pkg/host: support trial supported syscall detection

Detect supported syscall by directly executing them
if kallsyms is not present. This is required for gvisor testing.

1 files changed, 30 insertions, 22 deletions

diff --git a/pkg/host/host_test.go b/pkg/host/host_test.go
index 8a16d5e5d..c44b9bbce 100644
--- a/pkg/host/host_test.go
+++ b/pkg/host/host_test.go
@@ -4,6 +4,7 @@
 package host
 
 import (
+	"fmt"
 	"runtime"
 	"testing"
 
@@ -13,28 +14,35 @@ import (
 
 func TestDetectSupportedSyscalls(t *testing.T) {
 	t.Parallel()
-	target, err := prog.GetTarget(runtime.GOOS, runtime.GOARCH)
-	if err != nil {
-		t.Fatal(err)
-	}
-	// Dump for manual inspection.
-	supp, disabled, err := DetectSupportedSyscalls(target, "none")
-	if err != nil {
-		t.Skipf("skipping: %v", err)
-	}
-	for c, ok := range supp {
-		if !ok {
-			t.Fatalf("map contains false value for %v", c.Name)
-		}
-	}
-	t.Logf("unsupported:")
-	for c, reason := range disabled {
-		t.Logf("%v: %v", c.Name, reason)
-	}
-	_, disabled = target.TransitivelyEnabledCalls(supp)
-	t.Logf("\n\ntransitively unsupported:")
-	for c, reason := range disabled {
-		t.Logf("%v: %v", c.Name, reason)
+	for _, fallback := range []bool{false, true} {
+		t.Run(fmt.Sprintf("fallback=%v", fallback), func(t *testing.T) {
+			oldFallback := testFallback
+			testFallback = fallback
+			defer func() { testFallback = oldFallback }()
+			target, err := prog.GetTarget(runtime.GOOS, runtime.GOARCH)
+			if err != nil {
+				t.Fatal(err)
+			}
+			// Dump for manual inspection.
+			supp, disabled, err := DetectSupportedSyscalls(target, "none")
+			if err != nil {
+				t.Fatal(err)
+			}
+			for c, ok := range supp {
+				if !ok {
+					t.Fatalf("map contains false value for %v", c.Name)
+				}
+			}
+			t.Logf("unsupported:")
+			for c, reason := range disabled {
+				t.Logf("%v: %v", c.Name, reason)
+			}
+			_, disabled = target.TransitivelyEnabledCalls(supp)
+			t.Logf("\n\ntransitively unsupported:")
+			for c, reason := range disabled {
+				t.Logf("%v: %v", c.Name, reason)
+			}
+		})
 	}
 }