implemented services unix and npipe complete with test

Signed-off-by: Richard Jones <richard@dagger.io>

plan/task/service.go

@@ -0,0 +1,45 @@
+package task
+
+import (
+	"context"
+	"errors"
+
+	"cuelang.org/go/cue"
+	"github.com/rs/zerolog/log"
+	"go.dagger.io/dagger/compiler"
+	"go.dagger.io/dagger/plancontext"
+	"go.dagger.io/dagger/solver"
+)
+
+func init() {
+	Register("Service", func() Task { return &serviceTask{} })
+}
+
+type serviceTask struct {
+}
+
+func (c serviceTask) Run(ctx context.Context, pctx *plancontext.Context, s solver.Solver, v *compiler.Value) (*compiler.Value, error) {
+	unix, _ := v.LookupPath(cue.ParsePath("unix")).String()
+	npipe, _ := v.LookupPath(cue.ParsePath("npipe")).String()
+
+	if unix == "" && npipe == "" {
+		return nil, errors.New("invalid service")
+	}
+
+	lg := log.Ctx(ctx).Debug()
+
+	if unix != "" {
+		lg.Str("unix", unix)
+	} else if npipe != "" {
+		lg.Str("npipe", npipe)
+	}
+
+	lg.Msg("loading service")
+
+	service := pctx.Services.New(unix, npipe)
+	out := compiler.NewValue()
+	if err := out.FillPath(cue.ParsePath("service"), service.MarshalCUE()); err != nil {
+		return nil, err
+	}
+	return out, nil
+}