Development repository for Chef Cookbook windows
tas50 Release 5.1.3
Signed-off-by: Tim Smith <tsmith@chef.io>
Latest commit 7c9afb2 Oct 11, 2018

README.md

Windows Cookbook

Build status Cookbook Version

Provides a set of Windows-specific resources to aid in the creation of cookbooks/recipes targeting the Windows platform.

Requirements

Platforms

  • Windows 7
  • Windows Server 2008 R2
  • Windows 8, 8.1
  • Windows Server 2012 (R1, R2)
  • Windows Server 2016

Chef

  • Chef 13.4+

Resources

Deprecated Resources Note

As of Chef Client 14+ the auto_run, feature, feature_dism, feature_powershell, font, pagefile, printer_port, printer, and shortcut resources are now included in the Chef Client. If you are running Chef 14+ the resources in Chef client will take precedence over the resources in this cookbook. In April 2019 we will release a new major version of this cookbook that removes these resources.

windows_auto_run

Note: This resource is now included in Chef 14 and later. There is no need to depend on the Windows cookbook for this resource.

Actions

  • :create - Create an item to be run at login
  • :remove - Remove an item that was previously setup to run at login

Properties

  • program_name - Name property. The name of the value to be stored in the registry
  • path - The program to be run at login. This property was previous named program. Cookbooks using the program property will continue to function, but should be updated.
  • args - The arguments for the program
  • root - The registry root key to put the entry under--:machine (default) or :user

Examples

Run BGInfo at login

windows_auto_run 'BGINFO' do
  program 'C:/Sysinternals/bginfo.exe'
  args    '\'C:/Sysinternals/Config.bgi\' /NOLICPROMPT /TIMER:0'
  action  :create
end

windows_certificate

Installs a certificate into the Windows certificate store from a file, and grants read-only access to the private key for designated accounts. Due to current limitations in WinRM, installing certificated remotely may not work if the operation requires a user profile. Operations on the local machine store should still work.

Actions

  • :create - creates or updates a certificate.
  • :delete - deletes a certificate.
  • :acl_add - adds read-only entries to a certificate's private key ACL.

Properties

  • source - name attribute. The source file (for create and acl_add), thumbprint (for delete and acl_add) or subject (for delete).
  • pfx_password - the password to access the source if it is a pfx file.
  • private_key_acl - array of 'domain\account' entries to be granted read-only access to the certificate's private key. This is not idempotent.
  • store_name - the certificate store to manipulate. One of:
    • MY (Personal)
    • CA (Intermediate Certification Authorities)
    • ROOT (Trusted Root Certification Authorities)
    • TRUSTEDPUBLISHER (Trusted Publishers)
    • CLIENTAUTHISSUER (Client Authentication Issuers)
    • REMOTE DESKTOP (Remote Desktop)
    • TRUSTEDDEVICES (Trusted Devices)
    • WEBHOSTING (Web Hosting)
    • AUTHROOT (Third-Party Root Certification Authorities)
    • TRUSTEDPEOPLE (Trusted People)
    • SMARTCARDROOT (Smart Card Trusted Roots)
    • TRUST (Enterprise Trust)
    • DISALLOWED (Untrusted Certificates)
  • user_store - if false (default) then use the local machine store; if true then use the current user's store.

Examples

# Add PFX cert to local machine personal store and grant accounts read-only access to private key
windows_certificate "c:/test/mycert.pfx" do
    pfx_password    "password"
    private_key_acl    ["acme\fred", "pc\jane"]
end
# Add cert to trusted intermediate store
windows_certificate "c:/test/mycert.cer" do
    store_name    "CA"
end
# Remove all certificates matching the subject
windows_certificate "me.acme.com" do
    action :delete
end

windows_certificate_binding

Binds a certificate to an HTTP port in order to enable TLS communication.

Actions

  • :create - creates or updates a binding.
  • :delete - deletes a binding.

