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authorChristian Poessinger <christian@poessinger.com>2019-11-11 17:00:12 +0100
committerChristian Poessinger <christian@poessinger.com>2019-11-11 17:00:12 +0100
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treebab1568eb4a4e1264adfafc7c80e6b393516fd86 /docs/contributing/vyos_cli.rst
parent2c0b0bf509ead5e301d8f47f75c57ac8f357dd15 (diff)
downloadvyos-documentation-0e33d4179aefd53435c143b2ad125a8c3fba90e4.tar.gz
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contribution: restructure entire chapter
- move subchapters to sub-sub chapters and try to have more internal references to e.g. commit rules.
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-.. _vyos_cli:
-
-The VyOS CLI
-============
-
-The bash (or better vbash) completion in VyOS is defined in *templates*.
-Templates are text files (called ``node.def``) stored in a directory tree. The
-directory names define the command names, and template files define the command
-behaviour. Before VyOS 1.2 (crux) this files were created by hand. After a
-complex redesign process_ the new style template are automatically generated
-from a XML input file.
-
-XML interface definitions for VyOS come with a RelaxNG schema and are located
-in the vyos-1x_ module. This schema is a slightly modified schema from VyConf_
-alias VyOS 2.0 So VyOS 1.2.x interface definitions will be reusable in Nextgen
-VyOS Versions with very minimal changes.
-
-The great thing about schemas is not only that people can know the complete
-grammar for certain, but also that it can be automatically verified. The
-`scripts/build-command-templates` script that converts the XML definitions to
-old style templates also verifies them against the schema, so a bad definition
-will cause the package build to fail. I do agree that the format is verbose, but
-there is no other format now that would allow this. Besides, a specialized XML
-editor can alleviate the issue with verbosity.
-
-Example XML File
-----------------
-
-.. code-block:: xml
-
- <?xml version="1.0"?>
- <!-- Cron configuration -->
- <interfaceDefinition>
- <node name="system">
- <children>
- <node name="task-scheduler">
- <properties>
- <help>Task scheduler settings</help>
- </properties>
- <children>
- <tagNode name="task" owner="${vyos_conf_scripts_dir}/task_scheduler.py">
- <properties>
- <help>Scheduled task</help>
- <valueHelp>
- <format>&lt;string&gt;</format>
- <description>Task name</description>
- </valueHelp>
- <priority>999</priority>
- </properties>
- <children>
- <leafNode name="crontab-spec">
- <properties>
- <help>UNIX crontab time specification string</help>
- </properties>
- </leafNode>
- <leafNode name="interval">
- <properties>
- <help>Execution interval</help>
- <valueHelp>
- <format>&lt;minutes&gt;</format>
- <description>Execution interval in minutes</description>
- </valueHelp>
- <valueHelp>
- <format>&lt;minutes&gt;m</format>
- <description>Execution interval in minutes</description>
- </valueHelp>
- <valueHelp>
- <format>&lt;hours&gt;h</format>
- <description>Execution interval in hours</description>
- </valueHelp>
- <valueHelp>
- <format>&lt;days&gt;d</format>
- <description>Execution interval in days</description>
- </valueHelp>
- <constraint>
- <regex>[1-9]([0-9]*)([mhd]{0,1})</regex>
- </constraint>
- </properties>
- </leafNode>
- <node name="executable">
- <properties>
- <help>Executable path and arguments</help>
- </properties>
- <children>
- <leafNode name="path">
- <properties>
- <help>Path to executable</help>
- </properties>
- </leafNode>
- <leafNode name="arguments">
- <properties>
- <help>Arguments passed to the executable</help>
- </properties>
- </leafNode>
- </children>
- </node>
- </children>
- </tagNode>
- </children>
- </node>
- </children>
- </node>
- </interfaceDefinition>
-
-Configuration mode command definitions
---------------------------------------
-
-Command definitions are purely declarative, and cannot contain any logic. All
-logic for generating config files for target applications, restarting services
-and so on is implemented in configuration scripts instead.
-
-Command syntax guidelines
-*************************
-
-Use of numbers
-^^^^^^^^^^^^^^
-
-Use of numbers in command names **should** be avoided unless a number is a
-part of a protocol name or similar. Thus, ``protocols ospfv3`` is perfectly
-fine, but something like ``server-1`` is questionable at best.
-
-Help string guidelines
-**********************
-
-To ensure uniform look and feel, and improve readability, we should follow a
-set of guidelines consistently.
