Add pinentry.el for better GnuPG integration

* lisp/pinentry.el: New file.
* etc/NEWS: Add entry about pinentry.el.
* lisp/epg.el (epg--start): Set INSIDE_EMACS envvar.

Fixes: debbugs:20550

1 files changed, 6 insertions, 0 deletions

diff --git a/etc/NEWS b/etc/NEWS
index 0ed739cb606..313e1f781bb 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -771,6 +771,12 @@ use [:multibyte:] instead.
 
 * New Modes and Packages in Emacs 25.1
 
+** pinentry.el allows GnuPG passphrase to be prompted through the
+minibuffer instead of a graphical dialog, depending on whether the gpg
+command is called from Emacs (i.e., INSIDE_EMACS environment variable
+is set).  This feature requires newer versions of GnuPG (2.1.5 or
+later) and Pinentry (0.9.5 or later).
+
 ** cl-generic.el provides CLOS-style multiple-dispatch generic functions.
 
 ** scss-mode (a minor variant of css-mode)