Fix slurm email

By default slurm excepts `mail` to be installed. Since 5181add,
mail has been replaced by postfix and the binary `sendmail`.
mail and sendmail do not share the same flags, so this commit
introduces a wrapper named `slurm_mail` that takes arguments
from Slurm and convert the ones needed in something
sendmail can understand.

Fix #144

site/profile/files/slurm/slurm_mail

@@ -0,0 +1,8 @@
+#!/bin/bash
+
+email=${@: -1}
+subject=${@: 2:$#-2}
+cat << EOF | /usr/sbin/sendmail $email
+To: ${email}
+Subject: ${subject}
+EOF

site/profile/manifests/slurm.pp

@@ -310,6 +310,12 @@
   contain profile::slurm::base
   include profile::mail::server
 
+  file { '/usr/sbin/slurm_mail':
+    ensure => 'present',
+    source => 'puppet:///modules/profile/slurm/slurm_mail',
+    mode   => '0755',
+  }
+
   consul::service { 'slurmctld':
     port    => 6817,
     require => Tcp_conn_validator['consul'],

site/profile/templates/slurm/slurm.conf.epp

@@ -49,6 +49,7 @@ MpiDefault=pmi2
 ProctrackType=proctrack/cgroup
 TaskPlugin=task/cgroup
 PropagateResourceLimits=NONE
+MailProg=/usr/sbin/slurm_mail
 
 StateSaveLocation=/var/spool/slurm
 <% if $slurm_version == '19.05' { -%>