RFC: Generate unique uuid for platforms

[jquick]

Description

Generate a unique identifier for platforms that can be used to see if your hitting the same box over multiple runs. See if we already have a uuid on the box (via chef client or something else) else create one based on the criteria below.

Unix

• cat /etc/machine-id || /var/lib/dbus/machine-id || /var/db/dbus/machine-id if valid
• create uuids like:

      hash = Digest::SHA1.new
      hash.update(string)
      ary = hash.digest.unpack("NnnnnN")
      ary[2] = (ary[2] & 0x0FFF) | (5 << 12)
      ary[3] = (ary[3] & 0x3FFF) | 0x8000
      "%08x-%04x-%04x-%04x-%04x%08x" % ary

taken from https://github.com/rails/rails/blob/a9dc45459abcd9437085f4dd0aa3c9d0e64e062f/activesupport/lib/active_support/core_ext/digest/uuid.rb#L16

• We could write a uuid to the disk if none exist. /etc/machine-uuid or local if that is not possible

OSX

hardware uuid system_profiler SPHardwareDataType | awk '/UUID/ { print $3; }'

Windows

wmic csproduct get UUID
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Cryptography\MachineGuid in the registry

• We could write a uuid to the disk if none exist.

AWS API

Use the account_id

Azure

Use subscription_id, fallback to tenant_id