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#! /bin/sh /usr/share/dpatch/dpatch-run
@DPATCH@
Index: b/src/dd.c
===================================================================
--- a/src/dd.c
+++ b/src/dd.c
@@ -1422,6 +1422,9 @@ scanargs (int argc, char *const *argv)
if (multiple_bits_set (input_flags & (O_DIRECT | O_NOCACHE))
|| multiple_bits_set (output_flags & (O_DIRECT | O_NOCACHE)))
error (EXIT_FAILURE, 0, _("cannot combine direct and nocache"));
+ if ((output_flags & O_APPEND) &&
+ ((conversions_mask & C_NOTRUNC) != C_NOTRUNC))
+ error (0, 0, _("you probably want conv=notrunc with oflag=append"));
if (input_flags & O_NOCACHE)
{
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