| package llbsolver |
| |
| import ( |
| "strings" |
| |
| "github.com/moby/buildkit/solver" |
| "github.com/moby/buildkit/solver/pb" |
| "github.com/moby/buildkit/source" |
| digest "github.com/opencontainers/go-digest" |
| "github.com/pkg/errors" |
| ) |
| |
| type vertex struct { |
| sys interface{} |
| options solver.VertexOptions |
| inputs []solver.Edge |
| digest digest.Digest |
| name string |
| } |
| |
| func (v *vertex) Digest() digest.Digest { |
| return v.digest |
| } |
| |
| func (v *vertex) Sys() interface{} { |
| return v.sys |
| } |
| |
| func (v *vertex) Options() solver.VertexOptions { |
| return v.options |
| } |
| |
| func (v *vertex) Inputs() []solver.Edge { |
| return v.inputs |
| } |
| |
| func (v *vertex) Name() string { |
| return v.name |
| } |
| |
| type LoadOpt func(*solver.VertexOptions) |
| |
| func WithCacheSources(cms []solver.CacheManager) LoadOpt { |
| return func(opt *solver.VertexOptions) { |
| opt.CacheSources = cms |
| } |
| } |
| |
| func Load(def *pb.Definition, opts ...LoadOpt) (solver.Edge, error) { |
| return loadLLB(def, func(dgst digest.Digest, pbOp *pb.Op, load func(digest.Digest) (solver.Vertex, error)) (solver.Vertex, error) { |
| opMetadata := def.Metadata[dgst] |
| vtx, err := newVertex(dgst, pbOp, &opMetadata, load, opts...) |
| if err != nil { |
| return nil, err |
| } |
| return vtx, nil |
| }) |
| } |
| |
| func newVertex(dgst digest.Digest, op *pb.Op, opMeta *pb.OpMetadata, load func(digest.Digest) (solver.Vertex, error), opts ...LoadOpt) (*vertex, error) { |
| opt := solver.VertexOptions{} |
| if opMeta != nil { |
| opt.IgnoreCache = opMeta.IgnoreCache |
| opt.Description = opMeta.Description |
| if opMeta.ExportCache != nil { |
| opt.ExportCache = &opMeta.ExportCache.Value |
| } |
| } |
| for _, fn := range opts { |
| fn(&opt) |
| } |
| vtx := &vertex{sys: op.Op, options: opt, digest: dgst, name: llbOpName(op)} |
| for _, in := range op.Inputs { |
| sub, err := load(in.Digest) |
| if err != nil { |
| return nil, err |
| } |
| vtx.inputs = append(vtx.inputs, solver.Edge{Index: solver.Index(in.Index), Vertex: sub}) |
| } |
| return vtx, nil |
| } |
| |
| // loadLLB loads LLB. |
| // fn is executed sequentially. |
| func loadLLB(def *pb.Definition, fn func(digest.Digest, *pb.Op, func(digest.Digest) (solver.Vertex, error)) (solver.Vertex, error)) (solver.Edge, error) { |
| if len(def.Def) == 0 { |
| return solver.Edge{}, errors.New("invalid empty definition") |
| } |
| |
| allOps := make(map[digest.Digest]*pb.Op) |
| |
| var dgst digest.Digest |
| |
| for _, dt := range def.Def { |
| var op pb.Op |
| if err := (&op).Unmarshal(dt); err != nil { |
| return solver.Edge{}, errors.Wrap(err, "failed to parse llb proto op") |
| } |
| dgst = digest.FromBytes(dt) |
| allOps[dgst] = &op |
| } |
| |
| lastOp := allOps[dgst] |
| delete(allOps, dgst) |
| dgst = lastOp.Inputs[0].Digest |
| |
| cache := make(map[digest.Digest]solver.Vertex) |
| |
| var rec func(dgst digest.Digest) (solver.Vertex, error) |
| rec = func(dgst digest.Digest) (solver.Vertex, error) { |
| if v, ok := cache[dgst]; ok { |
| return v, nil |
| } |
| v, err := fn(dgst, allOps[dgst], rec) |
| if err != nil { |
| return nil, err |
| } |
| cache[dgst] = v |
| return v, nil |
| } |
| |
| v, err := rec(dgst) |
| if err != nil { |
| return solver.Edge{}, err |
| } |
| return solver.Edge{Vertex: v, Index: solver.Index(lastOp.Inputs[0].Index)}, nil |
| } |
| |
| func llbOpName(op *pb.Op) string { |
| switch op := op.Op.(type) { |
| case *pb.Op_Source: |
| if id, err := source.FromLLB(op); err == nil { |
| if id, ok := id.(*source.LocalIdentifier); ok { |
| if len(id.IncludePatterns) == 1 { |
| return op.Source.Identifier + " (" + id.IncludePatterns[0] + ")" |
| } |
| } |
| } |
| return op.Source.Identifier |
| case *pb.Op_Exec: |
| return strings.Join(op.Exec.Meta.Args, " ") |
| case *pb.Op_Build: |
| return "build" |
| default: |
| return "unknown" |
| } |
| } |