Properties

  • cert_name - name attribute. The thumbprint(hash) or subject that identifies the certificate to be bound.
  • name_kind - indicates the type of cert_name. One of :subject (default) or :hash.
  • address - the address to bind against. Default is 0.0.0.0 (all IP addresses). One of:
    • IP v4 address 1.2.3.4
    • IP v6 address [::1]
    • Host name www.foo.com
  • port - the port to bind against. Default is 443.
  • app_id - the GUID that defines the application that owns the binding. Default is the values used by IIS.
  • store_name - the store to locate the certificate in. One of:
    • MY (Personal)
    • CA (Intermediate Certification Authorities)
    • ROOT (Trusted Root Certification Authorities)
    • TRUSTEDPUBLISHER (Trusted Publishers)
    • CLIENTAUTHISSUER (Client Authentication Issuers)
    • REMOTE DESKTOP (Remote Desktop)
    • TRUSTEDDEVICES (Trusted Devices)
    • WEBHOSTING (Web Hosting)
    • AUTHROOT (Third-Party Root Certification Authorities)
    • TRUSTEDPEOPLE (Trusted People)
    • SMARTCARDROOT (Smart Card Trusted Roots)
    • TRUST (Enterprise Trust)

Examples

# Bind the first certificate matching the subject to the default TLS port
windows_certificate_binding "me.acme.com" do
end
# Bind a cert from the CA store with the given hash to port 4334
windows_certificate_binding "me.acme.com" do
    cert_name    "d234567890a23f567c901e345bc8901d34567890"
    name_kind    :hash
    store_name    "CA"
    port        4334
end

windows_dns

Configures A and CNAME records in Windows DNS. This requires the DNSCMD to be installed, which is done by adding the DNS role to the server or installing the Remote Server Admin Tools.

Actions

  • :create: creates/updates the DNS entry
  • :delete: deletes the DNS entry

Properties

  • host_name: name attribute. FQDN of the entry to act on.
  • dns_server: the DNS server to update. Default is local machine (.)
  • record_type: the type of record to create. One of A (default) or CNAME
  • target: for A records an array of IP addresses to associate with the host; for CNAME records the FQDN of the host to alias
  • ttl: if > 0 then set the time to live of the record

Examples

# Create A record linked to 2 addresses with a 10 minute ttl
windows_dns "m1.chef.test" do
    target         ['10.9.8.7', '1.2.3.4']
    ttl            600
end
# Delete records. target is mandatory although not used
windows_dns "m1.chef.test" do
    action    :delete
    target    []
end
# Set an alias against the node in a role
nodes = search( :node, "role:my_service" )
windows_dns "myservice.chef.test" do
    record_type    'CNAME'
    target        nodes[0]['fqdn']
end

windows_feature

Note: This resource is now included in Chef 14 and later. There is no need to depend on the Windows cookbook for this resource.

BREAKING CHANGE - Version 3.0.0

This resource has been moved from using LWRPs and multiple providers to using Custom Resources. To maintain functionality, you'll need to change provider to install_method.

Windows Roles and Features can be thought of as built-in operating system packages that ship with the OS. A server role is a set of software programs that, when they are installed and properly configured, lets a computer perform a specific function for multiple users or other computers within a network. A Role can have multiple Role Services that provide functionality to the Role. Role services are software programs that provide the functionality of a role. Features are software programs that, although they are not directly parts of roles, can support or augment the functionality of one or more roles, or improve the functionality of the server, regardless of which roles are installed. Collectively we refer to all of these attributes as 'features'.

This resource allows you to manage these 'features' in an unattended, idempotent way.

There are two underlying resources that power windows_feature which map to the available installation systems on supported releases of Windows: Deployment Image Servicing and Management (DISM) and PowerShell. Chef will set the default method to :windows_feature_dism if dism.exe is present on the system being configured and otherwise use :windows_feature_powershell.

For more information on Roles, Role Services and Features see the Microsoft TechNet article on the topic. For a complete list of all features that are available on a node type either of the following commands at a command prompt:

For Dism:

dism /online /Get-Features

For PowerShell:

get-windowsfeature

Actions

  • :install - install a Windows role/feature
  • :remove - remove a Windows role/feature
  • :delete - remove a Windows role/feature from the image

