Allow the user to choose either ietadm or tgtadm (lp:819997)

Also, refactor ietadm/tgtadm calls out into helper classes. Add a new
TargetAdmin abstract base class and implement it using ietadm and
tgtadm. This cleans up the code greatly and gets us some code reuse.

(Based on a patch by Chuck Short <zulcss@ubuntu.com>)

Change-Id: I1c0064e5d35483a6c4059cfc61a484f5f576b2da

nova/tests/test_iscsi.py

@@ -0,0 +1,116 @@
+# vim: tabstop=4 shiftwidth=4 softtabstop=4
+
+# Copyright 2011 Red Hat, Inc.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+import string
+
+from nova import test
+from nova.volume import iscsi
+
+
+class TargetAdminTestCase(object):
+
+    def setUp(self):
+        self.cmds = []
+
+        self.tid = 1
+        self.target_name = 'iqn.2011-09.org.foo.bar:blaa'
+        self.lun = 10
+        self.path = '/foo/bar/blaa'
+
+        self.script_template = None
+
+    def get_script_params(self):
+        return {'tid': self.tid,
+                'target_name': self.target_name,
+                'lun': self.lun,
+                'path': self.path}
+
+    def get_script(self):
+        return self.script_template % self.get_script_params()
+
+    def fake_execute(self, *cmd, **kwargs):
+        self.cmds.append(string.join(cmd))
+        return "", None
+
+    def clear_cmds(self):
+        cmds = []
+
+    def verify_cmds(self, cmds):
+        self.assertEqual(len(cmds), len(self.cmds))
+        for a, b in zip(cmds, self.cmds):
+            self.assertEqual(a, b)
+
+    def verify(self):
+        script = self.get_script()
+        cmds = []
+        for line in script.split('\n'):
+            if not line.strip():
+                continue
+            cmds.append(line)
+        self.verify_cmds(cmds)
+
+    def run_commands(self):
+        tgtadm = iscsi.get_target_admin()
+        tgtadm.set_execute(self.fake_execute)
+        tgtadm.new_target(self.target_name, self.tid)
+        tgtadm.show_target(self.tid)
+        tgtadm.new_logicalunit(self.tid, self.lun, self.path)
+        tgtadm.delete_logicalunit(self.tid, self.lun)
+        tgtadm.delete_target(self.tid)
+
+    def test_target_admin(self):
+        self.clear_cmds()
+        self.run_commands()
+        self.verify()
+
+
+class TgtAdmTestCase(test.TestCase, TargetAdminTestCase):
+
+    def setUp(self):
+        super(TgtAdmTestCase, self).setUp()
+        TargetAdminTestCase.setUp(self)
+        self.flags(iscsi_helper='tgtadm')
+        self.script_template = """
+tgtadm --op new --lld=iscsi --mode=target --tid=%(tid)s \
+--targetname=%(target_name)s
+tgtadm --op bind --lld=iscsi --mode=target --initiator-address=ALL \
+--tid=%(tid)s
+tgtadm --op show --lld=iscsi --mode=target --tid=%(tid)s
+tgtadm --op new --lld=iscsi --mode=logicalunit --tid=%(tid)s --lun=%(lun)d \
+--backing-store=%(path)s
+tgtadm --op delete --lld=iscsi --mode=logicalunit --tid=%(tid)s --lun=%(lun)d
+tgtadm --op delete --lld=iscsi --mode=target --tid=%(tid)s
+"""
+
+    def get_script_params(self):
+        params = super(TgtAdmTestCase, self).get_script_params()
+        params['lun'] += 1
+        return params
+
+
+class IetAdmTestCase(test.TestCase, TargetAdminTestCase):
+
+    def setUp(self):
+        super(IetAdmTestCase, self).setUp()
+        TargetAdminTestCase.setUp(self)
+        self.flags(iscsi_helper='ietadm')
+        self.script_template = """
+ietadm --op new --tid=%(tid)s --params Name=%(target_name)s
+ietadm --op show --tid=%(tid)s
+ietadm --op new --tid=%(tid)s --lun=%(lun)d --params Path=%(path)s,Type=fileio
+ietadm --op delete --tid=%(tid)s --lun=%(lun)d
+ietadm --op delete --tid=%(tid)s
+"""

nova/tests/test_volume.py

@@ -270,7 +270,7 @@ class DriverTestCase(test.TestCase):
         def _fake_execute(_command, *_args, **_kwargs):
             """Fake _execute."""
             return self.output, None
-        self.volume.driver._execute = _fake_execute
+        self.volume.driver.set_execute(_fake_execute)
 
         log = logging.getLogger()
         self.stream = cStringIO.StringIO()
@@ -333,12 +333,10 @@ class ISCSITestCase(DriverTestCase):
         """No log message when all the processes are running."""
         volume_id_list = self._attach_volume()
 
-        self.mox.StubOutWithMock(self.volume.driver, '_execute')
+        self.mox.StubOutWithMock(self.volume.driver.tgtadm, 'show_target')
         for i in volume_id_list:
             tid = db.volume_get_iscsi_target_num(self.context, i)
-            self.volume.driver._execute("ietadm", "--op", "show",
+            self.volume.driver.tgtadm.show_target(tid)
-                                        "--tid=%(tid)d" % locals(),
-                                        run_as_root=True)
 
         self.stream.truncate(0)
         self.mox.ReplayAll()
@@ -354,11 +352,9 @@ class ISCSITestCase(DriverTestCase):
         volume_id_list = self._attach_volume()
 
         tid = db.volume_get_iscsi_target_num(self.context, volume_id_list[0])
-        self.mox.StubOutWithMock(self.volume.driver, '_execute')
+        self.mox.StubOutWithMock(self.volume.driver.tgtadm, 'show_target')
-        self.volume.driver._execute("ietadm", "--op", "show",
+        self.volume.driver.tgtadm.show_target(tid).AndRaise(
-                                    "--tid=%(tid)d" % locals(),
+            exception.ProcessExecutionError())
-                                    run_as_root=True).AndRaise(
-                                            exception.ProcessExecutionError())
 
         self.mox.ReplayAll()
         self.assertRaises(exception.ProcessExecutionError,