Sorry, that delete_lines promise should have read delete_lines: ".*$(fields[2])";
-----Original Message----- From: help-cfengine-boun...@cfengine.org [mailto:help-cfengine-boun...@cfengine.org] On Behalf Of Justin Lloyd Sent: Monday, March 01, 2010 11:50 AM To: Help-cfengine Subject: RE: Editing known_hosts files 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 This electronic communication and any attachments may contain confidential and proprietary information of DigitalGlobe, Inc. If you are not the intended recipient, or an agent or employee responsible for delivering this communication to the intended recipient, or if you have received this communication in error, please do not print, copy, retransmit, disseminate or otherwise use the information. Please indicate to the sender that you have received this communication in error, and delete the copy you received. DigitalGlobe reserves the right to monitor any electronic communication sent or received by its employees, agents or representatives. _______________________________________________ Help-cfengine mailing list Help-cfengine@cfengine.org https://cfengine.org/mailman/listinfo/help-cfengine _______________________________________________ Help-cfengine mailing list Help-cfengine@cfengine.org https://cfengine.org/mailman/listinfo/help-cfengine _______________________________________________ Help-cfengine mailing list Help-cfengine@cfengine.org https://cfengine.org/mailman/listinfo/help-cfengine
