syncthing/lib/locations/locations.go

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// Copyright (C) 2019 The Syncthing Authors.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at https://mozilla.org/MPL/2.0/.
package locations
import (
"fmt"
"os"
"path/filepath"
"runtime"
"strings"
"time"
"github.com/syncthing/syncthing/lib/build"
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"github.com/syncthing/syncthing/lib/fs"
)
type LocationEnum string
// Use strings as keys to make printout and serialization of the locations map
// more meaningful.
const (
ConfigFile LocationEnum = "config"
CertFile LocationEnum = "certFile"
KeyFile LocationEnum = "keyFile"
HTTPSCertFile LocationEnum = "httpsCertFile"
HTTPSKeyFile LocationEnum = "httpsKeyFile"
Database LocationEnum = "database"
LogFile LocationEnum = "logFile"
CsrfTokens LocationEnum = "csrfTokens"
PanicLog LocationEnum = "panicLog"
AuditLog LocationEnum = "auditLog"
GUIAssets LocationEnum = "GUIAssets"
DefFolder LocationEnum = "defFolder"
FailuresFile LocationEnum = "FailuresFile"
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)
type BaseDirEnum string
const (
// Overridden by --home flag
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ConfigBaseDir BaseDirEnum = "config"
DataBaseDir BaseDirEnum = "data"
// User's home directory, *not* --home flag
UserHomeBaseDir BaseDirEnum = "userHome"
LevelDBDir = "index-v0.14.0.db"
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)
// Platform dependent directories
var baseDirs = make(map[BaseDirEnum]string, 3)
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func init() {
userHome := userHomeDir()
config := defaultConfigDir(userHome)
baseDirs[UserHomeBaseDir] = userHome
baseDirs[ConfigBaseDir] = config
baseDirs[DataBaseDir] = defaultDataDir(userHome, config)
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err := expandLocations()
if err != nil {
fmt.Println(err)
panic("Failed to expand locations at init time")
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}
}
func SetBaseDir(baseDirName BaseDirEnum, path string) error {
if !filepath.IsAbs(path) {
var err error
path, err = filepath.Abs(path)
if err != nil {
return err
}
}
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_, ok := baseDirs[baseDirName]
if !ok {
return fmt.Errorf("unknown base dir: %s", baseDirName)
}
baseDirs[baseDirName] = filepath.Clean(path)
return expandLocations()
}
func Get(location LocationEnum) string {
return locations[location]
}
func GetBaseDir(baseDir BaseDirEnum) string {
return baseDirs[baseDir]
}
// Use the variables from baseDirs here
var locationTemplates = map[LocationEnum]string{
ConfigFile: "${config}/config.xml",
CertFile: "${config}/cert.pem",
KeyFile: "${config}/key.pem",
HTTPSCertFile: "${config}/https-cert.pem",
HTTPSKeyFile: "${config}/https-key.pem",
Database: "${data}/" + LevelDBDir,
LogFile: "${data}/syncthing.log", // --logfile on Windows
CsrfTokens: "${data}/csrftokens.txt",
PanicLog: "${data}/panic-${timestamp}.log",
AuditLog: "${data}/audit-${timestamp}.log",
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GUIAssets: "${config}/gui",
DefFolder: "${userHome}/Sync",
FailuresFile: "${data}/failures-unreported.txt",
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}
var locations = make(map[LocationEnum]string)
// expandLocations replaces the variables in the locations map with actual
// directory locations.
func expandLocations() error {
newLocations := make(map[LocationEnum]string)
for key, dir := range locationTemplates {
for varName, value := range baseDirs {
dir = strings.ReplaceAll(dir, "${"+string(varName)+"}", value)
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}
var err error
dir, err = fs.ExpandTilde(dir)
if err != nil {
return err
}
newLocations[key] = filepath.Clean(dir)
}
locations = newLocations
return nil
}
// defaultConfigDir returns the default configuration directory, as figured
// out by various the environment variables present on each platform, or dies
// trying.
func defaultConfigDir(userHome string) string {
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switch runtime.GOOS {
case build.Windows:
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if p := os.Getenv("LocalAppData"); p != "" {
return filepath.Join(p, "Syncthing")
}
return filepath.Join(os.Getenv("AppData"), "Syncthing")
case build.Darwin:
return filepath.Join(userHome, "Library/Application Support/Syncthing")
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default:
if xdgCfg := os.Getenv("XDG_CONFIG_HOME"); xdgCfg != "" {
return filepath.Join(xdgCfg, "syncthing")
}
return filepath.Join(userHome, ".config/syncthing")
}
}
// defaultDataDir returns the default data directory, which usually is the
// config directory but might be something else.
func defaultDataDir(userHome, config string) string {
if build.IsWindows || build.IsDarwin {
return config
}
// If a database exists at the "normal" location, use that anyway.
if _, err := os.Lstat(filepath.Join(config, LevelDBDir)); err == nil {
return config
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}
// Always use this env var, as it's explicitly set by the user
if xdgHome := os.Getenv("XDG_DATA_HOME"); xdgHome != "" {
return filepath.Join(xdgHome, "syncthing")
}
// Only use the XDG default, if a syncthing specific dir already
// exists. Existence of ~/.local/share is not deemed enough, as
// it may also exist erroneously on non-XDG systems.
xdgDefault := filepath.Join(userHome, ".local/share/syncthing")
if _, err := os.Lstat(xdgDefault); err == nil {
return xdgDefault
}
// FYI: XDG_DATA_DIRS is not relevant, as it is for system-wide
// data dirs, not user specific ones.
return config
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}
// userHomeDir returns the user's home directory, or dies trying.
func userHomeDir() string {
userHome, err := fs.ExpandTilde("~")
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if err != nil {
fmt.Println(err)
panic("Failed to get user home dir")
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}
return userHome
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}
func GetTimestamped(key LocationEnum) string {
// We take the roundtrip via "${timestamp}" instead of passing the path
// directly through time.Format() to avoid issues when the path we are
// expanding contains numbers; otherwise for example
// /home/user2006/.../panic-20060102-150405.log would get both instances of
// 2006 replaced by 2015...
tpl := locations[key]
now := time.Now().Format("20060102-150405")
return strings.ReplaceAll(tpl, "${timestamp}", now)
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}