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config: retry saving the config after failure - fixes #2060

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This commit is contained in:
Mateusz 2018-02-19 18:59:27 +01:00 committed by Nick Craig-Wood
parent c929de9dc4
commit afc963ed92
1 changed files with 30 additions and 12 deletions
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42
fs/config/config.go
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@ -12,6 +12,7 @@ import (
"io"
"io/ioutil"
"log"
mathrand "math/rand"
"os"
"os/user"
"path/filepath"
@ -20,6 +21,7 @@ import (
"sort"
"strconv"
"strings"
"time"
"unicode/utf8"
"github.com/Unknwon/goconfig"
@ -348,14 +350,13 @@ func changeConfigPassword() {
}
}
// SaveConfig saves configuration file.
// saveConfig saves configuration file.
// if configKey has been set, the file will be encrypted.
func SaveConfig() {
func saveConfig() error {
dir, name := filepath.Split(ConfigPath)
f, err := ioutil.TempFile(dir, name)
if err != nil {
log.Fatalf("Failed to create temp file for new config: %v", err)
return
return errors.Errorf("Failed to create temp file for new config: %v", err)
}
defer func() {
if err := os.Remove(f.Name()); err != nil && !os.IsNotExist(err) {
@ -366,12 +367,12 @@ func SaveConfig() {
var buf bytes.Buffer
err = goconfig.SaveConfigData(configData, &buf)
if err != nil {
log.Fatalf("Failed to save config file: %v", err)
return errors.Errorf("Failed to save config file: %v", err)
}
if len(configKey) == 0 {
if _, err := buf.WriteTo(f); err != nil {
log.Fatalf("Failed to write temp config file: %v", err)
return errors.Errorf("Failed to write temp config file: %v", err)
}
} else {
fmt.Fprintln(f, "# Encrypted rclone configuration File")
@ -382,12 +383,12 @@ func SaveConfig() {
var nonce [24]byte
n, _ := rand.Read(nonce[:])
if n != 24 {
log.Fatalf("nonce short read: %d", n)
return errors.Errorf("nonce short read: %d", n)
}
enc := base64.NewEncoder(base64.StdEncoding, f)
_, err = enc.Write(nonce[:])
if err != nil {
log.Fatalf("Failed to write temp config file: %v", err)
return errors.Errorf("Failed to write temp config file: %v", err)
}
var key [32]byte
@ -396,14 +397,14 @@ func SaveConfig() {
b := secretbox.Seal(nil, buf.Bytes(), &nonce, &key)
_, err = enc.Write(b)
if err != nil {
log.Fatalf("Failed to write temp config file: %v", err)
return errors.Errorf("Failed to write temp config file: %v", err)
}
_ = enc.Close()
}
err = f.Close()
if err != nil {
log.Fatalf("Failed to close config file: %v", err)
return errors.Errorf("Failed to close config file: %v", err)
}
var fileMode os.FileMode = 0600
@ -423,14 +424,31 @@ func SaveConfig() {
}
if err = os.Rename(ConfigPath, ConfigPath+".old"); err != nil && !os.IsNotExist(err) {
log.Fatalf("Failed to move previous config to backup location: %v", err)
return errors.Errorf("Failed to move previous config to backup location: %v", err)
}
if err = os.Rename(f.Name(), ConfigPath); err != nil {
log.Fatalf("Failed to move newly written config from %s to final location: %v", f.Name(), err)
return errors.Errorf("Failed to move newly written config from %s to final location: %v", f.Name(), err)
}
if err := os.Remove(ConfigPath + ".old"); err != nil && !os.IsNotExist(err) {
fs.Errorf(nil, "Failed to remove backup config file: %v", err)
}
return nil
}
// SaveConfig calling function which saves configuration file.
// if saveConfig returns error trying again after sleep.
func SaveConfig() {
var err error
for i := 0; i < fs.Config.LowLevelRetries+1; i++ {
if err = saveConfig(); err == nil {
return
}
waitingTimeMs := mathrand.Intn(1000)
time.Sleep(time.Duration(waitingTimeMs) * time.Millisecond)
}
log.Fatalf("Failed to save config after %d tries: %v", fs.Config.LowLevelRetries, err)
return
}
// SetValueAndSave sets the key to the value and saves just that