Forum: CFEngine Help
Subject: How-to insert multi line string at the top of file ?
Author: juriskrumins
Link to topic: https://cfengine.com/forum/read.php?3,27226,27226#msg-27226
My intent is to insert multi line string at the top of the file. So I've
written following policy:
...
"banner_numsign" string =>
"########################################################################################
#
# WARNING!
# This configuration file is managed by CFengine. Do not edit this file manually
#
########################################################################################
",
comment => "Banner",
handle => "common_def_vars_banner_numsign";
bundle edit_line insert_before_line(string,linenum)
{
insert_lines:
"$(string)" location => before_line($(linenum));
}
body location before_line(linenum)
{
before_after => "before";
select_line_number => "$(linenum)";
}
bundle agent banner
{
files:
"/root/test"
handle => "file_banner",
comment => "Insert banner in file",
edit_line => insert_before_line("$(def.banner_numsign)",1);
}
And so when I execute this policy I have following result:
# cat /root/test
test1
test2
test3
# cf-agent
R: --> undefined is my policy hub.
R: --> CFE is running on cfdev
R: Machine is hardware node with OpenVZ kernel.
# cat /root/test
########################################################################################
#
# This configuration file is managed by CFengine. Do not edit this file manually
# WARNING!
#
########################################################################################
test1
test2
test3
#
So the lines gets inserted, but in the wrong oder, because CFEngine treats
multi line string as a number of lines, rather than single object. Seems like I
have to use insert_type attribute equal "preserve_block" for insert_lines
promise. But I can't figure out how to do it.
Can somebody point me to the right direction.
Thank you.
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