[BRANDING] parse FORGEJO__* in the container environment

Add the FORGEJO__ prefix as equivalent to GITEA__ when interpreted by
environment-to-ini. It is used when running the Forgejo container like
so:

  docker run --name forgejo -e FORGEJO__security__INSTALL_LOCK=true \
             -d codeberg.org/forgejo/forgejo:1.18

Signed-off-by: Earl Warren <contact@earl-warren.org>
(cherry picked from commit 6cd61e2ab7)
(cherry picked from commit 62cae8cc6a)
(cherry picked from commit aee1afc509)
(cherry picked from commit 6ba563cd9b)
(cherry picked from commit 6429b20f4a)
(cherry picked from commit dd545aa077)

.woodpecker/testing-amd64.yml

@@ -75,6 +75,14 @@ pipeline:
     commands:
     - ./build/test-env-prepare.sh
 
+  environment-to-ini:
+    image: *golang_image
+    environment:
+      GOPROXY_OVERRIDE: *goproxy_override
+    commands:
+      - *goproxy_setup
+      - go test contrib/environment-to-ini/environment-to-ini.go contrib/environment-to-ini/environment-to-ini_test.go
+
   build:
     image: *test_image
     environment:

contrib/environment-to-ini/environment-to-ini.go

@@ -1,3 +1,4 @@
+// Copyright 2023 The Forgejo Authors. All rights reserved.
 // Copyright 2019 The Gitea Authors. All rights reserved.
 // SPDX-License-Identifier: MIT
 
@@ -18,17 +19,17 @@ import (
 )
 
 // EnvironmentPrefix environment variables prefixed with this represent ini values to write
-const EnvironmentPrefix = "GITEA"
+const prefixRegexpString = "^(FORGEJO|GITEA)"
 
 func main() {
 	app := cli.NewApp()
 	app.Name = "environment-to-ini"
 	app.Usage = "Use provided environment to update configuration ini"
-	app.Description = `As a helper to allow docker users to update the gitea configuration
+	app.Description = `As a helper to allow docker users to update the forgejo configuration
 	through the environment, this command allows environment variables to
 	be mapped to values in the ini.
 
-	Environment variables of the form "GITEA__SECTION_NAME__KEY_NAME"
+	Environment variables of the form "FORGEJO__SECTION_NAME__KEY_NAME"
 	will be mapped to the ini section "[section_name]" and the key
 	"KEY_NAME" with the value as provided.
 
@@ -46,9 +47,8 @@ func main() {
 		...
 		"""
 
-	You would set the environment variables: "GITEA__LOG_0x2E_CONSOLE__COLORIZE=false"
-	and "GITEA__LOG_0x2E_CONSOLE__STDERR=false". Other examples can be found
-	on the configuration cheat sheet.`
+	You would set the environment variables: "FORGEJO__LOG_0x2E_CONSOLE__COLORIZE=false"
+	and "FORGEJO__LOG_0x2E_CONSOLE__STDERR=false".`
 	app.Flags = []cli.Flag{
 		cli.StringFlag{
 			Name:  "custom-path, C",
@@ -76,7 +76,7 @@ func main() {
 		},
 		cli.StringFlag{
 			Name:  "prefix, p",
-			Value: EnvironmentPrefix,
+			Value: prefixRegexpString,
 			Usage: "Environment prefix to look for - will be suffixed by __ (2 underscores)",
 		},
 	}
@@ -89,6 +89,19 @@ func main() {
 	}
 }
 
+func splitEnvironmentVariable(prefixRegexp *regexp.Regexp, kv string) (string, string) {
+	idx := strings.IndexByte(kv, '=')
+	if idx < 0 {
+		return "", ""
+	}
+	k := kv[:idx]
+	loc := prefixRegexp.FindStringIndex(k)
+	if loc == nil {
+		return "", ""
+	}
+	return k[loc[1]:], kv[idx+1:]
+}
+
 func runEnvironmentToIni(c *cli.Context) error {
 	providedCustom := c.String("custom-path")
 	providedConf := c.String("config")
@@ -111,19 +124,13 @@ func runEnvironmentToIni(c *cli.Context) error {
 
 	changed := false
 
-	prefix := c.String("prefix") + "__"
+	prefixRegexp := regexp.MustCompile(c.String("prefix") + "__")
 
 	for _, kv := range os.Environ() {
-		idx := strings.IndexByte(kv, '=')
-		if idx < 0 {
+		eKey, value := splitEnvironmentVariable(prefixRegexp, kv)
+		if eKey == "" {
 			continue
 		}
-		eKey := kv[:idx]
-		value := kv[idx+1:]
-		if !strings.HasPrefix(eKey, prefix) {
-			continue
-		}
-		eKey = eKey[len(prefix):]
 		sectionName, keyName := DecodeSectionKey(eKey)
 		if len(keyName) == 0 {
 			continue
@@ -163,14 +170,11 @@ func runEnvironmentToIni(c *cli.Context) error {
 	}
 	if c.Bool("clear") {
 		for _, kv := range os.Environ() {
-			idx := strings.IndexByte(kv, '=')
-			if idx < 0 {
+			eKey, _ := splitEnvironmentVariable(prefixRegexp, kv)
+			if eKey == "" {
 				continue
 			}
-			eKey := kv[:idx]
-			if strings.HasPrefix(eKey, prefix) {
-				_ = os.Unsetenv(eKey)
-			}
+			_ = os.Unsetenv(eKey)
 		}
 	}
 	return nil

contrib/environment-to-ini/environment-to-ini_test.go

@@ -0,0 +1,21 @@
+// Copyright 2023 The Forgejo Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package main
+
+import (
+	"regexp"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func Test_splitEnvironmentVariable(t *testing.T) {
+	prefixRegexp := regexp.MustCompile(prefixRegexpString + "__")
+	k, v := splitEnvironmentVariable(prefixRegexp, "FORGEJO__KEY=VALUE")
+	assert.Equal(t, k, "KEY")
+	assert.Equal(t, v, "VALUE")
+	k, v = splitEnvironmentVariable(prefixRegexp, "nothing=interesting")
+	assert.Equal(t, k, "")
+	assert.Equal(t, v, "")
+}