Forum: CFEngine Help
Subject: Re: "real" templates
Author: toddnni
Link to topic: https://cfengine.com/forum/read.php?3,23837,23846#msg-23846
I use few simple "tricks" with edit_line promises. For example lets consider a
template
# Some header with scalar $(mybundle.first_scalar)
Something that is always defined
$(mybundle.optional1)
$(mybundle.optional2)
and a bundle
bundle agent mybundle {
vars:
any::
"first_scalar" string => "$(somewhere_else.variable)";
print_line_1::
"optional1" string => "A string that will now appear.";
!print_line_1::
"optional1" string => ""; # -> Empty line
print_servers::
"server_list" slist => { "server1", "server2", "server3" };
"temporary_string"
string => join(" iburst$(const.endl)server ","server_list");
"optional2" string => "server $(temporary_string) iburst";
!print_servers::
"optional2" string => "";
files:
any::
"path/to/file"
create => "true",
edit_defaults => empty,
edit_line => expand_template("path/to/template");
}
First variables can be defined empty when line is not needed.
Second one can use join to creatively join lists (I think this is the trickery
that Neil mentioned). Optional2 would finally be
server server1 iburst
server server2 iburst
server server3 iburst
I'm not sure, but new concat function might also work
string => concat("server ", join(" iburst$(const.endl)server ", "server_list"),
" iburst")
However to create more complicated lines like
server server1 iburst something_dependent_on_server1
server server2 iburst something_dependent_on_server2
server server3 iburst something_dependent_on_server3
I would suggest to use insert_lines promises with select_region. Mark mentioned
this too.
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