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Re: [Patch v1 2/3] t5318: replace use of /dev/zero with generate_zero_bytes




On Sat, Feb 9, 2019 at 2:00 PM <randall.s.becker@xxxxxxxxxx> wrote:
> This change removes the dependency on /dev/zero with generate_zero_bytes
> appending NUL values to blocks generating wrong signatures for test cases.

This commit message says what the patch does but not _why_. At
minimum, it should explain that /dev/zero is not available on all
platforms, therefore, not portable, and (perhaps) cite NonStop as an
example.

> Signed-off-by: Randall S. Becker <rsbecker@xxxxxxxxxxxxx>
> ---
> diff --git a/t/t5318-commit-graph.sh b/t/t5318-commit-graph.sh
> @@ -383,7 +383,7 @@ corrupt_graph_and_verify() {
> -       dd if=/dev/zero of="$objdir/info/commit-graph" bs=1 seek="$zero_pos" count=$(($orig_size - $zero_pos)) &&
> +       generate_zero_bytes $(($orig_size - $zero_pos)) >> "$objdir/info/commit-graph" &&