[PATCH] emacs: Invoke gpg with --batch and --no-tty

[Daniel Kahn Gillmor <dkg@fifthhorseman.net>]

When invoking gpg as a backgrounded tool, it's important to let gpg
know that it is backgrounded, to avoid spurious prompts or other
breakage.

In particular, https://bugs.debian.org/913614 was a regression in
GnuPG which causes problems when importing keys without a terminal,
but gpg expects one.

Ensuring that notmuch-emacs always invokes gpg as a background process
should avoid some of these unnecessary failure.

Thanks to Justus Winter for finding this problem.

Signed-off-by: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
---
 emacs/notmuch-crypto.el | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/emacs/notmuch-crypto.el b/emacs/notmuch-crypto.el
index fc2b5301..353f721e 100644
--- a/emacs/notmuch-crypto.el
+++ b/emacs/notmuch-crypto.el
@@ -142,7 +142,7 @@ mode."
     (with-selected-window window
       (with-current-buffer buffer
 	(goto-char (point-max))
-	(call-process epg-gpg-program nil t t "--list-keys" fingerprint))
+	(call-process epg-gpg-program nil t t "--batch" "--no-tty" "--list-keys" fingerprint))
       (recenter -1))))
 
 (defun notmuch-crypto-sigstatus-error-callback (button)
@@ -153,9 +153,9 @@ mode."
     (with-selected-window window
       (with-current-buffer buffer
 	(goto-char (point-max))
-	(call-process epg-gpg-program nil t t "--recv-keys" keyid)
+	(call-process epg-gpg-program nil t t "--batch" "--no-tty" "--recv-keys" keyid)
 	(insert "\n")
-	(call-process epg-gpg-program nil t t "--list-keys" keyid))
+	(call-process epg-gpg-program nil t t "--batch" "--no-tty" "--list-keys" keyid))
       (recenter -1))
     (notmuch-show-refresh-view)))
 
-- 
2.20.1