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Add contrib/environment-to-ini (#9519)
* Add contrib/environment-to-ini This contrib command provides a mechanism to allow arbitrary setting of ini values using the environment variable in a more docker standard fashion. Environment variable keys should be structured as: "GITEA__SECTION_NAME__KEY_NAME" Use of the command is explained in the README. Partial fix for #350 Closes #7287 * Update contrib/environment-to-ini/environment-to-ini.go Co-Authored-By: 6543 <6543@obermui.de> Co-authored-by: Antoine GIRARD <sapk@users.noreply.github.com> Co-authored-by: 6543 <6543@obermui.de>
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Lunny Xiao
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66
contrib/environment-to-ini/README
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66
contrib/environment-to-ini/README
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@ -0,0 +1,66 @@
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Environment To Ini
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==================
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Multiple docker users have requested that the Gitea docker is changed
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to permit arbitrary configuration via environment variables.
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Gitea needs to use an ini file for configuration because the running
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environment that starts the docker may not be the same as that used
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by the hooks. An ini file also gives a good default and means that
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users do not have to completely provide a full environment.
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With those caveats above, this command provides a generic way of
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converting suitably structured environment variables into any ini
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value.
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To use the command is very simple just run it and the default gitea
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app.ini will be rewritten to take account of the variables provided,
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however there are various options to give slightly different
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behavior and these can be interrogated with the `-h` option.
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The environment variables should be of the form:
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GITEA__SECTION_NAME__KEY_NAME
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Environment variables are usually restricted to a reduced character
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set "0-9A-Z_" - in order to allow the setting of sections with
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characters outside of that set, they should be escaped as following:
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"_0X2E_" for ".". The entire section and key names can be escaped as
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a UTF8 byte string if necessary. E.g. to configure:
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"""
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...
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[log.console]
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COLORIZE=false
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STDERR=true
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...
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"""
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You would set the environment variables: "GITEA__LOG_0x2E_CONSOLE__COLORIZE=false"
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and "GITEA__LOG_0x2E_CONSOLE__STDERR=false". Other examples can be found
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on the configuration cheat sheet.
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To plug this command in to the docker, you simply compile the provided go file using:
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go build environment-to-ini.go
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And copy the resulting `environment-to-ini` command to /app/gitea in the docker.
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Apply the below patch to /etc/s6/gitea.setup to wire this in.
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If you find this useful please comment on #7287
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diff --git a/docker/root/etc/s6/gitea/setup b/docker/root/etc/s6/gitea/setup
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index f87ce9115..565bfcba9 100755
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--- a/docker/root/etc/s6/gitea/setup
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+++ b/docker/root/etc/s6/gitea/setup
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@@ -44,6 +44,8 @@ if [ ! -f ${GITEA_CUSTOM}/conf/app.ini ]; then
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SECRET_KEY=${SECRET_KEY:-""} \
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envsubst < /etc/templates/app.ini > ${GITEA_CUSTOM}/conf/app.ini
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+ /app/gitea/environment-to-ini -c ${GITEA_CUSTOM}/conf/app.ini
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+
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chown ${USER}:git ${GITEA_CUSTOM}/conf/app.ini
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fi
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224
contrib/environment-to-ini/environment-to-ini.go
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224
contrib/environment-to-ini/environment-to-ini.go
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// Copyright 2019 The Gitea Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package main
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import (
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"os"
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"regexp"
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"strconv"
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"strings"
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"code.gitea.io/gitea/modules/log"
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"code.gitea.io/gitea/modules/setting"
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"github.com/unknwon/com"
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"github.com/urfave/cli"
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ini "gopkg.in/ini.v1"
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)
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// EnvironmentPrefix environment variables prefixed with this represent ini values to write
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const EnvironmentPrefix = "GITEA"
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func main() {
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app := cli.NewApp()
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app.Name = "environment-to-ini"
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app.Usage = "Use provided environment to update configuration ini"
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app.Description = `As a helper to allow docker users to update the gitea configuration
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through the environment, this command allows environment variables to
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be mapped to values in the ini.
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Environment variables of the form "GITEA__SECTION_NAME__KEY_NAME"
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will be mapped to the ini section "[section_name]" and the key
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"KEY_NAME" with the value as provided.
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Environment variables are usually restricted to a reduced character
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set "0-9A-Z_" - in order to allow the setting of sections with
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characters outside of that set, they should be escaped as following:
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"_0X2E_" for ".". The entire section and key names can be escaped as
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a UTF8 byte string if necessary. E.g. to configure:
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"""
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...
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[log.console]
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COLORIZE=false
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STDERR=true
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...
