Public bug reported:

While looking to verify an apt_pipelining test-case fix I ran this:

% tox -e citest -- tree_run --verbose --os-name bionic --test
modules/apt_pipelining_disable --test modules/apt_pipelining_os --result
/tmp/result.yaml

During which, it would fail like this:

2019-03-31 16:13:11,743 - tests.cloud_tests - ERROR - stage part: build deb on 
system encountered error: Unexpected error while running command.
Command: /root/packages/bddeb -d
Exit code: 1
Reason: -

....

 ======================================================================       
ERROR: 
cloudinit.cmd.tests.test_query.TestQuery.test_handle_args_dumps_all_instance_data
----------------------------------------------------------------------       
Traceback (most recent call last):                                           
  File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/tests/test_query.py",
 line 153, in test_handle_args_dumps_all_instance_data
    self.assertEqual(0, query.handle_args('anyname', args))                  
  File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/query.py",
 line 124, in handle_args
    instance_data['userdata'] = util.load_file(user_data_fn)                 
  File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/util.py",
 line 1359, in load_file
    with open(fname, 'rb') as ifh:                                           
FileNotFoundError: [Errno 2] No such file or directory: 'ud'                 
                                                                             
======================================================================       
ERROR: 
cloudinit.cmd.tests.test_query.TestQuery.test_handle_args_list_keys_errors_when_varname_is_not_a_dict
----------------------------------------------------------------------       
Traceback (most recent call last):                                           
  File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/tests/test_query.py",
 line 255, in test_handle_args_list_keys_errors_when_varname_is_not_a_dict
    self.assertEqual(1, query.handle_args('anyname', args))                  
  File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/query.py",
 line 124, in handle_args
    instance_data['userdata'] = util.load_file(user_data_fn)                 
  File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/util.py",
 line 1359, in load_file
    with open(fname, 'rb') as ifh:                                           
FileNotFoundError: [Errno 2] No such file or directory: 'ud'                 
                                                                             
======================================================================       
ERROR: 
cloudinit.cmd.tests.test_query.TestQuery.test_handle_args_list_keys_sorts_nested_keys_when_varname
----------------------------------------------------------------------       
Traceback (most recent call last):                                           
  File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/tests/test_query.py",
 line 239, in test_handle_args_list_keys_sorts_nested_keys_when_varname
    self.assertEqual(0, query.handle_args('anyname', args))                  
  File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/query.py",
 line 124, in handle_args
    instance_data['userdata'] = util.load_file(user_data_fn)                 
  File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/util.py",
 line 1359, in load_file
    with open(fname, 'rb') as ifh:                                           
FileNotFoundError: [Errno 2] No such file or directory: 'ud'                 
                                                                             
======================================================================       
ERROR: 
cloudinit.cmd.tests.test_query.TestQuery.test_handle_args_list_keys_sorts_top_level_keys_when_no_varname
----------------------------------------------------------------------       
Traceback (most recent call last):                                           
  File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/tests/test_query.py",
 line 224, in test_handle_args_list_keys_sorts_top_level_keys_when_no_varname
    self.assertEqual(0, query.handle_args('anyname', args))                  
  File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/query.py",
 line 124, in handle_args
    instance_data['userdata'] = util.load_file(user_data_fn)                 
  File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/util.py",
 line 1359, in load_file
    with open(fname, 'rb') as ifh:                                           
FileNotFoundError: [Errno 2] No such file or directory: 'ud'                 

======================================================================       
ERROR: 
cloudinit.cmd.tests.test_query.TestQuery.test_handle_args_returns_nested_varname
----------------------------------------------------------------------       
Traceback (most recent call last):                                           
  File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/tests/test_query.py",
 line 180, in test_handle_args_returns_nested_varname
    self.assertEqual(0, query.handle_args('anyname', args))                  
  File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/query.py",
 line 124, in handle_args
    instance_data['userdata'] = util.load_file(user_data_fn)                 
  File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/util.py",
 line 1359, in load_file
    with open(fname, 'rb') as ifh:                                           
FileNotFoundError: [Errno 2] No such file or directory: 'ud'                 
                                                                             
