Configure external data folder in partition if defined and return the list

If disk is mounted in folder like /data/data* and formated by slapformat
as /data/data*/slappart* for each partition, create a symlink
instance_root/DATA/data* to allow process of partition to write in
in the mounted disk.

slapos/recipe/slapconfiguration.py

@@ -32,6 +32,7 @@ import slapos.slap
 from slapos.recipe.librecipe import unwrap
 from ConfigParser import RawConfigParser
 from netaddr import valid_ipv4, valid_ipv6
+from slapos.util import mkdir_p
 
 class Recipe(object):
   """
@@ -61,6 +62,10 @@ class Recipe(object):
       Partition identifier.
       Example:
         ${slap-connection:partition-id}
+    storage-home
+      Path of folder configured for data storage
+      Example:
+        ${storage-configuration:storage-home}
 
   Output:
     slap-software-type
@@ -75,8 +80,20 @@ class Recipe(object):
       One of the IPv6 addresses.
     tap
       Set of TAP interfaces.
+    tap-network-information-dict
+      Dict of set of all TAP network information
+    tap-ipv4
+      ipv4 allowed for this TAP
+    tap-gateway
+      ipv4 of gateway interface of this TAP
+    tap-netmask
+      ipv4 netmask address of this TAP
+    tap-network
+      ipv4 network address of this TAP
     configuration
       Dict of all parameters.
+    storage-dict
+      Dict of partition data path when it is configured
     configuration.<key>
       One key per partition parameter.
       Partition parameter whose name cannot be represented unambiguously in
@@ -91,7 +108,8 @@ class Recipe(object):
   OPTCRE_match = RawConfigParser.OPTCRE.match
 
   def __init__(self, buildout, name, options):
-      parameter_dict = self.fetch_parameter_dict(options)
+      parameter_dict = self.fetch_parameter_dict(options,
+                                      buildout['buildout']['directory'])
 
       match = self.OPTCRE_match
       for key, value in parameter_dict.iteritems():
@@ -99,7 +117,7 @@ class Recipe(object):
               continue
           options['configuration.' + key] = value
 
-  def fetch_parameter_dict(self, options):
+  def fetch_parameter_dict(self, options, instance_root):
       slap = slapos.slap.slap()
       slap.initializeConnection(
           options['url'],
@@ -187,6 +205,21 @@ class Recipe(object):
       if route_network_set:
         options['tap-network'] = list(route_network_set)[0].encode('UTF-8')
 
+      storage_home = options.get('storage-home')
+      storage_dict = {}
+      if storage_home and os.path.exists(storage_home) and \
+                                  os.path.isdir(storage_home):
+        for filename in os.listdir(storage_home):
+          storage_path = os.path.join(storage_home, filename, 
+                                    options['slap-computer-partition-id'])
+          if os.path.exists(storage_path) and os.path.isdir(storage_path):
+            storage_link = os.path.join(instance_root, 'DATA', filename)
+            mkdir_p(os.path.join(instance_root, 'DATA'))
+            if not os.path.lexists(storage_link):
+              os.symlink(storage_path, storage_link)
+            storage_dict[filename] = storage_link
+      options['storage-dict'] = storage_dict
+
       options['tap'] = tap_set
       return self._expandParameterDict(options, parameter_dict)
 

slapos/recipe/softwaretype.py

@@ -34,6 +34,7 @@ import subprocess
 import slapos.slap
 import netaddr
 import logging
+import errno
 
 import zc.buildout
 
@@ -89,6 +90,20 @@ class Recipe:
       if name:
         return name
     raise AttributeError, "Not network interface found"
+  
+  def mkdir_p(self, path, mode=0700):
+    """
+    Creates a directory and its parents, if needed.
+    NB: If the directory already exists, it does not change its permission.
+    """
+
+    try:
+        os.makedirs(path, mode)
+    except OSError as exc:
+        if exc.errno == errno.EEXIST and os.path.isdir(path):
+            pass
+        else:
+            raise
 
   def install(self):
     slap = slapos.slap.slap()
@@ -98,6 +113,8 @@ class Recipe:
     server_url = slap_connection['server_url']
     key_file = slap_connection.get('key_file')
     cert_file = slap_connection.get('cert_file')
+    storage_home = self.buildout['storage-configuration'].get('storage-home')
+    instance_root = self.buildout['buildout']['directory']
     slap.initializeConnection(server_url, key_file, cert_file)
     self.computer_partition = slap.registerComputerPartition(
       computer_id,
@@ -162,6 +179,27 @@ class Recipe:
     # XXX: Needed for lxc. Use non standard API
     buildout.set('slap-connection', 'requested', self.computer_partition._requested_state)
 
+    # setup storage directory
+    buildout.add_section('storage-configuration')
+    buildout.set('storage-configuration', 'storage-home', storage_home)
+    if storage_home and os.path.exists(storage_home) and \
+                                  os.path.isdir(storage_home):
+      # Create folder instance_root/DATA/ if not exist
+      data_home = os.path.join(instance_root, 'DATA')
+      self.mkdir_p(data_home)
+      for filename in os.listdir(storage_home):
+        storage_path = os.path.join(storage_home, filename, computer_partition_id)
+        if os.path.exists(storage_path) and os.path.isdir(storage_path):
+          storage_link = os.path.join(data_home, filename)
+          if os.path.lexists(storage_link):
+            if not os.path.islink(storage_link):
+              raise zc.buildout.UserError(
+                  'Target %r already exists but is not a link' % storage_link)
+              #os.unlink(storage_link)
+          else:
+            os.symlink(storage_path, storage_link)
+          buildout.set('storage-configuration', filename, storage_link)
+
     work_directory = os.path.abspath(self.buildout['buildout'][
       'directory'])
     buildout_filename = os.path.join(work_directory,