Check the existence and executability of scm commands

gclient_utils.py

Index: gclient_utils.py
===================================================================
--- gclient_utils.py	(revision 132150)
+++ gclient_utils.py	(working copy)
@@ -193,6 +193,17 @@
         raise
 
 
+def FindCommandExecutable(cmd):
+  """Find the specified |cmd| in $PATH and checks if it's executable.
+  Raise an exception if fails.  Otherwise do nothing."""
+  paths = os.environ['PATH'].split(os.pathsep)
+  for path in paths:

[M-A Ruel, 2012/04/13 18:55:25]

for path in os.environ['PATH'].split(os.pathsep):
is fine too.

[Jun Mukai, 2012/04/16 05:39:22]

Done.

+    full_path = os.path.join(path, cmd)
+    if os.path.isfile(full_path) and os.access(full_path, os.X_OK):
+      return full_path
+  return None
+
+
 def CheckCallAndFilterAndHeader(args, always=False, **kwargs):
   """Adds 'header' support to CheckCallAndFilter.