[sonic-cfggen]: Move get_machine_info function to sonic_platform.py (#489)

* Move get_machine_info to lib
* Add get platform info API
* Create sonic_platform.py

Signed-off-by: Sihui Han <sihan@microsoft.com>

src/sonic-config-engine/minigraph.py

@@ -47,7 +47,6 @@ class minigraph_encoder(json.JSONEncoder):
             return str(obj)
         return json.JSONEncoder.default(self, obj)
 
-
 def parse_png(png, hname):
     neighbors = {}
     devices = {}

src/sonic-config-engine/setup.py

@@ -15,7 +15,7 @@ setup(name='sonic-config-engine',
       author='Taoyu Li',
       author_email='taoyl@microsoft.com',
       url='https://github.com/Azure/sonic-buildimage',
-      py_modules=['minigraph', 'openconfig_acl'],
+      py_modules=['minigraph', 'openconfig_acl', 'sonic_platform'],
       scripts=['sonic-cfggen', 'translate_acl'],
       install_requires=['lxml', 'jinja2', 'netaddr', 'ipaddr', 'pyyaml', 'pyangbind'],
       test_suite='setup.get_test_suite',

src/sonic-config-engine/sonic-cfggen

@@ -7,9 +7,10 @@ import yaml
 import jinja2
 import netaddr
 import json
-from minigraph import parse_xml
 from minigraph import minigraph_encoder
-
+from minigraph import parse_xml
+from sonic_platform import get_machine_info
+from sonic_platform import get_platform_info
 
 def is_ipv4(value):
     if not value:
@@ -44,19 +45,6 @@ def unique_name(l):
             new_list.append(item)
     return new_list
 
-def get_machine_info():
-    if not os.path.isfile('/host/machine.conf'):
-        return None
-    machine_vars = {}
-    with open('/host/machine.conf') as machine_file:
-        for line in machine_file:
-            tokens = line.split('=')
-            if len(tokens) < 2:
-                continue
-            machine_vars[tokens[0]] = tokens[1].strip()
-    return machine_vars    
-
-
 def main():
     parser=argparse.ArgumentParser(description="Render configuration file from minigraph data and jinja2 template.")
     parser.add_argument("-m", "--minigraph", help="minigraph xml file")
@@ -74,10 +62,9 @@ def main():
     machine_info = get_machine_info()
     if machine_info != None:
         data.update(machine_info)
-        if machine_info.has_key('onie_platform'):
-            data['platform'] = machine_info['onie_platform']
-        elif machine_info.has_key('aboot_platform'):
-            data['platform'] = machine_info['aboot_platform']
+        platform_info = get_platform_info(machine_info)
+        if platform_info != None:
+            data['platform'] = platform_info
 
     if args.minigraph != None:
         minigraph = args.minigraph

src/sonic-config-engine/sonic_platform.py

@@ -0,0 +1,32 @@
+#!/usr/bin/env python
+import os
+
+DOCUMENTATION = '''
+---
+module: sonic_platform
+version_added: "1.9"
+short_description: Retrive platform related facts for a device.
+description:
+    - Retrieve platform related facts from config files.
+'''
+
+def get_machine_info():
+    if not os.path.isfile('/host/machine.conf'):
+        return None
+    machine_vars = {}
+    with open('/host/machine.conf') as machine_file:
+        for line in machine_file:
+            tokens = line.split('=')
+            if len(tokens) < 2:
+                continue
+            machine_vars[tokens[0]] = tokens[1].strip()
+    return machine_vars
+
+def get_platform_info(machine_info):
+    if machine_info != None:
+        if machine_info.has_key('onie_platform'):
+            return  machine_info['onie_platform']
+        elif machine_info.has_key('aboot_platform'):
+            return machine_info['aboot_platform']
+    return None
+