stack logrotate: Add option to copytruncate log

copytruncate will truncate the original log file in place after creating a copy, instead of moving the old log file and optionally creating a new one.

stack/logrotate/buildout.hash.cfg

@@ -18,8 +18,8 @@ md5sum = 7c41026716d856bba7c1252b72adbf77
 
 [logrotate-entry-template]
 filename = logrotate_entry.in
-md5sum = ce6ccdd52148770149e6e7525ab71e80
+md5sum = 12a1822f83959677a3d344a5cc236e4a
 
 [template-logrotate-base]
 filename = instance-logrotate-base.cfg.in
-md5sum = 8a774b677623c77c6ff0b88852fac643
+md5sum = 37e20841ff7c377a0d638a2ffc74a6c9

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

@@ -59,6 +59,7 @@ context =
   key rotate_num :rotate-num
   key nocompress :nocompress
   key delaycompress :delaycompress
+  key truncate   :truncate
 post =
 pre =
 frequency = daily
@@ -66,6 +67,7 @@ rotate-num = 3650
 backup = ${logrotate-directory:logrotate-backup}
 nocompress =
 delaycompress = true
+truncate =
 
 [logrotate]
 recipe = slapos.cookbook:wrapper

stack/logrotate/logrotate_entry.in

@@ -10,6 +10,8 @@
   create
   olddir {{ backup }}
   missingok
+  {% if truncate %}nocreate
+  copytruncate{% endif %}
   {% if pre %}prerotate
     {{ pre }}
   endscript{% endif %}

[Jérome Perrin]

Maybe we can name the new option copytruncate (and not just truncate), to match the logrotate option name ?