Add runc.Features(ctx) to wrap runc features

go.mod

@@ -4,7 +4,7 @@ go 1.18
 
 require (
 	github.com/containerd/console v1.0.3
-	github.com/opencontainers/runtime-spec v1.0.3-0.20210326190908-1c3f411f0417
+	github.com/opencontainers/runtime-spec v1.1.0-rc.2
 	github.com/sirupsen/logrus v1.9.0
 	golang.org/x/sys v0.2.0
 )

go.sum

@@ -3,8 +3,8 @@ github.com/containerd/console v1.0.3/go.mod h1:7LqA/THxQ86k76b8c/EMSiaJ3h1eZkMkX
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/opencontainers/runtime-spec v1.0.3-0.20210326190908-1c3f411f0417 h1:3snG66yBm59tKhhSPQrQ/0bCrv1LQbKt40LnUPiUxdc=
-github.com/opencontainers/runtime-spec v1.0.3-0.20210326190908-1c3f411f0417/go.mod h1:jwyrGlmzljRJv/Fgzds9SsS/C5hL+LL3ko9hs6T5lQ0=
+github.com/opencontainers/runtime-spec v1.1.0-rc.2 h1:ucBtEms2tamYYW/SvGpvq9yUN0NEVL6oyLEwDcTSrk8=
+github.com/opencontainers/runtime-spec v1.1.0-rc.2/go.mod h1:jwyrGlmzljRJv/Fgzds9SsS/C5hL+LL3ko9hs6T5lQ0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/sirupsen/logrus v1.9.0 h1:trlNQbNUG3OdDrDil03MCb1H2o9nJ1x4/5LYw7byDE0=

runc.go

@@ -32,6 +32,7 @@ import (
 	"time"
 
 	specs "github.com/opencontainers/runtime-spec/specs-go"
+	"github.com/opencontainers/runtime-spec/specs-go/features"
 )
 
 // Format is the type of log formatting options available
@@ -744,6 +745,26 @@ func parseVersion(data []byte) (Version, error) {
 	return v, nil
 }
 
+// Features shows the features implemented by the runtime.
+//
+// Availability:
+//
+//   - runc:  supported since runc v1.1.0
+//   - crun:  https://github.com/containers/crun/issues/1177
+//   - youki: https://github.com/containers/youki/issues/815
+func (r *Runc) Features(context context.Context) (*features.Features, error) {
+	data, err := r.cmdOutput(r.command(context, "features"), false, nil)
+	defer putBuf(data)
+	if err != nil {
+		return nil, err
+	}
+	var feat features.Features
+	if err := json.Unmarshal(data.Bytes(), &feat); err != nil {
+		return nil, err
+	}
+	return &feat, nil
+}
+
 func (r *Runc) args() (out []string) {
 	if r.Root != "" {
 		out = append(out, "--root", r.Root)

runc_test.go

@@ -20,6 +20,7 @@ import (
 	"context"
 	"errors"
 	"os"
+	"os/exec"
 	"sync"
 	"syscall"
 	"testing"
@@ -334,3 +335,24 @@ func TestCreateArgs(t *testing.T) {
 		t.Fatalf("arg should be --other but got %q", a)
 	}
 }
+
+func TestRuncFeatures(t *testing.T) {
+	ctx := context.Background()
+	if _, err := exec.LookPath(DefaultCommand); err != nil {
+		t.Skipf("%q was not found in PATH", DefaultCommand)
+	}
+	runc := &Runc{}
+	feat, err := runc.Features(ctx)
+	if err != nil {
+		t.Fatal(err)
+	}
+	var rroPresent bool
+	for _, f := range feat.MountOptions {
+		if f == "rro" {
+			rroPresent = true
+		}
+	}
+	if !rroPresent {
+		t.Fatalf("\"rro\" was not found in feat.MountOptions (feat=%+v)", feat)
+	}
+}