If the decryption policy is NOTMUCH_DECRYPT_TRUE, that means we want
to stash session keys in the database.  Note that there is currently
no way from the command line to set it this way, though, so it is not
yet included in the test suite.
---
 mime-node.c | 24 ++++++++++++++++++++----
 1 file changed, 20 insertions(+), 4 deletions(-)

diff --git a/mime-node.c b/mime-node.c
index 11df082b..75b79f98 100644
--- a/mime-node.c
+++ b/mime-node.c
@@ -197,16 +197,18 @@ node_decrypt_and_verify (mime_node_t *node, GMimeObject 
*part,
     GError *err = NULL;
     GMimeDecryptResult *decrypt_result = NULL;
     GMimeMultipartEncrypted *encrypteddata = GMIME_MULTIPART_ENCRYPTED (part);
+    notmuch_message_t *message = NULL;
 
     if (! node->decrypted_child) {
-       mime_node_t *parent;
-       for (parent = node; parent; parent = parent->parent)
-           if (parent->envelope_file)
+       for (mime_node_t *parent = node; parent; parent = parent->parent)
+           if (parent->envelope_file) {
+               message = parent->envelope_file;
                break;
+           }
 
        node->decrypted_child = _notmuch_crypto_decrypt 
(&node->decrypt_attempted,
                                                         
node->ctx->crypto->decrypt,
-                                                        parent ? 
parent->envelope_file : NULL,
+                                                        message,
                                                         cryptoctx, 
encrypteddata, &decrypt_result, &err);
     }
     if (! node->decrypted_child) {
@@ -225,6 +227,20 @@ node_decrypt_and_verify (mime_node_t *node, GMimeObject 
*part,
            g_object_ref (node->sig_list);
            set_signature_list_destructor (node);
        }
+
+#if HAVE_GMIME_SESSION_KEYS
+       if (node->ctx->crypto->decrypt == NOTMUCH_DECRYPT_TRUE && message) {
+           notmuch_database_t *db = notmuch_message_get_database (message);
+           const char *sk = g_mime_decrypt_result_get_session_key 
(decrypt_result);
+           if (db && sk) {
+               notmuch_status_t status;
+               status = notmuch_message_add_property (message, "session-key", 
sk);
+               if (status)
+                   fprintf (stderr, "Failed to stash session key in the 
database (%d) %s\n",
+                            status, notmuch_status_to_string (status));
+           }
+       }
+#endif
        g_object_unref (decrypt_result);
     }
 
-- 
2.15.1

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