======================================================================       
ERROR: 
cloudinit.cmd.tests.test_query.TestQuery.test_handle_args_returns_standardized_vars_to_top_level_aliases
----------------------------------------------------------------------       
Traceback (most recent call last):                                           
  File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/tests/test_query.py",
 line 209, in test_handle_args_returns_standardized_vars_to_top_level_aliases
    self.assertEqual(0, query.handle_args('anyname', args))                  
  File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/query.py",
 line 124, in handle_args
    instance_data['userdata'] = util.load_file(user_data_fn)                 
  File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/util.py",
 line 1359, in load_file
    with open(fname, 'rb') as ifh:                                           
FileNotFoundError: [Errno 2] No such file or directory: 'ud'                 
                                                                             
======================================================================       
ERROR: 
cloudinit.cmd.tests.test_query.TestQuery.test_handle_args_returns_top_level_varname
----------------------------------------------------------------------       
Traceback (most recent call last):                                           
  File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/tests/test_query.py",
 line 168, in test_handle_args_returns_top_level_varname
    self.assertEqual(0, query.handle_args('anyname', args))                  
  File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/query.py",
 line 124, in handle_args
    instance_data['userdata'] = util.load_file(user_data_fn)                 
  File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/util.py",
 line 1359, in load_file
    with open(fname, 'rb') as ifh:                                           
FileNotFoundError: [Errno 2] No such file or directory: 'ud'                 
                                                                             
----------------------------------------------------------------------       
Ran 1945 tests in 16.445s                                                    
                                                                             
FAILED (SKIP=12, errors=7)                                                   
Makefile:54: recipe for target 'unittest3' failed                            
make[2]: *** [unittest3] Error 1                                             
make[2]: Leaving directory 
'/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412'
debian/rules:21: recipe for target 'override_dh_auto_test' failed            
make[1]: *** [override_dh_auto_test] Error 2                                 
make[1]: Leaving directory 
'/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412'
debian/rules:8: recipe for target 'build' failed                             
make: *** [build] Error 2                                                    
dpkg-buildpackage: error: debian/rules build gave error exit status 2        
                Stderr: debuild: fatal error at line 1376:                   
                        dpkg-buildpackage -rfakeroot -d -us -uc failed

** Affects: cloud-init
     Importance: Undecided
         Status: New

** Description changed:

  While looking to verify an apt_pipelining test-case fix I ran this:
  
  % tox -e citest -- tree_run --verbose --os-name bionic --test
  modules/apt_pipelining_disable --test modules/apt_pipelining_os --result
  /tmp/result.yaml
  
  During which, it would fail like this:
  
  2019-03-31 16:13:11,743 - tests.cloud_tests - ERROR - stage part: build deb 
on system encountered error: Unexpected error while running command.
  Command: /root/packages/bddeb -d
  Exit code: 1
  Reason: -
  
  ....
  
