zope4: Handle log rotation following Zope documentation.

SIGUSR2 for reopening log files was handled by ZServer and waitress does not
handle signals at all, so we could handle this signal but Zope official
documentation recommends using logrotate `copytruncate`:
  https://zope.readthedocs.io/en/4.7/zopebook/MaintainingZope.html#log-rotation
  https://github.com/zopefoundation/Zope/issues/809

stack/erp5/buildout.hash.cfg

@@ -86,7 +86,7 @@ md5sum = 0ac4b74436f554cd677f19275d18d880
 
 [template-zope]
 filename = instance-zope.cfg.in
-md5sum = 0451190711157fc204418662126d5cf8
+md5sum = 5ff5314df6a865104a4fdf621d0e620f
 
 [template-balancer]
 filename = instance-balancer.cfg.in

stack/erp5/instance-zope.cfg.in

@@ -417,7 +417,7 @@ config-maximum-delay = {{ slapparameter_dict["zope-longrequest-logger-maximum-de
 < = logrotate-entry-base
 name = {{ name }}
 log = {{ '${' ~ conf_parameter_name ~ ':event-log}' }} {{ '${' ~ conf_parameter_name ~ ':z2-log}' }} {{ '${' ~ conf_parameter_name ~ ':longrequest-logger-file}' }} {{ ' '.join(log_list) }}
-post = test ! -s {{ '${' ~ conf_parameter_name ~ ':pid-file}' }} || {{ bin_directory }}/slapos-kill --pidfile {{ '${' ~ conf_parameter_name ~ ':pid-file}' }} -s USR2
+copytruncate = true
 {% endmacro -%}
 
 {% for i in instance_index_list -%}

stack/logrotate/buildout.hash.cfg

@@ -18,8 +18,8 @@ md5sum = 7c41026716d856bba7c1252b72adbf77
 
 [logrotate-entry-template]
 filename = logrotate_entry.in
-md5sum = ce6ccdd52148770149e6e7525ab71e80
+md5sum = 02c1009f8e0dc371cfc1290afef72ec7
 
 [template-logrotate-base]
 filename = instance-logrotate-base.cfg.in
-md5sum = ed807da528595b7111c19e09056b01ce
+md5sum = 4e2baa1edd1d27831dda984769102a7c

stack/logrotate/instance-logrotate-base.cfg.in

@@ -53,12 +53,14 @@ output = ${logrotate-conf-parameter:logrotate-entries}/${:name}
 context =
   key backup :backup
   key log :log
+  key copytruncate :copytruncate
   key post :post
   key pre :pre
   key frequency :frequency
   key rotate_num :rotate-num
   key nocompress :nocompress
   key delaycompress :delaycompress
+copytruncate = false
 post =
 pre =
 frequency = daily

stack/logrotate/logrotate_entry.in

@@ -10,6 +10,7 @@
   create
   olddir {{ backup }}
   missingok
+  {% if copytruncate %}copytruncate{% endif %}
   {% if pre %}prerotate
     {{ pre }}
   endscript{% endif %}

[Jérome Perrin]

dead link in commit message https://zope.readthedocs.io/en/latest/zopebook/MaintainingZope.html#log-rotation