forked from ungleich-public/cdist
document stdin reading
Signed-off-by: Nico Schottelius <nico@brief.schottelius.org>
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@ -111,6 +111,33 @@ fi
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--------------------------------------------------------------------------------
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INPUT FROM STDIN
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-----------------
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Every type can access what has been written on stdin when it has been called.
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The result is saved into the ***stdin*** file in the object directory.
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Example use of a type: (e.g. in conf/type/__archlinux_hostname)
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--------------------------------------------------------------------------------
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__file /etc/rc.conf --source - << eof
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...
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HOSTNAME="$__target_host"
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...
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eof
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If you have not seen this syntax (<< eof) before, it may help you to read
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about "here documents".
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In the __file type, stdin is used as source for the file, if - is used for source:
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--------------------------------------------------------------------------------
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if [ -f "$__object/parameter/source" ]; then
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source="$(cat "$__object/parameter/source")"
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if [ "$source" = "-" ]; then
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source="$__object/stdin"
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fi
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....
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--------------------------------------------------------------------------------
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WRITING THE MANIFEST
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--------------------
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In the manifest of a type you can use other types, so your type extends
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