-                         
======================================================================
-                         ERROR: 
cloudinit.cmd.tests.test_query.TestQuery.test_handle_args_dumps_all_instance_data
-                         
----------------------------------------------------------------------
-                         Traceback (most recent call last):
-                           File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/tests/test_query.py",
 line 153, in test_handle_args_dumps_all_instance_data
-                             self.assertEqual(0, query.handle_args('anyname', 
args))
-                           File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/query.py",
 line 124, in handle_args
-                             instance_data['userdata'] = 
util.load_file(user_data_fn)
-                           File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/util.py",
 line 1359, in load_file
-                             with open(fname, 'rb') as ifh:
-                         FileNotFoundError: [Errno 2] No such file or 
directory: 'ud'
-                         
-                         
======================================================================
-                         ERROR: 
cloudinit.cmd.tests.test_query.TestQuery.test_handle_args_list_keys_errors_when_varname_is_not_a_dict
-                         
----------------------------------------------------------------------
-                         Traceback (most recent call last):
-                           File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/tests/test_query.py",
 line 255, in test_handle_args_list_keys_errors_when_varname_is_not_a_dict
-                             self.assertEqual(1, query.handle_args('anyname', 
args))
-                           File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/query.py",
 line 124, in handle_args
-                             instance_data['userdata'] = 
util.load_file(user_data_fn)
-                           File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/util.py",
 line 1359, in load_file
-                             with open(fname, 'rb') as ifh:
-                         FileNotFoundError: [Errno 2] No such file or 
directory: 'ud'
-                         
-                         
======================================================================
-                         ERROR: 
cloudinit.cmd.tests.test_query.TestQuery.test_handle_args_list_keys_sorts_nested_keys_when_varname
-                         
----------------------------------------------------------------------
-                         Traceback (most recent call last):
-                           File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/tests/test_query.py",
 line 239, in test_handle_args_list_keys_sorts_nested_keys_when_varname
-                             self.assertEqual(0, query.handle_args('anyname', 
args))
-                           File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/query.py",
 line 124, in handle_args
-                             instance_data['userdata'] = 
util.load_file(user_data_fn)
-                           File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/util.py",
 line 1359, in load_file
-                             with open(fname, 'rb') as ifh:
-                         FileNotFoundError: [Errno 2] No such file or 
directory: 'ud'
-                         
-                         
======================================================================
-                         ERROR: 
cloudinit.cmd.tests.test_query.TestQuery.test_handle_args_list_keys_sorts_top_level_keys_when_no_varname
-                         
----------------------------------------------------------------------
-                         Traceback (most recent call last):
-                           File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/tests/test_query.py",
 line 224, in test_handle_args_list_keys_sorts_top_level_keys_when_no_varname
-                             self.assertEqual(0, query.handle_args('anyname', 
args))
-                           File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/query.py",
 line 124, in handle_args
-                             instance_data['userdata'] = 
util.load_file(user_data_fn)
-                           File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/util.py",
 line 1359, in load_file
-                             with open(fname, 'rb') as ifh:
-                         FileNotFoundError: [Errno 2] No such file or 
directory: 'ud'
-                         
-                         
======================================================================
-                         ERROR: 
cloudinit.cmd.tests.test_query.TestQuery.test_handle_args_returns_nested_varname
-                         
----------------------------------------------------------------------
-                         Traceback (most recent call last):
-                           File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/tests/test_query.py",
 line 180, in test_handle_args_returns_nested_varname
-                             self.assertEqual(0, query.handle_args('anyname', 
args))
-                           File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/query.py",
 line 124, in handle_args
-                             instance_data['userdata'] = 
util.load_file(user_data_fn)
-                           File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/util.py",
 line 1359, in load_file
-                             with open(fname, 'rb') as ifh:
-                         FileNotFoundError: [Errno 2] No such file or 
directory: 'ud'
-                         
-                         
======================================================================
-                         ERROR: 
cloudinit.cmd.tests.test_query.TestQuery.test_handle_args_returns_standardized_vars_to_top_level_aliases
-                         
----------------------------------------------------------------------
-                         Traceback (most recent call last):
-                           File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/tests/test_query.py",
 line 209, in test_handle_args_returns_standardized_vars_to_top_level_aliases
-                             self.assertEqual(0, query.handle_args('anyname', 
args))
-                           File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/query.py",
 line 124, in handle_args
-                             instance_data['userdata'] = 
util.load_file(user_data_fn)
-                           File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/util.py",
 line 1359, in load_file
-                             with open(fname, 'rb') as ifh:
-                         FileNotFoundError: [Errno 2] No such file or 
directory: 'ud'
-                         
-                         
======================================================================
-                         ERROR: 
cloudinit.cmd.tests.test_query.TestQuery.test_handle_args_returns_top_level_varname
-                         
----------------------------------------------------------------------
-                         Traceback (most recent call last):
-                           File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/tests/test_query.py",
 line 168, in test_handle_args_returns_top_level_varname
-                             self.assertEqual(0, query.handle_args('anyname', 
args))
-                           File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/query.py",
 line 124, in handle_args
-                             instance_data['userdata'] = 
util.load_file(user_data_fn)
-                           File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/util.py",
 line 1359, in load_file
-                             with open(fname, 'rb') as ifh:
-                         FileNotFoundError: [Errno 2] No such file or 
directory: 'ud'
-                         
-                         
----------------------------------------------------------------------
-                         Ran 1945 tests in 16.445s
-                         
-                         FAILED (SKIP=12, errors=7)
-                         Makefile:54: recipe for target 'unittest3' failed
-                         make[2]: *** [unittest3] Error 1
-                         make[2]: Leaving directory 
'/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412'
-                         debian/rules:21: recipe for target 
'override_dh_auto_test' failed
-                         make[1]: *** [override_dh_auto_test] Error 2
-                         make[1]: Leaving directory 
'/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412'
-                         debian/rules:8: recipe for target 'build' failed
-                         make: *** [build] Error 2
