9. cdist(1)

9.1. NAME

cdist - Usable Configuration Management

9.2. SYNOPSIS

cdist [-h] [-d] [-v] [-V] {banner,config,install,inventory,preos,shell,trigger} ...

cdist banner [-h] [-d] [-v]

cdist config [-h] [-d] [-v] [-b] [-C CACHE_PATH_PATTERN] [-c CONF_DIR]
             [-i MANIFEST] [-j [JOBS]] [-n] [-o OUT_PATH]
             [--remote-copy REMOTE_COPY] [--remote-exec REMOTE_EXEC]
             [-I INVENTORY_DIR] [-A] [-a] [-f HOSTFILE] [-p] [-s] [-t]
             [host [host ...]]

cdist install [-h] [-d] [-v] [-b] [-C CACHE_PATH_PATTERN] [-c CONF_DIR]
              [-i MANIFEST] [-j [JOBS]] [-n] [-o OUT_PATH]
              [--remote-copy REMOTE_COPY] [--remote-exec REMOTE_EXEC]
              [-I INVENTORY_DIR] [-A] [-a] [-f HOSTFILE] [-p] [-s] [-t]
              [host [host ...]]

cdist inventory [-h] [-d] [-v] [-b] [-I INVENTORY_DIR]
                {add-host,add-tag,del-host,del-tag,list} ...

cdist inventory add-host [-h] [-d] [-v] [-b] [-I INVENTORY_DIR]
                         [-f HOSTFILE]
                         [host [host ...]]

cdist inventory add-tag [-h] [-d] [-v] [-b] [-I INVENTORY_DIR]
                        [-f HOSTFILE] [-T TAGFILE] [-t TAGLIST]
                        [host [host ...]]

cdist inventory del-host [-h] [-d] [-v] [-b] [-I INVENTORY_DIR] [-a]
                         [-f HOSTFILE]
                         [host [host ...]]

cdist inventory del-tag [-h] [-d] [-v] [-b] [-I INVENTORY_DIR] [-a]
                        [-f HOSTFILE] [-T TAGFILE] [-t TAGLIST]
                        [host [host ...]]

cdist inventory list [-h] [-d] [-v] [-b] [-I INVENTORY_DIR] [-a]
                     [-f HOSTFILE] [-H] [-t]
                     [host [host ...]]

cdist preos [-h] preos

cdist preos debian [-h] [-d] [-v] [-b] [-a ARCH] [-B] [-C]
                   [-c CDIST_PARAMS] [-e REMOTE_EXEC] [-i MANIFEST]
                   [-k [KEYFILE [KEYFILE ...]]] [-m MIRROR]
                   [-p PXE_BOOT_DIR] [-r] [-S SCRIPT] [-s SUITE]
                   [-t TRIGGER_COMMAND] [-y REMOTE_COPY]
                   target_dir

cdist preos ubuntu [-h] [-d] [-v] [-b] [-a ARCH] [-B] [-C]
                   [-c CDIST_PARAMS] [-e REMOTE_EXEC] [-i MANIFEST]
                   [-k [KEYFILE [KEYFILE ...]]] [-m MIRROR]
                   [-p PXE_BOOT_DIR] [-r] [-S SCRIPT] [-s SUITE]
                   [-t TRIGGER_COMMAND] [-y REMOTE_COPY]
                   target_dir

cdist shell [-h] [-d] [-v] [-s SHELL]

cdist trigger [-h] [-d] [-v] [-b] [-C CACHE_PATH_PATTERN] [-c CONF_DIR]
              [-i MANIFEST] [-j [JOBS]] [-n] [-o OUT_PATH]
              [--remote-copy REMOTE_COPY] [--remote-exec REMOTE_EXEC]
              [-6] [-H HTTP_PORT]

9.3. DESCRIPTION

cdist is the frontend executable to the cdist configuration management. It supports different subcommands as explained below.

It is written in Python so it requires python(1) to be installed. It requires a minimal Python version 3.2.

9.4. GENERAL

All commands accept the following options:

-h, --help

Show the help screen

-d, --debug

Set log level to debug (deprecated, use -vvv instead)

-v, --verbose

Increase log level, be more verbose. Use it more than once to increase log level. The order of levels from the lowest to the highest are: ERROR, WARNING, INFO, DEBUG.

