feat(helm): add rollback cmd

cmd/helm/helm.go

@@ -93,6 +93,7 @@ func newRootCmd(out io.Writer) *cobra.Command {
 		newListCmd(nil, out),
 		newStatusCmd(nil, out),
 		newUpgradeCmd(nil, out),
+		newRollbackCmd(nil, out),
 	)
 	return cmd
 }

cmd/helm/rollback.go

@@ -0,0 +1,76 @@
+/*
+Copyright 2016 The Kubernetes Authors All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package main
+
+import (
+	"fmt"
+	"io"
+
+	"github.com/spf13/cobra"
+
+	"k8s.io/helm/pkg/helm"
+)
+
+const rollbackDesc = `
+This command rolls back a release to the previous version.
+
+The rollback argument is the name of a release.
+
+`
+
+type rollbackCmd struct {
+	name         string
+	dryRun       bool
+	disableHooks bool
+	out          io.Writer
+	client       helm.Interface
+}
+
+func newRollbackCmd(c helm.Interface, out io.Writer) *cobra.Command {
+	rollback := &rollbackCmd{
+		out:    out,
+		client: c,
+	}
+
+	cmd := &cobra.Command{
+		Use:               "rollback [RELEASE]",
+		Short:             "roll back a release to the previous version",
+		Long:              rollbackDesc,
+		PersistentPreRunE: setupConnection,
+		RunE: func(cmd *cobra.Command, args []string) error {
+			if err := checkArgsLength(1, len(args), "release name"); err != nil {
+				return err
+			}
+			rollback.client = ensureHelmClient(rollback.client)
+			return rollback.run()
+		},
+	}
+
+	f := cmd.Flags()
+	f.BoolVar(&rollback.dryRun, "dry-run", false, "simulate an install")
+	f.BoolVar(&rollback.disableHooks, "no-hooks", false, "prevent hooks from running during rollback")
+	return cmd
+}
+
+func (r *rollbackCmd) run() error {
+
+	msg := "This command is under construction. Coming soon to a Helm near you!"
+
+	fmt.Fprintf(r.out, msg)
+
+	return nil
+}

cmd/helm/rollback_test.go

@@ -0,0 +1,43 @@
+/*
+Copyright 2016 The Kubernetes Authors All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package main
+
+import (
+	"io"
+	"testing"
+
+	"github.com/spf13/cobra"
+)
+
+func TestRollbackCmd(t *testing.T) {
+
+	tests := []releaseCase{
+		{
+			name:     "rollback a release",
+			args:     []string{"funny-honey"},
+			resp:     nil,
+			expected: "This command is under construction. Coming soon to a Helm near you!",
+		},
+	}
+
+	cmd := func(c *fakeReleaseClient, out io.Writer) *cobra.Command {
+		return newRollbackCmd(c, out)
+	}
+
+	runReleaseCases(t, tests, cmd)
+
+}