-                         dpkg-buildpackage: error: debian/rules build gave 
error exit status 2
-                 Stderr: debuild: fatal error at line 1376:
+  ======================================================================       
+ ERROR: 
cloudinit.cmd.tests.test_query.TestQuery.test_handle_args_dumps_all_instance_data
+ ----------------------------------------------------------------------       
+ Traceback (most recent call last):                                           
+   File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/tests/test_query.py",
 line 153, in test_handle_args_dumps_all_instance_data
+     self.assertEqual(0, query.handle_args('anyname', args))                  
+   File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/query.py",
 line 124, in handle_args
+     instance_data['userdata'] = util.load_file(user_data_fn)                 
+   File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/util.py",
 line 1359, in load_file
+     with open(fname, 'rb') as ifh:                                           
+ FileNotFoundError: [Errno 2] No such file or directory: 'ud'                 
+                                                                              
+ ======================================================================       
+ ERROR: 
cloudinit.cmd.tests.test_query.TestQuery.test_handle_args_list_keys_errors_when_varname_is_not_a_dict
+ ----------------------------------------------------------------------       
+ Traceback (most recent call last):                                           
+   File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/tests/test_query.py",
 line 255, in test_handle_args_list_keys_errors_when_varname_is_not_a_dict
+     self.assertEqual(1, query.handle_args('anyname', args))                  
+   File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/query.py",
 line 124, in handle_args
+     instance_data['userdata'] = util.load_file(user_data_fn)                 
+   File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/util.py",
 line 1359, in load_file
+     with open(fname, 'rb') as ifh:                                           
+ FileNotFoundError: [Errno 2] No such file or directory: 'ud'                 
+                                                                              
+ ======================================================================       
+ ERROR: 
cloudinit.cmd.tests.test_query.TestQuery.test_handle_args_list_keys_sorts_nested_keys_when_varname
+ ----------------------------------------------------------------------       
+ Traceback (most recent call last):                                           
+   File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/tests/test_query.py",
 line 239, in test_handle_args_list_keys_sorts_nested_keys_when_varname
+     self.assertEqual(0, query.handle_args('anyname', args))                  
+   File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/query.py",
 line 124, in handle_args
+     instance_data['userdata'] = util.load_file(user_data_fn)                 
+   File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/util.py",
 line 1359, in load_file
+     with open(fname, 'rb') as ifh:                                           
+ FileNotFoundError: [Errno 2] No such file or directory: 'ud'                 
+                                                                              
+ ======================================================================       
+ ERROR: 
cloudinit.cmd.tests.test_query.TestQuery.test_handle_args_list_keys_sorts_top_level_keys_when_no_varname
+ ----------------------------------------------------------------------       
+ Traceback (most recent call last):                                           
+   File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/tests/test_query.py",
 line 224, in test_handle_args_list_keys_sorts_top_level_keys_when_no_varname
+     self.assertEqual(0, query.handle_args('anyname', args))                  
+   File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/query.py",
 line 124, in handle_args
+     instance_data['userdata'] = util.load_file(user_data_fn)                 
+   File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/util.py",
 line 1359, in load_file
+     with open(fname, 'rb') as ifh:                                           
+ FileNotFoundError: [Errno 2] No such file or directory: 'ud'                 
+ 
+ ======================================================================       
+ ERROR: 
cloudinit.cmd.tests.test_query.TestQuery.test_handle_args_returns_nested_varname
+ ----------------------------------------------------------------------       
+ Traceback (most recent call last):                                           
+   File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/tests/test_query.py",
 line 180, in test_handle_args_returns_nested_varname
+     self.assertEqual(0, query.handle_args('anyname', args))                  
+   File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/query.py",
 line 124, in handle_args
+     instance_data['userdata'] = util.load_file(user_data_fn)                 
+   File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/util.py",
 line 1359, in load_file
+     with open(fname, 'rb') as ifh:                                           
+ FileNotFoundError: [Errno 2] No such file or directory: 'ud'                 
+                                                                              
+ ======================================================================       
+ ERROR: 
cloudinit.cmd.tests.test_query.TestQuery.test_handle_args_returns_standardized_vars_to_top_level_aliases
+ ----------------------------------------------------------------------       
+ Traceback (most recent call last):                                           
+   File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/tests/test_query.py",
 line 209, in test_handle_args_returns_standardized_vars_to_top_level_aliases
+     self.assertEqual(0, query.handle_args('anyname', args))                  
+   File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/query.py",
 line 124, in handle_args
+     instance_data['userdata'] = util.load_file(user_data_fn)                 
+   File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/util.py",
 line 1359, in load_file
+     with open(fname, 'rb') as ifh:                                           
+ FileNotFoundError: [Errno 2] No such file or directory: 'ud'                 
+                                                                              
+ ======================================================================       
+ ERROR: 
cloudinit.cmd.tests.test_query.TestQuery.test_handle_args_returns_top_level_varname
+ ----------------------------------------------------------------------       
+ Traceback (most recent call last):                                           
+   File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/tests/test_query.py",
 line 168, in test_handle_args_returns_top_level_varname
+     self.assertEqual(0, query.handle_args('anyname', args))                  
+   File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/query.py",
 line 124, in handle_args
+     instance_data['userdata'] = util.load_file(user_data_fn)                 
+   File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/util.py",
 line 1359, in load_file
+     with open(fname, 'rb') as ifh:                                           
+ FileNotFoundError: [Errno 2] No such file or directory: 'ud'                 
+                                                                              
+ ----------------------------------------------------------------------       
+ Ran 1945 tests in 16.445s                                                    
+                                                                              
+ FAILED (SKIP=12, errors=7)                                                   
+ Makefile:54: recipe for target 'unittest3' failed                            
+ make[2]: *** [unittest3] Error 1                                             
+ make[2]: Leaving directory 
'/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412'
+ debian/rules:21: recipe for target 'override_dh_auto_test' failed            
+ make[1]: *** [override_dh_auto_test] Error 2                                 
+ make[1]: Leaving directory 
'/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412'
+ debian/rules:8: recipe for target 'build' failed                             
+ make: *** [build] Error 2                                                    
+ dpkg-buildpackage: error: debian/rules build gave error exit status 2        
+                 Stderr: debuild: fatal error at line 1376:                   
                          dpkg-buildpackage -rfakeroot -d -us -uc failed

