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layers.go
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layers.go
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package lifecycle
import (
"fmt"
"io/ioutil"
"os"
"path/filepath"
"sort"
"strings"
"github.com/BurntSushi/toml"
"github.com/pkg/errors"
"github.com/buildpacks/lifecycle/launch"
)
type bpLayersDir struct {
path string
layers []bpLayer
name string
buildpack Buildpack
store *BuildpackStore
}
func readBuildpackLayersDir(layersDir string, buildpack Buildpack) (bpLayersDir, error) {
path := filepath.Join(layersDir, launch.EscapeID(buildpack.ID))
bpDir := bpLayersDir{
name: buildpack.ID,
path: path,
layers: []bpLayer{},
buildpack: buildpack,
}
fis, err := ioutil.ReadDir(path)
if err != nil && !os.IsNotExist(err) {
return bpLayersDir{}, err
}
names := map[string]struct{}{}
for _, fi := range fis {
if fi.IsDir() {
bpDir.layers = append(bpDir.layers, *bpDir.newBPLayer(fi.Name()))
names[fi.Name()] = struct{}{}
}
}
tomls, err := filepath.Glob(filepath.Join(path, "*.toml"))
if err != nil {
return bpLayersDir{}, err
}
for _, tf := range tomls {
name := strings.TrimSuffix(filepath.Base(tf), ".toml")
if name == "store" {
var bpStore BuildpackStore
_, err := toml.DecodeFile(tf, &bpStore)
if err != nil {
return bpLayersDir{}, errors.Wrapf(err, "failed decoding store.toml for buildpack %q", buildpack.ID)
}
bpDir.store = &bpStore
continue
}
if _, ok := names[name]; !ok {
bpDir.layers = append(bpDir.layers, *bpDir.newBPLayer(name))
}
}
sort.Slice(bpDir.layers, func(i, j int) bool {
return bpDir.layers[i].identifier < bpDir.layers[j].identifier
})
return bpDir, nil
}
func forLaunch(l bpLayer) bool {
md, err := l.read()
return err == nil && md.Launch
}
func forMalformed(l bpLayer) bool {
_, err := l.read()
return err != nil
}
func forCached(l bpLayer) bool {
md, err := l.read()
return err == nil && md.Cache
}
func (bd *bpLayersDir) findLayers(f func(layer bpLayer) bool) []bpLayer {
var selectedLayers []bpLayer
for _, l := range bd.layers {
if f(l) {
selectedLayers = append(selectedLayers, l)
}
}
return selectedLayers
}
func (bd *bpLayersDir) newBPLayer(name string) *bpLayer {
return &bpLayer{
layer{
path: filepath.Join(bd.path, name),
identifier: fmt.Sprintf("%s:%s", bd.buildpack.ID, name),
},
}
}
type bpLayer struct {
layer
}
func (bp *bpLayer) read() (BuildpackLayerMetadata, error) {
var data BuildpackLayerMetadata
tomlPath := bp.path + ".toml"
fh, err := os.Open(tomlPath)
if os.IsNotExist(err) {
return BuildpackLayerMetadata{}, nil
} else if err != nil {
return BuildpackLayerMetadata{}, err
}
defer fh.Close()
if _, err := toml.DecodeFile(tomlPath, &data); err != nil {
return BuildpackLayerMetadata{}, err
}
sha, err := ioutil.ReadFile(bp.path + ".sha")
if err != nil {
if os.IsNotExist(err) {
return data, nil
}
return BuildpackLayerMetadata{}, err
}
data.SHA = string(sha)
return data, nil
}
func (bp *bpLayer) remove() error {
if err := os.RemoveAll(bp.path); err != nil && !os.IsNotExist(err) {
return err
}
if err := os.Remove(bp.path + ".sha"); err != nil && !os.IsNotExist(err) {
return err
}
if err := os.Remove(bp.path + ".toml"); err != nil && !os.IsNotExist(err) {
return err
}
return nil
}
func (bp *bpLayer) writeMetadata(metadata BuildpackLayerMetadata) error {
path := filepath.Join(bp.path + ".toml")
if err := os.MkdirAll(filepath.Dir(path), 0777); err != nil {
return err
}
fh, err := os.Create(path)
if err != nil {
return err
}
defer fh.Close()
return toml.NewEncoder(fh).Encode(metadata.BuildpackLayerMetadataFile)
}
func (bp *bpLayer) hasLocalContents() bool {
_, err := ioutil.ReadDir(bp.path)
return !os.IsNotExist(err)
}
func (bp *bpLayer) writeSha(sha string) error {
if err := ioutil.WriteFile(bp.path+".sha", []byte(sha), 0777); err != nil {
return err
}
return nil
}
func (bp *bpLayer) name() string {
return filepath.Base(bp.path)
}
type layer struct {
path string
identifier string
}
func (l *layer) Identifier() string {
return l.identifier
}
func (l *layer) Path() string {
return l.path
}
type identifiableLayer interface {
Identifier() string
Path() string
}