Get service module working with sudo, add list=status, better error messages.

When running the service module via sudo, `$PATH` didn't contain `/sbin`,
so the service binary couldn't be found.  This just runs `/sbin/service`
directly.  Output is spewed to stderr on error.

Added `list=status` to include the output of `service <cmd> status`.

library/service

@@ -21,13 +21,22 @@ try:
     import json
 except ImportError:
     import simplejson as json
-import os
 import sys
 import shlex
 import subprocess
 
 # ===========================================
 
+SERVICE = '/sbin/service'
+
+def _run(cmd):
+    ''' :Return: A tuple of ``(returncode, stdout, stderr)`` resulting from executing
+    `cmd` with the shell. '''
+    process = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True)
+    stdout, stderr = process.communicate()
+    return (process.returncode, stdout, stderr) 
+
+
 argfile = sys.argv[1]
 args = open(argfile, 'r').read()
 items = shlex.split(args)
@@ -46,26 +55,31 @@ for arg in items:
 
 name = params['name']
 state = params.get('state','unknown')
+list_ = params.get('list')
 
 # running and started are the same
 if state not in [ 'running', 'started', 'stopped', 'restarted' ]:
     print json.dumps(dict(failed=True, msg='invalid state'))
     sys.exit(1)
+if list_ and list_ not in ('status',):
+    print json.dumps(dict(failed=True, msg='invalid argument to list'))
+    sys.exit(1)
+    
 
 # ===========================================
 # get service status
 
-status = os.popen("service %s status" % name).read()
+rc, stdout, stderr = _run("%s %s status" % (SERVICE, name))
 
 # ===========================================
 # determine if we are going to change anything
 
 running = False
-if status.find("not running") != -1:
+if stdout.find("not running") != -1:
     running = False
-elif status.find("running") != -1:
+elif stdout.find("running") != -1:
     running = True
-elif name == 'iptables' and status.find("ACCEPT") != -1:
+elif name == 'iptables' and stdout.find("ACCEPT") != -1:
     # iptables status command output is lame
     # TODO: lookup if we can use a return code for this instead?
     running = True
@@ -81,32 +95,37 @@ elif state == "restarted":
 # ===========================================
 # run change commands if we need to
 
-def _run(cmd):
-    return subprocess.call(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True)
 
 rc = 0
 if changed:
     if state in ('started', 'running'):
-        rc = _run("service %s start" %  name)
+        rc, stdout, stderr = _run("%s %s start" % (SERVICE, name))
     elif state == 'stopped':
-        rc = _run("service %s stop" % name)
+        rc, stdout, stderr = _run("%s %s stop" % (SERVICE, name))
     elif state == 'restarted':
-        rc1 = _run("service %s stop" % name)
-        rc2 = _run("service %s start" % name)
-        rc  = rc1 and rc2
+        rc1, stdout1, stderr1 = _run("%s %s stop" % (SERVICE, name))
+        rc2, stdout2, stderr2 = _run("%s %s start" % (SERVICE, name))
+        rc = rc1 and rc2
+        stdout = stdout1 + stdout2
+        stderr = stderr1 + stderr2
 
 if rc != 0:
-    # yeah, should probably include output of failure...
     print json.dumps({
         "failed" : 1,
-        "rc"     : rc
+        "rc"     : rc,
     })
+    print >> sys.stderr, stdout + stderr
     sys.exit(1)
 
+
 # ===============================================
 # success
 
-print json.dumps({
-   "changed" : changed
-})
+result = {"changed": changed}
+
+if list_ == 'status':
+    rc, stdout, stderr = _run("%s %s status" % (SERVICE, name))
+    result['status'] = stdout
+    
+print json.dumps(result)