Add log and link aliasing to BuildBot.

scripts/master/chromium_step.py

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Subclasses of various slave command classes."""
 
 from datetime import datetime
 import copy
 import errno
 import json
@@ skipping 487 matching lines @@
   Add a new step <stepname> after the last step. Do not end the step at the
   cursor, don't advance the cursor to the seeded step.
 
   @@@STEP_CURSOR <stepname>@@@
   Set the cursor to the named step. All further commands apply to the current
   cursor.
 
   @@@STEP_LINK@<label>@<url>@@@
   Add a link with label <label> linking to <url> to the current stage.
 
+  If the label value is of the form "text-->base", this is considered an alias
+  link, and will add an alias named "text" with the value "url" to the log or
+  link named "base".
+
   @@@STEP_STARTED@@@
   Start the step at the cursor location.
 
   @@@STEP_WARNINGS@@@
   Mark the current step as having warnings (orange).
 
   @@@STEP_FAILURE@@@
   Mark the current step as having failed (red).
 
   @@@STEP_EXCEPTION@@@
@@ skipping 499 matching lines @@
     # then add the new graph list to the main graph list.
     graph_list.extend(new_graph_list)
 
     # Write the resulting graph list.
     graph_file = open(graph_filename, 'w')
     json.dump(graph_list, graph_file)
     graph_file.close()
     os.chmod(graph_filename, EXECUTABLE_FILE_PERMISSIONS)
 
   def addLinkToCursor(self, link_label, link_url):
-    self.cursor['links'].append((link_label, link_url))
-    self.cursor['step'].addURL(link_label, link_url)
+    parts = link_label.split('-->', 1)

[dnj, 2016/03/18 01:52:46]

I'm not a huge fan of "-->". If something inspiring comes to mind, feel free to
suggest it.

+    link_alias = None
+    if len(parts) == 2:
+      link_alias, link_label = parts
+
+    self.cursor['links'].append((link_label, link_url, link_alias))
+    if not link_alias:
+      self.cursor['step'].addURL(link_label, link_url, alias_text=link_alias)
+    else:
+      self.cursor['step'].addAlias(link_label, link_url, text=link_alias)
 
   def handleOutputLine(self, line):
     """This is called once with each line of the test log."""
     # Handle initial setup here, as step_status might not exist yet at init.
     self.initialSection()
 
     annotator.MatchAnnotation(line.rstrip(), self)
 
   def addLogLines(self, log_label, log_lines):
     self.cursor['annotated_logs'].setdefault(log_label, []).extend(log_lines)
@@ skipping 492 matching lines @@
       and starts to wait for remaining steps to finish. Returns command_result
       as Deferred."""
       self.scriptComplete(command_result)
       steps_d = self.script_observer.waitForSteps()
       # Ignore the waitForSteps' result and return the original result,
       # so the caller of runCommand receives command_result.
       steps_d.addCallback(lambda *_: command_result)
       return steps_d
     d.addCallback(onCommandFinished)
     return d