[PATCH 4/5] index: _index_encrypted_mime_part returns success or failure

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

This change prepares us to know whether or not
_index_encrypted_mime_part succeeded or not on a given MIME part.

We don't currently make use of the information, but we will in
subsequent changes.
---
 lib/index.cc | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/lib/index.cc b/lib/index.cc
index e03f5230..29ede685 100644
--- a/lib/index.cc
+++ b/lib/index.cc
@@ -364,7 +364,7 @@ _index_content_type (notmuch_message_t *message, GMimeObject *part)
     }
 }
 
-static void
+static bool
 _index_encrypted_mime_part (notmuch_message_t *message, notmuch_indexopts_t *indexopts,
 			    GMimeContentType *content_type,
 			    GMimeObject *part);
@@ -419,6 +419,8 @@ _index_mime_part (notmuch_message_t *message,
 		_index_content_type (message,
 				     g_mime_multipart_get_part (multipart, i));
 		if (i == GMIME_MULTIPART_ENCRYPTED_CONTENT) {
+		    /* deliberately ignore return value here: if it fails to decrypt,
+		       we have nothing else to try */
 		    _index_encrypted_mime_part(message, indexopts,
 					       content_type,
 					       part);
@@ -519,8 +521,9 @@ _index_mime_part (notmuch_message_t *message,
 }
 
 /* descend (if desired) into the cleartext part of an encrypted MIME
- * part while indexing. */
-static void
+ * part while indexing.  Returns true if there was a successful
+ * decryption, false if there was not.*/
+static bool
 _index_encrypted_mime_part (notmuch_message_t *message,
 			    notmuch_indexopts_t *indexopts,
 			    g_mime_3_unused(GMimeContentType *content_type),
@@ -532,7 +535,7 @@ _index_encrypted_mime_part (notmuch_message_t *message,
     GMimeObject *clear = NULL;
 
     if (!indexopts || (notmuch_indexopts_get_decrypt_policy (indexopts) == NOTMUCH_DECRYPT_FALSE))
-	return;
+	return false;
 
     notmuch = notmuch_message_get_database (message);
 
@@ -550,7 +553,7 @@ _index_encrypted_mime_part (notmuch_message_t *message,
 	    if (status)
 		_notmuch_database_log_append (notmuch, "failed to add index.decryption "
 					      "property (%d)\n", status);
-	    return;
+	    return false;
 	}
     }
 #endif
@@ -560,7 +563,7 @@ _index_encrypted_mime_part (notmuch_message_t *message,
     clear = _notmuch_crypto_decrypt (&attempted, notmuch_indexopts_get_decrypt_policy (indexopts),
 				     message, crypto_ctx, encrypted_data, get_sk ? &decrypt_result : NULL, &err);
     if (!attempted)
-	return;
+	return false;
     if (err || !clear) {
 	if (decrypt_result)
 	    g_object_unref (decrypt_result);
@@ -576,7 +579,7 @@ _index_encrypted_mime_part (notmuch_message_t *message,
 	if (status)
 	    _notmuch_database_log_append (notmuch, "failed to add index.decryption "
 					  "property (%d)\n", status);
-	return;
+	return false;
     }
     if (decrypt_result) {
 #if HAVE_GMIME_SESSION_KEYS
@@ -597,7 +600,7 @@ _index_encrypted_mime_part (notmuch_message_t *message,
     if (status)
 	_notmuch_database_log (notmuch, "failed to add index.decryption "
 			       "property (%d)\n", status);
-
+    return true;
 }
 
 notmuch_status_t
-- 
2.15.1