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asset.go
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asset.go
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package asset
import (
"io/ioutil"
"os"
"path/filepath"
"github.com/pkg/errors"
)
// Asset used to install OpenShift.
type Asset interface {
// Dependencies returns the assets upon which this asset directly depends.
Dependencies() []Asset
// Generate generates this asset given the states of its parent assets.
Generate(Parents) error
// Name returns the human-friendly name of the asset.
Name() string
}
// WritableAsset is an Asset that has files that can be written to disk.
// It can also be loaded from disk.
type WritableAsset interface {
Asset
// Files returns the files to write.
Files() []*File
// Load returns the on-disk asset if it exists.
// The asset object should be changed only when it's loaded successfully.
Load(FileFetcher) (found bool, err error)
}
// File is a file for an Asset.
type File struct {
// Filename is the name of the file.
Filename string
// Data is the contents of the file.
Data []byte
}
// PersistToFile writes all of the files of the specified asset into the specified
// directory.
func PersistToFile(asset WritableAsset, directory string) error {
for _, f := range asset.Files() {
path := filepath.Join(directory, f.Filename)
if err := os.MkdirAll(filepath.Dir(path), 0755); err != nil {
return errors.Wrap(err, "failed to create dir")
}
if err := ioutil.WriteFile(path, f.Data, 0644); err != nil {
return errors.Wrap(err, "failed to write file")
}
}
return nil
}