Add new "-wpanic" option and enable it for the automated tests

Documentation/MANPAGE.md

@@ -104,6 +104,10 @@ mounting but makes the password susceptible to brute-force attacks (default 16)
 **-version**
 :	Print version and exit
 
+**-wpanic**
+:	When encountering a warning, panic and exit immediately. This is
+useful in regression testing.
+
 **-zerokey**
 :	Use all-zero dummy master key. This options is only intended for
 automated testing as it does not provide any security.

cryptfs/log.go

@@ -2,6 +2,7 @@ package cryptfs
 
 import (
 	"encoding/json"
+	"fmt"
 	"log"
 	"os"
 )
@@ -17,7 +18,10 @@ func JSONDump(obj interface{}) string {
 
 // toggledLogger - a Logger than can be enabled and disabled
 type toggledLogger struct {
+	// Enable or disable output
 	Enabled bool
+	// Panic after logging a message, useful in regression tests
+	PanicAfter bool
 	*log.Logger
 }
 
@@ -26,12 +30,18 @@ func (l *toggledLogger) Printf(format string, v ...interface{}) {
 		return
 	}
 	l.Logger.Printf(format, v...)
+	if l.PanicAfter {
+		panic("PanicAfter: " + fmt.Sprintf(format, v...))
+	}
 }
 func (l *toggledLogger) Println(v ...interface{}) {
 	if !l.Enabled {
 		return
 	}
 	l.Logger.Println(v...)
+	if l.PanicAfter {
+		panic("PanicAfter: " + fmt.Sprintln(v...))
+	}
 }
 
 // As defined by http://elinux.org/Debugging_by_printing#Log_Levels
@@ -45,7 +55,7 @@ var Info *toggledLogger
 var Warn *toggledLogger
 
 func init() {
-	Debug = &toggledLogger{false, log.New(os.Stdout, "", 0)}
-	Info = &toggledLogger{true, log.New(os.Stdout, "", 0)}
-	Warn = &toggledLogger{true, log.New(os.Stderr, "", 0)}
+	Debug = &toggledLogger{false, false, log.New(os.Stdout, "", 0)}
+	Info = &toggledLogger{true, false, log.New(os.Stdout, "", 0)}
+	Warn = &toggledLogger{true, false, log.New(os.Stderr, "", 0)}
 }

integration_tests/helpers.go

@@ -53,7 +53,7 @@ func resetTmpDir() {
 func mount(c string, p string, extraArgs ...string) {
 	var args []string
 	args = append(args, extraArgs...)
-	args = append(args, "-q")
+	args = append(args, "-q", "-wpanic")
 	//args = append(args, "--fusedebug")
 	args = append(args, c)
 	args = append(args, p)

main.go

@@ -37,7 +37,7 @@ const (
 
 type argContainer struct {
 	debug, init, zerokey, fusedebug, openssl, passwd, foreground, version,
-	plaintextnames, quiet, diriv, emenames, gcmiv128, nosyslog bool
+	plaintextnames, quiet, diriv, emenames, gcmiv128, nosyslog, wpanic bool
 	masterkey, mountpoint, cipherdir, cpuprofile, config, extpass,
 	memprofile string
 	notifypid, scryptn int
@@ -160,6 +160,7 @@ func main() {
 	flagSet.BoolVar(&args.emenames, "emenames", true, "Use EME filename encryption. This option implies diriv.")
 	flagSet.BoolVar(&args.gcmiv128, "gcmiv128", true, "Use an 128-bit IV for GCM encryption instead of Go's default of 96 bits")
 	flagSet.BoolVar(&args.nosyslog, "nosyslog", false, "Do not redirect output to syslog when running in the background")
+	flagSet.BoolVar(&args.wpanic, "wpanic", false, "When encountering a warning, panic and exit immediately")
 	flagSet.StringVar(&args.masterkey, "masterkey", "", "Mount with explicit master key")
 	flagSet.StringVar(&args.cpuprofile, "cpuprofile", "", "Write cpu profile to specified file")
 	flagSet.StringVar(&args.memprofile, "memprofile", "", "Write memory profile to specified file")
@@ -184,6 +185,10 @@ func main() {
 		cryptfs.Debug.Enabled = true
 		cryptfs.Debug.Printf("Debug output enabled")
 	}
+	if args.wpanic {
+		cryptfs.Warn.PanicAfter = true
+		cryptfs.Debug.Printf("Panicing on warnings")
+	}
 	// Every operation below requires CIPHERDIR. Check that we have it.
 	if flagSet.NArg() >= 1 {
 		args.cipherdir, _ = filepath.Abs(flagSet.Arg(0))

pathfs_frontend/names.go

@@ -15,7 +15,7 @@ func (fs *FS) isFiltered(path string) bool {
 	}
 	// gocryptfs.conf in the root directory is forbidden
 	if path == cryptfs.ConfDefaultName {
-		cryptfs.Warn.Printf("The name /%s is reserved when -plaintextnames is used\n",
+		cryptfs.Info.Printf("The name /%s is reserved when -plaintextnames is used\n",
 			cryptfs.ConfDefaultName)
 		return true
 	}