-V, --version

Show version and exit

9.6. CONFIG/INSTALL

Configure/install one or more hosts.

-A, --all-tagged

use all hosts present in tags db

-a, --all

list hosts that have all specified tags, if -t/--tag is specified

-b, --beta

Enable beta functionalities.

Can also be enabled using CDIST_BETA env var.

-C CACHE_PATH_PATTERN, --cache-path-pattern CACHE_PATH_PATTERN

Sepcify custom cache path pattern. It can also be set by CDIST_CACHE_PATH_PATTERN environment variable. If it is not set then default hostdir is used. For more info on format see CACHE PATH PATTERN FORMAT below.

-c CONF_DIR, --conf-dir CONF_DIR

Add a configuration directory. Can be specified multiple times. If configuration directories contain conflicting types, explorers or manifests, then the last one found is used. Additionally this can also be configured by setting the CDIST_PATH environment variable to a colon delimited list of config directories. Directories given with the --conf-dir argument have higher precedence over those set through the environment variable.

-f HOSTFILE, --file HOSTFILE

Read additional hosts to operate on from specified file or from stdin if '-' (each host on separate line). If no host or host file is specified then, by default, read hosts from stdin. For the file format see HOSTFILE FORMAT below.

-I INVENTORY_DIR, --inventory INVENTORY_DIR

Use specified custom inventory directory. Inventory directory is set up by the following rules: if this argument is set then specified directory is used, if CDIST_INVENTORY_DIR env var is set then its value is used, if HOME env var is set then ~/.cdit/inventory is used, otherwise distribution inventory directory is used.

-i MANIFEST, --initial-manifest MANIFEST

Path to a cdist manifest or - to read from stdin

-j [JOBS], --jobs [JOBS]

Specify the maximum number of parallel jobs; currently only global explorers are supported (currently in beta)

-n, --dry-run

Do not execute code

-o OUT_PATH, --out-dir OUT_PATH

Directory to save cdist output in

-p, --parallel

Operate on multiple hosts in parallel

-s, --sequential

Operate on multiple hosts sequentially (default)

--remote-copy REMOTE_COPY

Command to use for remote copy (should behave like scp)

--remote-exec REMOTE_EXEC

Command to use for remote execution (should behave like ssh)

-t, --tag

host is specified by tag, not hostname/address; list all hosts that contain any of specified tags

9.6.1. HOSTFILE FORMAT

HOSTFILE contains hosts per line. All characters after and including '#' until the end of line is a comment. In a line, all leading and trailing whitespace characters are ignored. Empty lines are ignored/skipped.

Hostfile line is processed like the following. First, all comments are removed. Then all leading and trailing whitespace characters are stripped. If such a line results in empty line it is ignored/skipped. Otherwise, host string is used.

9.6.2. CACHE PATH PATTERN FORMAT

Cache path pattern specifies path for a cache directory subdirectory. In the path, '%N' will be substituted by the target host, '%h' will be substituted by the calculated host directory, '%P' will be substituted by the current process id. All format codes that python datetime.strftime() function supports, except '%h', are supported. These date/time directives format cdist config/install start time.

If empty pattern is specified then default calculated host directory is used.

Calculated host directory is a hash of a host cdist operates on.

Resulting path is used to specify cache path subdirectory under which current host cache data are saved.

9.7. INVENTORY

Manage inventory database. Currently in beta with all sub-commands.

9.8. INVENTORY ADD-HOST

Add host(s) to inventory database.

host

host(s) to add

-b, --beta

Enable beta functionalities. Beta functionalities include inventory command with all sub-commands and all options; config sub-command options: -j/--jobs, -t/--tag, -a/--all.

Can also be enabled using CDIST_BETA env var.

-f HOSTFILE, --file HOSTFILE

Read additional hosts to add from specified file or from stdin if '-' (each host on separate line). If no host or host file is specified then, by default, read from stdin. Hostfile format is the same as config hostfile format.

-h, --help

show this help message and exit

-I INVENTORY_DIR, --inventory INVENTORY_DIR

Use specified custom inventory directory. Inventory directory is set up by the following rules: if this argument is set then specified directory is used, if CDIST_INVENTORY_DIR env var is set then its value is used, if HOME env var is set then ~/.cdist/inventory is used, otherwise distribution inventory directory is used.

