Add return code and error output to raw module

Since we use 'raw' heavily on equipment where 'command' and 'shell' are not (yet) working (and python may need to be installed first using raw) these improvements are necessary in order to write more complex scripts (with return code handling and separated stdout/stderr).

This change includes the following changes:

 - exec_command() now returns the return code of the command
 - _low_level_exec_command() now returns a dict, including 'rc', 'stdout' and 'stderr'
 - all users of the above interfaces have been improved to make use of the above changes
 - all connection plugins have been modified to return rc and stderr
 - fix the newline problem (stdout and stderr would have excess newlines)

In a future commit I intend to add assertions or error handling code to verify the return code in those places where it wasn't done. Since only the output was available, the return code was ignored, even though we expect them to be 0.

lib/ansible/runner/__init__.py

@@ -226,7 +226,7 @@ class Runner(object):
         if tmp.find("tmp") != -1 and C.DEFAULT_KEEP_REMOTE_FILES != '1':
             cmd = cmd + "; rm -rf %s >/dev/null 2>&1" % tmp
         res = self._low_level_exec_command(conn, cmd, tmp, sudoable=True)
-        return ReturnData(conn=conn, result=res)
+        return ReturnData(conn=conn, result=res['stdout'])
 
     # *****************************************************
 
@@ -442,19 +442,22 @@ class Runner(object):
         ''' execute a command string over SSH, return the output '''
 
         sudo_user = self.sudo_user
-        stdin, stdout, stderr = conn.exec_command(cmd, tmp, sudo_user, sudoable=sudoable)
+        rc, stdin, stdout, stderr = conn.exec_command(cmd, tmp, sudo_user, sudoable=sudoable)
 
         if type(stdout) not in [ str, unicode ]:
-            out = "\n".join(stdout.readlines())
+            out = ''.join(stdout.readlines())
         else:
             out = stdout
 
         if type(stderr) not in [ str, unicode ]:
-            err = "\n".join(stderr.readlines())
+            err = ''.join(stderr.readlines())
         else:
             err = stderr
 
-        return out + err
+        if rc != None:
+            return dict(rc=rc, stdout=out, stderr=err )
+        else:
+            return dict(stdout=out, stderr=err )
 
     # *****************************************************
 
@@ -474,7 +477,7 @@ class Runner(object):
         cmd = " || ".join(md5s)
         cmd = "%s; %s || (echo \"${rc}  %s\")" % (test, cmd, path)
         data = self._low_level_exec_command(conn, cmd, tmp, sudoable=False)
-        data2 = utils.last_non_blank_line(data)
+        data2 = utils.last_non_blank_line(data['stdout'])
         try:
             return data2.split()[0]
         except IndexError:
@@ -502,7 +505,7 @@ class Runner(object):
         cmd += ' && echo %s' % basetmp
 
         result = self._low_level_exec_command(conn, cmd, None, sudoable=False)
-        rc = utils.last_non_blank_line(result).strip() + '/'
+        rc = utils.last_non_blank_line(result['stdout']).strip() + '/'
         return rc
 
 

lib/ansible/runner/action_plugins/raw.py

@@ -34,7 +34,7 @@ class ActionModule(object):
         self.runner = runner
 
     def run(self, conn, tmp, module_name, module_args, inject):
-        return ReturnData(conn=conn, result=dict(
-            stdout=self.runner._low_level_exec_command(conn, module_args.encode('utf-8'), tmp, sudoable=True)
-        ))
+        return ReturnData(conn=conn,
+            result=self.runner._low_level_exec_command(conn, module_args.encode('utf-8'), tmp, sudoable=True)
+        )
 

lib/ansible/runner/connection_plugins/fireball.py

@@ -88,7 +88,7 @@ class Connection(object):
         response = utils.decrypt(self.key, response)
         response = utils.parse_json(response)
 
