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bug#37025: [found the culprit]

From: Teemu Likonen
Subject: bug#37025: [found the culprit]
Date: Thu, 15 Aug 2019 19:08:01 +0300

Teemu Likonen [2019-08-15T07:48:24+03] wrote:

> So there should also be version checking in epg.el's epg-start-sign
> and epg-start-encrypt functions (or somewhere).

OK. Here's a patch with version checking. This patch includes everything
in the previous patch (that is, use "--sender" only with OpenPGP
protocol) and additionally this checks if gpg is at least version 2.1.15
which introduced the "--sender" option.

diff --git a/lisp/epg.el b/lisp/epg.el
index ce58c520f1..838cf6b9ea 100644
--- a/lisp/epg.el
+++ b/lisp/epg.el
@@ -1617,8 +1617,13 @@ epg-start-sign
                                      (car (epg-key-sub-key-list signer)))))
                             (epg-context-signers context)))
-                     (let ((sender (epg-context-sender context)))
-                       (when (stringp sender)
+                     (let ((sender (epg-context-sender context))
+                           (version (cdr (assq 'version (epg-find-configuration
+                                                         'OpenPGP)))))
+                       (when (and (eql 'OpenPGP (epg-context-protocol context))
+                                  (stringp version)
+                                  (version<= "2.1.15" version)
+                                  (stringp sender))
                          (list "--sender" sender)))
                      (epg-context-sig-notations context))
@@ -1714,9 +1719,15 @@ epg-start-encrypt
                                          (car (epg-key-sub-key-list
                                 (epg-context-signers context))))
-                    (if sign
-                         (let ((sender (epg-context-sender context)))
-                           (when (stringp sender)
+                    (if (and sign
+                              (eql 'OpenPGP (epg-context-protocol context)))
+                         (let ((sender (epg-context-sender context))
+                               (version (cdr (assq 'version
+                                                   (epg-find-configuration
+                                                    'OpenPGP)))))
+                           (when (and (stringp version)
+                                      (version<= "2.1.15" version)
+                                      (stringp sender))
                              (list "--sender" sender))))
                      (if sign
diff --git a/lisp/gnus/mml-sec.el b/lisp/gnus/mml-sec.el
index 07d2028534..e0ec829617 100644
--- a/lisp/gnus/mml-sec.el
+++ b/lisp/gnus/mml-sec.el
@@ -915,7 +915,7 @@ mml-secure-epg-encrypt
     (when sign
       (setq signers (mml-secure-signers context signer-names))
       (setf (epg-context-signers context) signers)
-      (when mml-secure-openpgp-sign-with-sender
+      (when (and (eq 'OpenPGP protocol) mml-secure-openpgp-sign-with-sender)
         (setf (epg-context-sender context) sender)))
     (when (eq 'OpenPGP protocol)
       (setf (epg-context-armor context) t)
@@ -945,10 +945,10 @@ mml-secure-epg-sign
         signature micalg)
     (when (eq 'OpenPGP protocol)
       (setf (epg-context-armor context) t)
-      (setf (epg-context-textmode context) t))
+      (setf (epg-context-textmode context) t)
+      (when mml-secure-openpgp-sign-with-sender
+        (setf (epg-context-sender context) sender)))
     (setf (epg-context-signers context) signers)
-    (when mml-secure-openpgp-sign-with-sender
-      (setf (epg-context-sender context) sender))
     (when (mml-secure-cache-passphrase-p protocol)

///  OpenPGP key: 4E1055DC84E9DFF613D78557719D69D324539450
//  https://keys.openpgp.org/search?q=address@hidden
/  https://keybase.io/tlikonen  https://github.com/tlikonen

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