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baptr/gist:5173516

Created March 15, 2013 22:14
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Class based copy source
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gistfile1.txt
$ cat copytest.cf
body common control {
bundlesequence => { "test" };
}
body copy_from local_cp(from) {
source => "$(from)";
compare => "digest";
}
bundle agent test {
vars:
"classlist" slist => { "classA", "classB" };
classes:
"classA" not => "classB";
files:
"/tmp/myfile"
copy_from => local_cp("/tmp/copytest/$(classlist)/myfile"),
ifvarclass => "$(classlist)";
}
$ /var/cfengine/bin/cf-agent -KIf ./copytest.cf -DclassA; cat /tmp/myfile
Running full policy integrity checks
-> Updated /tmp/myfile from source /tmp/copytest/classA/myfile on localhost
from classA!
$ /var/cfengine/bin/cf-agent -KIf ./copytest.cf -DclassA; cat /tmp/myfile
Running full policy integrity checks
from classA!
$ /var/cfengine/bin/cf-agent -KIf ./copytest.cf -DclassB; cat /tmp/myfile
Running full policy integrity checks
-> Updated /tmp/myfile from source /tmp/copytest/classB/myfile on localhost
from classB!
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baptr commented Mar 15, 2013

$ grep . /tmp/copytest/*/myfile
/tmp/copytest/classA/myfile:from classA!
/tmp/copytest/classB/myfile:from classB!

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baptr commented Mar 15, 2013

One thing to watch out for with this method, if multiple classes are defined, you'll see extra churn, and the class that iterates last from the list would win (assuming no locks):
$ /var/cfengine/bin/cf-agent -KIf ./copytest.cf -DclassA,classB; cat /tmp/myfile
Running full policy integrity checks
-> Updated /tmp/myfile from source /tmp/copytest/classA/myfile on localhost
-> Updated /tmp/myfile from source /tmp/copytest/classB/myfile on localhost
from classB!

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