Properties

  • feature_name - name of the feature/role(s) to install. The same feature may have different names depending on the underlying resource being used (ie DHCPServer vs DHCP; DNS-Server-Full-Role vs DNS).
  • all - Boolean. Optional. Default: false. For DISM this is the equivalent of specifying the /All switch to dism.exe, forcing all parent dependencies to be installed. With the PowerShell install method, the -InstallAllSubFeatures switch is applied. Note that these two methods may not produce identical results.
  • management_tools - Boolean. Optional. Default: false. PowerShell only. Includes the -IncludeManagementTools switch. Installs all applicable management tools of the roles, role services, or features specified by the feature name.
  • source - String. Optional. Uses local repository for feature install.
  • timeout - Integer. Optional. Default: 600. Specifies a timeout (in seconds) for feature install.
  • install_method - Symbol. Optional. If not supplied, Chef will determine which method to use (in the order of :windows_feature_dism, :windows_feature_servercmd, :windows_feature_powershell)

Examples

Install the DHCP Server feature

windows_feature 'DHCPServer' do
  action :install
end

Install the .Net 3.5.1 feature on Server 2012 using repository files on DVD and install all dependencies with a timeout of 900 seconds

windows_feature "NetFx3" do
  action :install
  all true
  source "d:\sources\sxs"
  timeout 900
end

Remove Telnet Server and Client features

windows_feature ['TelnetServer', 'TelnetClient'] do
  action :remove
end

Add the SMTP Server feature using the PowerShell provider

windows_feature "smtp-server" do
  action :install
  all true
  install_method :windows_feature_powershell
end

Install multiple features using one resource with the PowerShell provider

windows_feature ['Web-Asp-Net45', 'Web-Net-Ext45'] do
  action :install
  install_method :windows_feature_powershell
end

Install the Network Policy and Access Service feature, including the management tools. Which, for this example, will automatically install RSAT-NPAS as well.

windows_feature 'NPAS' do
  action :install
  management_tools true
  install_method :windows_feature_powershell
end

windows_font

Note: This resource is now included in Chef 14 and later. There is no need to depend on the Windows cookbook for this resource.

Installs font files. Sources the font by default from the cookbook, but a URI source can be specified as well.

Actions

  • :install - install a font to the system fonts directory.

Properties

  • font_name - The file name of the font file name to install. The path defaults to the files/default directory of the cookbook you're calling windows_font from. Defaults to the resource name.
  • source - A local filesystem path or URI to source the font file from..

Examples

windows_font 'Code New Roman.otf'

windows_font 'Custom.otf' do
  source "https://example.com/Custom.otf"
end

windows_http_acl

Sets the Access Control List for an http URL to grant non-admin accounts permission to open HTTP endpoints.

Actions

  • :create - creates or updates the ACL for a URL.
  • :delete - deletes the ACL from a URL.

Properties

  • url - the name of the url to be created/deleted.
  • sddl - the DACL string configuring all permissions to URL. Mandatory for create if user is not provided. Can't be use with user.
  • user - the name (domain\user) of the user or group to be granted permission to the URL. Mandatory for create if sddl is not provided. Can't be use with sddl. Only one user or group can be granted permission so this replaces any previously defined entry. If you receive a parameter error your user may not exist.

Examples

windows_http_acl 'http://+:50051/' do
    user 'pc\\fred'
end
# Grant access to users "NT SERVICE\WinRM" and "NT SERVICE\Wecsvc" via sddl
windows_http_acl 'http://+:5985/' do
  sddl 'D:(A;;GX;;;S-1-5-80-569256582-2953403351-2909559716-1301513147-412116970)(A;;GX;;;S-1-5-80-4059739203-877974739-1245631912-527174227-2996563517)'
end
windows_http_acl 'http://+:50051/' do
    action :delete
end

windows_pagefile

Note: This resource is now included in Chef 14 and later. There is no need to depend on the Windows cookbook for this resource.

Configures the file that provides virtual memory for applications requiring more memory than available RAM or that are paged out to free up memory in use.

Actions

  • :set - configures the default pagefile, creating if it doesn't exist.
  • :delete - deletes the specified pagefile.

Properties

  • path - the path to the pagefile, String, name_property: true
  • system_managed - configures whether the system manages the pagefile size. [true, false]
  • automatic_managed - all of the settings are managed by the system. If this is set to true, other settings will be ignored. [true, false], default: false
  • initial_size - initial size of the pagefile in megbytes. Integer
  • maximum_size - maximum size of the pagefile in megbytes. Integer

windows_printer_port

Note: This resource is now included in Chef 14 and later. There is no need to depend on the Windows cookbook for this resource.

Create and delete TCP/IPv4 printer ports.

