Add a vSphere folder in CFME 4.2+

cfme_vsphere_create_folder.rb

# require rbvmomi, should be installed already because it is used by CFME
require 'rbvmomi'

# todo: input options/dialog values/etc
data_center = "RHC-DC-VMware"
folder_path = "test_folder/test_folder/test_folder2"

# todo: possibly validate to make sure folder_path doesn't start with '/' and/or if it does remove it

# determine full path .. the "vm" is because it is a vm folder
data_center_folder_path = "#{data_center}/vm/#{folder_path}"
full_folder_path = "data_centers/#{data_center_folder_path}"

# get EMS object
ems = nil

# get ems, could add other sources (event, host, vm, etc) to get or try and get a list of providers if we wanted to
if $evm.root['ext_management_system'].present?
    # get ems from root
    ems = $evm.root['ext_management_system']
else
    # error out
    return MIQ_STOP
end

# log found EMS
$evm.log("info", "Found EMS: #{ems.name}")

# create folder by default
create_folder = true
# get folders from ems, there may be an easier way to find/index the existing folders but this should be fast enough
ems.ems_folders.each do |folder|
    # if a folder path is present then analyze against chosen path
    existing_folder_path = folder.folder_path
    if existing_folder_path.present?
        $evm.log("info", "Found existing data_center/folder path: '#{existing_folder_path}'")
        # if the folder path that was chosen
        # equals the existing folder path
        # then break and signal that we don't
        # need to create the folder
        if full_folder_path == existing_folder_path
            create_folder = false
            break
        end # folder path is equal to existing path
    end # folder path is not nil
end # for-each folder path

# create folder logic
if create_folder
    # connect to vCenter
    $evm.log("info", "Connecting to vCenter: '#{ems.hostname}' with user '#{ems.authentication_userid}'")
    vim = RbVmomi::VIM.connect(host: ems.hostname, user: ems.authentication_userid, password: ems.authentication_password, insecure: true)

    # traverse to/create folder path
    $evm.log("info", "Creating path: '#{folder_path}' in DC '#{data_center}'")

    # using this we traverse into the DC's and get one from the data center option
    dc = vim.serviceInstance.content.rootFolder.traverse(data_center, RbVmomi::VIM::Datacenter)
    unless dc.present?
        # close connection
        vim.close
        # log error and abort
        $evm.log("error", "No data_center named '#{data_center}' found in EMS #{ems.name} (or on host #{ems.hostname}, abort")
        return MIQ_ABORT
    end

    # use the traverse! method which auto-creates resources that aren't there with the object type it should create (folder)
    dc.vmFolder.traverse!(folder_path, RbVmomi::VIM::Folder)

    # close connection
    $evm.log("info", "Closed vCenter connection: '#{ems.hostname}'")
    vim.close
else    
    $evm.log("info", "Folder '#{data_center_folder_path}' already exists")
end

Another style comment, typically in ruby we don't use camelCase, such as with variables createFolder, dataCenterFolderPath, etc. They are done as snake case, so create_folder and data_center_folder_path