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bug#46967: Connection reuse for substitutes breaks with gzip

From: Ludovic Courtès
Subject: bug#46967: Connection reuse for substitutes breaks with gzip
Date: Thu, 11 Mar 2021 09:26:42 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.1 (gnu/linux) 
Turns out GnuTLS has a buffer for the record layer attached to the
session.  After the first GET in the main process, it looks like this:

--8<---------------cut here---------------start------------->8---
(gdb) p session->internals.record_buffer
$9 = {head = 0x7f7370, tail = 0x7f7370, length = 1, byte_length = 16219}
(gdb) p *session->internals.record_buffer->head
$10 = {next = 0x0, prev = 0x0, mark = 165, msg = {
    data = 0x7f73c0 "HTTP/1.1 200 OK\r\nServer: nginx\r\nDate: Wed, 10 Mar 2021 
21:23:44 GMT\r\nContent-Type: text/html\r\nContent-Length: 16397\r\nConnection: 
keep-alive\r\nAccept-Ranges: bytes\r\n\r\n<!DOCTYPE html><html 
lang=\"en\"><hea"..., size = 16384}, maximum_size = 18751, uhead_mark = 0, type 
= GNUTLS_APPLICATION_DATA, record_sequence = 1, 
  epoch = 0, htype = 72, handshake_sequence = 0}
(gdb) p *(&session->internals.record_buffer->head.msg.data[165])
$11 = 60 '<'
(gdb) p (&session->internals.record_buffer->head.msg.data[165])
$12 = (unsigned char *) 0x7f7465 "<!DOCTYPE html><html 
lang=\"en\"><head><title>GNU's advanced distro and transactional package 
manager — GNU Guix</title><meta charset=\"UTF-8\" /><meta name=\"keywords\" 
content=\"GNU, Linux, Unix, Free s"...
--8<---------------cut here---------------end--------------->8---

IOW, the main process hasn’t consumed the body of the HTTP response.

This is because with ‘filtered-port’, the input port is dumped from a
child process, not from the calling process.

To be continued…

Ludo’.
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