caddy-frontend: Create "rotation" script

As some tools are not configurable with logrotate provide a script to
"rotate" files generated by those tools.
This script more or less follows logrotate behaviour:

 * moves rotated files to logrotate directory
 * compresses them with xz
 * have to be configured to keep only files for some days

software/caddy-frontend/buildout.hash.cfg

@@ -100,6 +100,10 @@ md5sum = 959f49437cffb096368f0b6434f06d3d
 filename = templates/validate-script.sh.in
 md5sum = 3174bf29f439d14e292f8719bba19a7a
 
+[template-rotate-script]
+filename = templates/rotate-script.sh.in
+md5sum = 8c150e1e6c993708d31936742f3a7302
+
 [caddyprofiledeps-setup]
 filename = setup.py
 md5sum = d9b6476bb0b36cf463fddb00d41dfbaa

software/caddy-frontend/common.cfg

@@ -9,6 +9,7 @@ extends =
   ../../component/rdiff-backup/buildout.cfg
   ../../component/trafficserver/buildout.cfg
   ../../component/6tunnel/buildout.cfg
+  ../../component/xz-utils/buildout.cfg
 
   ../../stack/nodejs.cfg
   ../../stack/caucase/buildout.cfg
@@ -113,12 +114,14 @@ sha256sum = ${coreutils:location}/bin/sha256sum
 kedifa = ${:bin_directory}/kedifa
 kedifa-updater = ${:bin_directory}/kedifa-updater
 kedifa-csr = ${:bin_directory}/kedifa-csr
+xz_location = ${xz-utils:location}
 
 monitor_template = ${monitor-template:output}
 template_cached_slave_virtualhost = ${template-cached-slave-virtualhost:target}
 template_caddy_frontend_configuration = ${template-caddy-frontend-configuration:target}
 template_graceful_script = ${template-graceful-script:target}
 template_validate_script = ${template-validate-script:target}
+template_rotate_script = ${template-rotate-script:target}
 template_caddy_lazy_script_call = ${template-caddy-lazy-script-call:target}
 template_default_slave_virtualhost = ${template-default-slave-virtualhost:target}
 template_empty = ${template-empty:target}
@@ -237,6 +240,10 @@ filename = storage.config.jinja2
 url = ${:_profile_base_location_}/templates/trafficserver/${:filename}
 filename = logging.config.jinja2
 
+[template-rotate-script]
+<=download-template
+filename = rotate-script.sh.in
+
 [template-caddy-lazy-script-call]
 <=download-template
 filename = apache-lazy-script-call.sh.in

software/caddy-frontend/templates/rotate-script.sh.in

+#!/bin/sh
+
+set -e
+
+LOG_DIR={{ log_dir }}
+LOGROTATE_DIR={{ rotate_dir }}
+PATTERN={{ pattern }}
+COMPRESS={{ xz_binary }}
+KEEP_DAYS={{ keep_days }}
+
+# Move out ${PATTERN} files
+find ${LOG_DIR} -maxdepth 1 -type f -name ${PATTERN} -exec mv {} ${LOGROTATE_DIR}/ \;
+
+# Compress 
+find ${LOGROTATE_DIR} -maxdepth 1 -type f -name ${PATTERN} -exec ${COMPRESS} -9 {} \;
+
+# Retent old files
+find ${LOGROTATE_DIR} -maxdepth 1 -type f -mtime +${KEEP_DAYS} -delete