apt_137.out

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126C0D24BD8A2942CC7DF8AC7638D0442B90D010|0X1C4CBDCDCD2EFD2A|false
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9FED2BCBDCD29CDF762678CBAED4B06F473041FA|0X1C4CBDCDCD2EFD2A|false
0E4EDE2C7F3E1FC0D033800E64481591B98321F9|0X1C4CBDCDCD2EFD2A|false
A1BD8E9D78F7FE5C3E65D8AF8B48AD6246925553|0X1C4CBDCDCD2EFD2A|false
ED6D65271AACF0FF15D123036FB2A1C265FFB764|0X1C4CBDCDCD2EFD2A|false
9DBB0BE9366964F134855E2255F96FCF8231B6DD|0X1C4CBDCDCD2EFD2A|false

apt_137.rb

#!/usr/bin/env ruby

require 'mixlib/shellout'


def extract_fingerprints_from_cmd(cmd)
  so = Mixlib::ShellOut.new(cmd, env: { 'LANG' => 'en_US', 'LANGUAGE' => 'en_US' })
  so.run_command
  so.stdout.split(/\n/).map do |t|
    if z = t.match(/^ +Key fingerprint = ([0-9A-F ]+)/)
      z[1].split.join
    end
  end.compact
end

key = '0x1C4CBDCDCD2EFD2A'

key_present = extract_fingerprints_from_cmd('apt-key finger').any? do |fingerprint|
  puts "#{fingerprint}|#{key.upcase}|#{fingerprint.end_with?(key.upcase)}"
  fingerprint.end_with?(key.upcase)
end