9.9. INVENTORY ADD-TAG

Add tag(s) to inventory database.

host

list of host(s) for which tags are added

-b, --beta

Enable beta functionalities. Beta functionalities include inventory command with all sub-commands and all options; config sub-command options: -j/--jobs, -t/--tag, -a/--all.

Can also be enabled using CDIST_BETA env var.

-f HOSTFILE, --file HOSTFILE

Read additional hosts to add tags from specified file or from stdin if '-' (each host on separate line). If no host or host file is specified then, by default, read from stdin. If no tags/tagfile nor hosts/hostfile are specified then tags are read from stdin and are added to all hosts. Hostfile format is the same as config hostfile format.

-I INVENTORY_DIR, --inventory INVENTORY_DIR

Use specified custom inventory directory. Inventory directory is set up by the following rules: if this argument is set then specified directory is used, if CDIST_INVENTORY_DIR env var is set then its value is used, if HOME env var is set then ~/.cdist/inventory is used, otherwise distribution inventory directory is used.

-T TAGFILE, --tag-file TAGFILE

Read additional tags to add from specified file or from stdin if '-' (each tag on separate line). If no tag or tag file is specified then, by default, read from stdin. If no tags/tagfile nor hosts/hostfile are specified then tags are read from stdin and are added to all hosts. Tagfile format is the same as config hostfile format.

-t TAGLIST, --taglist TAGLIST

Tag list to be added for specified host(s), comma separated values

9.10. INVENTORY DEL-HOST

Delete host(s) from inventory database.

host

host(s) to delete

-a, --all

Delete all hosts

-b, --beta

Enable beta functionalities. Beta functionalities include inventory command with all sub-commands and all options; config sub-command options: -j/--jobs, -t/--tag, -a/--all.

Can also be enabled using CDIST_BETA env var.

-f HOSTFILE, --file HOSTFILE

Read additional hosts to delete from specified file or from stdin if '-' (each host on separate line). If no host or host file is specified then, by default, read from stdin. Hostfile format is the same as config hostfile format.

-I INVENTORY_DIR, --inventory INVENTORY_DIR

Use specified custom inventory directory. Inventory directory is set up by the following rules: if this argument is set then specified directory is used, if CDIST_INVENTORY_DIR env var is set then its value is used, if HOME env var is set then ~/.cdist/inventory is used, otherwise distribution inventory directory is used.

9.11. INVENTORY DEL-TAG

Delete tag(s) from inventory database.

host

list of host(s) for which tags are deleted

-a, --all

Delete all tags for specified host(s)

-b, --beta

Enable beta functionalities. Beta functionalities include inventory command with all sub-commands and all options; config sub-command options: -j/--jobs, -t/--tag, -a/--all.

Can also be enabled using CDIST_BETA env var.

-f HOSTFILE, --file HOSTFILE

Read additional hosts to delete tags for from specified file or from stdin if '-' (each host on separate line). If no host or host file is specified then, by default, read from stdin. If no tags/tagfile nor hosts/hostfile are specified then tags are read from stdin and are deleted from all hosts. Hostfile format is the same as config hostfile format.

-I INVENTORY_DIR, --inventory INVENTORY_DIR

Use specified custom inventory directory. Inventory directory is set up by the following rules: if this argument is set then specified directory is used, if CDIST_INVENTORY_DIR env var is set then its value is used, if HOME env var is set then ~/.cdist/inventory is used, otherwise distribution inventory directory is used.

-T TAGFILE, --tag-file TAGFILE

Read additional tags from specified file or from stdin if '-' (each tag on separate line). If no tag or tag file is specified then, by default, read from stdin. If no tags/tagfile nor hosts/hostfile are specified then tags are read from stdin and are added to all hosts. Tagfile format is the same as config hostfile format.

-t TAGLIST, --taglist TAGLIST

Tag list to be deleted for specified host(s), comma separated values

9.12. INVENTORY LIST

List inventory database.

host

host(s) to list

-a, --all

list hosts that have all specified tags, if -t/--tag is specified

-b, --beta

Enable beta functionalities. Beta functionalities include inventory command with all sub-commands and all options; config sub-command options: -j/--jobs, -t/--tag, -a/--all.

Can also be enabled using CDIST_BETA env var.