Actions

  • :create - Create a TCIP/IPv4 printer port. This is the default action.
  • :delete - Delete a TCIP/IPv4 printer port

Properties

  • ipv4_address - Name attribute. Required. IPv4 address, e.g. '10.0.24.34'
  • port_name - Port name. Optional. Defaults to 'IP_' + ipv4_address
  • port_number - Port number. Optional. Defaults to 9100.
  • port_description - Port description. Optional.
  • snmp_enabled - Boolean. Optional. Defaults to false.
  • port_protocol - Port protocol, 1 (RAW), or 2 (LPR). Optional. Defaults to 1.

Examples

Create a TCP/IP printer port named 'IP_10.4.64.37' with all defaults

windows_printer_port '10.4.64.37' do
  action :create
end

Delete a printer port

windows_printer_port '10.4.64.37' do
  action :delete
end

Delete a port with a custom port_name

windows_printer_port '10.4.64.38' do
  port_name 'My awesome port'
  action :delete
end

Create a port with more options

windows_printer_port '10.4.64.39' do
  port_name 'My awesome port'
  snmp_enabled true
  port_protocol 2
end

windows_printer

Note: This resource is now included in Chef 14 and later. There is no need to depend on the Windows cookbook for this resource.

Create Windows printer. Note that this doesn't currently install a printer driver. You must already have the driver installed on the system.

The Windows Printer resource will automatically create a TCP/IP printer port for you using the ipv4_address property. If you want more granular control over the printer port, just create it using the windows_printer_port resource before creating the printer.

Actions

  • :create - Create a new printer
  • :delete - Delete an existing printer

Properties

  • device_id - Printer queue name, e.g. 'HP LJ 5200 in fifth floor copy room'. Name property.
  • comment - Optional string describing the printer queue.
  • default - Boolean. Optional. Defaults to false. Note that Windows sets the first printer defined to the default printer regardless of this setting.
  • driver_name - String. Required. Exact name of printer driver. Note that the printer driver must already be installed on the node.
  • location - Printer location, e.g. 'Fifth floor copy room', or 'US/NYC/Floor42/Room4207'
  • shared - Boolean. Defaults to false.
  • share_name - Printer share name.
  • ipv4_address - Printer's IPv4 address, e.g. '10.4.64.23'. You don't have to be able to ping the IP address to set it. Required.

An error of "Set-WmiInstance : Generic failure" is most likely due to the printer driver name not matching or not being installed.

Examples

Create a printer

windows_printer 'HP LaserJet 5th Floor' do
  driver_name 'HP LaserJet 4100 Series PCL6'
  ipv4_address '10.4.64.38'
end

Delete a printer. Note: this doesn't delete the associated printer port. See windows_printer_port above for how to delete the port.

windows_printer 'HP LaserJet 5th Floor' do
  action :delete
end

windows_share

Creates, modifies and removes Windows shares. All properties are idempotent.

Note: This resource uses PowerShell cmdlets introduced in Windows 2012/8.

Actions

  • :create: creates/modifies a share
  • :delete: deletes a share

Properties

property type default description
share_name String resource name the share to assign to the share
path String The path of the location of the folder to share. Required when creating. If the share already exists on a different path then it is deleted and re-created.
description String description to be applied to the share
full_users Array [] users which should have "Full control" permissions
change_users Array [] Users are granted modify permission to access the share.
read_users Array [] users which should have "Read" permissions
temporary True/False false The lifetime of the new SMB share. A temporary share does not persist beyond the next restart of the computer
scope_name String '*' The scope name of the share.
ca_timeout Integer 0 The continuous availability time-out for the share.
continuously_available True/False false Indicates that the share is continuously available.
concurrent_user_limit Integer 0 (unlimited) The maximum number of concurrently connected users the share can accommodate
encrypt_data True/False false Indicates that the share is encrypted.

Examples

windows_share "foo" do
  action :create
  path "C:\\foo"
  full_users ["DOMAIN_A\\some_user", "DOMAIN_B\\some_other_user"]
  read_users ["DOMAIN_C\\Domain users"]
end
windows_share "foo" do
  action :delete
end

windows_shortcut

Note: This resource is now included in Chef 14 and later. There is no need to depend on the Windows cookbook for this resource.

Creates and modifies Windows shortcuts.

