// MakeConfig creates a functional environConfig for a test.
func MakeConfig(c *gc.C, attrs testing.Attrs) *environConfig {
	cfg, err := config.New(config.NoDefaults, attrs)
	c.Assert(err, gc.IsNil)
	env, err := environs.Prepare(cfg, testing.Context(c), configstore.NewMem())
	c.Assert(err, gc.IsNil)
	return env.(*joyentEnviron).Ecfg()
}

func (*OpenSuite) TestPrepareGeneratesDifferentAdminSecrets(c *gc.C) {
	baselineAttrs := dummy.SampleConfig().Merge(testing.Attrs{
		"state-server": false,
		"name":         "erewhemos",
	}).Delete(
		"admin-secret",
	)
	cfg, err := config.New(config.NoDefaults, baselineAttrs)
	c.Assert(err, gc.IsNil)

	ctx := testing.Context(c)
	env0, err := environs.Prepare(cfg, ctx, configstore.NewMem())
	c.Assert(err, gc.IsNil)
	adminSecret0 := env0.Config().AdminSecret()
	c.Assert(adminSecret0, gc.HasLen, 32)
	c.Assert(adminSecret0, gc.Matches, "^[0-9a-f]*$")

	env1, err := environs.Prepare(cfg, ctx, configstore.NewMem())
	c.Assert(err, gc.IsNil)
	adminSecret1 := env1.Config().AdminSecret()
	c.Assert(adminSecret1, gc.HasLen, 32)
	c.Assert(adminSecret1, gc.Matches, "^[0-9a-f]*$")

	c.Assert(adminSecret1, gc.Not(gc.Equals), adminSecret0)
}

func (t *LiveTests) TestBootstrapWithDefaultSeries(c *gc.C) {
	if !t.HasProvisioner {
		c.Skip("HasProvisioner is false; cannot test deployment")
	}

	current := version.Current
	other := current
	other.Series = "quantal"
	if current == other {
		other.Series = "precise"
	}

	dummyCfg, err := config.New(config.NoDefaults, dummy.SampleConfig().Merge(coretesting.Attrs{
		"state-server": false,
		"name":         "dummy storage",
	}))
	dummyenv, err := environs.Prepare(dummyCfg, coretesting.Context(c), configstore.NewMem())
	c.Assert(err, gc.IsNil)
	defer dummyenv.Destroy()

	t.Destroy(c)

	attrs := t.TestConfig.Merge(coretesting.Attrs{"default-series": other.Series})
	cfg, err := config.New(config.NoDefaults, attrs)
	c.Assert(err, gc.IsNil)
	env, err := environs.Prepare(cfg, coretesting.Context(c), t.ConfigStore)
	c.Assert(err, gc.IsNil)
	defer environs.Destroy(env, t.ConfigStore)

	currentName := envtools.StorageName(current)
	otherName := envtools.StorageName(other)
	envStorage := env.Storage()
	dummyStorage := dummyenv.Storage()

	defer envStorage.Remove(otherName)

	_, err = sync.Upload(dummyStorage, &current.Number)
	c.Assert(err, gc.IsNil)

	// This will only work while cross-compiling across releases is safe,
	// which depends on external elements. Tends to be safe for the last
	// few releases, but we may have to refactor some day.
	err = storageCopy(dummyStorage, currentName, envStorage, otherName)
	c.Assert(err, gc.IsNil)

	err = bootstrap.Bootstrap(coretesting.Context(c), env, environs.BootstrapParams{})
	c.Assert(err, gc.IsNil)

	st := t.Env.(testing.GetStater).GetStateInAPIServer()
	// Wait for machine agent to come up on the bootstrap
	// machine and ensure it deployed the proper series.
	m0, err := st.Machine("0")
	c.Assert(err, gc.IsNil)
	mw0 := newMachineToolWaiter(m0)
	defer mw0.Stop()

	waitAgentTools(c, mw0, other)
}

func (t *LiveTests) TestBootstrapWithDefaultSeries(c *gc.C) {
	if !t.HasProvisioner {
		c.Skip("HasProvisioner is false; cannot test deployment")
	}

	current := version.Binary{
		Number: jujuversion.Current,
		Arch:   arch.HostArch(),
		Series: series.HostSeries(),
	}
	other := current
	other.Series = "quantal"
	if current == other {
		other.Series = "precise"
	}