-f HOSTFILE, --file HOSTFILE

Read additional hosts to list from specified file or from stdin if '-' (each host on separate line). If no host or host file is specified then, by default, list all. Hostfile format is the same as config hostfile format.

-H, --host-only

Suppress tags listing

-I INVENTORY_DIR, --inventory INVENTORY_DIR

Use specified custom inventory directory. Inventory directory is set up by the following rules: if this argument is set then specified directory is used, if CDIST_INVENTORY_DIR env var is set then its value is used, if HOME env var is set then ~/.cdist/inventory is used, otherwise distribution inventory directory is used.

-t, --tag

host is specified by tag, not hostname/address; list all hosts that contain any of specified tags

9.13. PREOS

Create PreOS. Currently, the following PreOS-es are supported:

  • debian
  • ubuntu

9.14. PREOS DEBIAN

target_dir

target directory where PreOS will be bootstrapped

-a ARCH, --arch ARCH

target debootstrap architecture, by default 'amd64'

-B, --bootstrap

do bootstrap step

-b, --beta

Enable beta functionalities.

Can also be enabled using CDIST_BETA env var.

-C, --configure

do configure step

-c CDIST_PARAMS, --cdist-params CDIST_PARAMS

parameters that will be passed to cdist config, by default '-v' is used

-d, --debug

Set log level to debug

-e REMOTE_EXEC, --remote-exec REMOTE_EXEC

remote exec that cdist config will use, by default internal script is used

-h, --help

show this help message and exit

-i MANIFEST, --init-manifest MANIFEST

init manifest that cdist config will use, by default internal init manifest is used

-k [KEYFILE [KEYFILE ...]], --keyfile [KEYFILE [KEYFILE ...]]

ssh key files that will be added to cdist config; '__ssh_authorized_keys root ...' type is appended to initial manifest

-m MIRROR, --mirror MIRROR

use specified mirror for debootstrap

-p PXE_BOOT_DIR, --pxe-boot-dir PXE_BOOT_DIR

PXE boot directory

-r, --rm-bootstrap-dir

remove target directory after finishing

-S SCRIPT, --script SCRIPT

use specified script for debootstrap

-s SUITE, --suite SUITE

suite used for debootstrap, by default 'stable'

-t TRIGGER_COMMAND, --trigger-command TRIGGER_COMMAND

trigger command that will be added to cdist config; '__cdist_preos_trigger http ...' type is appended to initial manifest

-v, --verbose

Set log level to info, be more verbose

-y REMOTE_COPY, --remote-copy REMOTE_COPY

remote copy that cdist config will use, by default internal script is used

9.15. PREOS UBUNTU

target_dir

target directory where PreOS will be bootstrapped

-a ARCH, --arch ARCH

target debootstrap architecture, by default 'amd64'

-B, --bootstrap

do bootstrap step

-b, --beta

Enable beta functionalities.

Can also be enabled using CDIST_BETA env var.

-C, --configure

do configure step

-c CDIST_PARAMS, --cdist-params CDIST_PARAMS

parameters that will be passed to cdist config, by default '-v' is used

-d, --debug

Set log level to debug

-e REMOTE_EXEC, --remote-exec REMOTE_EXEC

remote exec that cdist config will use, by default internal script is used

-h, --help

show this help message and exit

-i MANIFEST, --init-manifest MANIFEST

init manifest that cdist config will use, by default internal init manifest is used

-k [KEYFILE [KEYFILE ...]], --keyfile [KEYFILE [KEYFILE ...]]

ssh key files that will be added to cdist config; '__ssh_authorized_keys root ...' type is appended to initial manifest

-m MIRROR, --mirror MIRROR

use specified mirror for debootstrap

-p PXE_BOOT_DIR, --pxe-boot-dir PXE_BOOT_DIR

PXE boot directory

-r, --rm-bootstrap-dir

remove target directory after finishing

-S SCRIPT, --script SCRIPT

use specified script for debootstrap

-s SUITE, --suite SUITE

suite used for debootstrap, by default 'xenial'

-t TRIGGER_COMMAND, --trigger-command TRIGGER_COMMAND

trigger command that will be added to cdist config; '__cdist_preos_trigger http ...' type is appended to initial manifest

-v, --verbose

Set log level to info, be more verbose

-y REMOTE_COPY, --remote-copy REMOTE_COPY

remote copy that cdist config will use, by default internal script is used

9.16. SHELL

This command allows you to spawn a shell that enables access to the types as commands. It can be thought as an "interactive manifest" environment. See below for example usage. Its primary use is for debugging type parameters.

