Mailman List Membership Changes
In this example, we report changes in GNU Mailman list memberships, both by count, also by doing a diff against the previous list membership.
The MailmanListMembershipChanges script might send an alert message like the following:
PIKT ALERT Thu Sep 15 14:52:47 2005 moscow INFO: MailmanListMembershipChanges Report changes in Mailman list memberships. for emf-announce, current membership is now 1777, was 1775 < email@example.com --- > firstname.lastname@example.org 118a119 > email@example.com 434d434 < firstname.lastname@example.org 748d747 > email@example.com 1053d1051 > firstname.lastname@example.org for emr-comm, current membership is now 347, was 346 > email@example.com
The script follows.
MailmanListMembershipChanges init status =piktstatus level =piktlevel task "Report changes in Mailman list memberships." input proc "=mailmanbindir/list_lists | =egrep -iv matching" dat $list 1 keys $list rule // initialize for current list set #changed = #false() rule // determine current list membership set #mbrs = #val($command("=mailmanbindir/list_members $list | =wc -l")) rule // determine if membership changed if #mbrs != %mbrs output mail "for $list, current membership is now $text(#mbrs), was $text(%mbrs)" set #changed = #true() fi rule // if changed and have list history, mv to backup if #changed if -e "=hstdir/mailman/$list" =execwait "=mv =hstdir/mailman/$list =hstdir/mailman/$list\.piktbak" fi fi rule // save current membership in the histories/mailman directory if ! -d "=hstdir/mailman" =execwait "=mkdir =hstdir/mailman; =chmod 750 =hstdir/mailman" fi =execwait "=mailmanbindir/list_members $list > =hstdir/mailman/$list" rule // if changed, and we have a backup of the previous // list, diff the current against the previous, // else dump the current list if #changed if -e "=hstdir/mailman/$list\.piktbak" =outputproc(mail, "=diff =hstdir/mailman/$list\.piktbak =hstdir/mailman/$list | =tail +2") output mail =newline else =outputfile(mail, "=hstdir/mailman/$list") output mail =newline fi fi
This is just one program example. You could write new scripts, for example to: monitor and report problems with Mailman list configurations, report failures to archive list messages, etc.
For more examples, see Samples.