Forward containerd debug to shim invocation

Signed-off-by: Justin Terry (VM) <juterry@microsoft.com>

runtime/v2/shim/shim.go

@@ -53,6 +53,14 @@ type Shim interface {
 	StartShim(ctx context.Context, id, containerdBinary, containerdAddress string) (string, error)
 }
 
+// OptsKey is the context key for the Opts value.
+type OptsKey struct{}
+
+// Opts are context options associated with the shim invocation.
+type Opts struct {
+	Debug bool
+}
+
 var (
 	debugFlag            bool
 	idFlag               string
@@ -133,6 +141,7 @@ func run(id string, initFunc Init) error {
 		return fmt.Errorf("shim namespace cannot be empty")
 	}
 	ctx := namespaces.WithNamespace(context.Background(), namespaceFlag)
+	ctx = context.WithValue(ctx, OptsKey{}, Opts{Debug: debugFlag})
 	ctx = log.WithLogger(ctx, log.G(ctx).WithField("runtime", id))
 
 	service, err := initFunc(ctx, idFlag, publisher)

runtime/v2/shim/shim_test.go

@@ -0,0 +1,39 @@
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package shim
+
+import (
+	"context"
+	"testing"
+)
+
+func TestShimOptWithValue(t *testing.T) {
+	ctx := context.TODO()
+	ctx = context.WithValue(ctx, OptsKey{}, Opts{Debug: true})
+
+	o := ctx.Value(OptsKey{})
+	if o == nil {
+		t.Fatal("opts nil")
+	}
+	op, ok := o.(Opts)
+	if !ok {
+		t.Fatal("opts not of type Opts")
+	}
+	if !op.Debug {
+		t.Fatal("opts.Debug should be true")
+	}
+}