Add storage_dir config field

On the [storage] section of the tahoe.cfg now there is a field
'storage_dir' where the path to the storage folder can be configured.

docs/configuration.rst

@@ -784,6 +784,14 @@ Storage Server Configuration
 
 .. _#390: https://tahoe-lafs.org/trac/tahoe-lafs/ticket/390
 
+``storage_dir = (string, optional)``
+
+    This specifies a storing directory.
+
+    The default value is the ``storage`` directory in the node's base directory
+    (i.e. ``BASEDIR/storage``), but it can be placed elsewhere. Relative paths
+    will be interpreted relative to the node's base directory.
+
 
 Running A Helper
 ================

src/allmydata/client.py

@@ -350,7 +350,8 @@ class _Client(node.Node, pollmixin.PollMixin):
                              "is not listening ('tub.port=' is empty)")
         readonly = self.get_config("storage", "readonly", False, boolean=True)
 
-        storedir = os.path.join(self.basedir, self.STOREDIR)
+        config_storedir = self.get_config("storage", "storage_dir", self.STOREDIR).decode('utf-8')
+        storedir = os.path.join(self.basedir, config_storedir)
 
         data = self.get_config("storage", "reserved_space", None)
         try:

src/allmydata/scripts/create_node.py

@@ -177,6 +177,7 @@ class CreateClientOptions(_CreateBaseOptions):
 class CreateNodeOptions(CreateClientOptions):
     optFlags = [
         ("no-storage", None, "Do not offer storage service to other nodes."),
+        ("storage-dir", "s",  None, "Path where the storage will be placed."),
     ] + TOR_FLAGS + I2P_FLAGS
 
     synopsis = "[options] [NODEDIR]"
@@ -320,6 +321,11 @@ def write_client_config(c, config):
     c.write("enabled = %s\n" % boolstr[storage_enabled])
     c.write("#readonly =\n")
     c.write("reserved_space = 1G\n")
+    storage_dir = config.get("storage-dir")
+    if storage_dir:
+        c.write("storage_dir = %s\n" % (storage_dir,))
+    else:
+        c.write("#storage_dir =\n")
     c.write("#expire.enabled =\n")
     c.write("#expire.mode =\n")
     c.write("\n")

src/allmydata/test/test_client.py

@@ -12,6 +12,7 @@ from allmydata.frontends.auth import NeedRootcapLookupScheme
 from allmydata import client
 from allmydata.storage_client import StorageFarmBroker
 from allmydata.util import base32, fileutil
+from allmydata.util.fileutil import abspath_expanduser_unicode
 from allmydata.interfaces import IFilesystemNode, IFileNode, \
      IImmutableFileNode, IMutableFileNode, IDirectoryNode
 from foolscap.api import flushEventualQueue
@@ -251,6 +252,18 @@ class Basic(testutil.ReallyEqualMixin, testutil.NonASCIIPathMixin, unittest.Test
                         "port = tcp:0:interface=127.0.0.1\n"))
         self.failUnlessRaises(NeedRootcapLookupScheme, client.create_client, basedir)
 
+    def test_storage_dir(self):
+        basedir = u"client.Basic.test_storage_dir"
+        os.mkdir(basedir)
+        fileutil.write(os.path.join(basedir, "tahoe.cfg"),
+                       BASECONFIG +
+                       "[storage]\n" +
+                       "enabled = true\n" +
+                       "storage_dir = myowndir\n")
+        c = client.Client(basedir)
+        self.failUnlessEqual(c.getServiceNamed("storage").storedir,
+                             os.path.join(abspath_expanduser_unicode(basedir), u"myowndir"))
+
     def _permute(self, sb, key):
         return [ s.get_longname() for s in sb.get_servers_for_psi(key) ]