bug#31457: 27.0.50; Move starttls.el and tls.el to lisp/obsolete/

[Noam Postavsky <npostavs@gmail.com>]

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Tags: patch
Severity: minor

Use of an external program such as gnutls-cli instead of the builtin
libgnutls based functions is already de-facto obsolete: see bugs 15905,
23759, 27658, and 31339.


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From e87446e3f1cdecbb270337fe158a702615b5ac54 Mon Sep 17 00:00:00 2001
From: Noam Postavsky <npostavs@gmail.com>
Date: Thu, 13 Jul 2017 08:52:39 -0400
Subject: [PATCH v1] Move tls.el and starttls.el to lisp/obsolete/

* lisp/obsolete/tls.el: Moved from lisp/net/tls.el.
* lisp/gnus/nnimap.el:
* lisp/url/url-http.el: Don't require tls, since it's obsolete.
* lisp/net/network-stream.el: Only require tls if we actually try to
use it (i.e., when (gnutls-available-p) returns nil).  Declare some
functions to fix compilation warnings.

* lisp/obsolete/starttls.el: Moved from lisp/net/starttls.el.
* lisp/net/sieve-manage.el:
* lisp/net/network-stream.el: Don't require `starttls' at the
top-level, declare the variables and functions used instead.
(network-stream-open-starttls): Only require `starttls' if
needed (i.e., gnutls-available-p fails).

* etc/NEWS: Announce obsoletion.
---
 etc/NEWS                           |  3 +++
 lisp/gnus/nnimap.el                |  1 -
 lisp/net/network-stream.el         | 22 ++++++++++++++++++----
 lisp/net/sieve-manage.el           |  1 -
 lisp/{net => obsolete}/starttls.el |  0
 lisp/{net => obsolete}/tls.el      |  0
 lisp/url/url-http.el               |  1 -
 7 files changed, 21 insertions(+), 7 deletions(-)
 rename lisp/{net => obsolete}/starttls.el (100%)
 rename lisp/{net => obsolete}/tls.el (100%)

diff --git a/etc/NEWS b/etc/NEWS
index 77ef3f3457..8193545d9f 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -419,6 +419,9 @@ or NextCloud hosted files and directories.
 ** The options.el library has been removed.
 It was obsolete since Emacs 22.1, replaced by customize.
 
+** The tls.el and starttls.el libraries are now marked obsolete.
+Use of builtin of function based on libgnutls is recommended instead.
+
 \f
 ** Message
 
diff --git a/lisp/gnus/nnimap.el b/lisp/gnus/nnimap.el
index dc51b5f0f0..3b39731927 100644
--- a/lisp/gnus/nnimap.el
+++ b/lisp/gnus/nnimap.el
@@ -36,7 +36,6 @@
 (require 'nnoo)
 (require 'netrc)
 (require 'utf7)
-(require 'tls)
 (require 'parse-time)
 (require 'nnmail)
 
diff --git a/lisp/net/network-stream.el b/lisp/net/network-stream.el
index 19e0c6421f..a0589e25a4 100644
--- a/lisp/net/network-stream.el
+++ b/lisp/net/network-stream.el
@@ -42,14 +42,20 @@
 
 ;;; Code:
 
-(require 'tls)
-(require 'starttls)
 (require 'auth-source)
 (require 'nsm)
 (require 'puny)
 
+(declare-function starttls-available-p "starttls" ())
+(declare-function starttls-negotiate "starttls" (process))
+
 (autoload 'gnutls-negotiate "gnutls")
 (autoload 'open-gnutls-stream "gnutls")
+(defvar starttls-extra-arguments)
+(defvar starttls-extra-args)
+(defvar starttls-use-gnutls)
+(defvar starttls-gnutls-program)
+(defvar starttls-program)
 
 ;;;###autoload
 (defun open-network-stream (name buffer host service &rest parameters)
@@ -255,7 +261,8 @@ network-stream-open-starttls
 		     (or (gnutls-available-p)
 			 (and (or require-tls
 				  (plist-get parameters :use-starttls-if-possible))
-			      (starttls-available-p))))
+			      (require 'starttls)
+                              (starttls-available-p))))
 	       (not (eq (plist-get parameters :type) 'plain)))
       ;; If using external STARTTLS, drop this connection and start
       ;; anew with `starttls-open-stream'.
@@ -336,7 +343,8 @@ network-stream-open-starttls
 	      ;; See `starttls-available-p'.  If this predicate
 	      ;; changes to allow running under Windows, the error
 	      ;; message below should be amended.
-	      (if (memq system-type '(windows-nt ms-dos))
+	      (if (or (memq system-type '(windows-nt ms-dos))
+                      (not (featurep 'starttls)))
 		  (concat "Emacs does not support TLS")
 		(concat "Emacs does not support TLS, and no external `"
 			(if starttls-use-gnutls
@@ -373,6 +381,8 @@ network-stream-get-response
 	(unless (= start (point))
 	  (buffer-substring start (point)))))))
 
+(declare-function open-tls-stream "tls" (name buffer host port))
+
 (defun network-stream-open-tls (name buffer host service parameters)
   (with-current-buffer buffer
     (let* ((start (point-max))
@@ -380,6 +390,7 @@ network-stream-open-tls
             (if (gnutls-available-p)
                 (open-gnutls-stream name buffer host service
                                     (plist-get parameters :nowait))
+              (require 'tls)
               (open-tls-stream name buffer host service)))
 	   (eoc (plist-get parameters :end-of-command)))
       (if (plist-get parameters :nowait)
@@ -406,6 +417,9 @@ network-stream-open-tls
                   (network-stream-command stream capability-command eo-capa)
                   'tls)))))))
 
+(declare-function format-spec "format-spec" (format spec))
+(declare-function format-spec-make "format-spec" (&rest pairs))
+
 (defun network-stream-open-shell (name buffer host service parameters)
   (require 'format-spec)
   (let* ((capability-command (plist-get parameters :capability-command))
diff --git a/lisp/net/sieve-manage.el b/lisp/net/sieve-manage.el
index cd40307238..8c70ae037a 100644
--- a/lisp/net/sieve-manage.el
+++ b/lisp/net/sieve-manage.el
@@ -77,7 +77,6 @@
 
 (eval-when-compile (require 'cl-lib))
 (require 'sasl)
-(require 'starttls)
 (autoload 'sasl-find-mechanism "sasl")
 (autoload 'auth-source-search "auth-source")
 
diff --git a/lisp/net/starttls.el b/lisp/obsolete/starttls.el
similarity index 100%
rename from lisp/net/starttls.el
rename to lisp/obsolete/starttls.el
diff --git a/lisp/net/tls.el b/lisp/obsolete/tls.el
similarity index 100%
rename from lisp/net/tls.el
rename to lisp/obsolete/tls.el
diff --git a/lisp/url/url-http.el b/lisp/url/url-http.el
index 0b95453b30..53798f77c3 100644
--- a/lisp/url/url-http.el
+++ b/lisp/url/url-http.el
@@ -1600,7 +1600,6 @@ url-http-options
 
 ;; HTTPS.  This used to be in url-https.el, but that file collides
 ;; with url-http.el on systems with 8-character file names.
-(require 'tls)
 
 (defconst url-https-asynchronous-p t "HTTPS retrievals are asynchronous.")
 
-- 
2.11.0