75 lines
1.8 KiB
Go
75 lines
1.8 KiB
Go
package llbsolver
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import (
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"bytes"
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"context"
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"path"
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"github.com/moby/buildkit/cache/contenthash"
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"github.com/moby/buildkit/solver"
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"github.com/moby/buildkit/worker"
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digest "github.com/opencontainers/go-digest"
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"github.com/pkg/errors"
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"golang.org/x/sync/errgroup"
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)
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type Selector struct {
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Path string
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Wildcard bool
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FollowLinks bool
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}
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func NewContentHashFunc(selectors []Selector) solver.ResultBasedCacheFunc {
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return func(ctx context.Context, res solver.Result) (digest.Digest, error) {
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ref, ok := res.Sys().(*worker.WorkerRef)
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if !ok {
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return "", errors.Errorf("invalid reference: %T", res)
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}
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if len(selectors) == 0 {
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selectors = []Selector{{}}
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}
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dgsts := make([][]byte, len(selectors))
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eg, ctx := errgroup.WithContext(ctx)
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for i, sel := range selectors {
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// FIXME(tonistiigi): enabling this parallelization seems to create wrong results for some big inputs(like gobuild)
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// func(i int) {
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// eg.Go(func() error {
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if !sel.Wildcard {
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dgst, err := contenthash.Checksum(ctx, ref.ImmutableRef, path.Join("/", sel.Path), sel.FollowLinks)
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if err != nil {
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return "", err
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}
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dgsts[i] = []byte(dgst)
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} else {
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dgst, err := contenthash.ChecksumWildcard(ctx, ref.ImmutableRef, path.Join("/", sel.Path), sel.FollowLinks)
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if err != nil {
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return "", err
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}
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dgsts[i] = []byte(dgst)
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}
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// return nil
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// })
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// }(i)
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}
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if err := eg.Wait(); err != nil {
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return "", err
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}
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return digest.FromBytes(bytes.Join(dgsts, []byte{0})), nil
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}
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}
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func workerRefConverter(ctx context.Context, res solver.Result) (*solver.Remote, error) {
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ref, ok := res.Sys().(*worker.WorkerRef)
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if !ok {
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return nil, errors.Errorf("invalid result: %T", res.Sys())
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}
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return ref.Worker.GetRemote(ctx, ref.ImmutableRef, true)
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}
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