[tor-commits] [obfs4/master] Display a more useful error on JSON Unmarshall failure.

[yawning@xxxxxxxxxxxxxx]

commit 468cd4bde80419824beb20d02c32315f46288d13
Author: Yawning Angel <yawning@xxxxxxxxxxxxxx>
Date:   Wed Aug 27 03:52:22 2014 +0000

    Display a more useful error on JSON Unmarshall failure.
---
 transports/obfs4/statefile.go |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/transports/obfs4/statefile.go b/transports/obfs4/statefile.go
index 378eefa..7949dd9 100644
--- a/transports/obfs4/statefile.go
+++ b/transports/obfs4/statefile.go
@@ -98,7 +98,8 @@ func serverStateFromJSONServerState(js *jsonServerState) (*obfs4ServerState, err
 }
 
 func jsonServerStateFromFile(stateDir string, js *jsonServerState) error {
-	f, err := ioutil.ReadFile(path.Join(stateDir, stateFile))
+	fPath := path.Join(stateDir, stateFile)
+	f, err := ioutil.ReadFile(fPath)
 	if err != nil {
 		if os.IsNotExist(err) {
 			if err = newJSONServerState(stateDir, js); err == nil {
@@ -109,7 +110,7 @@ func jsonServerStateFromFile(stateDir string, js *jsonServerState) error {
 	}
 
 	if err = json.Unmarshal(f, js); err != nil {
-		return err
+		return fmt.Errorf("failed to load statefile '%s': %s", fPath, err)
 	}
 
 	return nil

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