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forgejo/modules/setting/path.go
wxiaoguang 061b68e995
Refactor path & config system (#25330) (#25416)
Backport #25330

# The problem

There were many "path tricks":

* By default, Gitea uses its program directory as its work path
* Gitea tries to use the "work path" to guess its "custom path" and
"custom conf (app.ini)"
* Users might want to use other directories as work path
* The non-default work path should be passed to Gitea by GITEA_WORK_DIR
or "--work-path"
* But some Gitea processes are started without these values
    * The "serv" process started by OpenSSH server
    * The CLI sub-commands started by site admin
* The paths are guessed by SetCustomPathAndConf again and again
* The default values of "work path / custom path / custom conf" can be
changed when compiling

# The solution

* Use `InitWorkPathAndCommonConfig` to handle these path tricks, and use
test code to cover its behaviors.
* When Gitea's web server runs, write the WORK_PATH to "app.ini", this
value must be the most correct one, because if this value is not right,
users would find that the web UI doesn't work and then they should be
able to fix it.
* Then all other sub-commands can use the WORK_PATH in app.ini to
initialize their paths.
* By the way, when Gitea starts for git protocol, it shouldn't output
any log, otherwise the git protocol gets broken and client blocks
forever.

The "work path" priority is: WORK_PATH in app.ini > cmd arg --work-path
> env var GITEA_WORK_DIR > builtin default

The "app.ini" searching order is: cmd arg --config > cmd arg "work path
/ custom path" > env var "work path / custom path" > builtin default


## ⚠️ BREAKING

If your instance's "work path / custom path / custom conf" doesn't meet
the requirements (eg: work path must be absolute), Gitea will report a
fatal error and exit. You need to set these values according to the
error log.
2023-06-22 16:27:18 +00:00