	dummyCfg := dummy.SampleConfig().Merge(coretesting.Attrs{
		"controller": false,
		"name":       "dummy storage",
	})
	args := t.prepareForBootstrapParams(c)
	args.BaseConfig = dummyCfg
	dummyenv, err := environs.Prepare(envtesting.BootstrapContext(c),
		jujuclienttesting.NewMemStore(),
		args,
	)
	c.Assert(err, jc.ErrorIsNil)
	defer dummyenv.Destroy()

	t.Destroy(c)

	attrs := t.TestConfig.Merge(coretesting.Attrs{
		"name":           "livetests",
		"default-series": other.Series,
	})
	args.BaseConfig = attrs
	env, err := environs.Prepare(envtesting.BootstrapContext(c),
		t.ControllerStore,
		args)
	c.Assert(err, jc.ErrorIsNil)
	defer environs.Destroy("livetests", env, t.ControllerStore)

	err = bootstrap.Bootstrap(envtesting.BootstrapContext(c), env, bootstrap.BootstrapParams{})
	c.Assert(err, jc.ErrorIsNil)

	st := t.Env.(jujutesting.GetStater).GetStateInAPIServer()
	// Wait for machine agent to come up on the bootstrap
	// machine and ensure it deployed the proper series.
	m0, err := st.Machine("0")
	c.Assert(err, jc.ErrorIsNil)
	mw0 := newMachineToolWaiter(m0)
	defer mw0.Stop()

	waitAgentTools(c, mw0, other)
}

func (*OpenSuite) TestPrepare(c *gc.C) {
	baselineAttrs := dummy.SampleConfig().Merge(testing.Attrs{
		"state-server": false,
		"name":         "erewhemos",
	}).Delete(
		"ca-cert",
		"ca-private-key",
		"admin-secret",
		"uuid",
	)
	cfg, err := config.New(config.NoDefaults, baselineAttrs)
	c.Assert(err, gc.IsNil)
	store := configstore.NewMem()
	ctx := testing.Context(c)
	env, err := environs.Prepare(cfg, ctx, store)
	c.Assert(err, gc.IsNil)
	// Check we can access storage ok, which implies the environment has been prepared.
	c.Assert(env.Storage(), gc.NotNil)

	// Check that the environment info file was correctly created.
	info, err := store.ReadInfo("erewhemos")
	c.Assert(err, gc.IsNil)
	c.Assert(info.Initialized(), jc.IsTrue)
	c.Assert(info.BootstrapConfig(), gc.DeepEquals, env.Config().AllAttrs())
	c.Logf("bootstrap config: %#v", info.BootstrapConfig())

	// Check that an admin-secret was chosen.
	adminSecret := env.Config().AdminSecret()
	c.Assert(adminSecret, gc.HasLen, 32)
	c.Assert(adminSecret, gc.Matches, "^[0-9a-f]*$")

	// Check that the CA cert was generated.
	cfgCertPEM, cfgCertOK := env.Config().CACert()
	cfgKeyPEM, cfgKeyOK := env.Config().CAPrivateKey()
	c.Assert(cfgCertOK, gc.Equals, true)
	c.Assert(cfgKeyOK, gc.Equals, true)

	// Check the common name of the generated cert
	caCert, _, err := cert.ParseCertAndKey(cfgCertPEM, cfgKeyPEM)
	c.Assert(err, gc.IsNil)
	c.Assert(caCert.Subject.CommonName, gc.Equals, `juju-generated CA for environment "`+testing.SampleEnvName+`"`)

	// Check that a uuid was chosen.
	uuid, exists := env.Config().UUID()
	c.Assert(exists, gc.Equals, true)
	c.Assert(uuid, gc.Matches, `[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}`)

	// Check we can call Prepare again.
	env, err = environs.Prepare(cfg, ctx, store)
	c.Assert(err, gc.IsNil)
	c.Assert(env.Storage(), gc.NotNil)
	c.Assert(env.Config().AllAttrs(), gc.DeepEquals, info.BootstrapConfig())
}

func (*OpenSuite) TestPrepare(c *gc.C) {
	baselineAttrs := dummy.SampleConfig().Merge(testing.Attrs{
		"controller": false,
		"name":       "erewhemos",
	}).Delete(
		"ca-cert",
		"ca-private-key",
		"admin-secret",
	)
	cfg, err := config.New(config.NoDefaults, baselineAttrs)
	c.Assert(err, jc.ErrorIsNil)
	controllerStore := jujuclienttesting.NewMemStore()
	ctx := envtesting.BootstrapContext(c)
	env, err := environs.Prepare(ctx, controllerStore, environs.PrepareParams{
		ControllerName: cfg.Name(),
		BaseConfig:     cfg.AllAttrs(),
		CloudName:      "dummy",
	})
	c.Assert(err, jc.ErrorIsNil)

