tests: Enable the NoCloud KVM platform

The NoCloud KVM platform includes:

  * Downloads daily Ubuntu images using streams and store in
    /srv/images
  * Image customization, if required, is done using
    mount-image-callback otherwise image is untouched
  * Launches KVM via the xkvm script, a wrapper around
    qemu-system, and sets custom port for SSH
  * Generation and inject an SSH (RSA 4096) key pair to use for
    communication with the guest to collect test artifacts
  * Add method to produce safe shell strings by base64 encoding
    the command

Additional Changes:

  * Set default backend to use LXD
  * Verify not running script as root in order to prevent images
    from becoming owned by root
  * Removed extra quotes around that were added when collecting
    the cloud-init version from the image
  * Added info about each release as previously the lxd backend
    was able to query that information from pylxd image info,
    however, other backends will not be able to obtain the same
    information as easily

1 files changed, 88 insertions, 0 deletions

diff --git a/tests/cloud_tests/images/nocloudkvm.py b/tests/cloud_tests/images/nocloudkvm.py
new file mode 100644
index 00000000..a7af0e59
--- /dev/null
+++ b/tests/cloud_tests/images/nocloudkvm.py
@@ -0,0 +1,88 @@
+# This file is part of cloud-init. See LICENSE file for license information.
+
+"""NoCloud KVM Image Base Class."""
+
+from tests.cloud_tests.images import base
+from tests.cloud_tests.snapshots import nocloudkvm as nocloud_kvm_snapshot
+
+
+class NoCloudKVMImage(base.Image):
+    """NoCloud KVM backed image."""
+
+    platform_name = "nocloud-kvm"
+
+    def __init__(self, platform, config, img_path):
+        """Set up image.
+
+        @param platform: platform object
+        @param config: image configuration
+        @param img_path: path to the image
+        """
+        self.modified = False
+        self._instance = None
+        self._img_path = img_path
+
+        super(NoCloudKVMImage, self).__init__(platform, config)
+
+    @property
+    def instance(self):
+        """Returns an instance of an image."""
+        if not self._instance:
+            if not self._img_path:
+                raise RuntimeError()
+
+            self._instance = self.platform.create_image(
+                self.properties, self.config, self.features, self._img_path,
+                image_desc=str(self), use_desc='image-modification')
+        return self._instance
+
+    @property
+    def properties(self):
+        """Dictionary containing: 'arch', 'os', 'version', 'release'."""
+        return {
+            'arch': self.config['arch'],
+            'os': self.config['family'],
+            'release': self.config['release'],
+            'version': self.config['version'],
+        }
+
+    def execute(self, *args, **kwargs):
+        """Execute command in image, modifying image."""
+        return self.instance.execute(*args, **kwargs)
+
+    def push_file(self, local_path, remote_path):
+        """Copy file at 'local_path' to instance at 'remote_path'."""
+        return self.instance.push_file(local_path, remote_path)
+
+    def run_script(self, *args, **kwargs):
+        """Run script in image, modifying image.
+
+        @return_value: script output
+        """
+        return self.instance.run_script(*args, **kwargs)
+
+    def snapshot(self):
+        """Create snapshot of image, block until done."""
+        if not self._img_path:
+            raise RuntimeError()
+
+        instance = self.platform.create_image(
+            self.properties, self.config, self.features,
+            self._img_path, image_desc=str(self), use_desc='snapshot')
+
+        return nocloud_kvm_snapshot.NoCloudKVMSnapshot(
+            self.platform, self.properties, self.config,
+            self.features, instance)
+
+    def destroy(self):
+        """Unset path to signal image is no longer used.
+
+        The removal of the images and all other items is handled by the
+        framework. In some cases we want to keep the images, so let the
+        framework decide whether to keep or destroy everything.
+        """
+        self._img_path = None
+        self._instance.destroy()
+        super(NoCloudKVMImage, self).destroy()
+
+# vi: ts=4 expandtab