191 lines
5.1 KiB
Go

// Copyright 2023 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package setting
import (
"errors"
"os"
"os/exec"
"path/filepath"
"strings"
"code.gitea.io/gitea/modules/log"
)
var (
// AppPath represents the path to the gitea binary
AppPath string
// AppWorkPath is the "working directory" of Gitea. It maps to the environment variable GITEA_WORK_DIR.
// If that is not set it is the default set here by the linker or failing that the directory of AppPath.
// It is used as the base path for several other paths.
AppWorkPath string
CustomPath string // Custom directory path. Env: GITEA_CUSTOM
CustomConf string
appWorkPathBuiltin string
customPathBuiltin string
customConfBuiltin string
AppWorkPathMismatch bool
)
func getAppPath() (string, error) {
var appPath string
var err error
if IsWindows && filepath.IsAbs(os.Args[0]) {
appPath = filepath.Clean(os.Args[0])
} else {
appPath, err = exec.LookPath(os.Args[0])
}
if err != nil {
if !errors.Is(err, exec.ErrDot) {
return "", err
}
appPath, err = filepath.Abs(os.Args[0])
}
if err != nil {
return "", err
}
appPath, err = filepath.Abs(appPath)
if err != nil {
return "", err
}
// Note: (legacy code) we don't use path.Dir here because it does not handle case which path starts with two "/" in Windows: "//psf/Home/..."
return strings.ReplaceAll(appPath, "\\", "/"), err
}
func init() {
var err error
if AppPath, err = getAppPath(); err != nil {
log.Fatal("Failed to get app path: %v", err)
}
if AppWorkPath == "" {
AppWorkPath = filepath.Dir(AppPath)
}
appWorkPathBuiltin = AppWorkPath
customPathBuiltin = CustomPath
customConfBuiltin = CustomConf
}
type ArgWorkPathAndCustomConf struct {
WorkPath string
CustomPath string
CustomConf string
}
type stringWithDefault struct {
Value string
IsSet bool
}
func (s *stringWithDefault) Set(v string) {
s.Value = v
s.IsSet = true
}
// InitWorkPathAndCommonConfig will set AppWorkPath, CustomPath and CustomConf, init default config provider by CustomConf and load common settings,
func InitWorkPathAndCommonConfig(getEnvFn func(name string) string, args ArgWorkPathAndCustomConf) {
tryAbsPath := func(paths ...string) string {
s := paths[len(paths)-1]
for i := len(paths) - 2; i >= 0; i-- {
if filepath.IsAbs(s) {
break
}
s = filepath.Join(paths[i], s)
}
return s
}
var err error
tmpWorkPath := stringWithDefault{Value: appWorkPathBuiltin}
if tmpWorkPath.Value == "" {
tmpWorkPath.Value = filepath.Dir(AppPath)
}
tmpCustomPath := stringWithDefault{Value: customPathBuiltin}
if tmpCustomPath.Value == "" {
tmpCustomPath.Value = "custom"
}
tmpCustomConf := stringWithDefault{Value: customConfBuiltin}
if tmpCustomConf.Value == "" {
tmpCustomConf.Value = "conf/app.ini"
}
readFromEnv := func() {
envWorkPath := getEnvFn("GITEA_WORK_DIR")
if envWorkPath != "" {
tmpWorkPath.Set(envWorkPath)
if !filepath.IsAbs(tmpWorkPath.Value) {
log.Fatal("GITEA_WORK_DIR (work path) must be absolute path")
}
}
envCustomPath := getEnvFn("GITEA_CUSTOM")
if envCustomPath != "" {
tmpCustomPath.Set(envCustomPath)
if !filepath.IsAbs(tmpCustomPath.Value) {
log.Fatal("GITEA_CUSTOM (custom path) must be absolute path")
}
}
}
readFromArgs := func() {
if args.WorkPath != "" {
tmpWorkPath.Set(args.WorkPath)
if !filepath.IsAbs(tmpWorkPath.Value) {
log.Fatal("--work-path must be absolute path")
}
}
if args.CustomPath != "" {
tmpCustomPath.Set(args.CustomPath) // if it is not abs, it will be based on work-path, it shouldn't happen
if !filepath.IsAbs(tmpCustomPath.Value) {
log.Error("--custom-path must be absolute path")
}
}
if args.CustomConf != "" {
tmpCustomConf.Set(args.CustomConf)
if !filepath.IsAbs(tmpCustomConf.Value) {
// the config path can be relative to the real current working path
if tmpCustomConf.Value, err = filepath.Abs(tmpCustomConf.Value); err != nil {
log.Fatal("Failed to get absolute path of config %q: %v", tmpCustomConf.Value, err)
}
}
}
}
readFromEnv()
readFromArgs()
if !tmpCustomConf.IsSet {
tmpCustomConf.Set(tryAbsPath(tmpWorkPath.Value, tmpCustomPath.Value, tmpCustomConf.Value))
}
// only read the config but do not load/init anything more, because the AppWorkPath and CustomPath are not ready
InitCfgProvider(tmpCustomConf.Value)
configWorkPath := ConfigSectionKeyString(CfgProvider.Section(""), "WORK_PATH")
if configWorkPath != "" {
if !filepath.IsAbs(configWorkPath) {
log.Fatal("WORK_PATH in %q must be absolute path", configWorkPath)
}
configWorkPath = filepath.Clean(configWorkPath)
if tmpWorkPath.Value != "" && (getEnvFn("GITEA_WORK_DIR") != "" || args.WorkPath != "") {
fi1, err1 := os.Stat(tmpWorkPath.Value)
fi2, err2 := os.Stat(configWorkPath)
if err1 != nil || err2 != nil || !os.SameFile(fi1, fi2) {
AppWorkPathMismatch = true
}
}
tmpWorkPath.Set(configWorkPath)
}
tmpCustomPath.Set(tryAbsPath(tmpWorkPath.Value, tmpCustomPath.Value))
AppWorkPath = tmpWorkPath.Value
CustomPath = tmpCustomPath.Value
CustomConf = tmpCustomConf.Value
LoadCommonSettings()
}