[show] Eliminate need for writing template files for 'show platform summary' and 'show version' (sonic-net#335)

- Eliminate the need to write template files to disk in both "show platform summary" and "show version"
- Now catching exception if we cannot retrieve HwSKU from ConfigDB and display "Unknown" as result

Author: jleveque

show/main.py

@@ -1,16 +1,18 @@
 #! /usr/bin/python -u
 
-import click
 import errno
-import getpass
 import json
 import os
 import re
 import subprocess
 import sys
+
+import click
 from click_default_group import DefaultGroup
 from natsort import natsorted
 from tabulate import tabulate
+
+import sonic_platform
 from swsssdk import ConfigDBConnector
 from swsssdk import SonicV2Connector
 
@@ -878,25 +880,24 @@ def platform():
 @platform.command()
 def summary():
     """Show hardware platform information"""
-    username = getpass.getuser()
+    machine_info = sonic_platform.get_machine_info()
+    platform = sonic_platform.get_platform_info(machine_info)
 
-    PLATFORM_TEMPLATE_FILE = "/tmp/cli_platform_{0}.j2".format(username)
-    PLATFORM_TEMPLATE_CONTENTS = "Platform: {{ DEVICE_METADATA.localhost.platform }}\n" \
-                                 "HwSKU: {{ DEVICE_METADATA.localhost.hwsku }}\n" \
-                                 "ASIC: {{ asic_type }}"
-
-    # Create a temporary Jinja2 template file to use with sonic-cfggen
-    f = open(PLATFORM_TEMPLATE_FILE, 'w')
-    f.write(PLATFORM_TEMPLATE_CONTENTS)
-    f.close()
+    config_db = ConfigDBConnector()
+    config_db.connect()
+    data = config_db.get_table('DEVICE_METADATA')
 
-    cmd = "sonic-cfggen -d -y /etc/sonic/sonic_version.yml -t {0}".format(PLATFORM_TEMPLATE_FILE)
-    p = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE)
-    click.echo(p.stdout.read())
+    try:
+        hwsku = data['localhost']['hwsku']
+    except KeyError:
+        hwsku = "Unknown"
 
-    # Clean up
-    os.remove(PLATFORM_TEMPLATE_FILE)
+    version_info = sonic_platform.get_sonic_version_info()
+    asic_type = version_info['asic_type']
 
+    click.echo("Platform: {}".format(platform))
+    click.echo("HwSKU: {}".format(hwsku))
+    click.echo("ASIC: {}".format(asic_type))
 
 # 'syseeprom' subcommand ("show platform syseeprom")
 @platform.command()
@@ -955,33 +956,20 @@ def logging(process, lines, follow, verbose):
 @cli.command()
 def version():
     """Show version information"""
-    username = getpass.getuser()
-
-    VERSION_TEMPLATE_FILE = "/tmp/cli_version_{0}.j2".format(username)
-    VERSION_TEMPLATE_CONTENTS = "SONiC Software Version: SONiC.{{ build_version }}\n" \
-                                "Distribution: Debian {{ debian_version }}\n" \
-                                "Kernel: {{ kernel_version }}\n" \
-                                "Build commit: {{ commit_id }}\n" \
-                                "Build date: {{ build_date }}\n" \
-                                "Built by: {{ built_by }}"
-
-    # Create a temporary Jinja2 template file to use with sonic-cfggen
-    f = open(VERSION_TEMPLATE_FILE, 'w')
-    f.write(VERSION_TEMPLATE_CONTENTS)
-    f.close()
-
-    cmd = "sonic-cfggen -y /etc/sonic/sonic_version.yml -t {0}".format(VERSION_TEMPLATE_FILE)
-    p = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE)
-    click.echo(p.stdout.read())
+    version_info = sonic_platform.get_sonic_version_info()
+
+    click.echo("SONiC Software Version: SONiC.{}".format(version_info['build_version']))
+    click.echo("Distribution: Debian {}".format(version_info['debian_version']))
+    click.echo("Kernel: {}".format(version_info['kernel_version']))
+    click.echo("Build commit: {}".format(version_info['commit_id']))
+    click.echo("Build date: {}".format(version_info['build_date']))
+    click.echo("Built by: {}".format(version_info['built_by']))
 
-    click.echo("Docker images:")
+    click.echo("\nDocker images:")
     cmd = 'sudo docker images --format "table {{.Repository}}\\t{{.Tag}}\\t{{.ID}}\\t{{.Size}}"'
     p = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE)
     click.echo(p.stdout.read())
 
-    # Clean up
-    os.remove(VERSION_TEMPLATE_FILE)
-
 #
 # 'environment' command ("show environment")
 #