lib/oe/process.py: import from OE

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oe/process.py

@@ -0,0 +1,74 @@
+import subprocess
+import signal
+
+def subprocess_setup():
+    # Python installs a SIGPIPE handler by default. This is usually not what
+    # non-Python subprocesses expect.
+    signal.signal(signal.SIGPIPE, signal.SIG_DFL)
+
+class CmdError(RuntimeError):
+    def __init__(self, command):
+        self.command = command
+
+    def __str__(self):
+        if not isinstance(self.command, basestring):
+            cmd = subprocess.list2cmdline(self.command)
+        else:
+            cmd = self.command
+
+        return "Execution of '%s' failed" % cmd
+
+class NotFoundError(CmdError):
+    def __str__(self):
+        return CmdError.__str__(self) + ": command not found"
+
+class ExecutionError(CmdError):
+    def __init__(self, command, exitcode, stdout = None, stderr = None):
+        CmdError.__init__(self, command)
+        self.exitcode = exitcode
+        self.stdout = stdout
+        self.stderr = stderr
+
+    def __str__(self):
+        message = ""
+        if self.stderr:
+            message += self.stderr
+        if self.stdout:
+            message += self.stdout
+        if message:
+            message = ":\n" + message
+        return (CmdError.__str__(self) +
+                " with exit code %s" % self.exitcode + message)
+
+class Popen(subprocess.Popen):
+    defaults = {
+        "close_fds": True,
+        "preexec_fn": subprocess_setup,
+        "stdout": subprocess.PIPE,
+        "stderr": subprocess.STDOUT,
+        "stdin": subprocess.PIPE,
+        "shell": False,
+    }
+
+    def __init__(self, *args, **kwargs):
+        options = dict(self.defaults)
+        options.update(kwargs)
+        subprocess.Popen.__init__(self, *args, **options)
+
+def run(cmd, input=None, **options):
+    """Convenience function to run a command and return its output, raising an
+    exception when the command fails"""
+
+    if isinstance(cmd, basestring) and not "shell" in options:
+        options["shell"] = True
+    try:
+        pipe = Popen(cmd, **options)
+    except OSError, exc:
+        if exc.errno == 2:
+            raise NotFoundError(cmd)
+        else:
+            raise
+    stdout, stderr = pipe.communicate(input)
+    if pipe.returncode != 0:
+        raise ExecutionError(cmd, pipe.returncode, stdout, stderr)
+    return stdout