I'd do it as a two stage process:
1) Delete any line that has "(#\s*)?O QueueLA" . If you really want to be
fancy, I think you can say say "(#\s*)?O QueueLA=(?!100)" to only delete if the
value is not 100).
2) Insert "O QueueLA=100"
Remember, cfengine does not edit "the file", it edits a temporary and replaces
"the file" with the temporary if they are different - so you will be fine...
Alternatively, you can do this, but I think it is a tiny bit less efficient.
1) Delete "#\s+O QueueLA
2) Use set_variable_values to set the RHS to 100
-Dan
On Jun 29, 2011, at 5:50 PM, Aleksey Tsalolikhin wrote:
> Hi. I'm trying to write a policy to promise that sendmail.cf will
> contain the lines
> "O QueueLA=100" and "O RefuseLA=200" to raise the load average thresholds
> at which point sendmail will stop sending (or accepting) mail.
>
> I've got two scenarios:
>
> 1. sendmail contains the default, which is:
>
> # load average at which we just queue messages
> #O QueueLA=8
>
> # load average at which we refuse connections
> #O RefuseLA=12
>
> So I just do a search and replace, "#O QueueLA=8" to "O QueueLA=100",
> that works fine.
>
> Scenario #2:
> sendmail.cf has a DIFFERENT setting, e.g.
> O QueueLA=50
>
> I want to change that to "O QueueLA=100". This part is not working.
>
> The regex I am using in my replace_patterns promise is:
>
> "^O QueueLA=[^1][^0][^0]"
>
> Help, please?
>
> Here is my full policy:
>
> {{{
>
> # sendmail will by default refuse to accept messages if the load
> average is too high
>
> body common control {
> inputs => { "/var/cfengine/inputs/cfengine_stdlib.cf" };
> }
>
> bundle agent configure_sendmail_not_to_refuse_messages_under_high_load {
>
> files:
> "/etc/mail/sendmail.cf"
> edit_line => set_Queue_LA_and_Refuse_LA_to_very_high_values,
> comment => "Raise QueueLA and RefuseLA ridiculously high,
> so that the OS craps out before sendmail does. By default, sendmail
> will limit its functionality under high load. Well, don't do that.
> Maybe my server can operate under high load. Maybe I like to squeeze
> a lot of work out of my server.";
>
> commands:
> reload_sendmail::
> "/etc/init.d/sendmail reload";
> }
>
>
> bundle edit_line set_Queue_LA_and_Refuse_LA_to_very_high_values {
>
> replace_patterns:
>
> "^#O QueueLA.*$"
>
> replace_with => value("O QueueLA=100"),
> classes => if_repaired("reload_sendmail"),
> comment => "Replace default line with my line";
>
> replace_patterns:
>
> "^O QueueLA=[^1][^0][^0]"
>
> replace_with => value("O QueueLA=100"),
> classes => if_repaired("reload_sendmail"),
> comment => "Replace non-matching value for QueueLA (not
> 100) with my value (100)";
>
>
>
> replace_patterns:
>
> "^#O RefuseLA.*$"
>
> replace_with => value("O RefuseLA=200"),
> classes => if_repaired("reload_sendmail");
>
>
> replace_patterns:
>
> "^O RefuseLA=[^2][^0][^0]"
>
> replace_with => value("O RefuseLA=200"),
> classes => if_repaired("reload_sendmail"),
> comment => "Replace non-matching value for RefuseLA (not
> 200) with my value (200)";
> }
>
> }}}
>
> I would like to keep the line with the parameter just below the
> comment describing it, as it is before Cfengine touches the file.
>
> Yours,
> Aleksey
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> Help-cfengine@cfengine.org
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