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$ mkdir patches
$ quilt new test.diff
> Patch %{P}test.diff is now on top
$ cat > test.txt
< This is test.txt.
$ quilt add test.txt
> File test.txt added to patch %{P}test.diff
What happens when diff fails because of a permission error?
$ chmod -r test.txt
$ quilt refresh
>~ .*diff: test\.txt: Permission denied
> Diff failed on file 'test.txt', aborting
$ echo %{?}
> 1
$ chmod +r test.txt
What happens on binary files?
$ printf "\\002\\000\\001" > test.bin
$ quilt add test.bin
> File test.bin added to patch %{P}test.diff
$ printf "\\003\\000\\001" > test.bin
$ quilt diff -pab --no-index 2>/dev/null
>~ (Files|Binary files) a/test\.bin and b/test\.bin differ
$ quilt diff -pab --no-index >/dev/null
> Diff failed on file 'test.bin', aborting
$ echo %{?}
> 1
$ quilt refresh
> Diff failed on file 'test.bin', aborting
$ echo %{?}
> 1
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