No responses? Ok, let me restate the problem more simply.
Given a file whose lines have three space-delimited fields, and given a
string variable that contains a similar line, how do I replace the
entire line in the file whose third field matches the third field in the
string with that variable? If there is no matching line, just insert the
string as a new line.
So if I have the file /tmp/test and the variable $(line) containing "a b
6" (not hard-coded but rather obtained from another host using
remotescalar()):
# cat /tmp/test
1 2 3
4 5 6
7 8 9
# cf-agent -Kf ./test.cf
# cat /tmp/test
1 2 3
a b 6
7 8 9
#
splitstring() returns an slist but you can't index into an slist to
match the ends of the lines, so the following does not work (but it or
something like it would be nice):
vars:
"line" string => remotescalar(...);
"fields" slist => splitstring("line", " ", 3);
delete_lines:
".*$(line[2])";
insert_lines:
"$(line)";
Thoughts?
Thanks,
Justin
-----Original Message-----
From: help-cfengine-boun...@cfengine.org
[mailto:help-cfengine-boun...@cfengine.org] On Behalf Of Justin Lloyd
Sent: Friday, February 26, 2010 6:22 PM
To: Help-cfengine
Subject: Editing known_hosts files
Ok, I'm thoroughly stumped here. I had something from testing several
months ago that I thought was doing the right thing, but now I don't
think it was.
I want to insert into ~root/.ssh/known_hosts on certain hosts the root
public ssh key from a trusted root host. But the trickier part is to
delete any lines from the known_hosts file that match the beginning and
end of the new key to be added without affecting any other lines. For
example, say I have
$(trustedhostkey) = "ssh-dss blahblahblahblah r...@trustedhost"
and in the local ~root/.ssh/known_hosts file:
ssh-dss someoldkeytexthere r...@trustedhost
ssh-dss someotherkeytextab r...@anotherhost
I just want to replace the first line with $(trustedhostkey) since the
whole line doesn't match the new key but it does match ssh-dss at the
beginning and r...@trustedhost at the end. (If the right key is already
in the file, then it can be left alone.)
Before I had something like
vars:
"key" string => remotescalar("root_key", "trustedhost", "yes"); #
yes = encryption
"key_fields" slist => splitstring("$(key)", " ", 3)
delete_lines:
"$(key_fields[0]) .* $(key_fields[2])";
insert_lines:
"$(key)";
But now I've noticed that the indexing of an slist doesn't work. I've
been playing around with replace_patterns, trying to figure out how I
might use $(match.N) backrefs, but no success yet.
Any thoughts on how to do this?
Thanks,
Justin
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