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>
tokarchuk/v1.17
zeripath 5 years ago committed by Lunny Xiao
parent 4ee97465e9
commit 884173232f
  1. 66
      contrib/environment-to-ini/README
  2. 224
      contrib/environment-to-ini/environment-to-ini.go

@ -0,0 +1,66 @@
Environment To Ini
==================
Multiple docker users have requested that the Gitea docker is changed
to permit arbitrary configuration via environment variables.
Gitea needs to use an ini file for configuration because the running
environment that starts the docker may not be the same as that used
by the hooks. An ini file also gives a good default and means that
users do not have to completely provide a full environment.
With those caveats above, this command provides a generic way of
converting suitably structured environment variables into any ini
value.
To use the command is very simple just run it and the default gitea
app.ini will be rewritten to take account of the variables provided,
however there are various options to give slightly different
behavior and these can be interrogated with the `-h` option.
The environment variables should be of the form:
GITEA__SECTION_NAME__KEY_NAME
Environment variables are usually restricted to a reduced character
set "0-9A-Z_" - in order to allow the setting of sections with
characters outside of that set, they should be escaped as following:
"_0X2E_" for ".". The entire section and key names can be escaped as
a UTF8 byte string if necessary. E.g. to configure:
"""
...
[log.console]
COLORIZE=false
STDERR=true
...
"""
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.
To plug this command in to the docker, you simply compile the provided go file using:
go build environment-to-ini.go
And copy the resulting `environment-to-ini` command to /app/gitea in the docker.
Apply the below patch to /etc/s6/gitea.setup to wire this in.
If you find this useful please comment on #7287
diff --git a/docker/root/etc/s6/gitea/setup b/docker/root/etc/s6/gitea/setup
index f87ce9115..565bfcba9 100755
--- a/docker/root/etc/s6/gitea/setup
+++ b/docker/root/etc/s6/gitea/setup
@@ -44,6 +44,8 @@ if [ ! -f ${GITEA_CUSTOM}/conf/app.ini ]; then
SECRET_KEY=${SECRET_KEY:-""} \
envsubst < /etc/templates/app.ini > ${GITEA_CUSTOM}/conf/app.ini
+ /app/gitea/environment-to-ini -c ${GITEA_CUSTOM}/conf/app.ini
+
chown ${USER}:git ${GITEA_CUSTOM}/conf/app.ini
fi

@ -0,0 +1,224 @@
// Copyright 2019 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 main
import (
"os"
"regexp"
"strconv"
"strings"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/setting"
"github.com/unknwon/com"
"github.com/urfave/cli"
ini "gopkg.in/ini.v1"
)
// EnvironmentPrefix environment variables prefixed with this represent ini values to write
const EnvironmentPrefix = "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
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"
will be mapped to the ini section "[section_name]" and the key
"KEY_NAME" with the value as provided.
Environment variables are usually restricted to a reduced character
set "0-9A-Z_" - in order to allow the setting of sections with
characters outside of that set, they should be escaped as following:
"_0X2E_" for ".". The entire section and key names can be escaped as
a UTF8 byte string if necessary. E.g. to configure:
"""
...
[log.console]
COLORIZE=false
STDERR=true
...
