erp5: define INSTANCE_HOME for zopes to allow defining emergency user if needed

When looking for emergency user, zope configuration is not fully loaded
yet, thus if we do not set INSTANCE_HOME at startup, it will be wrong.
With this change, setting an "access" file under erp5shared folder will
work properly

In the same time, fix HOME folder to not be in a tmp folder

slapos/recipe/generic_zope_zeo_client/__init__.py

@@ -105,10 +105,13 @@ class Recipe(GenericBaseRecipe):
     zope_environment = {
       'TMP': self.options['tmp-path'],
       'TMPDIR': self.options['tmp-path'],
-      'HOME': self.options['tmp-path'],
+      'HOME': self.options.get('home-path', self.options.get('tmp-path')),
       'PATH': self.options['bin-path'],
       'TZ': self.options['timezone'],
     }
+    instance_home = self.options.get("instancehome-path", None)
+    if instance_home:
+      zope_environment["INSTANCE_HOME"] = instance_home
 
     # longrequestlogger product which requires environment settings
     longrequest_logger_file = self.options.get('longrequest-logger-file', None)

stack/erp5/buildout.cfg

@@ -318,7 +318,7 @@ md5sum = 9670cf63099e2c520017a23defff51a4
 [template-zope]
 <= download-base
 filename = instance-zope.cfg.in
-md5sum = 995257c4d08365db7ac0d1b40936ef8b
+md5sum = 44c4aa068cffe2c1d8320d59e6d1c499
 link-binary =
   ${aspell:location}/bin/aspell
   ${dmtx-utils:location}/bin/dmtxwrite

stack/erp5/instance-zope.cfg.in

@@ -182,6 +182,8 @@ user = {{ dumps(slapparameter_dict['inituser-login']) }}
 password = {{ dumps(slapparameter_dict['inituser-password']) }}
 timezone = {{ dumps(slapparameter_dict['timezone']) }}
 tmp-path = ${directory:tmp}
+instancehome-path = ${directory:instance}
+home-path = ${buildout:directory}
 bin-path = ${directory:bin}:{{ parameter_dict['coreutils'] }}/bin
 site-zcml = ${directory:instance-etc}/site.zcml
 runzope-binary = ${preload-userhosts-runzope:rendered}