-
-Capitalization and punctuation
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-The first word of every help string **must** be capitalized. There **must not**
-be a period at the end of help strings.
-
-Rationale: this seems to be the unwritten standard in network device CLIs, and
-a good aesthetic compromise.
-
-Examples:
-
-* Good: "Frobnication algorithm"
-* Bad: "frobnication algorithm"
-* Bad: "Frobnication algorithm."
-* Horrible: "frobnication algorithm."
-
-Use of abbreviations and acronyms
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-Abbreviations and acronyms **must** be capitalized.
-
-Examples:
-
-* Good: "TCP connection timeout"
-* Bad: "tcp connection timeout"
-* Horrible: "Tcp connectin timeout"
-
-Acronyms also **must** be capitalized to visually distinguish them from normal
-words:
-
-Examples:
-
-* Good: RADIUS (as in remote authentication for dial-in user services)
-* Bad: radius (unless it's about the distance between a center of a circle and
- any of its points)
-
-Some abbreviations are traditionally written in mixed case. Generally, if it
-contains words "over" or "version", the letter **should** be lowercase. If
-there's an accepted spelling (especially if defined by an RFC or another
-standard), it **must** be followed.
-
-Examples:
-
-* Good: PPPoE, IPsec
-* Bad: PPPOE, IPSEC
-* Bad: pppoe, ipsec
-
-Use of verbs
-^^^^^^^^^^^^
-
-Verbs **should** be avoided. If a verb can be omitted, omit it.
-
-Examples:
-
-* Good: "TCP connection timeout"
-* Bad: "Set TCP connection timeout"
-
-If a verb is essential, keep it. For example, in the help text of ``set system
-ipv6 disable-forwarding`, "Disable IPv6 forwarding on all interfaces" is a
-perfectly justified wording.
-
-Prefer infinitives
-^^^^^^^^^^^^^^^^^^
-
-Verbs, when they are necessary, **should** be in their infinitive form.
-
-Examples:
-
-* Good: "Disable IPv6 forwarding"
-* Bad: "Disables IPv6 forwarding"
-
-Mapping old node.def style to new XML definitions
--------------------------------------------------
-
-.. list-table::
- :widths: 25 25 50
- :header-rows: 1
-
- * - Old concept/syntax
- - New syntax
- - Notes
- * - mynode/node.def
- - <node name="mynode"> </node>
- - Leaf nodes (nodes with values) use <leafNode> tag instead
- * - mynode/node.tag , tag:
- - <tagNode name="mynode> </node>
- -
- * - help: My node
- - <properties> <help>My node</help>
- -
- * - val_help: <format>; some string
- - <properties> <valueHelp> <format> format </format> <description> some
- string </description>
- - Do not add angle brackets around the format, they will be inserted
- automatically
- * - syntax:expression: pattern
- - <properties> <constraint> <regex> ...
- - <constraintErrorMessage> will be displayed on failure
- * - syntax:expression: $VAR(@) in "foo", "bar", "baz"
- - None
- - Use regex
- * - syntax:expression: exec ...
- - <properties> <constraint> <validator> <name ="foo" argument="bar">
- - "${vyos_libexecdir}/validators/foo bar $VAR(@)" will be executed,
- <constraintErrorMessage> will be displayed on failure
- * - syntax:expression: (arithmetic expression)
- - None
- - External arithmetic validator may be added if there's demand, complex
- validation is better left to commit-time scripts
- * - priority: 999
- - <properties> <priority>999</priority>
- - Please leave a comment explaining why the priority was chosen (e.g. "after
- interfaces are configured")
- * - multi:
- - <properties> <multi/>
- - Only applicable to leaf nodes
- * - allowed: echo foo bar
- - <properties> <completionHelp> <list> foo bar </list>
- -
- * - allowed: cli-shell-api listNodes vpn ipsec esp-group
- - <properties> <completionHelp> <path> vpn ipsec esp-group </path> ...
- -
- * - allowed: /path/to/script
- - <properties> <completionHelp> <script> /path/to/script </script> ...
- -
- * - default:
- - None
- - Move default values to scripts
- * - commit:expression:
- - None
- - All commit time checks should be in the verify() function of the script
- * - begin:/create:/delete:
- - None
- - All logic should be in the scripts
-
-.. _process: https://blog.vyos.io/vyos-development-digest-10
-.. _vyos-1x: https://github.com/vyos/vyos-1x/blob/current/schema/
-.. _VyConf: https://github.com/vyos/vyconf/blob/master/data/schemata