patman: Adjust 'command' to return strings instead of bytes

At present all the 'command' methods return bytes. Most of the time we
actually want strings, so change this. We still need to keep the internal
representation as bytes since otherwise unicode strings might break over
a read() boundary (e.g. 4KB), causing errors. But we can convert the end
result to strings.

Add a 'binary' parameter to cover the few cases where bytes are needed.

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

tools/binman/cbfs_util_test.py

@@ -56,7 +56,7 @@ class TestCbfs(unittest.TestCase):
         cls.have_lz4 = True
         try:
             tools.Run('lz4', '--no-frame-crc', '-c',
-                      tools.GetInputFilename('u-boot.bin'))
+                      tools.GetInputFilename('u-boot.bin'), binary=True)
         except:
             cls.have_lz4 = False
 

tools/binman/ftest.py

@@ -174,7 +174,7 @@ class TestFunctional(unittest.TestCase):
         cls.have_lz4 = True
         try:
             tools.Run('lz4', '--no-frame-crc', '-c',
-                      os.path.join(cls._indir, 'u-boot.bin'))
+                      os.path.join(cls._indir, 'u-boot.bin'), binary=True)
         except:
             cls.have_lz4 = False
 

tools/patman/command.py

@@ -4,6 +4,7 @@
 
 import os
 import cros_subprocess
+import tools
 
 """Shell command ease-ups for Python."""
 
@@ -31,6 +32,13 @@ class CommandResult:
         self.return_code = return_code
         self.exception = exception
 
+    def ToOutput(self, binary):
+        if not binary:
+            self.stdout = tools.ToString(self.stdout)
+            self.stderr = tools.ToString(self.stderr)
+            self.combined = tools.ToString(self.combined)
+        return self
+
 
 # This permits interception of RunPipe for test purposes. If it is set to
 # a function, then that function is called with the pipe list being
@@ -41,7 +49,7 @@ test_result = None
 
 def RunPipe(pipe_list, infile=None, outfile=None,
             capture=False, capture_stderr=False, oneline=False,
-            raise_on_error=True, cwd=None, **kwargs):
+            raise_on_error=True, cwd=None, binary=False, **kwargs):
     """
     Perform a command pipeline, with optional input/output filenames.
 
@@ -67,7 +75,7 @@ def RunPipe(pipe_list, infile=None, outfile=None,
         else:
             return test_result
         # No result: fall through to normal processing
-    result = CommandResult()
+    result = CommandResult(b'', b'', b'')
     last_pipe = None
     pipeline = list(pipe_list)
     user_pipestr =  '|'.join([' '.join(pipe) for pipe in pipe_list])
@@ -93,29 +101,36 @@ def RunPipe(pipe_list, infile=None, outfile=None,
             if raise_on_error:
                 raise Exception("Error running '%s': %s" % (user_pipestr, str))
             result.return_code = 255
-            return result
+            return result.ToOutput(binary)
 
     if capture:
         result.stdout, result.stderr, result.combined = (
                 last_pipe.CommunicateFilter(None))
         if result.stdout and oneline:
-            result.output = result.stdout.rstrip('\r\n')
+            result.output = result.stdout.rstrip(b'\r\n')
         result.return_code = last_pipe.wait()
     else:
         result.return_code = os.waitpid(last_pipe.pid, 0)[1]
     if raise_on_error and result.return_code:
         raise Exception("Error running '%s'" % user_pipestr)
-    return result
+    return result.ToOutput(binary)
 
 def Output(*cmd, **kwargs):
     kwargs['raise_on_error'] = kwargs.get('raise_on_error', True)
     return RunPipe([cmd], capture=True, **kwargs).stdout
 
 def OutputOneLine(*cmd, **kwargs):
+    """Run a command and output it as a single-line string
+
+    The command us expected to produce a single line of output
+
+    Returns:
+        String containing output of command
+    """
     raise_on_error = kwargs.pop('raise_on_error', True)
-    return (RunPipe([cmd], capture=True, oneline=True,
+    result = RunPipe([cmd], capture=True, oneline=True,
-            raise_on_error=raise_on_error,
+                     raise_on_error=raise_on_error, **kwargs).stdout.strip()
-            **kwargs).stdout.strip())
+    return result
 
 def Run(*cmd, **kwargs):
     return RunPipe([cmd], **kwargs).stdout

tools/patman/tools.py

@@ -186,7 +186,7 @@ def PathHasFile(path_spec, fname):
             return True
     return False
 
-def Run(name, *args):
+def Run(name, *args, **kwargs):
     """Run a tool with some arguments
 
     This runs a 'tool', which is a program used by binman to process files and
@@ -201,13 +201,14 @@ def Run(name, *args):
         CommandResult object
     """
     try:
+        binary = kwargs.get('binary')
         env = None
         if tool_search_paths:
             env = dict(os.environ)
             env['PATH'] = ':'.join(tool_search_paths) + ':' + env['PATH']
         all_args = (name,) + args
         result = command.RunPipe([all_args], capture=True, capture_stderr=True,
-                                 env=env, raise_on_error=False)
+                                 env=env, raise_on_error=False, binary=binary)
         if result.return_code:
             raise Exception("Error %d running '%s': %s" %
                (result.return_code,' '.join(all_args),
@@ -375,7 +376,7 @@ def ToBytes(string):
     """Convert a str type into a bytes type
 
     Args:
-        string: string to convert value
+        string: string to convert
 
     Returns:
         Python 3: A bytes type
@@ -385,6 +386,18 @@ def ToBytes(string):
         return string.encode('utf-8')
     return string
 
+def ToString(bval):
+    """Convert a bytes type into a str type
+
+    Args:
+        bval: bytes value to convert
+
+    Returns:
+        Python 3: A bytes type
+        Python 2: A string type
+    """
+    return bval.decode('utf-8')
+
 def Compress(indata, algo, with_header=True):
     """Compress some data using a given algorithm
 
@@ -406,14 +419,14 @@ def Compress(indata, algo, with_header=True):
     fname = GetOutputFilename('%s.comp.tmp' % algo)
     WriteFile(fname, indata)
     if algo == 'lz4':
-        data = Run('lz4', '--no-frame-crc', '-c', fname)
+        data = Run('lz4', '--no-frame-crc', '-c', fname, binary=True)
     # cbfstool uses a very old version of lzma
     elif algo == 'lzma':
         outfname = GetOutputFilename('%s.comp.otmp' % algo)
         Run('lzma_alone', 'e', fname, outfname, '-lc1', '-lp0', '-pb0', '-d8')
         data = ReadFile(outfname)
     elif algo == 'gzip':
-        data = Run('gzip', '-c', fname)
+        data = Run('gzip', '-c', fname, binary=True)
     else:
         raise ValueError("Unknown algorithm '%s'" % algo)
     if with_header:
@@ -446,13 +459,13 @@ def Decompress(indata, algo, with_header=True):
     with open(fname, 'wb') as fd:
         fd.write(indata)
     if algo == 'lz4':
-        data = Run('lz4', '-dc', fname)
+        data = Run('lz4', '-dc', fname, binary=True)
     elif algo == 'lzma':
         outfname = GetOutputFilename('%s.decomp.otmp' % algo)
         Run('lzma_alone', 'd', fname, outfname)
-        data = ReadFile(outfname)
+        data = ReadFile(outfname, binary=True)
     elif algo == 'gzip':
-        data = Run('gzip', '-cd', fname)
+        data = Run('gzip', '-cd', fname, binary=True)
     else:
         raise ValueError("Unknown algorithm '%s'" % algo)
     return data