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previewcmd.go
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previewcmd.go
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// Copyright 2019 Google LLC
//
// 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 commands
import (
"github.com/GoogleContainerTools/kpt/internal/util/setters"
"github.com/GoogleContainerTools/kpt/pkg/live/preprocess"
"github.com/spf13/cobra"
"k8s.io/cli-runtime/pkg/genericclioptions"
"sigs.k8s.io/cli-utils/cmd/flagutils"
"sigs.k8s.io/cli-utils/cmd/preview"
"sigs.k8s.io/cli-utils/pkg/common"
"sigs.k8s.io/cli-utils/pkg/inventory"
"sigs.k8s.io/cli-utils/pkg/manifestreader"
"sigs.k8s.io/cli-utils/pkg/provider"
)
// Get PreviewRunner returns a wrapper around the cli-utils preview command PreviewRunner. Sets
// up the Run on this wrapped runner to be the PreviewRunnerWrapper run.
func GetPreviewRunner(provider provider.Provider, loader manifestreader.ManifestLoader, ioStreams genericclioptions.IOStreams) *PreviewRunnerWrapper {
previewRunner := preview.GetPreviewRunner(provider, loader, ioStreams)
w := &PreviewRunnerWrapper{
previewRunner: previewRunner,
provider: provider,
}
// Set the wrapper run to be the RunE function for the wrapped command.
previewRunner.Command.RunE = w.RunE
previewRunner.Command.PreRunE = w.PreRunE
return w
}
// PreviewRunnerWrapper encapsulates the cli-utils preview command PreviewRunner as well
// as structures necessary to run.
type PreviewRunnerWrapper struct {
previewRunner *preview.PreviewRunner
provider provider.Provider
}
// Command returns the wrapped PreviewRunner cobraCommand structure.
func (w *PreviewRunnerWrapper) Command() *cobra.Command {
return w.previewRunner.Command
}
func (w *PreviewRunnerWrapper) PreRunE(_ *cobra.Command, args []string) error {
if len(args) > 0 {
if err := setters.CheckForRequiredSetters(args[0]); err != nil {
return err
}
}
return nil
}
// RunE checks if required setters are set as a pre-step if Kptfile
// exists in the package path. Then the wrapped PreviewRunner is
// invoked. Returns an error if one happened.
func (w *PreviewRunnerWrapper) RunE(cmd *cobra.Command, args []string) error {
if w.Command().Flag(flagutils.InventoryPolicyFlag).Value.String() == flagutils.InventoryPolicyStrict {
w.previewRunner.PreProcess = func(inv inventory.InventoryInfo, strategy common.DryRunStrategy) (inventory.InventoryPolicy, error) {
return preprocess.PreProcess(w.provider, inv, strategy)
}
}
return w.previewRunner.RunE(cmd, args)
}