Remove dependencies on morphlib and cliapp from deployment extensionsbaserock/adamcoldrick/remove-dependencies-v3

This is done by either copying some utility functions from morph
into writeexts.py, and using the `subprocess` module rather than
cliapp's runcmd and ssh_runcmd.

Note that this means that these extensions will require
"$definitions_checkout/extensions" in PYTHONPATH when they are
run.

This commit also updates VERSION to 5, since the PYTHONPATH
requirement means that this change is incompatible with old
versions of morph.

Change-Id: Iec6fa7e3c7219619ce55e18493e5c37c36e97816

1 files changed, 5 insertions, 5 deletions

diff --git a/extensions/virtualbox-ssh.check b/extensions/virtualbox-ssh.check
index a97f3294..e82d58a1 100755
--- a/extensions/virtualbox-ssh.check
+++ b/extensions/virtualbox-ssh.check
@@ -15,21 +15,21 @@
 
 '''Preparatory checks for Morph 'virtualbox-ssh' write extension'''
 
-import cliapp
 
-import morphlib.writeexts
+import writeexts
 
 
-class VirtualBoxPlusSshCheckExtension(morphlib.writeexts.WriteExtension):
+class VirtualBoxPlusSshCheckExtension(writeexts.WriteExtension):
     def process_args(self, args):
         if len(args) != 1:
-            raise cliapp.AppException('Wrong number of command line args')
+            raise writeexts.ExtensionError(
+                'Wrong number of command line args')
 
         self.require_btrfs_in_deployment_host_kernel()
 
         upgrade = self.get_environment_boolean('UPGRADE')
         if upgrade:
-            raise cliapp.AppException(
+            raise writeexts.ExtensionError(
                 'Use the `ssh-rsync` write extension to deploy upgrades to an '
                 'existing remote system.')