Re: [PATCH 04/20] t: adapt `test_copy_bytes()` to not use Perl

> The `test_copy_bytes()` helper function copies up to N bytes from stdin
> to stdout. This is implemented using Perl, but it can be trivially
> adapted to instead use dd(1).
>
> Refactor the helper accordingly, which allows a bunch of tests to pass
> when Perl is not available.
>
> Signed-off-by: Patrick Steinhardt <ps@pks.im>
> ---
>  t/test-lib-functions.sh | 12 +-----------
>  1 file changed, 1 insertion(+), 11 deletions(-)
>
> diff --git a/t/test-lib-functions.sh b/t/test-lib-functions.sh
> index 377f08a1428..c4b4d3a4c7f 100644
> --- a/t/test-lib-functions.sh
> +++ b/t/test-lib-functions.sh
> @@ -1640,17 +1640,7 @@ test_match_signal () {
>
>  # Read up to "$1" bytes (or to EOF) from stdin and write them to stdout.
>  test_copy_bytes () {
> -	perl -e '
> -		my $len = $ARGV[1];
> -		while ($len > 0) {
> -			my $s;
> -			my $nread = sysread(STDIN, $s, $len);
> -			die "cannot read: $!" unless defined($nread);
> -			last unless $nread;
> -			print $s;
> -			$len -= $nread;
> -		}
> -	' - "$1"
> +	dd ibs=1 count="$1" 2>/dev/null
>  }
>