Here's a simpler case that also doesn't work the way that the
insert_select feature intuitively sounds like it should work. The
following example inserts all three lines in the created file, not just
the two that would be inserted if the insert_if_match_from_list
restricted insertions to lines that begin with "b".
bundle agent test {
files:
"/tmp/foo"
create => "true",
edit_line => blah;
}
bundle edit_line blah {
vars:
"lines" slist => { "foo", "bar", "baz" };
delete_lines:
".*";
insert_lines:
"$(lines)"
insert_select => begins_with_b;
}
body insert_select begins_with_b {
insert_if_match_from_list => { "b.*" };
}
Does anyone else make use of insert_select and can help understand how
to use it?
Thanks,
Justin
-----Original Message-----
From: Justin Lloyd
Sent: Friday, March 12, 2010 10:28 AM
To: help-cfengine@cfengine.org
Subject: RE: splitting a "blank" line
Can someone tell me if I'm missing something? I noticed that I could try
to prevent lines from being added with no netgroup name by using an
insert_select body with the insert_if_match_from_list parameter.
However, the documentation regarding this and related parameters is very
confusing:
http://www.cfengine.org/manuals/cf3-reference.html#insert_005fselect-in-
insert_005flines
insert_if_match_from_list: "Insert line if it fully matches a regex in
the list"
"The list contains regular expressions to search for in an secondary
file (not the main file being edited). If the regex matches a complete
line of the file, that line from the secondary file will be inserted at
the present location in the primary file."
What secondary file?! I'm wondering if that's just out-of-date
documentation. I thought I could just do something like this:
bundle edit_line enforce_passwd_netgroups(valid_netgroups) {
vars:
"netgroups" slist => { @(valid_netgroups) };
delete_lines:
"\...@.*";
insert_lines:
"+...@$(netgroups):x:::::"
insert_select => ignore_blank_values;
}
body insert_select ignore_blank_values {
insert_if_match_from_list => { "+...@[a-z].*" };
}
That didn't work and upon closer reading I got confused by the talk of a
secondary file, but with no explanation of where that file would even be
specified. It just doesn't make sense. Can anyone help me understand
this?
(Yes, this is a hack because I can't figure out how to otherwise deal
with blank results from my execresult() call.)
Thanks,
Justin
-----Original Message-----
From: help-cfengine-boun...@cfengine.org
[mailto:help-cfengine-boun...@cfengine.org] On Behalf Of Justin Lloyd
Sent: Thursday, March 11, 2010 7:01 PM
To: help-cfengine@cfengine.org
Subject: splitting a "blank" line
I want to do the following (unimportant details omitted) and so far I'm
stumped:
bundle agent test {
vars:
"output" string => execresult("somecommand", "noshell");
"netgroups" slist => splitstring("$(output)", "\s+", 20);
files:
"/etc/passwd"
edit_line => enforce_netgroups("@(this.netgroups)");
}
bundle edit_line enforce_netgroups(netgroups) {
delete_lines:
"\...@.*";
insert_lines:
"+...@$(netgroups):x:::::";
}
The problem is when "somecommand" returns a blank line, so $(output)
contains a single newline. Thus I end up with the single netgroup line
+@:x:::::
in my passwd file. It can be legitimate for the command to return a
blank line, meaning there are no allowed netgroups for a given host
(maybe it's not an ldap client; I will have a separate ldap_client class
later, but that's kinda beside the point for this exercise).
I've also tried using regline() in lots of ways to determine if the line
is blank, but I wasn't getting that to work. Having a Perl-like chomp()
feature might help. :)
So how do I detect it's a "blank" line, despite the newline, so that I
can prevent any lines from being inserted into the passwd file? Note
that I *do* want the files promise to occur since there may be invalid
netgroups for it to delete.
Thanks,
Justin
--
Justin C. Lloyd
Unix Infrastructure Engineer
DigitalGlobe, An Imaging and Information Company
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