format: remove option use_unique_local_address

The option use_unique_local_address was added in
de11308a but was already broken because
2 different names were used for the option:
 * use_unique_local_address_block
 * use_unique_local_address

There was a tentative fix in c09214cb
but the option name in slapos.cfg.example was never fixed.

CHANGES.rst

 Changes
 =======
 
+1.7.4 (unreleased)
+------------------
+ * format: remove use_unique_local_address_block option as it was never really used. User can add alocal IPv6 range on the interface before running "slapos node format".
+
 1.7.3 (2022-02-17)
 ------------------
  * runpromises: support software releases older than slapos 1.0.118

slapos.cfg.example

@@ -32,8 +32,6 @@ tap_ipv6 = true
 # You can choose any other local network which does not conflict with your
 # current machine configuration
 ipv4_local_network = 10.0.0.0/16
-# Change to true if you want slapos to use local-only IPv6
-use_unique_local_address = False
 
 # to enable, change to [firewall]
 [disabled-firewall]

slapos/cli/configure_local/__init__.py

@@ -140,8 +140,7 @@ def _generateSlaposNodeConfigurationFile(slapos_node_config_path, args):
         ('instance_root', args.slapos_instance_root),
         ('software_root', args.slapos_software_root),
         ('computer_xml', '%s/slapos.xml' % slapos_home),
-        ('log_file', '%s/log/slapos-node-format.log' % slapos_home),
-        ('use_unique_local_address_block', 'false')
+        ('log_file', '%s/log/slapos-node-format.log' % slapos_home)
     ]
 
     slapos_node_configuration_content = _replaceParameterValue(

slapos/format.py

@@ -506,15 +506,6 @@ class Computer(object):
       except ValueError:
         pass
 
-  def _addUniqueLocalAddressIpv6(self, interface_name):
-    """
-    Create a unique local address in the interface interface_name, so that
-    slapformat can build upon this.
-    See https://en.wikipedia.org/wiki/Unique_local_address.
-    """
-    command = 'ip address add dev %s fd00::1/64' % interface_name
-    callAndRead(command.split())
-
   @property
   def software_gid(self):
     """Return GID for self.software_user.
@@ -523,7 +514,7 @@ class Computer(object):
     effectively create the user and group."""
     return pwd.getpwnam(self.software_user)[3]
 
-  def format(self, alter_user=True, alter_network=True, create_tap=True, use_unique_local_address_block=False):
+  def format(self, alter_user=True, alter_network=True, create_tap=True):
     """
     Setup underlaying OS so it reflects this instance (``self``).
 
@@ -569,9 +560,6 @@ class Computer(object):
       if self.address is not None:
         self.interface.addIPv6Address(self.address, self.netmask)
 
-      if use_unique_local_address_block:
-        self._addUniqueLocalAddressIpv6(self.ipv6_interface or self.interface.name)
-
       if create_tap:
         if self.tap_gateway_interface:
           gateway_addr_dict = getIfaceAddressIPv4(self.tap_gateway_interface)
@@ -1409,8 +1397,7 @@ def do_format(conf):
 
   computer.format(alter_user=conf.alter_user,
                      alter_network=conf.alter_network,
-                     create_tap=conf.create_tap,
-                     use_unique_local_address_block=conf.use_unique_local_address_block)
+                     create_tap=conf.create_tap)
 
   if getattr(conf, 'certificate_repository_path', None):
     mkdir_p(conf.certificate_repository_path, mode=0o700)
@@ -1442,7 +1429,6 @@ class FormatConfig(object):
   tap_ipv6 = True
   tap_gateway_interface = ''
   ipv4_local_network = None
-  use_unique_local_address_block = False
 
   # User options
   alter_user = 'True' # modifiable by cmdline
@@ -1501,7 +1487,7 @@ class FormatConfig(object):
         raise UsageError(message)
 
     # Convert strings to booleans
-    for option in ['alter_network', 'alter_user', 'create_tap', 'create_tun', 'use_unique_local_address_block', 'tap_ipv6']:
+    for option in ['alter_network', 'alter_user', 'create_tap', 'create_tun', 'tap_ipv6']:
       attr = getattr(self, option)
       if isinstance(attr, str):
         if attr.lower() == 'true':

slapos/tests/test_slapformat.py

@@ -646,46 +646,6 @@ class TestComputer(SlapformatMixin):
       ],
       self.fakeCallAndRead.external_command_list)
 
-  def test_construct_use_unique_local_address_block(self):
-    """
-    Test that slapformat creates a unique local address in the interface.
-    """
-    global USER_LIST
-    USER_LIST = ['root']
-    computer = slapos.format.Computer('computer',
-      instance_root='/instance_root',
-      software_root='/software_root',
-      interface=slapos.format.Interface(
-        logger=self.logger, name='myinterface', ipv4_local_network='127.0.0.1/16'),
-      partition_list=[
-          slapos.format.Partition(
-            'partition', '/part_path', slapos.format.User('testuser'), [],
-            tap=slapos.format.Tap('tap')),
-        ])
-    global INTERFACE_DICT
-    INTERFACE_DICT['myinterface'] = {
-      socket.AF_INET: [{'addr': '192.168.242.77', 'broadcast': '127.0.0.1',
-        'netmask': '255.255.255.0'}],
-      socket.AF_INET6: [{'addr': '2a01:e35:2e27::e59c', 'netmask': 'ffff:ffff:ffff:ffff::'}]
-    }
-
-    computer.format(use_unique_local_address_block=True, alter_user=False, create_tap=False)
-    self.assertEqual([
-        "makedirs('/instance_root', 493)",
-        "makedirs('/software_root', 493)",
-        "chmod('/software_root', 493)",
-        "mkdir('/instance_root/partition', 488)",
-        "chmod('/instance_root/partition', 488)"
-      ],
-      self.test_result.bucket)
-    self.assertEqual([
-        'ip address add dev myinterface fd00::1/64',
-        'ip addr add ip/255.255.255.255 dev myinterface',
-        'ip addr add ip/ffff:ffff:ffff:ffff:: dev myinterface',
-        'ip -6 addr list myinterface'
-      ],
-      self.fakeCallAndRead.external_command_list)
-
 
 class TestFormatDump(SlapformatMixin):
   def setUp(self):