further cleanups in the cdist-types manpage
Signed-off-by: Nico Schottelius <nico@kr.ethz.ch>
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@ -10,39 +10,35 @@ cdist-types - Functionality bundled
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DESCRIPTION
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DESCRIPTION
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-----------
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-----------
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A cdist type describes some kind of functionality, starting from
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A cdist type describes some kind of functionality, starting from simple stuff
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simple stuff like copying files until complex user auth/ldap/
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like copying files until complex user auth/ldap/ kerberos infrastructure
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kerberos infrastructure designs.
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designs. The name of every type is prefixed with two underscores (__), because
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types will be executed and the two underscores prevent collisions with real
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binaries (like "file").
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In general, types should be written independent of hosts (as in reusable
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code), but may be used implement functionality only needed on one host
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as well.
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It must be assumed that the clients are pretty dumb and thus do not have high
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level tools like ruby installed. If a type requires specific tools to be present
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on the target, there must be another type that provides this tool and the first
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type must create an object of the specific type.
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If the generated code fails on the client, it must print diagnostistic messages on
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stderr and exit non-zero, so the configuration is aborted.
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Types may make use of other types to realise a new type or may implement some
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functionality on their own.
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The name of every type is prefixed with two underscores (__),
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Types may consist of
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because types will be executed and the two underscores prevent
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- a number of required and optional parameters they accept,
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collisions with real binaries (like "file").
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- a manifest script that makes use of the parameters and may create other objects
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- explorers that explore type specific information on the target
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- a gencode script, that may generate code to be executed on the target
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It must be assumed that the clients are pretty dumb
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Every time a type is used, a new object is created of the specific type,
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and thus do not have high level tools like python
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with a type specific unique id that stores the parameters
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installed.
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If a type requires specific tools to be present
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on the target, there must be another type that
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provides this tool and the first type must create
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an object of the specific type.
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If the generated code fails on the client, it must
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print diagnostistic messages on stderr and call
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"exit 1", so the configuration is aborted.
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- are independent of hosts in general
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- may make use of other types to realise a new type
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- can overwrite stuff (HOW?)
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- overwrite in own tree?
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- needs knowledge of inherited provider
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- similar to current situation in puppet,
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but more like reusable defines
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- or may implement some functionality on their own
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HOW TO WRITE A NEW TYPE (TODO)
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HOW TO WRITE A NEW TYPE (TODO)
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-----------------------
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------------------------------
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Assume you want to create the new type named "coffee":
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Assume you want to create the new type named "coffee":
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Create the directory /etc/cdist/types/coffee/
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Create the directory /etc/cdist/types/coffee/
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@ -67,6 +63,8 @@ shell code suitable for running on the client.
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SEE ALSO
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SEE ALSO
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--------
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--------
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cdist-config-layout(7), cdist-type-manifest(7), cdist-type-explorer(7),
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cdist-type-gencode(7)
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COPYING
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COPYING
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