Actions

  • :create - create or modify a windows shortcut

Properties

  • shortcut_name - The name for the shortcut if it differs from the resource name. Name property
  • target - Where the shortcut links to.
  • arguments - arguments to pass to the target when the shortcut is executed
  • description - description of the shortcut
  • cwd - Working directory to use when the target is executed
  • iconlocation - Icon to use, in the format of "path, index" where index is which icon in that file to use (See WshShortcut.IconLocation)

Examples

Add a shortcut to all users desktop:

require 'win32ole'
all_users_desktop = WIN32OLE.new("WScript.Shell").SpecialFolders("AllUsersDesktop")

windows_shortcut "#{all_users_desktop}/Notepad.lnk" do
  target "C:\\Windows\\notepad.exe"
  description "Launch Notepad"
  iconlocation "C:\\Windows\\notepad.exe,0"
end

windows_path

Actions

  • :add - Add an item to the system path
  • :remove - Remove an item from the system path

Properties

  • path - Name attribute. The name of the value to add to the system path

Examples

Add Sysinternals to the system path

windows_path 'C:\Sysinternals' do
  action :add
end

Remove 7-Zip from the system path

windows_path 'C:\7-Zip' do
  action :remove
end

windows_user_privilege

Adds the principal (User/Group) to the specified privileges (such as Logon as a batch job or Logon as a Service).

Actions

  • :add - add the specified privileges to the principal
  • :remove - remove the specified privilege of the principal

Properties

  • principal - Name attribute, Required, String. The user or group to be granted privileges.
  • privilege - Required, String/Array. The privilege(s) to be granted.

Examples

Grant the Administrator user the Logon as a batch job and Logon as a service privilege.

windows_user_privilege 'Administrator' do
  privilege %w(SeBatchLogonRight SeServiceLogonRight)
end

Remove Logon as a batch job privilege of Administrator.

windows_user_privilege 'Administrator' do
  privilege %w(SeBatchLogonRight)
  action :remove
end

Available Privileges

SeTrustedCredManAccessPrivilege      Access Credential Manager as a trusted caller
SeNetworkLogonRight                  Access this computer from the network
SeTcbPrivilege                       Act as part of the operating system
SeMachineAccountPrivilege            Add workstations to domain
SeIncreaseQuotaPrivilege             Adjust memory quotas for a process
SeInteractiveLogonRight              Allow log on locally
SeRemoteInteractiveLogonRight        Allow log on through Remote Desktop Services
SeBackupPrivilege                    Back up files and directories
SeChangeNotifyPrivilege              Bypass traverse checking
SeSystemtimePrivilege                Change the system time
SeTimeZonePrivilege                  Change the time zone
SeCreatePagefilePrivilege            Create a pagefile
SeCreateTokenPrivilege               Create a token object
SeCreateGlobalPrivilege              Create global objects
SeCreatePermanentPrivilege           Create permanent shared objects
SeCreateSymbolicLinkPrivilege        Create symbolic links
SeDebugPrivilege                     Debug programs
SeDenyNetworkLogonRight              Deny access this computer from the network
SeDenyBatchLogonRight                Deny log on as a batch job
SeDenyServiceLogonRight              Deny log on as a service
SeDenyInteractiveLogonRight          Deny log on locally
SeDenyRemoteInteractiveLogonRight    Deny log on through Remote Desktop Services
SeEnableDelegationPrivilege          Enable computer and user accounts to be trusted for delegation
SeRemoteShutdownPrivilege            Force shutdown from a remote system
SeAuditPrivilege                     Generate security audits
SeImpersonatePrivilege               Impersonate a client after authentication
SeIncreaseWorkingSetPrivilege        Increase a process working set
SeIncreaseBasePriorityPrivilege      Increase scheduling priority
SeLoadDriverPrivilege                Load and unload device drivers
SeLockMemoryPrivilege                Lock pages in memory
SeBatchLogonRight                    Log on as a batch job
SeServiceLogonRight                  Log on as a service
SeSecurityPrivilege                  Manage auditing and security log
SeRelabelPrivilege                   Modify an object label
SeSystemEnvironmentPrivilege         Modify firmware environment values
SeManageVolumePrivilege              Perform volume maintenance tasks
SeProfileSingleProcessPrivilege      Profile single process
SeSystemProfilePrivilege             Profile system performance
SeUnsolicitedInputPrivilege          "Read unsolicited input from a terminal device"
SeUndockPrivilege                    Remove computer from docking station
SeAssignPrimaryTokenPrivilege        Replace a process level token
SeRestorePrivilege                   Restore files and directories
SeShutdownPrivilege                  Shut down the system
SeSyncAgentPrivilege                 Synchronize directory service data
SeTakeOwnershipPrivilege             Take ownership of files or other objects

