test: prove profile diagnostics do not read symlink targets

internal/profile/diagnostic_test.go

@@ -6,6 +6,7 @@ import (
 	"strings"
 	"syscall"
 	"testing"
+	"time"
 
 	"proxyctl/internal/profile"
 )
@@ -111,6 +112,9 @@ func TestReadOnlyLoadRejectsSymlinksWithoutReadingOrChangingVictim(t *testing.T)
 			if err := os.WriteFile(victim, []byte(content), 0o640); err != nil {
 				t.Fatal(err)
 			}
+			if err := os.Chtimes(victim, time.Unix(1, 0), time.Now()); err != nil {
+				t.Fatal(err)
+			}
 			before := fileIdentity(t, victim)
 			path := test.path(t, t.TempDir(), victim)
 
@@ -121,6 +125,10 @@ func TestReadOnlyLoadRejectsSymlinksWithoutReadingOrChangingVictim(t *testing.T)
 			if strings.Contains(err.Error(), "parse Profile configuration") {
 				t.Fatalf("ReadOnlyLoad followed and parsed the victim: %v", err)
 			}
+			after := fileIdentity(t, victim)
+			if before != after {
+				t.Fatalf("victim was read or its metadata changed: before=%+v after=%+v", before, after)
+			}
 			got, readErr := os.ReadFile(victim)
 			if readErr != nil {
 				t.Fatal(readErr)
@@ -128,10 +136,6 @@ func TestReadOnlyLoadRejectsSymlinksWithoutReadingOrChangingVictim(t *testing.T)
 			if string(got) != content {
 				t.Fatalf("victim content changed to %q", got)
 			}
-			after := fileIdentity(t, victim)
-			if before != after {
-				t.Fatalf("victim metadata changed: before=%+v after=%+v", before, after)
-			}
 			if _, statErr := os.Lstat(path + ".lock"); !os.IsNotExist(statErr) {
 				t.Fatalf("ReadOnlyLoad created a lock: %v", statErr)
 			}
@@ -140,9 +144,10 @@ func TestReadOnlyLoadRejectsSymlinksWithoutReadingOrChangingVictim(t *testing.T)
 }
 
 type diagnosticFileIdentity struct {
-	mode os.FileMode
-	uid  uint32
-	gid  uint32
+	mode  os.FileMode
+	uid   uint32
+	gid   uint32
+	atime syscall.Timespec
 }
 
 func fileIdentity(t *testing.T, path string) diagnosticFileIdentity {
@@ -155,5 +160,5 @@ func fileIdentity(t *testing.T, path string) diagnosticFileIdentity {
 	if !ok {
 		t.Fatalf("stat data has type %T", info.Sys())
 	}
-	return diagnosticFileIdentity{mode: info.Mode(), uid: stat.Uid, gid: stat.Gid}
+	return diagnosticFileIdentity{mode: info.Mode(), uid: stat.Uid, gid: stat.Gid, atime: stat.Atim}
 }