-s SHELL, --shell SHELL

Select shell to use, defaults to current shell. Used shell should be POSIX compatible shell.

9.17. TRIGGER

Start trigger (simple http server) that waits for connections. When host connects then it triggers config or install command and then cdist config/install is executed which configures/installs host. Request path recognizes following requests:

  • /config/.* for config
  • /install/.* for install.
-6, --ipv6

Listen to both IPv4 and IPv6 (instead of only IPv4)

-b, --beta

Enable beta functionalities.

Can also be enabled using CDIST_BETA env var.

-C CACHE_PATH_PATTERN, --cache-path-pattern CACHE_PATH_PATTERN

Sepcify custom cache path pattern. It can also be set by CDIST_CACHE_PATH_PATTERN environment variable. If it is not set then default hostdir is used. For more info on format see CACHE PATH PATTERN FORMAT below.

-c CONF_DIR, --conf-dir CONF_DIR

Add configuration directory (can be repeated, last one wins)

-d, --debug

Set log level to debug

-H HTTP_PORT, --http-port HTTP_PORT

Create trigger listener via http on specified port

-h, --help

show this help message and exit

-i MANIFEST, --initial-manifest MANIFEST

path to a cdist manifest or '-' to read from stdin.

-j [JOBS], --jobs [JOBS]

Specify the maximum number of parallel jobs, currently only global explorers are supported

-n, --dry-run

do not execute code

-o OUT_PATH, --out-dir OUT_PATH

directory to save cdist output in

--remote-copy REMOTE_COPY

Command to use for remote copy (should behave like scp)

--remote-exec REMOTE_EXEC

Command to use for remote execution (should behave like ssh)

-v, --verbose

Set log level to info, be more verbose

9.18. FILES

~/.cdist
Your personal cdist config directory. If exists it will be automatically used.
~/.cdist/inventory
The home inventory directory. If ~/.cdist exists it will be used as default inventory directory.
~/.cdist/preos
PreOS plugins directory, if existing.
cdist/conf
The distribution configuration directory. It contains official types and explorers. This path is relative to cdist installation directory.
cdist/inventory
The distribution inventory directory. This path is relative to cdist installation directory.
cdist/preos
The distribution PreOS plugins directory.

9.19. NOTES

cdist detects if host is specified by IPv6 address. If so then remote_copy command is executed with host address enclosed in square brackets (see scp(1)).

9.20. EXAMPLES

# Configure ikq05.ethz.ch with debug enabled
% cdist config -d ikq05.ethz.ch

# Configure hosts in parallel and use a different configuration directory
% cdist config -c ~/p/cdist-nutzung \
    -p ikq02.ethz.ch ikq03.ethz.ch ikq04.ethz.ch

# Use custom remote exec / copy commands
% cdist config --remote-exec /path/to/my/remote/exec \
    --remote-copy /path/to/my/remote/copy \
    -p ikq02.ethz.ch ikq03.ethz.ch ikq04.ethz.ch

# Configure hosts read from file loadbalancers
% cdist config -f loadbalancers

# Configure hosts read from file web.hosts using 16 parallel jobs
# (beta functionality)
% cdist config -b -j 16 -f web.hosts

# Display banner
cdist banner

# Show help
% cdist --help

# Show Version
% cdist --version

# Enter a shell that has access to emulated types
% cdist shell
% __git
usage: __git --source SOURCE [--state STATE] [--branch BRANCH]
             [--group GROUP] [--owner OWNER] [--mode MODE] object_id