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https://bugs.launchpad.net/bugs/1822615

Title:
  cloud-tests tree_run/bddeb fail to build deb

Status in cloud-init:
  New

Bug description:
  While looking to verify an apt_pipelining test-case fix I ran this:

  % tox -e citest -- tree_run --verbose --os-name bionic --test
  modules/apt_pipelining_disable --test modules/apt_pipelining_os
  --result /tmp/result.yaml

  During which, it would fail like this:

  2019-03-31 16:13:11,743 - tests.cloud_tests - ERROR - stage part: build deb 
on system encountered error: Unexpected error while running command.
  Command: /root/packages/bddeb -d
  Exit code: 1
  Reason: -

  ....

   ======================================================================       
  ERROR: 
cloudinit.cmd.tests.test_query.TestQuery.test_handle_args_dumps_all_instance_data
  ----------------------------------------------------------------------       
  Traceback (most recent call last):                                           
    File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/tests/test_query.py",
 line 153, in test_handle_args_dumps_all_instance_data
      self.assertEqual(0, query.handle_args('anyname', args))                  
    File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/query.py",
 line 124, in handle_args
      instance_data['userdata'] = util.load_file(user_data_fn)                 
    File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/util.py",
 line 1359, in load_file
      with open(fname, 'rb') as ifh:                                           
  FileNotFoundError: [Errno 2] No such file or directory: 'ud'                 
                                                                               
  ======================================================================       
  ERROR: 
cloudinit.cmd.tests.test_query.TestQuery.test_handle_args_list_keys_errors_when_varname_is_not_a_dict
  ----------------------------------------------------------------------       
  Traceback (most recent call last):                                           
    File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/tests/test_query.py",
 line 255, in test_handle_args_list_keys_errors_when_varname_is_not_a_dict
      self.assertEqual(1, query.handle_args('anyname', args))                  
    File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/query.py",
 line 124, in handle_args
      instance_data['userdata'] = util.load_file(user_data_fn)                 
    File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/util.py",
 line 1359, in load_file
      with open(fname, 'rb') as ifh:                                           
  FileNotFoundError: [Errno 2] No such file or directory: 'ud'                 
                                                                               