"""
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.`
app.Flags = []cli.Flag{
cli.StringFlag{
Name: "custom-path, C",
Value: setting.CustomPath,
Usage: "Custom path file path",
},
cli.StringFlag{
Name: "config, c",
Value: setting.CustomConf,
Usage: "Custom configuration file path",
},
cli.StringFlag{
Name: "work-path, w",
Value: setting.AppWorkPath,
Usage: "Set the gitea working path",
},
cli.StringFlag{
Name: "out, o",
Value: "",
Usage: "Destination file to write to",
},
cli.BoolFlag{
Name: "clear",
Usage: "Clears the matched variables from the environment",
},
cli.StringFlag{
Name: "prefix, p",
Value: EnvironmentPrefix,
Usage: "Environment prefix to look for - will be suffixed by __ (2 underscores)",
},
}
app.Action = runEnvironmentToIni
setting.SetCustomPathAndConf("", "", "")
err := app.Run(os.Args)
if err != nil {
log.Fatal("Failed to run app with %s: %v", os.Args, err)
}
}
func runEnvironmentToIni(c *cli.Context) error {
providedCustom := c.String("custom-path")
providedConf := c.String("config")
providedWorkPath := c.String("work-path")
setting.SetCustomPathAndConf(providedCustom, providedConf, providedWorkPath)
cfg := ini.Empty()
if com.IsFile(setting.CustomConf) {
if err := cfg.Append(setting.CustomConf); err != nil {
log.Fatal("Failed to load custom conf '%s': %v", setting.CustomConf, err)
}
} else {
log.Warn("Custom config '%s' not found, ignore this if you're running first time", setting.CustomConf)
}
cfg.NameMapper = ini.AllCapsUnderscore
prefix := c.String("prefix") + "__"
for _, kv := range os.Environ() {
idx := strings.IndexByte(kv, '=')
if idx < 0 {
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
}
section, err := cfg.GetSection(sectionName)
if err != nil {
section, err = cfg.NewSection(sectionName)
if err != nil {
log.Error("Error creating section: %s : %v", sectionName, err)
continue
}
}
key := section.Key(keyName)
if key == nil {
key, err = section.NewKey(keyName, value)
if err != nil {
log.Error("Error creating key: %s in section: %s with value: %s : %v", keyName, sectionName, value, err)
continue
}
}
key.SetValue(value)
}
destination := c.String("out")
if len(destination) == 0 {
destination = setting.CustomConf
}
err := cfg.SaveTo(destination)
if err != nil {
return err
}
if c.Bool("clear") {
for _, kv := range os.Environ() {
idx := strings.IndexByte(kv, '=')
if idx < 0 {
continue
}
eKey := kv[:idx]
if strings.HasPrefix(eKey, prefix) {
_ = os.Unsetenv(eKey)
}
}
}
return nil
}
const escapeRegexpString = "_0[xX](([0-9a-fA-F][0-9a-fA-F])+)_"
var escapeRegex = regexp.MustCompile(escapeRegexpString)
// DecodeSectionKey will decode a portable string encoded Section__Key pair
// Portable strings are considered to be of the form [A-Z0-9_]*
// We will encode a disallowed value as the UTF8 byte string preceded by _0X and
// followed by _. E.g. _0X2C_ for a '-' and _0X2E_ for '.'
// Section and Key are separated by a plain '__'.
// The entire section can be encoded as a UTF8 byte string
func DecodeSectionKey(encoded string) (string, string) {
section := ""
key := ""
inKey := false
last := 0
escapeStringIndices := escapeRegex.FindAllStringIndex(encoded, -1)
for _, unescapeIdx := range escapeStringIndices {
preceding := encoded[last:unescapeIdx[0]]
if !inKey {
if splitter := strings.Index(preceding, "__"); splitter > -1 {
section += preceding[:splitter]
inKey = true
key += preceding[splitter+2:]
} else {
section += preceding
}
} else {
key += preceding
}
toDecode := encoded[unescapeIdx[0]+3 : unescapeIdx[1]-1]
decodedBytes := make([]byte, len(toDecode)/2)
for i := 0; i < len(toDecode)/2; i++ {
// Can ignore error here as we know these should be hexadecimal from the regexp
byteInt, _ := strconv.ParseInt(toDecode[2*i:2*i+2], 16, 0)
decodedBytes[i] = byte(byteInt)
}
if inKey {
key += string(decodedBytes)
} else {
section += string(decodedBytes)
}
last = unescapeIdx[1]
}
remaining := encoded[last:]
if !inKey {
if splitter := strings.Index(remaining, "__"); splitter > -1 {
section += remaining[:splitter]
inKey = true
key += remaining[splitter+2:]
} else {
section += remaining
}
} else {
key += remaining
}
return section, key
}
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