func do() bool {
if err := system.IsSafe(); err != nil {
fmt.Fprintf(os.Stderr, "System checks failed: %s\n", err)
return false
}
editor := os.Getenv("EDITOR")
if len(editor) == 0 {
fmt.Fprintf(os.Stderr, "$EDITOR is not set\n")
return false
}
stateFile := &disk.StateFile{
Path: *stateFileName,
Rand: crypto_rand.Reader,
Log: func(format string, args ...interface{}) {
fmt.Fprintf(os.Stderr, format, args...)
},
}
stateLock, err := stateFile.Lock(false /* don't create */)
if err != nil {
fmt.Fprintf(os.Stderr, "Cannot open state file: %s\n", err)
return false
}
if stateLock == nil {
fmt.Fprintf(os.Stderr, "Cannot obtain lock on state file\n")
return false
}
defer stateLock.Close()
var state *disk.State
var passphrase string
for {
state, err = stateFile.Read(passphrase)
if err == nil {
break
}
if err != disk.BadPasswordError {
fmt.Fprintf(os.Stderr, "Failed to decrypt state file: %s\n", err)
return false
}
fmt.Fprintf(os.Stderr, "Passphrase: ")
passphraseBytes, err := terminal.ReadPassword(0)
fmt.Fprintf(os.Stderr, "\n")
if err != nil {
fmt.Fprintf(os.Stderr, "Failed to read password\n")
return false
}
passphrase = string(passphraseBytes)
}
tempDir, err := system.SafeTempDir()
if err != nil {
fmt.Fprintf(os.Stderr, "Failed to get safe temp directory: %s\n", err)
return false
}
tempFile, err := ioutil.TempFile(tempDir, "pond-editstate-")
if err != nil {
fmt.Fprintf(os.Stderr, "Failed to create temp file: %s\n", err)
return false
}
tempFileName := tempFile.Name()
defer func() {
os.Remove(tempFileName)
}()
signals := make(chan os.Signal, 8)
signal.Notify(signals, syscall.SIGHUP, syscall.SIGINT, syscall.SIGTERM)
go func() {
<-signals
println("Caught signal: removing", tempFileName)
os.Remove(tempFileName)
os.Exit(1)
}()
entities := serialise(tempFile, state)
var newStateSerialized []byte
for {
cmd := exec.Command(editor, tempFileName)
cmd.Stdin = os.Stdin
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
if err := cmd.Run(); err != nil {
fmt.Fprintf(os.Stderr, "Failed to run editor: %s\n", err)
return false
}
tempFile.Close()
tempFile, err := os.Open(tempFileName)
if err != nil {
fmt.Fprintf(os.Stderr, "Failed to open temp file: %s\n", err)
return false
}
newState := new(disk.State)
err = parse(newState, tempFile, entities)
if err == nil {
newStateSerialized, err = proto.Marshal(newState)
}
if err == nil {
break
}
fmt.Fprintf(os.Stderr, "Error parsing: %s\n", err)
fmt.Fprintf(os.Stderr, "Hit enter to edit again, or Ctrl-C to abort\n")
var buf [100]byte
os.Stdin.Read(buf[:])
}
states := make(chan disk.NewState)
done := make(chan struct{})
go stateFile.StartWriter(states, done)
states <- disk.NewState{newStateSerialized, false}
close(states)
<-done
return true
}
func do() bool {
if err := system.IsSafe(); err != nil {
fmt.Fprintf(os.Stderr, "System checks failed: %s\n", err)
return false
}
editor := os.Getenv("EDITOR")
if len(editor) == 0 {
fmt.Fprintf(os.Stderr, "$EDITOR is not set\n")
return false
}
stateFile, err := os.Open(*stateFileName)
if err != nil {
fmt.Fprintf(os.Stderr, "Failed to open state file: %s\n", err)
return false
}
defer stateFile.Close()
stateLock, ok := disk.LockStateFile(stateFile)
if !ok {
fmt.Fprintf(os.Stderr, "Cannot obtain lock on state file\n")
return false
}
defer stateLock.Close()
encrypted, err := ioutil.ReadAll(stateFile)
if err != nil {
fmt.Fprintf(os.Stderr, "Failed to read state file: %s\n", err)
return false
}
salt, ok := disk.GetSCryptSaltFromState(encrypted)
if !ok {
fmt.Fprintf(os.Stderr, "State file is too short to be valid\n")
return false
}
var state *disk.State
var key [32]byte
for {
state, err = disk.LoadState(encrypted, &key)
if err == nil {
break
}
if err != disk.BadPasswordError {
fmt.Fprintf(os.Stderr, "Failed to decrypt state file: %s\n", err)
return false
}
fmt.Fprintf(os.Stderr, "Passphrase: ")
password, err := terminal.ReadPassword(0)
fmt.Fprintf(os.Stderr, "\n")
if err != nil {
fmt.Fprintf(os.Stderr, "Failed to read password\n")
return false
}
keySlice, err := disk.DeriveKey(string(password), &salt)
copy(key[:], keySlice)
}
tempDir, err := system.SafeTempDir()
if err != nil {
fmt.Fprintf(os.Stderr, "Failed to get safe temp directory: %s\n", err)
return false
}
tempFile, err := ioutil.TempFile(tempDir, "pond-editstate-")
if err != nil {
fmt.Fprintf(os.Stderr, "Failed to create temp file: %s\n", err)
return false
}
tempFileName := tempFile.Name()
defer func() {
os.Remove(tempFileName)
}()
signals := make(chan os.Signal, 8)
signal.Notify(signals, syscall.SIGHUP, syscall.SIGINT, syscall.SIGTERM)
go func() {
<-signals
println("Caught signal: removing", tempFileName)
os.Remove(tempFileName)
os.Exit(1)
}()
entities := serialise(tempFile, state)
var newStateSerialized []byte
for {
cmd := exec.Command(editor, tempFileName)
cmd.Stdin = os.Stdin
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
if err := cmd.Run(); err != nil {
fmt.Fprintf(os.Stderr, "Failed to run editor: %s\n", err)
return false
}
tempFile.Close()
tempFile, err := os.Open(tempFileName)
if err != nil {
fmt.Fprintf(os.Stderr, "Failed to open temp file: %s\n", err)
return false
}
newState := new(disk.State)
err = parse(newState, tempFile, entities)
if err == nil {
newStateSerialized, err = proto.Marshal(newState)
}
if err == nil {
break
}
fmt.Fprintf(os.Stderr, "Error parsing: %s\n", err)
fmt.Fprintf(os.Stderr, "Hit enter to edit again, or Ctrl-C to abort\n")
var buf [100]byte
os.Stdin.Read(buf[:])
}
states := make(chan []byte)
done := make(chan bool)
go disk.StateWriter(*stateFileName, &key, &salt, states, done)
states <- newStateSerialized
close(states)
<-done
return true
}