patman: Adjust command.Output() to raise an error by default

It is more useful to have this method raise an error when something goes
wrong. Make this the default and adjust the few callers that don't want to
use it this way.

Signed-off-by: Simon Glass <sjg@chromium.org>

tools/buildman/control.py

@@ -237,7 +237,7 @@ def DoBuildman(options, args, toolchains=None, make_func=None, boards=None,
         options.step = len(series.commits) - 1
 
     gnu_make = command.Output(os.path.join(options.git,
-                                           'scripts/show-gnu-make')).rstrip()
+            'scripts/show-gnu-make'), raise_on_error=False).rstrip()
     if not gnu_make:
         sys.exit('GNU Make not found')
 

tools/patman/checkpatch.py

@@ -63,7 +63,8 @@ def CheckPatch(fname, verbose=False):
     result.problems = []
     chk = FindCheckPatch()
     item = {}
-    result.stdout = command.Output(chk, '--no-tree', fname)
+    result.stdout = command.Output(chk, '--no-tree', fname,
+                                   raise_on_error=False)
     #pipe = subprocess.Popen(cmd, stdout=subprocess.PIPE)
     #stdout, stderr = pipe.communicate()
 

tools/patman/command.py

@@ -104,8 +104,9 @@ def RunPipe(pipe_list, infile=None, outfile=None,
         raise Exception("Error running '%s'" % user_pipestr)
     return result
 
-def Output(*cmd):
-    return RunPipe([cmd], capture=True, raise_on_error=False).stdout
+def Output(*cmd, **kwargs):
+    raise_on_error = kwargs.get('raise_on_error', True)
+    return RunPipe([cmd], capture=True, raise_on_error=raise_on_error).stdout
 
 def OutputOneLine(*cmd, **kwargs):
     raise_on_error = kwargs.pop('raise_on_error', True)

tools/patman/gitutil.py

@@ -391,7 +391,8 @@ def EmailPatches(series, cover_fname, args, dry_run, raise_on_error, cc_fname,
     """
     to = BuildEmailList(series.get('to'), '--to', alias, raise_on_error)
     if not to:
-        git_config_to = command.Output('git', 'config', 'sendemail.to')
+        git_config_to = command.Output('git', 'config', 'sendemail.to',
+                                       raise_on_error=False)
         if not git_config_to:
             print ("No recipient.\n"
                    "Please add something like this to a commit\n"