Re: [PATCH v2 4/5] tests: replace remaining packetize() with "test-tool pkt-line"

[Jeff King <peff@peff.net>]

On Mon, Jul 12, 2021 at 06:44:19PM +0200, Ævar Arnfjörð Bjarmason wrote:

> Move the only remaining users of "packetize()" over to "test-tool
> pkt-line", for this we need a new "pack-raw-stdin" subcommand in the
> test-tool. The "pack" command takes input on stdin, but splits it by
> "\n", furthermore we'll format the output using C-strings, so the
> embedded "\0" being tested for here would cause the string to be
> truncated.
> 
> So we need another mode that just calls packet_write() on the raw
> input we got on stdin.

Makes sense. Lacking this "raw" version was the sticking point in the
past for using the helper in more places.

> +static void pack_raw_stdin(void)
> +{
> +	struct strbuf sb = STRBUF_INIT;
> +	strbuf_read(&sb, 0, 0);
> +	if (strbuf_read(&sb, 0, 0) < 0)
> +		die_errno("failed to read from stdin");

What's up with the two reads here?

It looks like just a duplication. And it happens to work because each
one tries to read to eof, making the second one generally a noop.

> diff --git a/t/t5570-git-daemon.sh b/t/t5570-git-daemon.sh
> index 2dde0348816..b52afb0cdea 100755
> --- a/t/t5570-git-daemon.sh
> +++ b/t/t5570-git-daemon.sh
> @@ -193,10 +193,12 @@ test_expect_success 'hostname cannot break out of directory' '
>  '
>  
>  test_expect_success FAKENC 'hostname interpolation works after LF-stripping' '
> -	{
> -		printf "git-upload-pack /interp.git\n\0host=localhost" | packetize
> -		printf "0000"
> -	} >input &&
> +	printf "git-upload-pack /interp.git\n\0host=localhost" >has-null &&
> +	test-tool pkt-line pack-raw-stdin >input <has-null &&
> +	test-tool pkt-line pack >>input <<-\EOF &&
> +	0000
> +	EOF

This is a minor style nit, but I really prefer redirecting output from
a block (as in the original) rather than iterative appending (in the
result). IMHO it makes it more obvious what is going into the file and
what is not.

I.e.:

  {
          printf "git-upload-pack /interp.git\n\0host=localhost" |
	  test-tool pkt-line pack-raw-stdin &&
	  printf "0000" | test-tool pkt-line pack
  } >input

(again here the packing of "0000" is pointless, but I'm OK with it for
consistency).

-Peff