Fixing serial number read to get from DB if it is populated (sonic-ne…

…t#1580)

#### What I did
Modified show version command to pick serial number from STATE_DB if it was populated instead of getting it from EEPROM.

#### How I did it
Check state_db to see if serial number EEPROM section is populated. If yes use the data from DB. If not, read it from the decode-syseeprom

show/main.py

@@ -960,8 +960,15 @@ def version(verbose):
  asic_type = version_info['asic_type']
  asic_count = multi_asic.get_num_asics()
 
- serial_number_cmd = "sudo decode-syseeprom -s"
- serial_number = subprocess.Popen(serial_number_cmd, shell=True, text=True, stdout=subprocess.PIPE)
+ serial_number = None
+ db = SonicV2Connector()
+ db.connect(db.STATE_DB)
+ eeprom_table = db.get_all(db.STATE_DB, 'EEPROM_INFO|0x23')
+ if "Name" in eeprom_table and eeprom_table["Name"] == "Serial Number" and "Value" in eeprom_table:
+ serial_number = eeprom_table["Value"]
+ else:
+ serial_number_cmd = "sudo decode-syseeprom -s"
+ serial_number = subprocess.Popen(serial_number_cmd, shell=True, text=True, stdout=subprocess.PIPE).stdout.read()
 
  sys_uptime_cmd = "uptime"
  sys_uptime = subprocess.Popen(sys_uptime_cmd, shell=True, text=True, stdout=subprocess.PIPE)
@@ -976,7 +983,7 @@ def version(verbose):
  click.echo("HwSKU: {}".format(hwsku))
  click.echo("ASIC: {}".format(asic_type))
  click.echo("ASIC Count: {}".format(asic_count))
- click.echo("Serial Number: {}".format(serial_number.stdout.read().strip()))
+ click.echo("Serial Number: {}".format(serial_number.strip()))
  click.echo("Uptime: {}".format(sys_uptime.stdout.read().strip()))
  click.echo("\nDocker images:")
  cmd = 'sudo docker images --format "table {{.Repository}}\\t{{.Tag}}\\t{{.ID}}\\t{{.Size}}"'