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files.go
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files.go
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// Data Format Files for the buildpack api spec (https://github.com/buildpacks/spec/blob/main/buildpack.md#data-format).
package buildpack
import (
"errors"
"fmt"
"os"
"github.com/buildpacks/lifecycle/buildpack/layertypes"
api05 "github.com/buildpacks/lifecycle/buildpack/v05"
api06 "github.com/buildpacks/lifecycle/buildpack/v06"
"github.com/buildpacks/lifecycle/launch"
"github.com/buildpacks/lifecycle/layers"
)
// launch.toml
type LaunchTOML struct {
BOM []BOMEntry
Labels []Label
Processes []launch.Process `toml:"processes"`
Slices []layers.Slice `toml:"slices"`
}
type BOMEntry struct {
Require
Buildpack GroupBuildpack `toml:"buildpack" json:"buildpack"`
}
type Require struct {
Name string `toml:"name" json:"name"`
Version string `toml:"version,omitempty" json:"version,omitempty"`
Metadata map[string]interface{} `toml:"metadata" json:"metadata"`
}
func (r *Require) convertMetadataToVersion() {
if version, ok := r.Metadata["version"]; ok {
r.Version = fmt.Sprintf("%v", version)
}
}
func (r *Require) ConvertVersionToMetadata() {
if r.Version != "" {
if r.Metadata == nil {
r.Metadata = make(map[string]interface{})
}
r.Metadata["version"] = r.Version
r.Version = ""
}
}
func (r *Require) hasDoublySpecifiedVersions() bool {
if _, ok := r.Metadata["version"]; ok {
return r.Version != ""
}
return false
}
func (r *Require) hasInconsistentVersions() bool {
if version, ok := r.Metadata["version"]; ok {
return r.Version != "" && r.Version != version
}
return false
}
func (r *Require) hasTopLevelVersions() bool {
return r.Version != ""
}
type Label struct {
Key string `toml:"key"`
Value string `toml:"value"`
}
// build.toml
type BuildTOML struct {
BOM []BOMEntry `toml:"bom"`
Unmet []Unmet `toml:"unmet"`
}
type Unmet struct {
Name string `toml:"name"`
}
// store.toml
type StoreTOML struct {
Data map[string]interface{} `json:"metadata" toml:"metadata"`
}
// build plan
type BuildPlan struct {
PlanSections
Or planSectionsList `toml:"or"`
}
func (p *PlanSections) hasInconsistentVersions() bool {
for _, req := range p.Requires {
if req.hasInconsistentVersions() {
return true
}
}
return false
}
func (p *PlanSections) hasDoublySpecifiedVersions() bool {
for _, req := range p.Requires {
if req.hasDoublySpecifiedVersions() {
return true
}
}
return false
}
func (p *PlanSections) hasTopLevelVersions() bool {
for _, req := range p.Requires {
if req.hasTopLevelVersions() {
return true
}
}
return false
}
type planSectionsList []PlanSections
func (p *planSectionsList) hasInconsistentVersions() bool {
for _, planSection := range *p {
if planSection.hasInconsistentVersions() {
return true
}
}
return false
}
func (p *planSectionsList) hasDoublySpecifiedVersions() bool {
for _, planSection := range *p {
if planSection.hasDoublySpecifiedVersions() {
return true
}
}
return false
}
func (p *planSectionsList) hasTopLevelVersions() bool {
for _, planSection := range *p {
if planSection.hasTopLevelVersions() {
return true
}
}
return false
}
type PlanSections struct {
Requires []Require `toml:"requires"`
Provides []Provide `toml:"provides"`
}
type Provide struct {
Name string `toml:"name"`
}
// buildpack plan
type Plan struct {
Entries []Require `toml:"entries"`
}
func (p Plan) filter(unmet []Unmet) Plan {
var out []Require
for _, entry := range p.Entries {
if !containsName(unmet, entry.Name) {
out = append(out, entry)
}
}
return Plan{Entries: out}
}
func (p Plan) toBOM() []BOMEntry {
var bom []BOMEntry
for _, entry := range p.Entries {
bom = append(bom, BOMEntry{Require: entry})
}
return bom
}
func containsName(unmet []Unmet, name string) bool {
for _, u := range unmet {
if u.Name == name {
return true
}
}
return false
}
// layer content metadata
type EncoderDecoder interface {
IsSupported(buildpackAPI string) bool
Encode(file *os.File, lmf layertypes.LayerMetadataFile) error
Decode(path string) (layertypes.LayerMetadataFile, string, error)
}
func defaultEncodersDecoders() []EncoderDecoder {
return []EncoderDecoder{
// TODO: it's weird that api05 is relevant for buildpack APIs 0.2-0.5 and api06 is relevant for buildpack API 0.6 and up. We should work on it.
api05.NewEncoderDecoder(),
api06.NewEncoderDecoder(),
}
}
func EncodeLayerMetadataFile(lmf layertypes.LayerMetadataFile, path, buildpackAPI string) error {
fh, err := os.Create(path)
if err != nil {
return err
}
defer fh.Close()
encoders := defaultEncodersDecoders()
for _, encoder := range encoders {
if encoder.IsSupported(buildpackAPI) {
return encoder.Encode(fh, lmf)
}
}
return errors.New("couldn't find an encoder")
}
func DecodeLayerMetadataFile(path, buildpackAPI string) (layertypes.LayerMetadataFile, string, error) { // TODO: pass the logger and print the warning inside (instead of returning a message)
fh, err := os.Open(path)
if os.IsNotExist(err) {
return layertypes.LayerMetadataFile{}, "", nil
} else if err != nil {
return layertypes.LayerMetadataFile{}, "", err
}
defer fh.Close()
decoders := defaultEncodersDecoders()
for _, decoder := range decoders {
if decoder.IsSupported(buildpackAPI) {
return decoder.Decode(path)
}
}
return layertypes.LayerMetadataFile{}, "", errors.New("couldn't find a decoder")
}