From 12741539eafc200dda6d152f2c9e47dab8e834de Mon Sep 17 00:00:00 2001
From: Mike Hiretsky <mh@calculate.ru>
Date: Wed, 1 Sep 2010 14:02:24 +0400
Subject: [PATCH] Add class process for run system command

---
 pym/cl_utils.py | 101 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 101 insertions(+)

diff --git a/pym/cl_utils.py b/pym/cl_utils.py
index e6bb4dc..b1bb74f 100644
--- a/pym/cl_utils.py
+++ b/pym/cl_utils.py
@@ -20,6 +20,7 @@ from random import choice
 import os
 import types
 import subprocess
+from subprocess import Popen,PIPE,STDOUT
 import stat
 from shutil import copytree, rmtree
 import ctypes
@@ -144,6 +145,106 @@ class scanDirectory:
                         break
         return ret
 
+class process:
+    """Execute system command by Popen
+    
+    Example:
+    #execute program and get result
+    if process("/bin/gzip","/boot/somefile").success():
+        print "Gzip success"
+
+    #unzip and process unzip data by cpio (list files)
+    processGzip = process("/bin/gzip","-dc","/boot/initrd")
+    processCpio = process("/bin/cpio","-tf",stdin=processGzip)
+    filelist = processCpio.readlines()
+
+    #execute command and send data
+    processGrub = process("/sbin/grub")
+    processGrub.write("root (hd0,0)\n")
+    processGrub.write("setup (hd0)\n")
+    processGrub.write("quit\n")
+    isok = processGrub.success()
+
+    #union stdout and stderr
+    process("/bin/ls","/",stderr=STDOUT)
+    """
+    def __init__(self,command,*params,**kwarg):
+        if not "stdin" in kwarg:
+            stdin=self._defaultStdin
+        else:
+            stdin=kwarg["stdin"].getStdout
+        self.stderr = kwarg.get("stderr",PIPE)
+        self.command = [command] + list(params)
+        self.stdin = stdin
+        self.iter = None
+        self.pipe = None
+        self.cacheresult = None
+        self.communicated = False
+
+    def _open(self):
+        """Open pipe if it not open"""
+        if not self.pipe:
+            self.pipe = Popen(self.command,
+                              stdout=PIPE,
+                              stdin=self.stdin(),
+                              stderr=self.stderr)
+
+    def _defaultStdin(self):
+        """Return default stdin"""
+        return PIPE
+
+    def getStdout(self):
+        """Get current stdout"""
+        self.close()
+        return self.pipe.stdout
+
+    def write(self,data):
+        """Write to process stdin"""
+        self._open()
+        self.pipe.stdin.write(data)
+        self.pipe.stdin.flush()
+
+    def close(self):
+        """Close stdin"""
+        if self.pipe:
+            self.pipe.stdin.close()
+
+    def read(self):
+        """Read all data"""
+        self._open()
+        if not self.cacheresult:
+            self.cacheresult = self.pipe.communicate()[0]
+        return self.cacheresult
+
+    def readlines(self):
+        """Read lines"""
+        return self.read().split('\n')
+
+    def __iter__(self):
+        """Get iterator"""
+        if not self.iter:
+            self.iter = iter(self.readlines())
+        return self.iter
+
+    def next(self):
+        """Next string from stdout"""
+        return self.__iter__().next()
+
+    def returncode(self):
+        """Get return code"""
+        self._open()
+        if self.pipe.returncode == None:
+            self.cacheresult = self.pipe.communicate()
+        return self.pipe.returncode
+
+    def success(self):
+        """Success or not"""
+        return self.returncode() == 0
+
+    def failed(self):
+        """Failed or not"""
+        return self.returncode() != 0
+
 def runOsCommand(cmd,inStr=None,ret_first=None,env_dict=None,ret_list=False):
     """Выполняет внешнюю программу