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"""
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You would set the environment variables: "GITEA__LOG_0x2E_CONSOLE__COLORIZE=false"
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and "GITEA__LOG_0x2E_CONSOLE__STDERR=false". Other examples can be found
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on the configuration cheat sheet.`
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app.Flags = []cli.Flag{
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cli.StringFlag{
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Name: "custom-path, C",
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Value: setting.CustomPath,
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Usage: "Custom path file path",
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},
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cli.StringFlag{
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Name: "config, c",
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Value: setting.CustomConf,
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Usage: "Custom configuration file path",
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},
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cli.StringFlag{
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Name: "work-path, w",
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Value: setting.AppWorkPath,
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Usage: "Set the gitea working path",
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},
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cli.StringFlag{
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Name: "out, o",
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Value: "",
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Usage: "Destination file to write to",
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},
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cli.BoolFlag{
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Name: "clear",
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Usage: "Clears the matched variables from the environment",
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},
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cli.StringFlag{
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Name: "prefix, p",
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Value: EnvironmentPrefix,
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Usage: "Environment prefix to look for - will be suffixed by __ (2 underscores)",
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},
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}
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app.Action = runEnvironmentToIni
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setting.SetCustomPathAndConf("", "", "")
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err := app.Run(os.Args)
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if err != nil {
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log.Fatal("Failed to run app with %s: %v", os.Args, err)
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}
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}
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func runEnvironmentToIni(c *cli.Context) error {
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providedCustom := c.String("custom-path")
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providedConf := c.String("config")
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providedWorkPath := c.String("work-path")
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setting.SetCustomPathAndConf(providedCustom, providedConf, providedWorkPath)
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cfg := ini.Empty()
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if com.IsFile(setting.CustomConf) {
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if err := cfg.Append(setting.CustomConf); err != nil {
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log.Fatal("Failed to load custom conf '%s': %v", setting.CustomConf, err)
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}
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} else {
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log.Warn("Custom config '%s' not found, ignore this if you're running first time", setting.CustomConf)
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}
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cfg.NameMapper = ini.AllCapsUnderscore
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prefix := c.String("prefix") + "__"
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for _, kv := range os.Environ() {
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idx := strings.IndexByte(kv, '=')
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if idx < 0 {
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continue
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}
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eKey := kv[:idx]
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value := kv[idx+1:]
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if !strings.HasPrefix(eKey, prefix) {
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continue
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}
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eKey = eKey[len(prefix):]
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sectionName, keyName := DecodeSectionKey(eKey)
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if len(keyName) == 0 {
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continue
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}
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section, err := cfg.GetSection(sectionName)
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if err != nil {
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section, err = cfg.NewSection(sectionName)
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if err != nil {
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log.Error("Error creating section: %s : %v", sectionName, err)
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continue
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}
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}
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key := section.Key(keyName)
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if key == nil {
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key, err = section.NewKey(keyName, value)
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if err != nil {
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log.Error("Error creating key: %s in section: %s with value: %s : %v", keyName, sectionName, value, err)
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continue
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}
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}
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key.SetValue(value)
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}
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destination := c.String("out")
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if len(destination) == 0 {
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destination = setting.CustomConf
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}
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err := cfg.SaveTo(destination)
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if err != nil {
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return err
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}
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if c.Bool("clear") {
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for _, kv := range os.Environ() {
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idx := strings.IndexByte(kv, '=')
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if idx < 0 {
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continue
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}
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eKey := kv[:idx]
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if strings.HasPrefix(eKey, prefix) {
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_ = os.Unsetenv(eKey)
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}
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}
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}
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return nil
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}
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const escapeRegexpString = "_0[xX](([0-9a-fA-F][0-9a-fA-F])+)_"
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var escapeRegex = regexp.MustCompile(escapeRegexpString)
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// DecodeSectionKey will decode a portable string encoded Section__Key pair
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// Portable strings are considered to be of the form [A-Z0-9_]*
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// We will encode a disallowed value as the UTF8 byte string preceded by _0X and
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// followed by _. E.g. _0X2C_ for a '-' and _0X2E_ for '.'
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// Section and Key are separated by a plain '__'.
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// The entire section can be encoded as a UTF8 byte string
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func DecodeSectionKey(encoded string) (string, string) {
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section := ""
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key := ""
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inKey := false
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last := 0
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escapeStringIndices := escapeRegex.FindAllStringIndex(encoded, -1)
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for _, unescapeIdx := range escapeStringIndices {
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preceding := encoded[last:unescapeIdx[0]]
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if !inKey {
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if splitter := strings.Index(preceding, "__"); splitter > -1 {
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section += preceding[:splitter]
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inKey = true
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key += preceding[splitter+2:]
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} else {
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section += preceding
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}
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} else {
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key += preceding
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}
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toDecode := encoded[unescapeIdx[0]+3 : unescapeIdx[1]-1]
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decodedBytes := make([]byte, len(toDecode)/2)
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for i := 0; i < len(toDecode)/2; i++ {
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// Can ignore error here as we know these should be hexadecimal from the regexp
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byteInt, _ := strconv.ParseInt(toDecode[2*i:2*i+2], 16, 0)
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decodedBytes[i] = byte(byteInt)
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}
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if inKey {
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key += string(decodedBytes)
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} else {
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section += string(decodedBytes)
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}
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last = unescapeIdx[1]
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}
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remaining := encoded[last:]
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if !inKey {
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if splitter := strings.Index(remaining, "__"); splitter > -1 {
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section += remaining[:splitter]
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inKey = true
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key += remaining[splitter+2:]
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} else {
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section += remaining
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}
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} else {
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key += remaining
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}
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return section, key
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}
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