distbuild: Add __str__() and __repr__() to ArtifactReference

This is just to make the log files more readable, as what would
previously have been logged as '<ArtifactReference at 0x1235478>' is
now logged as the actual name of the artifact.

Change-Id: I6189aa1390268cec379dd459fc3f4fecc71363b1

1 files changed, 6 insertions, 0 deletions

diff --git a/distbuild/artifact_reference.py b/distbuild/artifact_reference.py
index bdcfbf23..633ed749 100644
--- a/distbuild/artifact_reference.py
+++ b/distbuild/artifact_reference.py
@@ -30,6 +30,12 @@ class ArtifactReference(object): # pragma: no cover
         self._basename = basename
         self._dict = encoded
 
+    def __str__(self):
+        return self._basename
+
+    def __repr__(self):
+        return '<ArtifactReference: %s>' % self._basename
+
     def __getattr__(self, name):
         if not name.startswith('_'):
             return self._dict[name]