	// Check that an admin-secret was chosen.
	adminSecret := env.Config().AdminSecret()
	c.Assert(adminSecret, gc.HasLen, 32)
	c.Assert(adminSecret, gc.Matches, "^[0-9a-f]*$")

	// Check that the CA cert was generated.
	cfgCertPEM, cfgCertOK := env.Config().CACert()
	cfgKeyPEM, cfgKeyOK := env.Config().CAPrivateKey()
	c.Assert(cfgCertOK, jc.IsTrue)
	c.Assert(cfgKeyOK, jc.IsTrue)

	// Check the common name of the generated cert
	caCert, _, err := cert.ParseCertAndKey(cfgCertPEM, cfgKeyPEM)
	c.Assert(err, jc.ErrorIsNil)
	c.Assert(caCert.Subject.CommonName, gc.Equals, `juju-generated CA for model "`+testing.SampleModelName+`"`)

	// Check that controller was cached
	foundController, err := controllerStore.ControllerByName(cfg.Name())
	c.Assert(err, jc.ErrorIsNil)
	c.Assert(foundController.ControllerUUID, gc.DeepEquals, cfg.UUID())

	// Check we cannot call Prepare again.
	env, err = environs.Prepare(ctx, controllerStore, environs.PrepareParams{
		ControllerName: cfg.Name(),
		BaseConfig:     cfg.AllAttrs(),
		CloudName:      "dummy",
	})
	c.Assert(err, jc.Satisfies, errors.IsAlreadyExists)
	c.Assert(err, gc.ErrorMatches, `controller "erewhemos" already exists`)
}

func (s *Suite) SetUpTest(c *gc.C) {
	// Set up InitialConfig with a dummy provider configuration. This
	// is required to allow model import test to work.
	env, err := environs.Prepare(
		modelcmd.BootstrapContext(testing.Context(c)),
		jujuclienttesting.NewMemStore(),
		environs.PrepareParams{
			ControllerName: "dummycontroller",
			BaseConfig:     dummy.SampleConfig(),
			CloudName:      "dummy",
		},
	)
	c.Assert(err, jc.ErrorIsNil)
	s.InitialConfig = testing.CustomModelConfig(c, env.Config().AllAttrs())

	// The call up to StateSuite's SetUpTest uses s.InitialConfig so
	// it has to happen here.
	s.StateSuite.SetUpTest(c)

	s.resources = common.NewResources()
	s.AddCleanup(func(*gc.C) { s.resources.StopAll() })

	s.authorizer = apiservertesting.FakeAuthorizer{
		Tag: s.Owner,
	}
}

func (s *funcSuite) SetUpTest(c *gc.C) {
	s.baseImageMetadataSuite.SetUpTest(c)

	var err error
	s.env, err = environs.Prepare(
		envtesting.BootstrapContext(c),
		jujuclienttesting.NewMemStore(),
		environs.PrepareParams{
			ControllerName: "dummycontroller",
			BaseConfig:     mockConfig(),
			CloudName:      "dummy",
		},
	)
	c.Assert(err, jc.ErrorIsNil)
	s.state = s.constructState(s.env.Config())

	s.expected = cloudimagemetadata.Metadata{
		cloudimagemetadata.MetadataAttributes{
			Stream: "released",
			Source: "custom",
			Series: config.LatestLtsSeries(),
			Arch:   "amd64",
			Region: "dummy_region",
		},
		0,
		"",
	}
}

func (s *OpenSuite) TestUpdateEnvInfo(c *gc.C) {
	store := jujuclienttesting.NewMemStore()
	ctx := envtesting.BootstrapContext(c)
	cfg, err := config.New(config.UseDefaults, map[string]interface{}{
		"type":            "dummy",
		"name":            "admin-model",
		"controller-uuid": utils.MustNewUUID().String(),
		"uuid":            utils.MustNewUUID().String(),
	})
	c.Assert(err, jc.ErrorIsNil)
	_, err = environs.Prepare(ctx, store, environs.PrepareParams{
		ControllerName: "controller-name",
		BaseConfig:     cfg.AllAttrs(),
		CloudName:      "dummy",
	})
	c.Assert(err, jc.ErrorIsNil)

