[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 6cd61e2ab701ae9236ff9a68520ee1e2d03e6193)
(cherry picked from commit 62cae8cc6a6ddc9e5bb066c81834b75cef3be29f)
(cherry picked from commit aee1afc5097531b2740b2aa8ef4aef745e7a1be0)
(cherry picked from commit 6ba563cd9b09d012a804f3f438c5ae4e38ca6ced)
(cherry picked from commit d887235e081844e80c74979938c669fd68ed04a2)
(cherry picked from commit c9a0a44e28237a0b1ff3c65abc5b078383cdf4ac)
(cherry picked from commit 2cae2fca8e9889278aaf98a710cf062a596c9984)
(cherry picked from commit c457919a2aa2af821741efc3298a9a1d8d05688e)
(cherry picked from commit 57709acf6514925f68645b4c7741bd74eca75240)
(cherry picked from commit 5bad53d6fcc174330791bd19e9e1d12827efd8fe)

.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, "")
+}