win32_apply.c: detect case-sensitive filename support

[wimlib] / src / win32_apply.c

diff --git a/src/win32_apply.c b/src/win32_apply.c
index 33c1a5dde166a0b5bf3feb60e60b7ad23b3d872b..a4f817513ea12d7c9a5b54b25ba0528c017861fa 100644 (file)
--- a/src/win32_apply.c
+++ b/src/win32_apply.c
@@ -308,8 +308,28 @@ win32_get_supported_features(const wchar_t *target,
 
        supported_features->timestamps = 1;
 
-       /* Note: Windows does not support case sensitive filenames!  At least
-        * not without changing the registry and rebooting...  */
+       if (vol_flags & FILE_CASE_SENSITIVE_SEARCH) {
+               /*
+                * The filesystem supports case-sensitive filenames.  But does
+                * the operating system as well?  This normally requires the
+                * registry setting ObCaseInsensitive=0.  We can test it
+                * indirectly by attempting to open the "\SystemRoot" symbolic
+                * link using a name with the wrong case.  If we get
+                * STATUS_OBJECT_NAME_NOT_FOUND instead of STATUS_ACCESS_DENIED,
+                * then case-sensitive names must be enabled.
+                */
+               UNICODE_STRING path;
+               OBJECT_ATTRIBUTES attr;
+               HANDLE h;
+               NTSTATUS status;
+
+               RtlInitUnicodeString(&path, L"\\systemroot");
+               InitializeObjectAttributes(&attr, &path, 0, NULL, NULL);
+
+               status = NtOpenSymbolicLinkObject(&h, 0, &attr);
+               if (status == STATUS_OBJECT_NAME_NOT_FOUND)
+                       supported_features->case_sensitive_filenames = 1;
+       }
 
        return 0;
 }