	foundController, err := store.ControllerByName("controller-name")
	c.Assert(err, jc.ErrorIsNil)
	c.Assert(foundController.ControllerUUID, gc.Equals, cfg.ControllerUUID())
	c.Assert(foundController.CACert, gc.Not(gc.Equals), "")
	foundModel, err := store.ModelByName("controller-name", "[email protected]", "admin-model")
	c.Assert(err, jc.ErrorIsNil)
	c.Assert(foundModel, jc.DeepEquals, &jujuclient.ModelDetails{
		ModelUUID: cfg.UUID(),
	})
}

func (s *OpenSuite) TestNewDummyEnviron(c *gc.C) {
	s.PatchValue(&jujuversion.Current, testing.FakeVersionNumber)
	// matches *Settings.Map()
	cfg, err := config.New(config.NoDefaults, dummySampleConfig())
	c.Assert(err, jc.ErrorIsNil)
	ctx := envtesting.BootstrapContext(c)
	cache := jujuclienttesting.NewMemStore()
	env, err := environs.Prepare(ctx, cache, environs.PrepareParams{
		ControllerName: cfg.Name(),
		BaseConfig:     cfg.AllAttrs(),
		CloudName:      "dummy",
	})
	c.Assert(err, jc.ErrorIsNil)

	storageDir := c.MkDir()
	s.PatchValue(&envtools.DefaultBaseURL, storageDir)
	stor, err := filestorage.NewFileStorageWriter(storageDir)
	c.Assert(err, jc.ErrorIsNil)
	envtesting.UploadFakeTools(c, stor, cfg.AgentStream(), cfg.AgentStream())
	err = bootstrap.Bootstrap(ctx, env, bootstrap.BootstrapParams{})
	c.Assert(err, jc.ErrorIsNil)

	// New controller should have been added to collection.
	foundController, err := cache.ControllerByName(cfg.Name())
	c.Assert(err, jc.ErrorIsNil)
	c.Assert(foundController.ControllerUUID, gc.DeepEquals, cfg.UUID())
}

func (*OpenSuite) TestDestroy(c *gc.C) {
	cfg, err := config.New(config.NoDefaults, dummy.SampleConfig().Merge(
		testing.Attrs{
			"name": "erewhemos",
		},
	))
	c.Assert(err, jc.ErrorIsNil)

	store := jujuclienttesting.NewMemStore()
	// Prepare the environment and sanity-check that
	// the config storage info has been made.
	ctx := envtesting.BootstrapContext(c)
	e, err := environs.Prepare(ctx, store, environs.PrepareParams{
		ControllerName: "controller-name",
		BaseConfig:     cfg.AllAttrs(),
		CloudName:      "dummy",
	})
	c.Assert(err, jc.ErrorIsNil)
	_, err = store.ControllerByName("controller-name")
	c.Assert(err, jc.ErrorIsNil)

	err = environs.Destroy("controller-name", e, store)
	c.Assert(err, jc.ErrorIsNil)

	// Check that the environment has actually been destroyed
	// and that the controller details been removed too.
	_, err = e.ControllerInstances()
	c.Assert(err, gc.ErrorMatches, "model is not prepared")
	_, err = store.ControllerByName("controller-name")
	c.Assert(err, jc.Satisfies, errors.IsNotFound)
}

func (s *ToolsMetadataSuite) SetUpTest(c *gc.C) {
	s.FakeJujuXDGDataHomeSuite.SetUpTest(c)
	s.AddCleanup(dummy.Reset)
	s.AddCleanup(func(*gc.C) {
		loggo.ResetLoggers()
	})
	cfg, err := config.New(config.UseDefaults, map[string]interface{}{
		"name":            "erewhemos",
		"type":            "dummy",
		"uuid":            coretesting.ModelTag.Id(),
		"controller-uuid": coretesting.ModelTag.Id(),
		"conroller":       true,
	})
	c.Assert(err, jc.ErrorIsNil)
	env, err := environs.Prepare(
		modelcmd.BootstrapContextNoVerify(coretesting.Context(c)),
		jujuclienttesting.NewMemStore(),
		environs.PrepareParams{
			ControllerName: cfg.Name(),
			BaseConfig:     cfg.AllAttrs(),
			CloudName:      "dummy",
		},
	)
	c.Assert(err, jc.ErrorIsNil)
	s.env = env
	loggo.GetLogger("").SetLogLevel(loggo.INFO)

