[KVM-AUTOTEST PATCH v2 4/6] [RFC] Embed context information in exception strings

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Exceptions look for a ._context attribute and embed it in the string returned
by __str__().  If the attribute isn't set (or if it's an empty string) nothing
is embedded.

Signed-off-by: Michael Goldish <mgoldish@xxxxxxxxxx>
---
 client/common_lib/error.py |   10 +++++++++-
 1 files changed, 9 insertions(+), 1 deletions(-)

diff --git a/client/common_lib/error.py b/client/common_lib/error.py
index 952f977..ff22d84 100644
--- a/client/common_lib/error.py
+++ b/client/common_lib/error.py
@@ -126,7 +126,8 @@ class JobComplete(SystemExit):
 
 class AutotestError(Exception):
     """The parent of all errors deliberatly thrown within the client code."""
-    pass
+    def __str__(self):
+        return Exception.__str__(self) + _context_message(self)
 
 
 class JobError(AutotestError):
@@ -148,6 +149,8 @@ class UnhandledJobError(JobError):
             msg = "Unhandled %s: %s"
             msg %= (self.unhandled_exception.__class__.__name__,
                     self.unhandled_exception)
+            if not isinstance(self.unhandled_exception, AutotestError):
+                msg += _context_message(self.unhandled_exception)
             msg += "\n" + self.traceback
             return msg
 
@@ -194,6 +197,8 @@ class UnhandledTestError(TestError):
             msg = "Unhandled %s: %s"
             msg %= (self.unhandled_exception.__class__.__name__,
                     self.unhandled_exception)
+            if not isinstance(self.unhandled_exception, AutotestError):
+                msg += _context_message(self.unhandled_exception)
             msg += "\n" + self.traceback
             return msg
 
@@ -212,6 +217,8 @@ class UnhandledTestFail(TestFail):
             msg = "Unhandled %s: %s"
             msg %= (self.unhandled_exception.__class__.__name__,
                     self.unhandled_exception)
+            if not isinstance(self.unhandled_exception, AutotestError):
+                msg += _context_message(self.unhandled_exception)
             msg += "\n" + self.traceback
             return msg
 
@@ -236,6 +243,7 @@ class CmdError(TestError):
 
         if self.additional_text:
             msg += ", " + self.additional_text
+        msg += _context_message(self)
         msg += '\n' + repr(self.result_obj)
         return msg
 
-- 
1.7.3.4

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