begin to cleanup doc/man/cdist-types.text

Signed-off-by: Nico Schottelius <nico@kr.ethz.ch>
This commit is contained in:
Nico Schottelius 2011-02-23 13:55:42 +01:00
parent b8156ebede
commit 8513cca4d1

View file

@ -10,97 +10,59 @@ cdist-types - Functionality bundled
DESCRIPTION
-----------
A cdist type describes some kind of functionality.
Types can be run from manifests.
It is recommeneded to prefix all types with two
underscores, because types will be executed and
thus you prevent collisions with real binaries
(like "file").
A cdist type describes some kind of functionality, starting from
simple stuff like copying files until complex user auth/ldap/
kerberos infrastructure designs.
This document is a brainstorming document, on how to integrate types.
The name of every type is prefixed with two underscores (__),
because types will be executed and the two underscores prevent
collisions with real binaries (like "file").
Proposed/discussed structures:
It must be assumed that the clients are pretty dumb
and thus do not have high level tools like python
installed.
1) 2010-11-02
$basedir/$type/
properties/
name/
required # required | optional
choices # \n liste
If a type requires specific tools to be present
on the target, there must be another type that
provides this tool and the first type must create
an object of the specific type.
If the generated code fails on the client, it must
print diagnostistic messages on stderr and call
"exit 1", so the configuration is aborted.
meta/
default (shell script)
types/
pukman/
2) 2010-11-09
How to write my own type named "coffee":
Create the directory /etc/cdist/types/coffee/
Create the file /etc/cdist/types/coffee/README containing a description of the
type.
If your type supports attributes, create the directory /etc/cdist/types/coffee/
attributes.
For each attribute, create the file
/etc/cdist/types/coffee/attributes/$attribute_name which contains
a short description on the first line
then a blank line
then a long description (probably over several lines)
If you think your type may be useful for others, submit it for inclusion
into cdist at cdist -- at -- l.schottelius.org.
Create /etc/cdist/types/coffee/init which reads $configinput
(either via cconfig or via environment) and outputs a block of
shell code suitable for running on the client.
--------------------------------------------------------------------------------
type layout:
<name>/
config # binary that is called to adjust cconfig tree
change # binary that is called on the remote host?
--------------------------------------------------------------------------------
Scope of code execution on the client
It should be assumed that the clients are pretty dumb
and thus do not have high level tools like python
installed.
If a type requires specific tools to be present
on the target, there must be another type that
provides this tool and the first type must create
an object of the specific type.
If the generated code fails on the client, it must
print diagnostistic messages on stderr and call
"exit 1", so the configuration is aborted.
--------------------------------------------------------------------------------
- have required and optional arguments
- are independent of hosts
- are independent of hosts in general
- may make use of other types to realise a new type
- how to overwrite stuff?
- can overwrite stuff (HOW?)
- overwrite in own tree?
- needs knowledge of inherited provider
- similar to current situation in puppet,
but more like reusable defines
- or may implement some functionality on their own
--------------------------------------------------------------------------------
Differences manifests vs. types
HOW TO WRITE A NEW TYPE (TODO)
-----------------------
Assume you want to create the new type named "coffee":
manifests types
Create the directory /etc/cdist/types/coffee/
Create the file /etc/cdist/types/coffee/README containing a description of the
type.
If your type supports attributes, create the directory /etc/cdist/types/coffee/
attributes.
For each attribute, create the file
/etc/cdist/types/coffee/attributes/$attribute_name which contains
main purpose map config to host provide functionality
can change config no (prevent conflicts) yes (allow inheritance)
specificness site specific (globally) reusable
a short description on the first line
then a blank line
then a long description (probably over several lines)
If you think your type may be useful for others, submit it for inclusion
into cdist at cdist -- at -- l.schottelius.org.
Create /etc/cdist/types/coffee/init which reads $configinput
(either via cconfig or via environment) and outputs a block of
shell code suitable for running on the client.
SEE ALSO