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further cleanups in the cdist-types manpage

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Signed-off-by: Nico Schottelius <nico@kr.ethz.ch>
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Nico Schottelius 2011-02-23 14:04:07 +01:00
parent 8513cca4d1
commit 23782ea337
1 changed files with 26 additions and 28 deletions
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doc/man/cdist-types.text
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@ -10,39 +10,35 @@ cdist-types - Functionality bundled
DESCRIPTION
-----------
A cdist type describes some kind of functionality, starting from
simple stuff like copying files until complex user auth/ldap/
kerberos infrastructure designs.
A cdist type describes some kind of functionality, starting from simple stuff
like copying files until complex user auth/ldap/ kerberos infrastructure
designs. 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").
In general, types should be written independent of hosts (as in reusable
code), but may be used implement functionality only needed on one host
as well.
It must be assumed that the clients are pretty dumb and thus do not have high
level tools like ruby 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 exit non-zero, so the configuration is aborted.
Types may make use of other types to realise a new type or may implement some
functionality on their own.
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").
Types may consist of
- a number of required and optional parameters they accept,
- a manifest script that makes use of the parameters and may create other objects
- explorers that explore type specific information on the target
- a gencode script, that may generate code to be executed on the target
It must 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.
- are independent of hosts in general
- may make use of other types to realise a new type
- 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
Every time a type is used, a new object is created of the specific type,
with a type specific unique id that stores the parameters
HOW TO WRITE A NEW TYPE (TODO)
-----------------------
------------------------------
Assume you want to create the new type named "coffee":
Create the directory /etc/cdist/types/coffee/
@ -67,6 +63,8 @@ shell code suitable for running on the client.
SEE ALSO
--------
cdist-config-layout(7), cdist-type-manifest(7), cdist-type-explorer(7),
cdist-type-gencode(7)
COPYING