[PATCH 01/11] support: Add support_copy_file

[Florian Weimer]

* Adhemerval Zanella via Libc-alpha:

>> +  if (ret != st.st_size)
>> +    FAIL_EXIT1 ("copying from \"%s\" to \"%s\": only %zd of %llu bytes copied",
>
> This line seems too long.

It's 79 characters long, which is the maximum according to:

  <https://sourceware.org/glibc/wiki/Style_and_Conventions#A79-Column_Lines>

>> +                from, to, ret, (unsigned long long int) st.st_size);
>> +  if (fchmod (fd_to, mode) < 0)
>> +    FAIL_EXIT1 ("fchmod on %s: %m", to);
>
> Maybe put 'to' within quotations as well?

Thanks, fixed.  Will push if it still builds.

Florian
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