Skip tests on Windows that attempt to bind-mount read-only

Containerd's mounter doesn't yet support bind-mounts on Windows.
BuildKit short-cuts this for read-write mounts, but not read-only
mounts.

Signed-off-by: Paul "TBBle" Hampson <Paul.Hampson@Pobox.com>

cache/contenthash/checksum_test.go

@@ -7,6 +7,7 @@ import (
 	"io/ioutil"
 	"os"
 	"path/filepath"
+	"runtime"
 	"strings"
 	"testing"
 	"time"
@@ -858,6 +859,11 @@ func TestPersistence(t *testing.T) {
 }
 
 func createRef(t *testing.T, cm cache.Manager, files []string) cache.ImmutableRef {
+	if runtime.GOOS == "windows" && len(files) > 0 {
+		// lm.Mount() will fail
+		t.Skip("Depends on unimplemented containerd bind-mount support on Windows")
+	}
+
 	mref, err := cm.New(context.TODO(), nil, cache.CachePolicyRetain)
 	require.NoError(t, err)
 

cache/manager_test.go

@@ -9,6 +9,7 @@ import (
 	"io/ioutil"
 	"os"
 	"path/filepath"
+	"runtime"
 	"testing"
 
 	"github.com/containerd/containerd/content"
@@ -269,6 +270,10 @@ func TestManager(t *testing.T) {
 }
 
 func TestSnapshotExtract(t *testing.T) {
+	if runtime.GOOS == "windows" {
+		t.Skip("Depends on unimplemented containerd bind-mount support on Windows")
+	}
+
 	t.Parallel()
 	ctx := namespaces.WithNamespace(context.Background(), "buildkit-test")
 
@@ -405,6 +410,10 @@ func TestSnapshotExtract(t *testing.T) {
 }
 
 func TestExtractOnMutable(t *testing.T) {
+	if runtime.GOOS == "windows" {
+		t.Skip("Depends on unimplemented containerd bind-mount support on Windows")
+	}
+
 	t.Parallel()
 	ctx := namespaces.WithNamespace(context.Background(), "buildkit-test")
 

source/http/httpsource_test.go

@@ -5,6 +5,7 @@ import (
 	"io/ioutil"
 	"os"
 	"path/filepath"
+	"runtime"
 	"testing"
 
 	"github.com/containerd/containerd/content/local"
@@ -25,6 +26,10 @@ import (
 )
 
 func TestHTTPSource(t *testing.T) {
+	if runtime.GOOS == "windows" {
+		t.Skip("Depends on unimplemented containerd bind-mount support on Windows")
+	}
+
 	t.Parallel()
 	ctx := context.TODO()
 
@@ -139,6 +144,10 @@ func TestHTTPSource(t *testing.T) {
 }
 
 func TestHTTPDefaultName(t *testing.T) {
+	if runtime.GOOS == "windows" {
+		t.Skip("Depends on unimplemented containerd bind-mount support on Windows")
+	}
+
 	t.Parallel()
 	ctx := context.TODO()
 
@@ -212,6 +221,10 @@ func TestHTTPInvalidURL(t *testing.T) {
 }
 
 func TestHTTPChecksum(t *testing.T) {
+	if runtime.GOOS == "windows" {
+		t.Skip("Depends on unimplemented containerd bind-mount support on Windows")
+	}
+
 	t.Parallel()
 	ctx := context.TODO()