	// Switch the default tools location.
	s.publicStorageDir = c.MkDir()
	s.PatchValue(&tools.DefaultBaseURL, s.publicStorageDir)
}

func (*NewAPIStateSuite) TestNewAPIState(c *gc.C) {
	cfg, err := config.New(config.NoDefaults, dummy.SampleConfig())
	c.Assert(err, gc.IsNil)
	ctx := coretesting.Context(c)
	env, err := environs.Prepare(cfg, ctx, configstore.NewMem())
	c.Assert(err, gc.IsNil)

	envtesting.UploadFakeTools(c, env.Storage())
	err = bootstrap.Bootstrap(ctx, env, environs.BootstrapParams{})
	c.Assert(err, gc.IsNil)

	cfg = env.Config()
	cfg, err = cfg.Apply(map[string]interface{}{
		"secret": "fnord",
	})
	c.Assert(err, gc.IsNil)
	err = env.SetConfig(cfg)
	c.Assert(err, gc.IsNil)

	st, err := juju.NewAPIState(env, api.DialOpts{})
	c.Assert(st, gc.NotNil)

	// the secrets will not be updated, as they already exist
	attrs, err := st.Client().EnvironmentGet()
	c.Assert(attrs["secret"], gc.Equals, "pork")

	c.Assert(st.Close(), gc.IsNil)
}

func (t *ProviderSuite) assertGetImageMetadataSources(c *gc.C, stream, officialSourcePath string) {
	// Make an env configured with the stream.
	envAttrs := localConfigAttrs
	if stream != "" {
		envAttrs = envAttrs.Merge(coretesting.Attrs{
			"image-stream": stream,
		})
	}
	cfg, err := config.New(config.NoDefaults, envAttrs)
	c.Assert(err, gc.IsNil)
	env, err := environs.Prepare(cfg, coretesting.Context(c), configstore.NewMem())
	c.Assert(err, gc.IsNil)
	c.Assert(env, gc.NotNil)

	sources, err := imagemetadata.GetMetadataSources(env)
	c.Assert(err, gc.IsNil)
	c.Assert(len(sources), gc.Equals, 2)
	var urls = make([]string, len(sources))
	for i, source := range sources {
		url, err := source.URL("")
		c.Assert(err, gc.IsNil)
		urls[i] = url
	}
	// The control bucket URL contains the bucket name.
	c.Check(strings.Contains(urls[0], ec2.ControlBucketName(env)+"/images"), jc.IsTrue)
	c.Assert(urls[1], gc.Equals, fmt.Sprintf("http://cloud-images.ubuntu.com/%s/", officialSourcePath))
}

func (t *localNonUSEastSuite) SetUpTest(c *gc.C) {
	t.BaseSuite.SetUpTest(c)
	t.srv.config = &s3test.Config{
		Send409Conflict: true,
	}
	t.srv.startServer(c)

	env, err := environs.Prepare(
		envtesting.BootstrapContext(c),
		jujuclienttesting.NewMemStore(),
		environs.PrepareParams{
			BaseConfig: localConfigAttrs,
			Credential: cloud.NewCredential(
				cloud.AccessKeyAuthType,
				map[string]string{
					"access-key": "x",
					"secret-key": "x",
				},
			),
			ControllerName: localConfigAttrs["name"].(string),
			CloudName:      "ec2",
			CloudRegion:    "test",
		},
	)
	c.Assert(err, jc.ErrorIsNil)
	t.env = env
}

func (cs *NewAPIStateSuite) TestNewAPIState(c *gc.C) {
	cfg, err := config.New(config.NoDefaults, dummy.SampleConfig())
	c.Assert(err, jc.ErrorIsNil)
	ctx := envtesting.BootstrapContext(c)
	env, err := environs.Prepare(cfg, ctx, configstore.NewMem())
	c.Assert(err, jc.ErrorIsNil)