-        return ('', response.get('stdout',''), response.get('stderr',''))
+        return (response.get('rc',None), '', response.get('stdout',''), response.get('stderr',''))
 
     def put_file(self, in_path, out_path):
 

lib/ansible/runner/connection_plugins/local.py

@@ -52,7 +52,7 @@ class Connection(object):
         p = subprocess.Popen(cmd, cwd=basedir, shell=True, stdin=None,
                              stdout=subprocess.PIPE, stderr=subprocess.PIPE)
         stdout, stderr = p.communicate()
-        return ("", stdout, stderr)
+        return (p.returncode, '', stdout, stderr)
 
     def put_file(self, in_path, out_path):
         ''' transfer a file from local to local '''

lib/ansible/runner/connection_plugins/paramiko_ssh.py

@@ -145,7 +145,7 @@ class Connection(object):
             except socket.timeout:
                 raise errors.AnsibleError('ssh timed out waiting for sudo.\n' + sudo_output)
 
-        return (chan.makefile('wb', bufsize), chan.makefile('rb', bufsize), '')
+        return (chan.recv_exit_status(), chan.makefile('wb', bufsize), chan.makefile('rb', bufsize), chan.makefile_stderr('rb', bufsize))
 
     def put_file(self, in_path, out_path):
         ''' transfer a file from local to remote '''

lib/ansible/runner/connection_plugins/ssh.py

@@ -108,11 +108,11 @@ class Connection(object):
             import pty
             master, slave = pty.openpty()
             p = subprocess.Popen(ssh_cmd, stdin=slave,
-                                 stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
+                                 stdout=subprocess.PIPE, stderr=subprocess.PIPE)
             stdin = os.fdopen(master, 'w', 0)
         except:
             p = subprocess.Popen(ssh_cmd, stdin=subprocess.PIPE,
-                                 stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
+                                 stdout=subprocess.PIPE, stderr=subprocess.PIPE)
             stdin = p.stdin
 
         self._send_password()
@@ -137,22 +137,29 @@ class Connection(object):
 
         # We can't use p.communicate here because the ControlMaster may have stdout open as well
         stdout = ''
+        stderr = ''
         while True:
-            rfd, wfd, efd = select.select([p.stdout], [], [p.stdout], 1)
+            rfd, wfd, efd = select.select([p.stdout, p.stderr], [], [p.stdout, p.stderr], 1)
             if p.stdout in rfd:
                 dat = os.read(p.stdout.fileno(), 9000)
                 stdout += dat
                 if dat == '':
                     p.wait()
                     break
+            elif p.stderr in rfd:
+                dat = os.read(p.stderr.fileno(), 9000)
+                stderr += dat
+                if dat == '':
+                    p.wait()
+                    break
             elif p.poll() is not None:
                 break
         stdin.close() # close stdin after we read from stdout (see also issue #848)
 
-        if p.returncode != 0 and stdout.find('Bad configuration option: ControlPersist') != -1:
+        if p.returncode != 0 and stderr.find('Bad configuration option: ControlPersist') != -1:
             raise errors.AnsibleError('using -c ssh on certain older ssh versions may not support ControlPersist, set ANSIBLE_SSH_ARGS="" (or ansible_ssh_args in the config file) before running again')
 
-        return ('', stdout, '')
+        return (p.returncode, '', stdout, stderr)
 
     def put_file(self, in_path, out_path):
         ''' transfer a file from local to remote '''

library/fireball

@@ -159,7 +159,7 @@ def command(data):
         stderr = ''
     log("got stdout: %s" % stdout)
 
-    return dict(stdout=stdout, stderr=stderr)
+    return dict(rc=p.returncode, stdout=stdout, stderr=stderr)
 
 def fetch(data):
     if 'in_path' not in data:

library/raw

@@ -13,11 +13,11 @@ description:
        all core modules require it. Another is speaking to any devices such as
        routers that do not have any Python installed. In any other case, using
        the M(shell) or M(command) module is much more appropriate. Arguments
-       given to M(raw) are run directly through the configured remote shell and
-       only output is returned. There is no error detection or change handler
-       support for this module
+       given to M(raw) are run directly through the configured remote shell.
+       Standard output, error output and return code are returned when
+       available. There is no change handler support for this module.
 examples:
-    - code: ansible newhost.example.com -m raw -a "yum -y install python-simplejson"
-      description: Example from C(/usr/bin/ansible) to bootstrap a legacy python 2.4 host
+    - description: Example from C(/usr/bin/ansible) to bootstrap a legacy python 2.4 host
+      code: ansible newhost.example.com -m raw -a "yum -y install python-simplejson"
 author: Michael DeHaan
 '''