erp5: add webrunner import script for zeo instance.

stack/erp5/buildout.cfg

@@ -301,7 +301,7 @@ md5sum = 28db329061ae863367a76951b9b1152c
 [template-zeo]
 < = download-base
 filename = instance-zeo.cfg.in
-md5sum = 5b8639e77217d4fbdee19338a25b6128
+md5sum = cc91f5a4778153dc1d34398b9a80150d
 
 [template-zope]
 < = download-base

stack/erp5/instance-zeo.cfg.in

@@ -125,12 +125,57 @@ recipe = collective.recipe.template
 input = inline: {{ default_zodb_path }}/**
 output = ${directory:srv}/exporter.exclude
 
+[{{ section("resiliency-after-import-script") }}]
+# Generate after import script used by importer instance of webrunner
+recipe = collective.recipe.template
+input = inline: #!/bin/sh
+  # DO NOT RUN THIS SCRIPT ON PRODUCTION INSTANCE
+  # OR ZODB DATA WILL BE ERASED.
+
+  # This script will restore the repozo backup to the real
+  # zodb location. It is launched by the clone (importer) instance of webrunner
+  # in the end of the import script.
+
+  # Depending on the output, it will create a file containing
+  # the status of the restoration (success or failure).
+  zodb_directory="${directory:zodb}"
+  zodb_backup_directory="{{ default_backup_path }}"
+  repozo="${tidstorage:repozo-binary}"
+  EXIT_CODE=0
+  {% for family, zodb in zodb_dict.iteritems() -%}
+  {%   for name, zodb in zodb -%}
+  {%   set zeo_section_name = 'zeo-' ~ family %}
+  storage_name="{{ name }}"
+  zodb_path="$storage_name.fs"
+  pid_file={{ "${" ~ zeo_section_name ~ ":pid-path}" }}
+  if [ -e "$pid_file" ]; then
+    pid=$(cat $pid_file) > /dev/null 2>&1
+    if kill -0 "$pid"; then
+      echo "Zeo is already running with pid $pid. Aborting."
+      exit 1
+    fi
+  fi
+  echo "Removing $zodb_path..."
+  echo "Restoring $storage_name into $zodb_path..."
+  $repozo --recover --output="$zodb_directory/$zodb_path" --repository="$zodb_backup_directory/$storage_name"
+  CURRENT_EXIT_CODE=$?
+  if [ ! "$CURRENT_EXIT_CODE"="0" ]; then
+    EXIT_CODE="$CURRENT_EXIT_CODE"
+    echo "$storage_name Backup restoration failed."
+  fi
+  {%   endfor -%}
+  {% endfor -%}
+  exit $EXIT_CODE
+output = ${directory:srv}/runner-import-restore
+mode = 755
+
 [directory]
 recipe = slapos.cookbook:mkdirectory
 bin = ${buildout:directory}/bin
 etc = ${buildout:directory}/etc
 services = ${:etc}/run
 promises = ${:etc}/promise
+srv = ${buildout:directory}/srv
 var = ${buildout:directory}/var
 log = ${:var}/log
 run = ${:var}/run

[Jérome Perrin]

[tidstorage] is optional section that won't get generated when using backup-periodicity: never. Maybe this whole section can be skipped if we configure no zeo backup.