Check whether given filename is a special device

Accept only a special device file, otherwise throw an exception.

Change-Id: I23598b52d273091a877896968d17377373322cae
Closes-bug: #1492989

fuel_agent/manager.py

@@ -26,6 +26,7 @@ from fuel_agent.utils import artifact as au
 from fuel_agent.utils import build as bu
 from fuel_agent.utils import fs as fu
 from fuel_agent.utils import grub as gu
+from fuel_agent.utils import hardware as hw
 from fuel_agent.utils import lvm as lu
 from fuel_agent.utils import md as mu
 from fuel_agent.utils import partition as pu
@@ -322,6 +323,17 @@ class Manager(object):
                 processing.append(au.GunzipStream)
 
             LOG.debug('Appending TARGET processor: %s' % image.target_device)
+
+            error = None
+            if not os.path.exists(image.target_device):
+                error = "TARGET processor '{0}' does not exist."
+            elif not hw.is_block_device(image.target_device):
+                error = "TARGET processor '{0}' is not a block device."
+            if error:
+                error = error.format(image.target_device)
+                LOG.error(error)
+                raise errors.WrongDeviceError(error)
+
             processing.append(image.target_device)
 
             LOG.debug('Launching image processing chain')

fuel_agent/tests/test_manager.py

@@ -36,6 +36,16 @@ from fuel_agent.utils import utils
 CONF = cfg.CONF
 
 
+class FakeChain(object):
+    processors = []
+
+    def append(self, thing):
+        self.processors.append(thing)
+
+    def process(self):
+        pass
+
+
 class TestManager(unittest2.TestCase):
 
     @mock.patch('fuel_agent.drivers.nailgun.Nailgun.parse_image_meta',
@@ -488,6 +498,8 @@ class TestManager(unittest2.TestCase):
         self.assertRaises(errors.WrongPartitionSchemeError,
                           self.mgr.do_configdrive)
 
+    @mock.patch.object(manager.os.path, 'exists')
+    @mock.patch.object(hu, 'is_block_device')
     @mock.patch.object(utils, 'calculate_md5')
     @mock.patch('os.path.getsize')
     @mock.patch('yaml.load')
@@ -502,17 +514,10 @@ class TestManager(unittest2.TestCase):
     @mock.patch.object(hu, 'list_block_devices')
     def test_do_copyimage(self, mock_lbd, mock_u_ras, mock_u_e, mock_au_c,
                           mock_au_h, mock_au_l, mock_au_g, mock_fu_ef,
-                          mock_http_req, mock_yaml, mock_get_size, mock_md5):
+                          mock_http_req, mock_yaml, mock_get_size, mock_md5,
-
+                          mock_ibd, mock_os_path):
-        class FakeChain(object):
+        mock_os_path.return_value = True
-            processors = []
+        mock_ibd.return_value = True
-
-            def append(self, thing):
-                self.processors.append(thing)
-
-            def process(self):
-                pass
-
         mock_lbd.return_value = test_nailgun.LIST_BLOCK_DEVICES_SAMPLE
         mock_au_c.return_value = FakeChain()
         self.mgr.do_configdrive()
@@ -538,6 +543,67 @@ class TestManager(unittest2.TestCase):
             mock.call('ext4', '/dev/mapper/os-root')]
         self.assertEqual(mock_fu_ef_expected_calls, mock_fu_ef.call_args_list)
 
