UCL [FreeBSD WIKI]

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===== Overview =====
The UCL working group will discuss and develop a common set of keys for configuration files to be used throughout the base system, and plan for the implementation of UCL support in various utilities. The goal is to develop a template for all future configuration files that is human readable and writable, but is also hierarchical, expressive, and programmatically editable. The stretch goal is to develop a universal API for loading UCL configurations into the existing C structs used internally by the target application, to simplify implementing UCL in more places.

===== Topics =====
  * Opening: What is UCL
  * Presentation of work in progress: converting newsyslog and other tools in base to UCL
  * Discuss common requirements for configuration files
  * Discuss layering (/etc/defaults/foo.conf -> /etc/foo.conf -> /etc/foo.conf.d/*.conf -> /usr/local/etc/foo.conf.d/*.conf)
  * Develop a common set of grammar/keys to work across all configuration files ('enabled' activates/deactivates each block, allows disabling default configuration without modifying the default files, ala pkg)
  * Discuss required features for management utilities (uclcmd)
  * Identify additional targets to UCL-ify
  * Develop a universal API for using libucl in various applications, simplify loading configuration into C structs (libfigpar?)

==== Slides ====
[[http://www.allanjude.com/bsd/BSDCan2015_-_UCL_Working_Group.pdf|Allan's slides about converting the base system, and uclcmd]]

[[http://www.allanjude.com/bsd/cebka_BSDCan2015-UCL.pdf|Vsevolod's slides about the limitations and future of libucl]]

==== Attending ====

In order to attend you need register for the [[/DevSummit|developer summit]] as well as by email for the session and be confirmed by the working group organizer.  Follow the guidelines described on the [[DevSummit/201506|main page]] or what you received by email.  For questions or if in doubt ask the session chairs.

**Please do NOT add yourself here.** Your name will appear automatically once you have received the confirmation email. You need to put your name on the general [[DevSummit/201405|developer summit]] attendees list though.

^ Name ^ Username / Affiliation ^ Topics of Interest ^ Notes ^
| [[/JonathanAnderson|JonathanAnderson]] | jonathan | all |  |
| [[/JosephSAtkinson]] | jsa |  | cancelled |
| Michael Brink-Engel | Xinuos | all |  |
| [[/DavidChisnall|DavidChisnall]] | theraven | all |  |
| [[/BaptisteDaroussin|BaptisteDaroussin]] | bapt | all |  |
| [[/BradDavis|BradDavis]] | brd | all |  |
| [[/PeterGrehan|PeterGrehan]] | grehan | bhyve | cancelled |
| [[/JamesGritton|JamesGritton]] | jamie | jail.conf |  |
| [[/AllanJude|AllanJude]] | allanjude | all | Organizer |
| Christian Koch | Norse Corp |  |  |
| [[/ErwinLansing|ErwinLansing]] | erwin | all / operations |  |
| [[/JohannesMeixner|JohannesMeixner]] | xmj |  |  |
| Ken Moore | iXsystems | Lumina DE |  |
| [[/KrisMoore|KrisMoore]] | kmoore |  |  |
| Phillip Nordwall | Isilon |  |  |
| Pierre Pronchery | %%NetBSD%%/%%EdgeBSD%%/%%DeforaOS%% |  |  |
| [[/OllivierRobert|OllivierRobert]] | roberto |  |  |
| Phil Shafer | Juniper Networks, Inc. |  | libxo contrib |
| [[/VsevolodStakhov|VsevolodStakhov]] | vsevolod |  | libUCL author |
| Arun Thomas | BAE Systems |  |  |
| John Wolfe | Xinuos | all |  |

==== Results ====
  * libucl lacks some features that would be very useful. Some of those features are easier to add than others.
  * libucl cannot handle unknown variables well
  * libucl needs a way to preserve comments and macros during parsing
  * Jonathan Anderson recommends an AST
  * A number of additional files were identified as targets for UCL-ification