pkt-line: Make packet_read_line easier to debug

When there is an error parsing the 4 byte length component we now
display it as part of the die message, this may hint as to what
data was misunderstood by the application.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/pkt-line.c b/pkt-line.c
index bd603f8721704305c2ce4608a09df38ed4bc55a0..295ba2b16c8675d8c5c5d0a5ee6e61e044ce99dd 100644 (file)
--- a/pkt-line.c
+++ b/pkt-line.c
@@ -129,7 +129,7 @@ int packet_read_line(int fd, char *buffer, unsigned size)
        safe_read(fd, linelen, 4);
        len = packet_length(linelen);
        if (len < 0)
-               die("protocol error: bad line length character");
+               die("protocol error: bad line length character: %.4s", linelen);
        if (!len)
                return 0;
        len -= 4;