  ======================================================================       
  ERROR: 
cloudinit.cmd.tests.test_query.TestQuery.test_handle_args_list_keys_sorts_nested_keys_when_varname
  ----------------------------------------------------------------------       
  Traceback (most recent call last):                                           
    File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/tests/test_query.py",
 line 239, in test_handle_args_list_keys_sorts_nested_keys_when_varname
      self.assertEqual(0, query.handle_args('anyname', args))                  
    File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/query.py",
 line 124, in handle_args
      instance_data['userdata'] = util.load_file(user_data_fn)                 
    File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/util.py",
 line 1359, in load_file
      with open(fname, 'rb') as ifh:                                           
  FileNotFoundError: [Errno 2] No such file or directory: 'ud'                 
                                                                               
  ======================================================================       
  ERROR: 
cloudinit.cmd.tests.test_query.TestQuery.test_handle_args_list_keys_sorts_top_level_keys_when_no_varname
  ----------------------------------------------------------------------       
  Traceback (most recent call last):                                           
    File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/tests/test_query.py",
 line 224, in test_handle_args_list_keys_sorts_top_level_keys_when_no_varname
      self.assertEqual(0, query.handle_args('anyname', args))                  
    File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/query.py",
 line 124, in handle_args
      instance_data['userdata'] = util.load_file(user_data_fn)                 
    File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/util.py",
 line 1359, in load_file
      with open(fname, 'rb') as ifh:                                           
  FileNotFoundError: [Errno 2] No such file or directory: 'ud'                 

  ======================================================================       
  ERROR: 
cloudinit.cmd.tests.test_query.TestQuery.test_handle_args_returns_nested_varname
  ----------------------------------------------------------------------       
  Traceback (most recent call last):                                           
    File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/tests/test_query.py",
 line 180, in test_handle_args_returns_nested_varname
      self.assertEqual(0, query.handle_args('anyname', args))                  
    File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/query.py",
 line 124, in handle_args
      instance_data['userdata'] = util.load_file(user_data_fn)                 
    File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/util.py",
 line 1359, in load_file
      with open(fname, 'rb') as ifh:                                           
  FileNotFoundError: [Errno 2] No such file or directory: 'ud'                 
                                                                               
  ======================================================================       
  ERROR: 
cloudinit.cmd.tests.test_query.TestQuery.test_handle_args_returns_standardized_vars_to_top_level_aliases
  ----------------------------------------------------------------------       
  Traceback (most recent call last):                                           
    File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/tests/test_query.py",
 line 209, in test_handle_args_returns_standardized_vars_to_top_level_aliases
      self.assertEqual(0, query.handle_args('anyname', args))                  
    File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/query.py",
 line 124, in handle_args
      instance_data['userdata'] = util.load_file(user_data_fn)                 
    File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/util.py",
 line 1359, in load_file
      with open(fname, 'rb') as ifh:                                           
  FileNotFoundError: [Errno 2] No such file or directory: 'ud'                 
                                                                               
  ======================================================================       
  ERROR: 
cloudinit.cmd.tests.test_query.TestQuery.test_handle_args_returns_top_level_varname
  ----------------------------------------------------------------------       
  Traceback (most recent call last):                                           
    File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/tests/test_query.py",
 line 168, in test_handle_args_returns_top_level_varname
      self.assertEqual(0, query.handle_args('anyname', args))                  
    File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/cmd/query.py",
 line 124, in handle_args
      instance_data['userdata'] = util.load_file(user_data_fn)                 
    File 
"/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412/cloudinit/util.py",
 line 1359, in load_file
      with open(fname, 'rb') as ifh:                                           
  FileNotFoundError: [Errno 2] No such file or directory: 'ud'                 
                                                                               
  ----------------------------------------------------------------------       
  Ran 1945 tests in 16.445s                                                    
                                                                               
  FAILED (SKIP=12, errors=7)                                                   
  Makefile:54: recipe for target 'unittest3' failed                            
  make[2]: *** [unittest3] Error 1                                             
  make[2]: Leaving directory 
'/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412'
  debian/rules:21: recipe for target 'override_dh_auto_test' failed            
  make[1]: *** [override_dh_auto_test] Error 2                                 
  make[1]: Leaving directory 
'/run/cloud-init/tmp/tmp2v5cncbz/cloud-init-18.5-57-g6c258412'
  debian/rules:8: recipe for target 'build' failed                             
  make: *** [build] Error 2                                                    
  dpkg-buildpackage: error: debian/rules build gave error exit status 2        
                  Stderr: debuild: fatal error at line 1376:                   
                          dpkg-buildpackage -rfakeroot -d -us -uc failed

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