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 = 4aa5174de22135633f0fb4b41e29bbf9
+md5sum = affe6f105c10edee16abf7a3e9340cd7
 
 [template-balancer]
 filename = instance-balancer.cfg.in

stack/erp5/instance-zope.cfg.in

@@ -402,7 +402,7 @@ 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 = 8a774b677623c77c6ff0b88852fac643
+md5sum = 36a1dcb098d0d643cdaf988a58751aa6

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

@@ -53,12 +53,14 @@ rendered = ${logrotate-conf-parameter:logrotate-entries}/${: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 %}