From: Daniel Kahn Gillmor Date: Sat, 9 Apr 2016 01:54:48 +0000 (+2100) Subject: [PATCH v4 3/7] fix thread breakage via ghost-on-removal X-Git-Url: http://git.tremily.us/?a=commitdiff_plain;h=554c59fbb969ac54e9717d46ebf8882785ab524d;p=notmuch-archives.git [PATCH v4 3/7] fix thread breakage via ghost-on-removal --- diff --git a/55/a531851feeb9e2286999b3ce679e863f564ef9 b/55/a531851feeb9e2286999b3ce679e863f564ef9 new file mode 100644 index 000000000..728bb6b1e --- /dev/null +++ b/55/a531851feeb9e2286999b3ce679e863f564ef9 @@ -0,0 +1,167 @@ +Return-Path: +X-Original-To: notmuch@notmuchmail.org +Delivered-To: notmuch@notmuchmail.org +Received: from localhost (localhost [127.0.0.1]) + by arlo.cworth.org (Postfix) with ESMTP id DCDAB6DE035F + for ; Fri, 8 Apr 2016 18:55:32 -0700 (PDT) +X-Virus-Scanned: Debian amavisd-new at cworth.org +X-Spam-Flag: NO +X-Spam-Score: 0 +X-Spam-Level: +X-Spam-Status: No, score=0 tagged_above=-999 required=5 tests=[AWL=0.000] + autolearn=disabled +Received: from arlo.cworth.org ([127.0.0.1]) + by localhost (arlo.cworth.org [127.0.0.1]) (amavisd-new, port 10024) + with ESMTP id mtrx5Qx8H29X for ; + Fri, 8 Apr 2016 18:55:24 -0700 (PDT) +Received: from che.mayfirst.org (che.mayfirst.org [209.234.253.108]) + by arlo.cworth.org (Postfix) with ESMTP id 5C0176DE0319 + for ; Fri, 8 Apr 2016 18:55:08 -0700 (PDT) +Received: from fifthhorseman.net (unknown [201.140.212.132]) + by che.mayfirst.org (Postfix) with ESMTPSA id 333E710070 + for ; Fri, 8 Apr 2016 21:55:06 -0400 (EDT) +Received: by fifthhorseman.net (Postfix, from userid 1000) + id 4F4291FF50; Fri, 8 Apr 2016 22:54:52 -0300 (ART) +From: Daniel Kahn Gillmor +To: Notmuch Mail +Subject: [PATCH v4 3/7] fix thread breakage via ghost-on-removal +Date: Fri, 8 Apr 2016 22:54:48 -0300 +Message-Id: <1460166892-29721-3-git-send-email-dkg@fifthhorseman.net> +X-Mailer: git-send-email 2.8.0.rc3 +In-Reply-To: <1460166892-29721-1-git-send-email-dkg@fifthhorseman.net> +References: <1459445693-3900-1-git-send-email-dkg@fifthhorseman.net> + <1460166892-29721-1-git-send-email-dkg@fifthhorseman.net> +X-BeenThere: notmuch@notmuchmail.org +X-Mailman-Version: 2.1.20 +Precedence: list +List-Id: "Use and development of the notmuch mail system." + +List-Unsubscribe: , + +List-Archive: +List-Post: +List-Help: +List-Subscribe: , + +X-List-Received-Date: Sat, 09 Apr 2016 01:55:33 -0000 + +implement ghost-on-removal, the solution to T590-thread-breakage.sh +that just adds a ghost message after removing each message. + +It leaks information about whether we've ever seen a given message id, +but it's a fairly simple implementation. + +Note that _resolve_message_id_to_thread_id already introduces new +message_ids to the database, so i think just searching for a given +message ID may introduce the same metadata leakage. +--- + lib/message.cc | 30 +++++++++++++++++++++++++++--- + test/T590-thread-breakage.sh | 25 ++++++++++++------------- + 2 files changed, 39 insertions(+), 16 deletions(-) + +diff --git a/lib/message.cc b/lib/message.cc +index 8d72ea2..435b78a 100644 +--- a/lib/message.cc ++++ b/lib/message.cc +@@ -1037,20 +1037,44 @@ _notmuch_message_sync (notmuch_message_t *message) + message->modified = FALSE; + } + +-/* Delete a message document from the database. */ ++/* Delete a message document from the database, leaving a ghost ++ * message in its place */ + notmuch_status_t + _notmuch_message_delete (notmuch_message_t *message) + { + notmuch_status_t status; + Xapian::WritableDatabase *db; ++ const char *mid, *tid; ++ notmuch_message_t *ghost; ++ notmuch_private_status_t private_status; ++ notmuch_database_t *notmuch; ++ ++ mid = notmuch_message_get_message_id (message); ++ tid = notmuch_message_get_thread_id (message); ++ notmuch = message->notmuch; + + status = _notmuch_database_ensure_writable (message->notmuch); + if (status) + return status; + +- db = static_cast (message->notmuch->xapian_db); ++ db = static_cast (notmuch->xapian_db); + db->delete_document (message->doc_id); +- return NOTMUCH_STATUS_SUCCESS; ++ ++ /* and reintroduce a ghost in its place */ ++ ghost = _notmuch_message_create_for_message_id (notmuch, mid, &private_status); ++ if (private_status == NOTMUCH_PRIVATE_STATUS_NO_DOCUMENT_FOUND) { ++ private_status = _notmuch_message_initialize_ghost (ghost, tid); ++ if (! private_status) ++ _notmuch_message_sync (ghost); ++ } else if (private_status == NOTMUCH_PRIVATE_STATUS_SUCCESS) { ++ /* this is deeply weird, and we should not have gotten into ++ this state. is there a better error message to return ++ here? */ ++ return NOTMUCH_STATUS_DUPLICATE_MESSAGE_ID; ++ } ++ ++ notmuch_message_destroy (ghost); ++ return COERCE_STATUS (private_status, "Error converting to ghost message"); + } + + /* Transform a blank message into a ghost message. The caller must +diff --git a/test/T590-thread-breakage.sh b/test/T590-thread-breakage.sh +index 2b933f6..81f27db 100755 +--- a/test/T590-thread-breakage.sh ++++ b/test/T590-thread-breakage.sh +@@ -96,20 +96,11 @@ notmuch new >/dev/null + test_thread_count 1 'First message removed: still only one thread' + test_content_count apple 0 + test_content_count banana 1 +-test_begin_subtest 'should be one ghost after first message removed' +-test_subtest_known_broken +-ghosts=$(../ghost-report ${MAIL_DIR}/.notmuch/xapian) +-test_expect_equal "$ghosts" "1" ++test_ghost_count 1 'should be one ghost after first message removed' + + message_a + notmuch new >/dev/null +-# this is known to fail (it shows 2 threads) because no "ghost +-# message" was created for message A when it was removed from the +-# index, despite message B still pointing to it. +-test_begin_subtest 'First message reappears: should return to the same thread' +-test_subtest_known_broken +-count=$(notmuch count --output=threads) +-test_expect_equal "$count" "1" ++test_thread_count 1 'First message reappears: should return to the same thread' + test_content_count apple 1 + test_content_count banana 1 + test_ghost_count 0 +@@ -119,13 +110,21 @@ notmuch new >/dev/null + test_thread_count 1 'Removing second message: still only one thread' + test_content_count apple 1 + test_content_count banana 0 +-test_ghost_count 0 'No ghosts should remain after deletion of second message' ++test_begin_subtest 'No ghosts should remain after deletion of second message' ++# this is known to fail; we are leaking ghost messages deliberately ++test_subtest_known_broken ++ghosts=$(../ghost-report ${MAIL_DIR}/.notmuch/xapian) ++test_expect_equal "$ghosts" "0" + + rm -f ${MAIL_DIR}/cur/a + notmuch new >/dev/null + test_thread_count 0 'All messages gone: no threads' + test_content_count apple 0 + test_content_count banana 0 +-test_ghost_count 0 ++test_begin_subtest 'No ghosts should remain after full thread deletion' ++# this is known to fail; we are leaking ghost messages deliberately ++test_subtest_known_broken ++ghosts=$(../ghost-report ${MAIL_DIR}/.notmuch/xapian) ++test_expect_equal "$ghosts" "0" + + test_done +-- +2.8.0.rc3 +