+    @mock.patch.object(manager.os.path, 'exists')
+    @mock.patch.object(hu, 'is_block_device')
+    @mock.patch.object(utils, 'calculate_md5')
+    @mock.patch('os.path.getsize')
+    @mock.patch('yaml.load')
+    @mock.patch.object(utils, 'init_http_request')
+    @mock.patch.object(fu, 'extend_fs')
+    @mock.patch.object(au, 'GunzipStream')
+    @mock.patch.object(au, 'LocalFile')
+    @mock.patch.object(au, 'HttpUrl')
+    @mock.patch.object(au, 'Chain')
+    @mock.patch.object(utils, 'execute')
+    @mock.patch.object(utils, 'render_and_save')
+    @mock.patch.object(hu, 'list_block_devices')
+    def test_do_copyimage_target_doesnt_exist(self, mock_lbd, mock_u_ras,
+                                              mock_u_e, mock_au_c, mock_au_h,
+                                              mock_au_l, mock_au_g, mock_fu_ef,
+                                              mock_http_req, mock_yaml,
+                                              mock_get_size, mock_md5,
+                                              mock_ibd, mock_os_path):
+        mock_os_path.return_value = False
+        mock_ibd.return_value = True
+        mock_lbd.return_value = test_nailgun.LIST_BLOCK_DEVICES_SAMPLE
+        mock_au_c.return_value = FakeChain()
+        self.mgr.do_configdrive()
+        with self.assertRaisesRegexp(errors.WrongDeviceError,
+                                     'TARGET processor .* does not exist'):
+            self.mgr.do_copyimage()
+
+    @mock.patch.object(manager.os.path, 'exists')
+    @mock.patch.object(hu, 'is_block_device')
+    @mock.patch.object(utils, 'calculate_md5')
+    @mock.patch('os.path.getsize')
+    @mock.patch('yaml.load')
+    @mock.patch.object(utils, 'init_http_request')
+    @mock.patch.object(fu, 'extend_fs')
+    @mock.patch.object(au, 'GunzipStream')
+    @mock.patch.object(au, 'LocalFile')
+    @mock.patch.object(au, 'HttpUrl')
+    @mock.patch.object(au, 'Chain')
+    @mock.patch.object(utils, 'execute')
+    @mock.patch.object(utils, 'render_and_save')
+    @mock.patch.object(hu, 'list_block_devices')
+    def test_do_copyimage_target_not_block_device(self, mock_lbd, mock_u_ras,
+                                                  mock_u_e, mock_au_c,
+                                                  mock_au_h, mock_au_l,
+                                                  mock_au_g, mock_fu_ef,
+                                                  mock_http_req, mock_yaml,
+                                                  mock_get_size, mock_md5,
+                                                  mock_ibd, mock_os_path):
+        mock_os_path.return_value = True
+        mock_ibd.return_value = False
+        mock_lbd.return_value = test_nailgun.LIST_BLOCK_DEVICES_SAMPLE
+        mock_au_c.return_value = FakeChain()
+        self.mgr.do_configdrive()
+        msg = 'TARGET processor .* is not a block device'
+        with self.assertRaisesRegexp(errors.WrongDeviceError, msg):
+            self.mgr.do_copyimage()
+
+    @mock.patch.object(manager.os.path, 'exists')
+    @mock.patch.object(hu, 'is_block_device')
     @mock.patch.object(utils, 'calculate_md5')
     @mock.patch('os.path.getsize')
     @mock.patch('yaml.load')
@@ -553,17 +619,10 @@ class TestManager(unittest2.TestCase):
     def test_do_copyimage_md5_matches(self, mock_lbd, mock_u_ras, mock_u_e,
                                       mock_au_c, mock_au_h, mock_au_l,
                                       mock_au_g, mock_fu_ef, mock_http_req,
-                                      mock_yaml, mock_get_size, mock_md5):
+                                      mock_yaml, mock_get_size, mock_md5,
-
+                                      mock_ibd, mock_os_path):
-        class FakeChain(object):
+        mock_os_path.return_value = True
-            processors = []
+        mock_ibd.return_value = True
-
-            def append(self, thing):
-                self.processors.append(thing)
-
-            def process(self):
-                pass
-
         mock_get_size.return_value = 123
         mock_md5.side_effect = ['fakemd5', 'really_fakemd5', 'fakemd5']
         mock_lbd.return_value = test_nailgun.LIST_BLOCK_DEVICES_SAMPLE
@@ -578,6 +637,8 @@ class TestManager(unittest2.TestCase):
                               mock.call('/dev/sda7', 123)]
         self.assertEqual(expected_md5_calls, mock_md5.call_args_list)
 
+    @mock.patch.object(hu, 'is_block_device')
+    @mock.patch.object(manager.os.path, 'exists')
     @mock.patch.object(utils, 'calculate_md5')
     @mock.patch('os.path.getsize')
     @mock.patch('yaml.load')
@@ -593,17 +654,10 @@ class TestManager(unittest2.TestCase):
     def test_do_copyimage_md5_mismatch(self, mock_lbd, mock_u_ras, mock_u_e,
                                        mock_au_c, mock_au_h, mock_au_l,
                                        mock_au_g, mock_fu_ef, mock_http_req,
-                                       mock_yaml, mock_get_size, mock_md5):
+                                       mock_yaml, mock_get_size, mock_md5,
-
+                                       mock_os_path, mock_ibd):
-        class FakeChain(object):
+        mock_os_path.return_value = True
-            processors = []
+        mock_ibd.return_value = True
-
-            def append(self, thing):
-                self.processors.append(thing)
-
-            def process(self):
-                pass
-
         mock_get_size.return_value = 123
         mock_md5.side_effect = ['fakemd5', 'really_fakemd5', 'fakemd5']
         mock_lbd.return_value = test_nailgun.LIST_BLOCK_DEVICES_SAMPLE

fuel_agent/utils/hardware.py

@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import os
+import stat
 
 from fuel_agent import errors
 from fuel_agent.openstack.common import log as logging
@@ -245,6 +246,12 @@ def extrareport(dev):
     return spec
 
 
+def is_block_device(self, filepath):
+    """Check whether `filepath` is a block device."""
+    mode = os.stat(filepath).st_mode
+    return stat.S_ISBLK(mode)
+
+
 def get_block_devices_from_udev_db():
     devs = []
     output = utils.execute('udevadm', 'info', '--export-db')[0]