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fully write new config file before moving to target location (fixes #1287)

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* fully write new config file before moving to target location (fixes #1287)
* do not fail if there is no previous config; print temporary config path on failure
This commit is contained in:
Stefan 2017-06-01 09:57:10 +02:00 committed by Nick Craig-Wood
parent decd960867
commit 9cede6b372
1 changed files with 53 additions and 39 deletions
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92
fs/config.go
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@ -16,6 +16,7 @@ import (
"log"
"os"
"os/user"
"path"
"path/filepath"
"regexp"
"sort"
@ -589,62 +590,75 @@ func changeConfigPassword() {
// SaveConfig saves configuration file.
// if configKey has been set, the file will be encrypted.
func SaveConfig() {
if len(configKey) == 0 {
err := goconfig.SaveConfigFile(configData, ConfigPath)
if err != nil {
log.Fatalf("Failed to save config file: %v", err)
}
err = os.Chmod(ConfigPath, 0600)
if err != nil {
Errorf(nil, "Failed to set permissions on config file: %v", err)
}
dir, name := path.Split(ConfigPath)
f, err := ioutil.TempFile(dir, name)
if err != nil {
log.Fatalf("Failed to create temp file for new config: %v", err)
return
}
defer func() {
if err := os.Remove(f.Name()); err != nil && !os.IsNotExist(err) {
Errorf(nil, "Failed to remove temp config file: %v", err)
}
}()
var buf bytes.Buffer
err := goconfig.SaveConfigData(configData, &buf)
err = goconfig.SaveConfigData(configData, &buf)
if err != nil {
log.Fatalf("Failed to save config file: %v", err)
}
f, err := os.Create(ConfigPath)
if err != nil {
log.Fatalf("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)
}
} else {
fmt.Fprintln(f, "# Encrypted rclone configuration File")
fmt.Fprintln(f, "")
fmt.Fprintln(f, "RCLONE_ENCRYPT_V0:")
// Generate new nonce and write it to the start of the ciphertext
var nonce [24]byte
n, _ := rand.Read(nonce[:])
if n != 24 {
log.Fatalf("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)
}
var key [32]byte
copy(key[:], configKey[:32])
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)
}
_ = enc.Close()
}
fmt.Fprintln(f, "# Encrypted rclone configuration File")
fmt.Fprintln(f, "")
fmt.Fprintln(f, "RCLONE_ENCRYPT_V0:")
// Generate new nonce and write it to the start of the ciphertext
var nonce [24]byte
n, _ := rand.Read(nonce[:])
if n != 24 {
log.Fatalf("nonce short read: %d", n)
}
enc := base64.NewEncoder(base64.StdEncoding, f)
_, err = enc.Write(nonce[:])
if err != nil {
log.Fatalf("Failed to write config file: %v", err)
}
var key [32]byte
copy(key[:], configKey[:32])
b := secretbox.Seal(nil, buf.Bytes(), &nonce, &key)
_, err = enc.Write(b)
if err != nil {
log.Fatalf("Failed to write config file: %v", err)
}
_ = enc.Close()
err = f.Close()
if err != nil {
log.Fatalf("Failed to close config file: %v", err)
}
err = os.Chmod(ConfigPath, 0600)
err = os.Chmod(f.Name(), 0600)
if err != nil {
Errorf(nil, "Failed to set permissions on config file: %v", err)
}
if err = os.Rename(ConfigPath, ConfigPath+".old"); err != nil && !os.IsNotExist(err) {
log.Fatalf("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)
}
if err := os.Remove(ConfigPath + ".old"); err != nil && !os.IsNotExist(err) {
Errorf(nil, "Failed to remove backup config file: %v", err)
}
}
// ConfigSetValueAndSave sets the key to the value and saves just that