Add experimental openstack support

This is untested and needs work. It depends on updating and adding
packages to nixpks that are not there yet.

nixops/backends/openstack.py

@@ -0,0 +1,114 @@
+# -*- coding: utf-8 -*-
+
+import os
+
+from nixops.backends import MachineDefinition, MachineState
+import nixops.util
+import shade
+
+
+class OpenStackServerDefinition(MachineDefinition):
+    """Definition of a trivial machine."""
+
+    @classmethod
+    def get_type(cls):
+        return "openstack"
+
+    def __init__(self, xml, config):
+        MachineDefinition.__init__(self, xml, config)
+        self.cloudname = config["cloudname"]
+
+
+class OpenStackServerState(MachineState):
+    """ State of an OpenStack machine."""
+
+    client_public_key = nixops.util.attr_property("openstack.clientPublicKey", None)
+    client_private_key = nixops.util.attr_property("openstack.clientPrivateKey", None)
+    public_ipv4 = nixops.util.attr_property("publicIpv4", None)
+    private_ipv4 = nixops.util.attr_property("privateIpv4", None)
+
+    @classmethod
+    def get_type(cls):
+        return "openstack"
+
+    def __init__(self, depl, name, id):
+        MachineState.__init__(self, depl, name, id)
+        """ Shade uses os-client-config for authentication information """
+        shade.simple_logging(debug=True)
+        cloudname = nixops.util.attr_property("openstack.cloud", None)
+        self.cloud = shade.openstack_clouds(name=cloudname)
+        self.image = None
+
+    def get_ssh_private_key_file(self):
+        return self._ssh_private_key_file or self.write_ssh_private_key(self.client_private_key)
+
+    def get_ssh_flags(self, *args, **kwargs):
+        super_flags = super(OpenStackServerState, self).get_ssh_flags(*args, **kwargs)
+        return super_flags + ["-o", "StrictHostKeyChecking=no",
+                              "-i", self.get_ssh_private_key_file()]
+
+    def _vm_id(self):
+        return "nixops-{0}-{1}".format(self.depl.uuid, self.name)
+
+    def create(self, defn, check, allow_reboot, allow_recreate):
+        self.log("starting openstack machine...")
+        assert isinstance(defn, OpenStackServerDefinition)
+        self.set_common_state(defn)
+
+        if not self.client_public_key:
+            (self.client_private_key, self.client_public_key) = nixops.util.create_key_pair()
+
+        if self.vm_id is None:
+            os.putenv("NIXOPS_LIBVIRTD_PUBKEY", self.client_public_key)
+            vm_id = self._vm_id()
+            base_image = self._logged_exec(
+                ["nix-build"] + self.depl._eval_flags(self.depl.nix_exprs) +
+                ["--arg", "checkConfigurationOptions", "false",
+                 "-A", "nodes.{0}.config.deployment.libvirtd.baseImage".format(self.name),
+                 "-o", "{0}/libvirtd-image-{1}".format(self.depl.tempdir, self.name)],
+                capture_stdout=True).rstrip()
+            self.image = self.cloud.create_image(vm_id, filename="{0}/disk.qcow2".format(base_image), wait=True)
+
+            os.chmod(self.disk_path, 0666)
+            self.vm_id = self._vm_id()
+        self.start()
+        return True
+
+    def has_really_fast_connection(self):
+        return True
+
+    def _is_running(self):
+        vm = self.cloud.get_server(self.vm_id)
+        if vm is None:
+            return False
+        else:
+            return True
+
+    def start(self):
+        self.log("starting...")
+        assert self.vm_id
+        if self._is_running():
+            self.private_ipv4 = shade.meta.get_server_private_ip(self.cloud.get_server(self.vm_id))
+            self.public_ipv4 = shade.meta.get_server_external_ipv4(self.cloud.get_server(self.vm_id))
+        else:
+            flavor = self.cloud.get_flavor_by_ram(512)
+            self.cloud.create_server(self.vm_id, image=self.image['id'], flavor=flavor['id'], wait=True, auto_ip=True)
+
+    def get_ssh_name(self):
+        assert self.private_ipv4
+        return self.private_ipv4
+
+    def stop(self):
+        assert self.vm_id
+        if self._is_running():
+            self.log_start("shutting down... ")
+            self.cloud.delete_server(self.vm_id)
+        else:
+            self.log("not running")
+
+    def destroy(self, wipe=False):
+        if not self.vm_id:
+            return True
+        self.log_start("destroying... ")
+        self.stop()
+        return True