check_esxi_hardware 20221230 released: Bugfix when no Serial Number detected (NoneType)

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A new version of check_esxi_hardware, an open source monitoring plugin to monitor the hardware of VMware ESXi servers, is available.

The newest release (20221230) fixes a bug (issue #68), when a (Chassis) Serial Number is not detected from the parsed CIM elements. I came across this bug when testing plugin compatibility with a new VMware ESXi 8 installed as a virtual machine.

$ ./ -H esxiserver -U root -P password
Traceback (most recent call last):
  File "./", line 1070, in <module>
    print("OK - Server: %s %s %s%s" % (server_info, 's/n: ' + SerialNumber, bios_info, perf))
TypeError: can only concatenate str (not "NoneType") to str

The (Python) problem? The script tries to combine (concatenate) a variable "SerialNumber" with a string "s/n". But as there was no SerialNumber found from the CIM output, this variable is empty and is seen as "NoneType" by Python.

In version 20221230 the "s/n" string is now a fixed part of the output and will either contain a retrieved serial number or "None".

$ ./ -H esxiserver -U root -P password
OK - Server: QEMU Standard PC (Q35 + ICH9, 2009) s/n: None System BIOS: 1.12.0-1 2014-04-01

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