Reduce snapshot compression test races

Author: sjmiller609

lib/forkvm/copy.go

@@ -42,6 +42,9 @@ func CopyGuestDirectory(srcDir, dstDir string) error {
 		if d.IsDir() && shouldSkipDirectory(relPath) {
 			return filepath.SkipDir
 		}
+		if shouldSkipRegularFile(relPath) {
+			return nil
+		}
 
 		dstPath := filepath.Join(dstDir, relPath)
 		info, err := d.Info()
@@ -58,9 +61,6 @@ func CopyGuestDirectory(srcDir, dstDir string) error {
 			return nil
 
 		case mode.IsRegular():
-			if shouldSkipRegularFile(relPath) {
-				return nil
-			}
 			if err := copyRegularFileSparse(path, dstPath, mode.Perm()); err != nil {
 				return fmt.Errorf("copy file %s: %w", path, err)
 			}

lib/instances/compression_integration_linux_test.go

@@ -33,8 +33,6 @@ type compressionIntegrationHarness struct {
 }
 
 func TestCloudHypervisorStandbyRestoreCompressionScenarios(t *testing.T) {
-	t.Parallel()
-
 	runStandbyRestoreCompressionScenarios(t, compressionIntegrationHarness{
 		name:       "cloud-hypervisor",
 		hypervisor: hypervisor.TypeCloudHypervisor,
@@ -50,8 +48,6 @@ func TestCloudHypervisorStandbyRestoreCompressionScenarios(t *testing.T) {
 }
 
 func TestFirecrackerStandbyRestoreCompressionScenarios(t *testing.T) {
-	t.Parallel()
-
 	runStandbyRestoreCompressionScenarios(t, compressionIntegrationHarness{
 		name:       "firecracker",
 		hypervisor: hypervisor.TypeFirecracker,
@@ -63,8 +59,6 @@ func TestFirecrackerStandbyRestoreCompressionScenarios(t *testing.T) {
 }
 
 func TestQEMUStandbyRestoreCompressionScenarios(t *testing.T) {
-	t.Parallel()
-
 	runStandbyRestoreCompressionScenarios(t, compressionIntegrationHarness{
 		name:       "qemu",
 		hypervisor: hypervisor.TypeQEMU,