Add a simple backup server software release.

Request the service with the software type pullrdiffbackup.

Real backup are added by request a slave with required parameters:
  hostname="example.org" (just to make think readable for human)
  connection="user@0.0.0.0" (ssh connection string)
  include="/src /home" (space separated directory path to backup)
  frequency="0 0 * * *" (crontab like periodicity string)

Optional parameters are:
  exclude="/home/userA /home/userB" (space separated directory path to not backup)
  sudo="True" (if the server to backup contains a local backupagent_rdiff-backup script which is callable with sudo)

software/backupserver/instance-pullrdiffbackup.cfg.in

+{% set part_list = [] -%}
+{% set crontab_line_list = [] -%}
+###############################
+#
+# Instanciate dcron
+#
+###############################
+
+[directory]
+recipe = slapos.cookbook:mkdirectory
+etc = $${buildout:directory}/etc
+bin = $${buildout:directory}/bin
+srv = $${buildout:directory}/srv
+var = $${buildout:directory}/var
+log = $${:var}/log
+# scripts = $${:etc}/run
+services = $${:etc}/service
+cron-entries = $${:etc}/cron.d
+cron-lines = $${:etc}/cron.lines
+crontabs = $${:etc}/crontabs
+cronstamps = $${:etc}/cronstamps
+backup = $${:srv}/backup
+backupscript = $${:etc}/backup
+home = $${:etc}/home
+ssh = $${:home}/.ssh
+
+#################################
+# Cron service
+#################################
+[dcron-service]
+recipe = slapos.recipe.template
+url = ${template-dcron-service:output}
+output = $${directory:services}/crond
+mode = 0700
+logfile = $${directory:log}/crond.log
+
+#################################
+# Slave backup scripts and crontab
+#################################
+# Go throught slave list to set their configuration
+{% for slave_instance in slave_instance_list -%}
+{%   set slave_reference = slave_instance.get('slave_reference') -%}
+{%   set frequency = slave_instance.get('frequency', '') -%}
+{%   set hostname = slave_instance.get('hostname', '') -%}
+{%   set connection = slave_instance.get('connection', '') -%}
+{%   set include = slave_instance.get('include', '') -%}
+{%   set include_string = "' --include='".join(include.split(' ')) -%}
+{%   set exclude = slave_instance.get('exclude', '') -%}
+{%   set exclude_string = '' -%}
+{%   set sudo = slave_instance.get('sudo', 'False') -%}
+{%   set remote_schema = 'rdiff-backup --server --restrict-read-only / -- "$@"' -%}
+
+{%   if (exclude != '') -%}
+{%     set exclude_string = "' --exclude='".join(exclude.split(' ')) -%}
+{%     set exclude_string = "--exclude='" + exclude_string + "'" -%}
+{%   endif -%}
+
+{%   if (sudo == 'True') -%}
+{%     set remote_schema = 'sudo backupagent_rdiff-backup' -%}
+{%   endif -%}
+
+{%   if (frequency != '') and (hostname != '') and (connection != '') and (include != '') -%}
+
+[{{ slave_reference }}-backup-directory]
+recipe = slapos.cookbook:mkdirectory
+directory = $${directory:backup}/$${:_buildout_section_name_}
+
+[{{ slave_reference }}-backup-private_key]
+recipe = plone.recipe.command
+stop-on-error = true
+command = ${dropbear-output:keygen} -t $${:type} -s 2048 -f $${:key} 
+key = $${directory:ssh}/$${:_buildout_section_name_}
+location = $${:key}
+type = rsa
+
+[{{ slave_reference }}-backup-public_key]
+recipe = plone.recipe.command
+stop-on-error = true
+update-command = $${:command}
+command = ${coreutils-output:rm} -f $${:key} && ${dropbear-output:keygen} -y -f {{ '$${' ~ slave_reference }}-backup-private_key:key} | ${grep-output:grep} {{ '$${' ~ slave_reference }}-backup-private_key:type} > $${:key}
+key = {{ '$${' ~ slave_reference }}-backup-private_key:key}.pub
+location = $${:key}
+
+[{{ slave_reference }}-backup-check-public_key]
+recipe = plone.recipe.command
+stop-on-error = true
+update-command = $${:command}
+command = grep ssh-{{ '$${' ~ slave_reference }}-backup-private_key:type} {{ '$${' ~ slave_reference }}-backup-public_key:key}
+
+[{{ slave_reference }}-backup-read-public_key]
+recipe = slapos.cookbook:generate.password
+storage-path = {{ '$${' ~ slave_reference }}-backup-public_key:key}
+bytes = 8
+
+# Publish slave {{ slave_reference }} information
+[{{ slave_reference }}-backup-publish]
+recipe = slapos.cookbook:publish
+-slave-reference = {{ slave_reference }}
+authorized_key = {{ '$${' ~ slave_reference }}-backup-read-public_key:passwd}
+{%   do part_list.append("%s-backup-publish" % slave_reference) -%}
+
+[{{ slave_reference }}-backup-script]
+recipe = slapos.recipe.template
+url = ${template-backup-script:output}
+output = $${directory:backupscript}/$${:_buildout_section_name_}
+mode = 0700
+datadirectory = {{ '$${' ~ slave_reference }}-backup-directory:directory}
+sshkey = {{ '$${' ~ slave_reference }}-backup-private_key:key}
+connection = {{ connection }}
+hostname = {{ hostname }}
+include = {{ include_string }}
+exclude_string = {{ exclude_string }}
+remote_schema = {{ remote_schema }}
+
+[{{ slave_reference }}-backup-crontab-line]
+recipe = slapos.recipe.template
+url = ${template-crontab-line:output}
+output = $${directory:cron-lines}/$${:_buildout_section_name_}
+mode = 0600
+script = {{ '$${' ~ slave_reference }}-backup-script:output}
+frequency = {{ frequency }}
+{%   do crontab_line_list.append("$${%s-backup-crontab-line:output}" % slave_reference) -%}
+
+{%   endif -%}
+{% endfor -%}
+
+#################################
+# Generate crontab file
+#################################
+
+{% set crontab_line_list_string = " ".join(crontab_line_list) -%}
+[activate-crontab-file]
+# XXX File is never removed
+recipe = plone.recipe.command
+stop-on-error = true
+update-command = $${:command}
+command = ${coreutils-output:cat} ${template-crontab:output} {{ crontab_line_list_string }} | ${dcron-output:crontab} -c $${directory:crontabs} -
+
+
+# Add parts generated by template
+[buildout]
+parts =
+  dcron-service
+  activate-crontab-file
+{% for part in part_list -%}
+{{ '    %s' % part }}
+{% endfor -%}
+
+eggs-directory = ${buildout:eggs-directory}
+develop-eggs-directory = ${buildout:develop-eggs-directory}
+offline = true

