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@ -1,5 +1,5 @@ |
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cdist-type(7) |
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============== |
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============= |
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Nico Schottelius <nico-cdist--@--schottelius.org> |
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@ -20,39 +20,6 @@ use cdist, you'll write a type for every functionality you would like |
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to use. |
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Was man mit cdist type machen kann..... |
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A cdist type describes some kind of functionality, starting from simple stuff |
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like copying files until complex user auth/ldap/ kerberos infrastructure |
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designs. The name of every type is prefixed with two underscores (__) by convention. |
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, 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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Types may consist of |
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- a number of required and optional parameters they accept, |
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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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Every time a type is used, a new object is created of the specific type, |
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with a type specific unique id that stores the parameters |
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HOW TO USE A TYPE |
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----------------- |
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You can use types from the initial manifest or the type manifest like a |
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@ -128,12 +95,36 @@ which are documented in cdist-environment-variables(7). |
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Always ensure the manifest is executable, otherwise cdist will not be able |
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to execute it. |
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THE TYPE EXPLORERS |
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------------------ |
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WRITING THE GENCODE SCRIPT |
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-------------------------- |
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The gencode script can make use |
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The gencode script can make use of the parameters, the global explorers |
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and the type specific explorers. The output (stdout) of this script is |
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saved by cdist and will be executed on the target. |
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If the gencode script encounters an error, it should print diagnostic |
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messages to stderr and exit non-zero. If you need to debug the gencode |
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script, you can write to stderr: |
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-------------------------------------------------------------------------------- |
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# Debug output to stderr |
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echo "My fancy debug line" >&2 |
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# Output to be saved by cdist for execution on the target |
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echo "touch /etc/cdist-configured" |
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-------------------------------------------------------------------------------- |
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HINTS FOR TYPEWRITERS |
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---------------------- |
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It must be assumed that the target is pretty dumb and thus does 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 should create an object of the specific type. |
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HOW TO INCLUDE A TYPE INTO UPSTREAM CDIST |
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----------------------------------------- |
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@ -148,6 +139,7 @@ underscores) included. |
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SEE ALSO |
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-------- |
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- cdist-manifest-run(1) |
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- cdist-stages(7) |
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COPYING |
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