Improved handling of Data Deduplication reparse points

[wimlib] / src / win32_capture.c

diff --git a/src/win32_capture.c b/src/win32_capture.c
index e9f4df0ecc56c2834de40510026cdc11a2043830..b5b8bc5c91e809240a77141678c49245979a3640 100644 (file)
--- a/src/win32_capture.c
+++ b/src/win32_capture.c
@@ -1050,6 +1050,21 @@ winnt_load_reparse_data(HANDLE h, struct wim_inode *inode,
                return WIMLIB_ERR_INVALID_REPARSE_DATA;
        }
 
+       if (le32_to_cpu(rpbuf.rptag) == WIM_IO_REPARSE_TAG_DEDUP) {
+               /*
+                * Windows treats Data Deduplication reparse points specially.
+                * Reads from the unnamed data stream actually return the
+                * redirected file contents, even with FILE_OPEN_REPARSE_POINT.
+                * Deduplicated files also cannot be properly restored without
+                * also restoring the "System Volume Information" directory,
+                * which wimlib excludes by default.  Therefore, the logical
+                * behavior for us seems to be to ignore the reparse point and
+                * treat the file as a normal file.
+                */
+               inode->i_attributes &= ~FILE_ATTRIBUTE_REPARSE_POINT;
+               return 0;
+       }
+
        if (params->add_flags & WIMLIB_ADD_FLAG_RPFIX) {
                ret = winnt_try_rpfix(&rpbuf, &rpbuflen, full_path, params);
                if (ret == RP_FIXED)