Forum: CFEngine Help
Subject: Re: delete_lines and select region
Author: jbdenis
Link to topic: https://cfengine.com/forum/read.php?3,26551,26634#msg-26634
A big thank you to both of you for rephrasing more clearly to me what is
already in the documentation.
I think I've been misguided by some of my test.
Imagine the initial file contains only the anchor line :
# cat /tmp/myfile
#### CFENGINE ANCHOR
#
If I run this test :
# cat test.cf
body common control
{
bundlesequence => { example };
inputs => { "cfengine_stdlib.cf" };
}
bundle agent example
{
files:
"/tmp/myfile"
edit_line => editfile,
create => "true";
}
bundle edit_line editfile
{
vars:
"sdelim" string => "#### CFENGINE ANCHOR";
# We do this to make the classname unique per filename, so that this
bundle
# can be used on different files without interference.
"classname" string => canonify("$(edit.filename)");
delete_lines:
".*"
select_region => from_line("$(sdelim)"),
classes => if_ok("$(classname)"),
ifvarclass => "!$(classname)";
# I want to insert my anchor line if it is not present the first time
insert_lines:
"1";
"2";
"3";
}
body select_region from_line(start)
{
select_start => "$(start)";
include_start_delimiter => "false";
}
The insert_lines statement are not honored :
# cat /tmp/myfile
#### CFENGINE ANCHOR
The verbose output is of the run is here : https://gist.github.com/3171142
But if I add an empty line at the end of this file (to give something to delete
to delete_lines), everything is fine :
# echo >> /tmp/myfile
# cf-agent -K -f ./test.cf
# cat /tmp/myfile
#### CFENGINE ANCHOR
1
2
3
>From the verbose output, we can see that the class "guard" classname is not
>defined because there is nothing to delete, hence the result. I guess I'll
>have to tweak my promise or find another way.
I've got another test I wanted to post, but your answers confirmed that there
is definitively something wrong on my side.
Thank you again for the help.
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