123 lines
2.4 KiB
Go
123 lines
2.4 KiB
Go
package solver
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import (
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"encoding/json"
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"os"
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"github.com/containerd/containerd/fs"
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"github.com/moby/buildkit/client/llb"
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"github.com/moby/buildkit/snapshot"
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"github.com/moby/buildkit/solver/pb"
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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/net/context"
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)
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const buildCacheType = "buildkit.build.v0"
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type buildOp struct {
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op *pb.BuildOp
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s *Solver
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v Vertex
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}
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func newBuildOp(v Vertex, op *pb.Op_Build, s *Solver) (Op, error) {
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return &buildOp{
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op: op.Build,
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s: s,
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v: v,
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}, nil
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}
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func (b *buildOp) CacheKey(ctx context.Context) (digest.Digest, error) {
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dt, err := json.Marshal(struct {
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Type string
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Exec *pb.BuildOp
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}{
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Type: buildCacheType,
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Exec: b.op,
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})
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if err != nil {
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return "", err
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}
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return digest.FromBytes(dt), nil
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}
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func (b *buildOp) Run(ctx context.Context, inputs []Reference) (outputs []Reference, retErr error) {
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if b.op.Builder != pb.LLBBuilder {
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return nil, errors.Errorf("only llb builder is currently allowed")
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}
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builderInputs := b.op.Inputs
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llbDef, ok := builderInputs[pb.LLBDefinitionInput]
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if !ok {
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return nil, errors.Errorf("no llb definition input %s found", pb.LLBDefinitionInput)
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}
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i := int(llbDef.Input)
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if i >= len(inputs) {
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return nil, errors.Errorf("invalid index %v", i) // TODO: this should be validated before
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}
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inp := inputs[i]
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ref, ok := toImmutableRef(inp)
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if !ok {
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return nil, errors.Errorf("invalid reference for build %T", inp)
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}
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mount, err := ref.Mount(ctx, false)
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if err != nil {
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return nil, err
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}
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lm := snapshot.LocalMounter(mount)
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root, err := lm.Mount()
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if err != nil {
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return nil, err
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}
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defer func() {
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if retErr != nil && lm != nil {
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lm.Unmount()
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}
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}()
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fn := pb.LLBDefaultDefinitionFile
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if override, ok := b.op.Attrs[pb.AttrLLBDefinitionFilename]; ok {
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fn = override
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}
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newfn, err := fs.RootPath(root, fn)
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if err != nil {
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return nil, errors.Wrapf(err, "working dir %s points to invalid target", fn)
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}
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f, err := os.Open(newfn)
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if err != nil {
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return nil, errors.Wrapf(err, "failed to open %s", newfn)
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}
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def, err := llb.ReadFrom(f)
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if err != nil {
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f.Close()
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return nil, err
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}
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f.Close()
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lm.Unmount()
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lm = nil
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newref, err := b.s.subBuild(ctx, b.v.Digest(), SolveRequest{
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Definition: def.ToPB(),
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})
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if err != nil {
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return nil, err
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}
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return []Reference{newref}, err
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}
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func (b *buildOp) ContentMask(context.Context) (digest.Digest, [][]string, error) {
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return "", nil, nil
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}
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