.Section("mirror")
-	Mirror.MinInterval = sec.Key("MIN_INTERVAL").MustDuration(10 * time.Minute)
-	Mirror.DefaultInterval = sec.Key("DEFAULT_INTERVAL").MustDuration(8 * time.Hour)
-	if Mirror.MinInterval.Minutes() < 1 {
-		log.Warn("Mirror.MinInterval is too low")
-		Mirror.MinInterval = 1 * time.Minute
-	}
-	if Mirror.DefaultInterval < Mirror.MinInterval {
-		log.Warn("Mirror.DefaultInterval is less than Mirror.MinInterval")
-		Mirror.DefaultInterval = time.Hour * 8
-	}
+	newMirror()
 
 	Langs = Cfg.Section("i18n").Key("LANGS").Strings(",")
 	if len(Langs) == 0 {