I think I understand Jesse's rationale but I agree with Neil. Analogously to the Unix command philosophy, IMHO, bodies (and often bundles) should do one thing and do it well. Use multiple promises in conjunction like you would use command-line pipes.
Jesse, have you maybe tried something with a methods promise as wrapper around calls to multiple bundles, using usebundle, to encapsulate everything into a single "call"? I don't know if that would help with what you're trying to do, but it came to mind as I was writing the first paragraph. :) Justin -----Original Message----- From: Jesse Becker [mailto:becker...@mail.nih.gov] Sent: Friday, March 05, 2010 12:57 PM To: nwat...@symcor.com Cc: Becker, Jesse (NIH/NHGRI) [C]; help-cfengine@cfengine.org; help-cfengine-boun...@cfengine.org; Justin Lloyd Subject: Re: Thoughts about copy_from On Fri, Mar 05, 2010 at 02:45:19PM -0500, nwat...@symcor.com wrote: >help-cfengine-boun...@cfengine.org wrote on 2010-03-05 14:37:57: >> I'd like to add one more suggestion as well: >> >> * Include the ability to call expand_scalars in the same promise as >> copying a file from a remote host. Currently, this has to be done >via >> two separate promises: one to copy the file to the local host, and >a >> second to call edit_files and expand the variables. > >Technically they are separate. One involves a comparision, a copy and Yes, and I actually understand why, and how to implement it using a copy/expand two-step process. I've been trying to make this into a generic bundle (but have been stymied in various ways, prompting various recent mailng list posts). I also think that they could could be combined into one step in order to simplfy the promises. Just be sure to make the comparison based on mtimes, and not checksums so you aren't constantly rebuilding the file (unless that is what you want...). >possibly a verify of a source file. The second edits a copy of that file >that was copied. > >cfserverd:/var/masterfiles/source-template >| >copy >| >cfagent:/tmp/souce-template-copy >| >edit and save to new location >| >/etc/final-target-file > > >Sincerely, >-- >Neil Watson >416-673-3465 > >> >> >* The reference manual doesn't specify the default value for >copy_from's >> >copy_backup attribute. (That goes for a number of things in the >> >documentation, actually.) >> > >> >* cfengine_stdlib.cf has several copy_from bodies. secure_cp is useful >> >but I prefer a secure_cp with a backup, so I created my own >> >(secure_copy_with_backup) in my own library file. A third >> >"backup=true|false" parameter to the standard copy_from bodies may be >> >valuable, but that would break existing policy files, so it's just a >> >thought. >> > >> >* It might be nice to have the file extension appended when copy_backup >> >is used to be configurable beyond just the default ".cfsaved" text and >> >"timestamp" options, mainly to allow for multiple backups, similar to >> >what various log rotation commands provide. I can see how it may be >> >argued that this goes against Cfengine's convergent nature, but since >it >> >already provides the timestamp option, I thought I'd throw this out >> >there anyway. A files promise could be used to limit the number of >> >backups, or that could be another attribute. >> > >> >That is all. :) >> > >> >-- >> >Justin C. Lloyd >> >Unix Infrastructure Engineer >> >DigitalGlobe, An Imaging and Information Company >> > >> > >> >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. 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