cleanup cdist-type
Signed-off-by: Nico Schottelius <nico@brief.schottelius.org>
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Nico Schottelius
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5e00ac702a
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3d8f26b42a
2 changed files with 28 additions and 46 deletions
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@ -28,31 +28,6 @@ cdist-manifest::
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cdist-type::
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Understand how types are working and created [intermediate]
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CREATING YOUR FIRST OWN TYPE
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----------------------------
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=> short example, reference to cdist-type(7)!
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=> motivation
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Use a type to bundle functionalitY
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<with object id? or signleton here already>
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Debug with var - can be used by yourself
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__debug::
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If this variable is setup, cdist runs in debug mode.
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You can use this information, to only output stuff in debug
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mode as well.
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Available for: initial manifest, type manifest, gencode, code
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USING EXPLORERS
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---------------
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cdist-explorer.text
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DEBUGGING YOUR TYPES
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--------------------
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cdist-best-practice::
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Hints from real life experience to help you to organise cdist [intermediate]
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@ -37,11 +37,12 @@ __package tree --state installed
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A list of supported types can be found in the cdist-reference(7) manpage.
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SINGLETON TYPES
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---------------
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If a type is flagged as a singleton, it may me used only once. This
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is useful for types which can be used only once on a system. If a type
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can only be used once, it does not take an
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If a type is flagged as a singleton, it may be used only
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once per host. This is useful for types which can be used only once on a
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system. Singleton types do not take an object name as argument.
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Example:
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--------------------------------------------------------------------------------
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@ -53,7 +54,6 @@ __myfancysingleton --colour green
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--------------------------------------------------------------------------------
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HOW TO WRITE A NEW TYPE
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-----------------------
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A type consists of
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@ -65,17 +65,16 @@ A type consists of
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- gencode (optional)
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Types are stored below conf/type/. Their name should always be prefixed with
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two underscores (__) to prevent collisions with other binaries in $PATH.
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two underscores (__) to prevent collisions with other executables in $PATH.
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To begin a new type from a template, execute "cdist-type-template __NAME"
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and cd conf/type/__NAME.
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To begin a new type, just create the directory **conf/type/__NAME**.
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DEFINING PARAMETERS
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-------------------
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Every type consists of optional and required parameters, which must
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be created in a newline seperated file in parameters/required and
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parameters/optional. If either or both missing, the type will have
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be created in a newline seperated file in ***parameters/required*** and
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***parameters/optional***. If either or both missing, the type will have
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no required, no optional or no parameters at all.
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Example:
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@ -110,21 +109,27 @@ As you can see, the type can reference different environment variables,
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which are documented in cdist-reference(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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to execute it. For more information about manifests see cdist-manifest(7).
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SINGLETON - ONLY INSTANCE ONLY
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------------------------------
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If you want to ensure that a type can only be used once per target, you can
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mark it as a singleton: Just create the (empty) file "singleton" in your type
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directory. This will also change the way your type must be called:
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directory:
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--------------------------------------------------------------------------------
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touch conf/type/__NAME/singleton
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--------------------------------------------------------------------------------
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This will also change the way your type must be called:
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--------------------------------------------------------------------------------
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__YOURTYPE --parameter value
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--------------------------------------------------------------------------------
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As you can see, the ID is omitted, because it does not make any sense, if your
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type can be used only once.
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As you can see, the object ID is omitted, because it does not make any sense,
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if your type can be used only once.
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THE TYPE EXPLORERS
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@ -134,7 +139,7 @@ explorers, which will be executed on the target for every created object.
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The explorers are stored under the "explorer" directory below the type.
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It could for instance contain code to check the md5sum of a file on the
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client, like this (shortened version from real type __file):
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client, like this (shortened version from the type __file):
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--------------------------------------------------------------------------------
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if [ -f "$__object/parameter/destination" ]; then
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@ -151,15 +156,15 @@ fi
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WRITING THE GENCODE SCRIPT
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--------------------------
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There are two gencode scripts: gencode-local and gencode-remote.
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There are two gencode scripts: ***gencode-local*** and ***gencode-remote***.
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The output of gencode-local is executed locally, whereas
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the output of gencode-remote is executed on the target.
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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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The gencode scripts can make use of the parameters, the global explorers
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and the type specific explorers. The output (stdout) of these 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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If the gencode scripts encounter 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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@ -181,13 +186,14 @@ type should create an object of the specific type.
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If your type wants to save temporary data, that may be used by other types
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later on (for instance __file), you can save them in the subdirectory
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"files" below $__object (but you must create it yourself). cdist will not touch
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this directory.
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"files" below $__object (but you must create it yourself).
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cdist will not touch this directory.
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If your type contains static files, it's also recommended to place them in
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a folder named "files" within the type (again, because cdist guarantees to
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never ever touch this folder).
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HOW TO INCLUDE A TYPE INTO UPSTREAM CDIST
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-----------------------------------------
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If you think your type may be useful for others, ensure it works with the
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@ -203,9 +209,10 @@ SEE ALSO
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--------
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- cdist-explorer(7)
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- cdist-stages(7)
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- cdist-tutorial(7)
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COPYING
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-------
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Copyright \(C) 2011 Nico Schottelius. Free use of this software is
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Copyright \(C) 2011-2012 Nico Schottelius. Free use of this software is
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granted under the terms of the GNU General Public License version 3 (GPLv3).
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