	storageDir := c.MkDir()
	cs.PatchValue(&envtools.DefaultBaseURL, storageDir)
	stor, err := filestorage.NewFileStorageWriter(storageDir)
	c.Assert(err, jc.ErrorIsNil)
	envtesting.UploadFakeTools(c, stor, "released", "released")

	err = bootstrap.Bootstrap(ctx, env, bootstrap.BootstrapParams{})
	c.Assert(err, jc.ErrorIsNil)

	cfg = env.Config()
	cfg, err = cfg.Apply(map[string]interface{}{
		"secret": "fnord",
	})
	c.Assert(err, jc.ErrorIsNil)
	err = env.SetConfig(cfg)
	c.Assert(err, jc.ErrorIsNil)

	st, err := juju.NewAPIState(dummy.AdminUserTag(), env, api.DialOpts{})
	c.Assert(st, gc.NotNil)

	// the secrets will not be updated, as they already exist
	attrs, err := st.Client().EnvironmentGet()
	c.Assert(attrs["secret"], gc.Equals, "pork")

	c.Assert(st.Close(), gc.IsNil)
}

// If the environment is configured not to require a public IP address for nodes,
// bootstrapping and starting an instance should occur without any attempt to
// allocate a public address.
func (s *localServerSuite) TestStartInstanceWithoutPublicIP(c *gc.C) {
	cleanup := s.srv.Service.Nova.RegisterControlPoint(
		"addFloatingIP",
		func(sc hook.ServiceControl, args ...interface{}) error {
			return fmt.Errorf("add floating IP should not have been called")
		},
	)
	defer cleanup()
	cleanup = s.srv.Service.Nova.RegisterControlPoint(
		"addServerFloatingIP",
		func(sc hook.ServiceControl, args ...interface{}) error {
			return fmt.Errorf("add server floating IP should not have been called")
		},
	)
	defer cleanup()

	cfg, err := config.New(config.NoDefaults, s.TestConfig.Merge(coretesting.Attrs{
		"use-floating-ip": false,
	}))
	c.Assert(err, gc.IsNil)
	env, err := environs.Prepare(cfg, coretesting.Context(c), s.ConfigStore)
	c.Assert(err, gc.IsNil)
	err = bootstrap.Bootstrap(coretesting.Context(c), env, environs.BootstrapParams{})
	c.Assert(err, gc.IsNil)
	inst, _ := testing.AssertStartInstance(c, env, "100")
	err = env.StopInstances(inst.Id())
	c.Assert(err, gc.IsNil)
}

func (*OpenSuite) TestDestroy(c *gc.C) {
	cfg, err := config.New(config.NoDefaults, dummy.SampleConfig().Merge(
		testing.Attrs{
			"state-server": false,
			"name":         "erewhemos",
		},
	))
	c.Assert(err, gc.IsNil)

	store := configstore.NewMem()
	// Prepare the environment and sanity-check that
	// the config storage info has been made.
	ctx := testing.Context(c)
	e, err := environs.Prepare(cfg, ctx, store)
	c.Assert(err, gc.IsNil)
	_, err = store.ReadInfo(e.Config().Name())
	c.Assert(err, gc.IsNil)

	err = environs.Destroy(e, store)
	c.Assert(err, gc.IsNil)

	// Check that the environment has actually been destroyed
	// and that the config info has been destroyed too.
	_, err = e.StateServerInstances()
	c.Assert(err, gc.ErrorMatches, "environment has been destroyed")
	_, err = store.ReadInfo(e.Config().Name())
	c.Assert(err, jc.Satisfies, errors.IsNotFound)
}

// mockTestingEnvConfig prepares an environment configuration using
// the mock provider which does not support networking.
func mockTestingEnvConfig(c *gc.C) *config.Config {
	cfg, err := config.New(config.NoDefaults, mockConfig())
	c.Assert(err, jc.ErrorIsNil)
	env, err := environs.Prepare(cfg, modelcmd.BootstrapContext(coretesting.Context(c)), configstore.NewMem())
	c.Assert(err, jc.ErrorIsNil)
	return env.Config()
}

func (c *ImageMetadataCommandBase) prepare(context *cmd.Context, store configstore.Storage) (environs.Environ, error) {
	cfg, err := c.Config(store)
	if err != nil {
		return nil, errors.Annotate(err, "could not get config from store")
	}
	return environs.Prepare(cfg, context, store)
}