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|
package cacheimport
import (
"encoding/json"
"github.com/moby/buildkit/solver"
"github.com/moby/buildkit/util/contentutil"
ocispecs "github.com/opencontainers/image-spec/specs-go/v1"
"github.com/pkg/errors"
)
func Parse(configJSON []byte, provider DescriptorProvider, t solver.CacheExporterTarget) error {
var config CacheConfig
if err := json.Unmarshal(configJSON, &config); err != nil {
return errors.WithStack(err)
}
return ParseConfig(config, provider, t)
}
func ParseConfig(config CacheConfig, provider DescriptorProvider, t solver.CacheExporterTarget) error {
cache := map[int]solver.CacheExporterRecord{}
for i := range config.Records {
if _, err := parseRecord(config, i, provider, t, cache); err != nil {
return err
}
}
return nil
}
func parseRecord(cc CacheConfig, idx int, provider DescriptorProvider, t solver.CacheExporterTarget, cache map[int]solver.CacheExporterRecord) (solver.CacheExporterRecord, error) {
if r, ok := cache[idx]; ok {
if r == nil {
return nil, errors.Errorf("invalid looping record")
}
return r, nil
}
if idx < 0 || idx >= len(cc.Records) {
return nil, errors.Errorf("invalid record ID: %d", idx)
}
rec := cc.Records[idx]
r := t.Add(rec.Digest)
cache[idx] = nil
for i, inputs := range rec.Inputs {
for _, inp := range inputs {
src, err := parseRecord(cc, inp.LinkIndex, provider, t, cache)
if err != nil {
return nil, err
}
r.LinkFrom(src, i, inp.Selector)
}
}
for _, res := range rec.Results {
visited := map[int]struct{}{}
remote, err := getRemoteChain(cc.Layers, res.LayerIndex, provider, visited)
if err != nil {
return nil, err
}
if remote != nil {
r.AddResult("", 0, res.CreatedAt, remote)
}
}
for _, res := range rec.ChainedResults {
remote := &solver.Remote{}
mp := contentutil.NewMultiProvider(nil)
for _, diff := range res.LayerIndexes {
if diff < 0 || diff >= len(cc.Layers) {
return nil, errors.Errorf("invalid layer index %d", diff)
}
l := cc.Layers[diff]
descPair, ok := provider[l.Blob]
if !ok {
remote = nil
break
}
remote.Descriptors = append(remote.Descriptors, descPair.Descriptor)
mp.Add(descPair.Descriptor.Digest, descPair)
}
if remote != nil {
remote.Provider = mp
r.AddResult("", 0, res.CreatedAt, remote)
}
}
cache[idx] = r
return r, nil
}
func getRemoteChain(layers []CacheLayer, idx int, provider DescriptorProvider, visited map[int]struct{}) (*solver.Remote, error) {
if _, ok := visited[idx]; ok {
return nil, errors.Errorf("invalid looping layer")
}
visited[idx] = struct{}{}
if idx < 0 || idx >= len(layers) {
return nil, errors.Errorf("invalid layer index %d", idx)
}
l := layers[idx]
descPair, ok := provider[l.Blob]
if !ok {
return nil, nil
}
var r *solver.Remote
if l.ParentIndex != -1 {
var err error
r, err = getRemoteChain(layers, l.ParentIndex, provider, visited)
if err != nil {
return nil, err
}
if r == nil {
return nil, nil
}
r.Descriptors = append(r.Descriptors, descPair.Descriptor)
mp := contentutil.NewMultiProvider(r.Provider)
mp.Add(descPair.Descriptor.Digest, descPair)
r.Provider = mp
return r, nil
}
return &solver.Remote{
Descriptors: []ocispecs.Descriptor{descPair.Descriptor},
Provider: descPair,
}, nil
}
|
