Merge MVP script into cbuildbot.

lib/cros_build_lib.py

Index: lib/cros_build_lib.py
diff --git a/lib/cros_build_lib.py b/lib/cros_build_lib.py
index 8728fe3fb734b99ba3738c5520935e42200a92c2..739bdf98f723eb7f0fabb7b14c59ef2f15e68ac0 100644
--- a/lib/cros_build_lib.py
+++ b/lib/cros_build_lib.py
@@ -95,7 +95,10 @@ def RunCommand(cmd, print_cmd=True, error_ok=False, error_message=None,
 
   # Print out the command before running.
   if print_cmd:
-    Info('RunCommand: %s' % cmd_str)
+    if cwd:
+      Info('RunCommand: %s in %s' % (cmd_str, cwd))
+    else:
+      Info('RunCommand: %s' % cmd_str)
   cmd_result.cmd = cmd
 
   try:
@@ -298,6 +301,24 @@ def GetCallerName():
   return os.path.basename(top_frame.f_code.co_filename)
 
 
+def GetValueFromFile(filename, varname):
+  """

[sosa, 2011/04/11 19:03:54]

One line short docstring on first line i.e. Returns value from a file/key pair

+  Given a NAME, return the VALUE out of a file.  (NAME=VALUE)
+  or the awk equivalent:
+  $ awk -F= '/varname=/ {print $2}' filename
+  """
+  if os.path.isfile(filename):

[sosa, 2011/04/11 19:03:54]

filename can be an obj or file?  I'd think it be cleaner if it was one or the
other

+    file_obj = open(filename, 'r')
+  else:
+    file_obj = filename
+
+  for line in file_obj:
+    if line.startswith(varname + '='):
+      pat = line.split('=', 1)[1]
+      break

[sosa, 2011/04/11 19:03:54]

extra line after

+  return pat.strip()

[sosa, 2011/04/11 19:03:54]

File remains opened :(

+
+
 class RunCommandException(Exception):
   """Raised when there is an error in OldRunCommand."""
   def __init__(self, msg, cmd):