JNUC2019 Lab Session E Quick Report

Hands On, Real-time Classic API Using ruby-jss

Lab Session Contents - 4 - A Quick Report

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• The Jamf Pro UI can automate the generation of some reports.

• But occasionally you'll want something a bit more complex

• For example, A report of device name, serial, and username for all iPads that are managed & supervised, whose users also have a managed Mac laptop.

• first we need a list of all the managed laptops

mgd_laptops = JSS::Computer.all_laptops.select { |macinfo| macinfo[:managed] } ;0
# => 0

• Use the all_laptops method to get the list of laptops

• But we only want the managed ones, so we use another iterator select to filter them out.

  • Like each select loops thru and passes each hash into a block of code.
  • select remembers the ones where the block evaluated to true
  • our code block look at the :managed value in each Hash, which is true or false
  • select then returns a new array, with only the hashes that were 'true'

• and we store that in the variable mdg_laptops to use later.

• Lets look at the contents of mdg_laptops and how many laptops it contains:

pp mgd_laptops ;0
# [array of hashes]
# =>0

mgd_laptops.size
# => 85

• But we really want an array of usernames, not an array of hashes, so:

mgd_laptop_users = mgd_laptops.map { |macinfo| macinfo[:username] }  ;0
# => 0

• Here we're using yet another iterator: map

  • This loops thru the Array, building a new Array with the value calculated in the code block
  • map then returns the new array
  • Our code block is just extracting the :username value from each Hash

• We get an Array of usernames, which we store in the var. mgd_laptop_users to use later

• here it is:

pp mgd_laptop_users ;0
# [array of usernames]
# => 0

• Now its time to get our list of iPads, we need all the ones that are managed and supervised

mgd_supd_ipads = JSS::MobileDevice.all_ipads.select { |ipad| ipad[:managed] && ipad[:supervised] } ;0
# => 0

• We use select again, on the Array of all_ipads to get the ones that are both managed and supervised

• saving them in the var. mgd_supd_ipads

• Now that we've gathered the data we need, lets print our report

mgd_supd_ipads.each do |ipad|
  next unless mgd_laptop_users.include? ipad[:username]
  puts "iPad: '#{ipad[:name]}' SN: '#{ipad[:serial_number]}' User: '#{ipad[:username]}' has a managed Mac laptop"
end ;0
# [lines of output]
# => 0

• Use each to loop through our managed, supervised ipads

• Use next to skip the ipad unless its user's name is in the array of laptop usernames we saved above

  • Arrays have a method include? that returns true or false

• and then we print a line of output

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