Merge pull request #72 from twpayne/ignore-group-lookup-errors

Ignore group lookup errors, fixes #65

cmd/cmd.go

@@ -113,11 +113,12 @@ func getDefaultData() (map[string]interface{}, error) {
 	}
 	data["username"] = currentUser.Username
 
-	group, err := user.LookupGroupId(currentUser.Gid)
-	if err != nil {
-		return nil, err
+	// user.LookupGroupId reads /etc/group, which is not populated on some
+	// systems, causing lookup to fail. Instead of returning the error, simply
+	// ignore it and only set group if lookup succeeds.
+	if group, err := user.LookupGroupId(currentUser.Gid); err == nil {
+		data["group"] = group.Name
 	}
-	data["group"] = group.Name
 
 	homedir, err := homedir.Dir()
 	if err != nil {