Fix app preview images disappearing

BaseBin/rootlesshooks/SpringBoard.x

@@ -2,6 +2,23 @@
 #import <substrate.h>
 #import <objc/objc.h>
 #import <libroot.h>
+#import <fcntl.h>
+
+bool stringStartsWith(const char *str, const char* prefix)
+{
+	if (!str || !prefix) {
+		return false;
+	}
+
+	size_t str_len = strlen(str);
+	size_t prefix_len = strlen(prefix);
+
+	if (str_len < prefix_len) {
+		return false;
+	}
+
+	return !strncmp(str, prefix, prefix_len);
+}
 
 @interface XBSnapshotContainerIdentity : NSObject <NSCopying>
 @property (nonatomic, readonly, copy) NSString* bundleIdentifier;
@@ -21,6 +38,33 @@
 
 %end
 
+%hookf(int, fcntl, int fildes, int cmd, ...) {
+	if (cmd == F_SETPROTECTIONCLASS) {
+		char filePath[PATH_MAX];
+		if (fcntl(fildes, F_GETPATH, filePath) != -1) {
+			// Skip setting protection class on jailbreak apps, this doesn't work and causes snapshots to not be saved correctly
+			if (stringStartsWith(filePath, JBROOT_PATH_CSTRING("/var/mobile/Library/SplashBoard/Snapshots"))) {
+				return 0;
+			}
+		}
+	}
+
+	va_list a;
+	va_start(a, cmd);
+	const char *arg1 = va_arg(a, void *);
+	const void *arg2 = va_arg(a, void *);
+	const void *arg3 = va_arg(a, void *);
+	const void *arg4 = va_arg(a, void *);
+	const void *arg5 = va_arg(a, void *);
+	const void *arg6 = va_arg(a, void *);
+	const void *arg7 = va_arg(a, void *);
+	const void *arg8 = va_arg(a, void *);
+	const void *arg9 = va_arg(a, void *);
+	const void *arg10 = va_arg(a, void *);
+	va_end(a);
+	return %orig(fildes, cmd, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9, arg10);
+}
+
 void springboardInit(void)
 {
 	%init();