Use slapos.cookbook:readline recipe to get the ssh public key.

software/backupserver/instance-pullrdiffbackup.cfg.in

@@ -80,23 +80,18 @@ 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}
+# Insert as a beginning part, to ensure that all public keys are generated before trying to publish. This will reduce the number of slapgrid-cp run.
+{%   do part_list.insert(0, "%s-backup-public_key" % slave_reference) -%}
 
 [{{ slave_reference }}-backup-read-public_key]
-recipe = slapos.cookbook:generate.password
+recipe = slapos.cookbook:readline
 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 = {{ '$${' ~ slave_reference }}-backup-read-public_key:passwd}
+authorized_key = {{ '$${' ~ slave_reference }}-backup-read-public_key:readline}
 {%   do part_list.append("%s-backup-publish" % slave_reference) -%}
 
 [{{ slave_reference }}-backup-script]

software/backupserver/software.cfg

@@ -197,7 +197,7 @@ mode = 0644
 [template-pullrdiffbackup]
 recipe = slapos.recipe.template
 url = ${:_profile_base_location_}/instance-pullrdiffbackup.cfg.in
-md5sum = 62c236773dadecac11eb9a47dbca9351
+md5sum = b2a04e47c364b342e6036fd6518ced6a
 output = ${buildout:directory}/template-pullrdiffbackup.cfg
 mode = 0644
 
@@ -218,7 +218,7 @@ gunicorn = 17.5
 itsdangerous = 0.22
 meld3 = 0.6.10
 plone.recipe.command = 1.1
-slapos.cookbook = 0.78.3
+slapos.cookbook = 0.80
 slapos.recipe.build = 0.11.6
 slapos.recipe.cmmi = 0.1.1
 slapos.recipe.template = 2.4.2