software/backupserver/instance.cfg.in

+[buildout]
+parts =
+  switch-softwaretype
+
+eggs-directory = ${buildout:eggs-directory}
+develop-eggs-directory = ${buildout:develop-eggs-directory}
+offline = true
+
+[dynamic-template-pullrdiffbackup]
+recipe = slapos.recipe.template:jinja2
+template = ${template-pullrdiffbackup:output}
+rendered = $${buildout:parts-directory}/$${:_buildout_section_name_}/$${:filename}
+filename = instance-pullrdiffbackup.cfg
+extensions = jinja2.ext.do
+context =
+    key slave_instance_list instance-parameter:slave-instance-list
+
+[switch-softwaretype]
+recipe = slapos.cookbook:softwaretype
+default = $${:pullrdiffbackup}
+# pullrdiffbackup = ${template-pullrdiffbackup:output}
+pullrdiffbackup = $${dynamic-template-pullrdiffbackup:rendered}
+
+[slap-connection]
+# part to migrate to new - separated words
+computer-id = $${slap_connection:computer_id}
+partition-id = $${slap_connection:partition_id}
+server-url = $${slap_connection:server_url}
+software-release-url = $${slap_connection:software_release_url}
+key-file = $${slap_connection:key_file}
+cert-file = $${slap_connection:cert_file}
+
+# [slap-parameter]
+# slave-instance-list = []
+
+[instance-parameter]
+# Fetches parameters defined in SlapOS Master for this instance.
+# Always the same.
+recipe = slapos.cookbook:slapconfiguration.serialised
+computer = $${slap_connection:computer_id}
+partition = $${slap_connection:partition_id}
+url = $${slap_connection:server_url}
+key = $${slap_connection:key_file}
+cert = $${slap_connection:cert_file}

software/backupserver/template-backup-script.sh.in

+#!${dash-output:dash}
+
+# trap "echo Backing up failed for $${:hostname}" ERR
+
+export HOME=$${directory:home}
+
+set -e
+cd $${:datadirectory}
+${rdiff-backup-output:rdiff-backup} \
+  $${:exclude_string} \
+  --include='$${:include}' \
+  --exclude='**' \
+  --remote-schema '${dropbear-output:ssh} -T -y -i $${:sshkey} %s $${:remote_schema}' \
+  $${:connection}::/ ./
+
+# python scripts/verify_with_sudo.py ./ $${:connection}:/
+

software/backupserver/template-crontab-line.in

+# $${:_buildout_section_name_}
+$${:frequency} $${:script}

software/backupserver/template-crontab.in

+# min(0-59)  hours(0-23) day(1-31) month(1-12) dow(0-7)   command
+MAILTO=admins@erp5.org
+

software/backupserver/template-dcron-service.sh.in

+#!${dash-output:dash}
+# BEWARE: This file is operated by slapgrid
+# BEWARE: It will be overwritten automatically
+
+exec ${dcron-output:crond} \
+  -s $${directory:cron-entries} \
+  -c $${directory:crontabs} \
+  -t $${directory:cronstamps} \
+  -f -l 5 \
+  -L $${dcron-service:logfile}
+  # -M cron_simplelogger