Re: [PATCH] pkt-line: do not chomp EOL for sideband progress info

> In the protocol negotiation stage, we need to turn on the flag
> "PACKET_READ_CHOMP_NEWLINE" to chomp EOL for each packet line from
> client or server. But when receiving data and progress information
> using sideband, we will turn off the flag "PACKET_READ_CHOMP_NEWLINE"
> to prevent mangling EOLs from data and progress information.
>
> When both the server and the client support "sideband-all" capability,
> we have a dilemma that EOLs in negotiation packets should be trimmed,
> but EOLs in progress infomation should be leaved as is.
>
> Move the logic of chomping EOLs from "packet_read_with_status()" to
> "packet_reader_read()" can resolve this dilemma.
>
> Signed-off-by: Jiang Xin <zhiyou.jx@alibaba-inc.com>
> ---
>  pkt-line.c | 19 ++++++++++++++++---
>  1 file changed, 16 insertions(+), 3 deletions(-)
>
> diff --git a/pkt-line.c b/pkt-line.c
> index af83a19f4d..d6d08b6aa6 100644
> --- a/pkt-line.c
> +++ b/pkt-line.c
> @@ -597,12 +597,18 @@ void packet_reader_init(struct packet_reader *reader, int fd,
>  enum packet_read_status packet_reader_read(struct packet_reader *reader)
>  {
>  	struct strbuf scratch = STRBUF_INIT;
> +	int options = reader->options;
>  
>  	if (reader->line_peeked) {
>  		reader->line_peeked = 0;
>  		return reader->status;
>  	}
>  
> +	/* Do not chomp newlines for sideband progress and error messages */
> +	if (reader->use_sideband && options & PACKET_READ_CHOMP_NEWLINE) {
> +		options &= ~PACKET_READ_CHOMP_NEWLINE;
> +	}
> +
>  	/*
>  	 * Consume all progress packets until a primary payload packet is
>  	 * received
> @@ -615,7 +621,7 @@ enum packet_read_status packet_reader_read(struct packet_reader *reader)
>  							 reader->buffer,
>  							 reader->buffer_size,
>  							 &reader->pktlen,
> -							 reader->options);
> +							 options);
>  		if (!reader->use_sideband)
>  			break;
>  		if (demultiplex_sideband(reader->me, reader->status,
> @@ -624,12 +630,19 @@ enum packet_read_status packet_reader_read(struct packet_reader *reader)
>  			break;
>  	}
>  
> -	if (reader->status == PACKET_READ_NORMAL)
> +	if (reader->status == PACKET_READ_NORMAL) {
>  		/* Skip the sideband designator if sideband is used */
>  		reader->line = reader->use_sideband ?
>  			reader->buffer + 1 : reader->buffer;
> -	else
> +
> +		if ((reader->options & PACKET_READ_CHOMP_NEWLINE) &&
> +		    reader->buffer[reader->pktlen - 1] == '\n') {
> +			reader->buffer[reader->pktlen - 1] = 0;
> +			reader->pktlen--;
> +		}
> +	} else {
>  		reader->line = NULL;
> +	}
>  
>  	return reader->status;
>  }