[RFC 1/2] patman: introduce RunException

[Heiko Thiery <heiko.thiery@gmail.com>]

The RunException will be throws when the a command's return_code is not
equal zero. With this an external caller can catch that and has access
to the command/args, the result code, the stdout and stderr output.

Signed-off-by: Heiko Thiery <heiko.thiery@gmail.com>
---
 tools/patman/tools.py | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/tools/patman/tools.py b/tools/patman/tools.py
index 710f1fdcd3..ca1c9114ab 100644
--- a/tools/patman/tools.py
+++ b/tools/patman/tools.py
@@ -313,6 +313,18 @@ def GetTargetCompileTool(name, cross_compile=None):
         target_name = name
     return target_name, extra_args
 
+class RunException(Exception):
+    """Exception that is thrown when the command fails"""
+    def __init__(self, args, result):
+        self.args = args
+        self.stdout = result.stdout.strip()
+        self.stderr = result.stderr.strip()
+        self.return_code = result.return_code
+
+    def __str__(self):
+        return ("Error %d running '%s': %s" %
+               (self.return_code,' '.join(self.args), self.stderr))
+
 def Run(name, *args, **kwargs):
     """Run a tool with some arguments
 
@@ -349,9 +361,7 @@ def Run(name, *args, **kwargs):
         result = command.RunPipe([all_args], capture=True, capture_stderr=True,
                                  env=env, raise_on_error=False, binary=binary)
         if result.return_code:
-            raise Exception("Error %d running '%s': %s" %
-               (result.return_code,' '.join(all_args),
-                result.stderr))
+            raise RunException(all_args, result)
         return result.stdout
     except:
         if env and not PathHasFile(env['PATH'], name):
-- 
2.30.2