# Install ikq05.ethz.ch with debug enabled
% cdist install -d ikq05.ethz.ch

# List inventory content
% cdist inventory list -b

# List inventory for specified host localhost
% cdist inventory list -b localhost

# List inventory for specified tag loadbalancer
% cdist inventory list -b -t loadbalancer

# Add hosts to inventory
% cdist inventory add-host -b web1 web2 web3

# Delete hosts from file old-hosts from inventory
% cdist inventory del-host -b -f old-hosts

# Add tags to specifed hosts
% cdist inventory add-tag -b -t europe,croatia,web,static web1 web2

# Add tag to all hosts in inventory
% cdist inventory add-tag -b -t vm

# Delete all tags from specified host
% cdist inventory del-tag -b -a localhost

# Delete tags read from stdin from hosts specified by file hosts
% cdist inventory del-tag -b -T - -f hosts

# Configure hosts from inventory with any of specified tags
% cdist config -b -t web dynamic

# Configure hosts from inventory with all specified tags
% cdist config -b -t -a web dynamic

# Configure all hosts from inventory db
$ cdist config -b -A

# Create default debian PreOS in debug mode with config
# trigger command
$ cdist preos debian /preos/preos-debian -b -d -C \
    -k ~/.ssh/id_rsa.pub -p /preos/pxe-debian \
    -t "/usr/bin/curl 192.168.111.5:3000/config/"

# Create ubuntu PreOS with install trigger command
$ cdist preos ubuntu /preos/preos-ubuntu -b -C \
    -k ~/.ssh/id_rsa.pub -p /preos/pxe-ubuntu \
    -t "/usr/bin/curl 192.168.111.5:3000/install/"

# Start trigger in verbose mode that will configure host using specified
# init manifest
% cdist trigger -b -v -i ~/.cdist/manifest/init-for-triggered

9.21. ENVIRONMENT

TMPDIR, TEMP, TMP
Setup the base directory for the temporary directory. See http://docs.python.org/py3k/library/tempfile.html for more information. This is rather useful, if the standard directory used does not allow executables.
CDIST_PATH
Colon delimited list of config directories.
CDIST_LOCAL_SHELL
Selects shell for local script execution, defaults to /bin/sh.
CDIST_REMOTE_SHELL
Selects shell for remote script execution, defaults to /bin/sh.
CDIST_OVERRIDE
Allow overwriting type parameters.
CDIST_ORDER_DEPENDENCY
Create dependencies based on the execution order.
CDIST_REMOTE_EXEC
Use this command for remote execution (should behave like ssh).
CDIST_REMOTE_COPY
Use this command for remote copy (should behave like scp).
CDIST_INVENTORY_DIR
Use this directory as inventory directory.
CDIST_BETA
Enable beta functionalities.
CDIST_CACHE_PATH_PATTERN
Custom cache path pattern.

9.22. EXIT STATUS

The following exit values shall be returned:

0 Successful completion.

1 One or more host configurations failed.

9.23. AUTHORS

Originally written by Nico Schottelius <nico-cdist--@--schottelius.org> and Steven Armstrong <steven-cdist--@--armstrong.cc>.

9.24. CAVEATS

When operating in parallel, either by operating in parallel for each host (-p/--parallel) or by parallel jobs within a host (-j/--jobs), and depending on target SSH server and its configuration you may encounter connection drops. This is controlled with sshd MaxStartups configuration options. You may also encounter session open refusal. This happens with ssh multiplexing when you reach maximum number of open sessions permitted per network connection. In this case ssh will disable multiplexing. This limit is controlled with sshd MaxSessions configuration options. For more details refer to sshd_config(5).

When requirements for the same object are defined in different manifests (see example below) in init manifest and in some other type manifest and they differs then dependency resolver cannot detect dependencies right. This happens because cdist cannot prepare all objects first and then run objects because some object can depend on the result of type explorer(s) and explorers are executed during object run. cdist will detect such case and write warning message. Example for such a case:

init manifest:
    __a a
    require="__e/e" __b b
    require="__f/f" __c c
    __e e
    __f f
    require="__c/c" __d d
    __g g
    __h h

type __g manifest:
    require="__c/c __d/d" __a a

Warning message:
    WARNING: cdisttesthost: Object __a/a already exists with requirements:
    /usr/home/darko/ungleich/cdist/cdist/test/config/fixtures/manifest/init-deps-resolver /tmp/tmp.cdist.test.ozagkg54/local/759547ff4356de6e3d9e08522b0d0807/data/conf/type/__g/manifest: set()
    /tmp/tmp.cdist.test.ozagkg54/local/759547ff4356de6e3d9e08522b0d0807/data/conf/type/__g/manifest: {'__c/c', '__d/d'}
    Dependency resolver could not handle dependencies as expected.

9.25. COPYING

Copyright (C) 2011-2013 Nico Schottelius. Free use of this software is granted under the terms of the GNU General Public License v3 or later (GPLv3+).