if (ret)
goto out_close_wim;
+ /* Write integrity table (optional). */
if (write_flags & WIMLIB_WRITE_FLAG_CHECK_INTEGRITY) {
if (write_flags & WIMLIB_WRITE_FLAG_CHECKPOINT_AFTER_XML) {
struct wim_header checkpoint_hdr;
if (ret)
goto out_close_wim;
} else {
+ /* No integrity table. */
zero_resource_entry(&wim->hdr.integrity);
}
+ /* Now that all information in the WIM header has been determined, the
+ * preliminary header written earlier can be overwritten, the header of
+ * the existing WIM file can be overwritten, or the final header can be
+ * written to the end of the pipable WIM. */
wim->hdr.flags &= ~WIM_HDR_FLAG_WRITE_IN_PROGRESS;
hdr_offset = 0;
if (write_flags & WIMLIB_WRITE_FLAG_HEADER_AT_END)
if (ret)
goto out_close_wim;
+ /* Possibly sync file data to disk before closing. On POSIX systems, it
+ * is necessary to do this before using rename() to overwrite an
+ * existing file with a new file. Otherwise, data loss would occur if
+ * the system is abruptly terminated when the metadata for the rename
+ * operation has been written to disk, but the new file data has not.
+ */
if (write_flags & WIMLIB_WRITE_FLAG_FSYNC) {
if (fsync(wim->out_fd.fd)) {
ERROR_WITH_ERRNO("Error syncing data to WIM file");