windows_zipfile

Most version of Windows do not ship with native cli utility for managing compressed files. This resource provides a pure-ruby implementation for managing zip files. Be sure to use the not_if or only_if meta parameters to guard the resource for idempotence or action will be taken every Chef run.

Actions

  • :unzip - unzip a compressed file
  • :zip - zip a directory (recursively)

Properties

  • path - name attribute. The path where files will be (un)zipped to.
  • source - source of the zip file (either a URI or local path) for :unzip, or directory to be zipped for :zip.
  • overwrite - force an overwrite of the files if they already exist.
  • checksum - for :unzip, useful if source is remote, if the local file matches the SHA-256 checksum, Chef will not download it.

Examples

Unzip a remote zip file locally

windows_zipfile 'c:/bin' do
  source 'http://download.sysinternals.com/Files/SysinternalsSuite.zip'
  action :unzip
  not_if {::File.exists?('c:/bin/PsExec.exe')}
end

Unzip a local zipfile

windows_zipfile 'c:/the_codez' do
  source 'c:/foo/baz/the_codez.zip'
  action :unzip
end

Create a local zipfile

windows_zipfile 'c:/foo/baz/the_codez.zip' do
  source 'c:/the_codez'
  action :zip
end

Libraries

WindowsHelper

Helper that allows you to use helpful functions in windows

installed_packages

Returns a hash of all DisplayNames installed

# usage in a recipe
::Chef::Recipe.send(:include, Windows::Helper)
hash_of_installed_packages = installed_packages

is_package_installed?

  • package_name - The name of the package you want to query to see if it is installed
  • returns - true if the package is installed, false if it the package is not installed

Download a file if a package isn't installed

# usage in a recipe to not download a file if package is already installed
::Chef::Recipe.send(:include, Windows::Helper)
is_win_sdk_installed = is_package_installed?('Windows Software Development Kit')

remote_file 'C:\windows\temp\windows_sdk.zip' do
  source 'http://url_to_download/windows_sdk.zip'
  action :create_if_missing
  not_if {is_win_sdk_installed}
end

Do something if a package is installed

# usage in a provider
include Windows::Helper
if is_package_installed?('Windows Software Development Kit')
  # do something if package is installed
end

Windows::VersionHelper

Helper that allows you to get information of the windows version running on your node. It leverages windows ohai from kernel.os_info, easy to mock and to use even on linux.

core_version?

Determines whether given node is running on a windows Core.

if ::Windows::VersionHelper.core_version? node
  fail 'Windows Core is not supported'
end

workstation_version?

Determines whether given node is a windows workstation version (XP, Vista, 7, 8, 8.1, 10)

if ::Windows::VersionHelper.workstation_version? node
  fail 'Only server version of windows are supported'
end

server_version?

Determines whether given node is a windows server version (Server 2003, Server 2008, Server 2012, Server 2016)

if ::Windows::VersionHelper.server_version? node
  puts 'Server version of windows are cool'
end

nt_version

Determines NT version of the given node

case ::Windows::VersionHelper.nt_version node
  when '6.0' then 'Windows vista or Server 2008'
  when '6.1' then 'Windows 7 or Server 2008R2'
  when '6.2' then 'Windows 8 or Server 2012'
  when '6.3' then 'Windows 8.1 or Server 2012R2'
  when '10.0' then 'Windows 10'
end

Usage

Place an explicit dependency on this cookbook (using depends in the cookbook's metadata.rb) from any cookbook where you would like to use the Windows-specific resources/providers that ship with this cookbook.

depends 'windows'

License & Authors

Copyright 2011-2018, Chef Software, Inc.
Copyright 2010, VMware, Inc.
Copyright 2011, Business Intelligence Associates, Inc
Copyright 2012, Nordstrom, Inc.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.