[PATCH 2/3] lib: fix handling of one character long directory names at top level

[Jani Nikula]

The code to skip multiple slashes in _notmuch_database_split_path()
skips back one character too much. This is compensated by a +1 in the
length parameter to the strndup() call. Mostly this works fine, but if
the path is to a file under a top level directory with one character
long name, the directory part is mistaken to be part of the file name
(slash == path in code). The returned directory name will be the empty
string and the basename will be the full path, breaking the indexing
logic in notmuch new.

Fix the multiple slash skipping to keep the slash variable pointing at
the last slash, and adjust strndup() accordingly.

The bug was introduced in

commit e890b0cf4011fd9fd77ebd87343379e4a778888b
Author: Carl Worth <cworth at cworth.org>
Date:   Sat Dec 19 13:20:26 2009 -0800

    database: Store the parent ID for each directory document.

just a little over two months after the initial commit in the Notmuch
code history, making this the longest living bug in Notmuch to date.
---
 lib/database.cc  | 4 ++--
 test/T050-new.sh | 5 -----
 2 files changed, 2 insertions(+), 7 deletions(-)

diff --git a/lib/database.cc b/lib/database.cc
index 3b342f136a53..b8486f7d5271 100644
--- a/lib/database.cc
+++ b/lib/database.cc
@@ -1781,7 +1781,7 @@ _notmuch_database_split_path (void *ctx,
 
     /* Finally, skip multiple slashes. */
     while (slash != path) {
-	if (*slash != '/')
+	if (*(slash - 1) != '/')
 	    break;
 
 	--slash;
@@ -1794,7 +1794,7 @@ _notmuch_database_split_path (void *ctx,
 	    *basename = path;
     } else {
 	if (directory)
-	    *directory = talloc_strndup (ctx, path, slash - path + 1);
+	    *directory = talloc_strndup (ctx, path, slash - path);
     }
 
     return NOTMUCH_STATUS_SUCCESS;
diff --git a/test/T050-new.sh b/test/T050-new.sh
index 174715aa2781..53e02d22c383 100755
--- a/test/T050-new.sh
+++ b/test/T050-new.sh
@@ -170,7 +170,6 @@ test_expect_equal "$output" "(D) add_files, pass 3: queuing leftover directory $
 No new mail. Removed 3 messages."
 
 test_begin_subtest "One character directory at top level"
-test_subtest_known_broken
 
 generate_message [dir]=A
 generate_message [dir]=A/B
@@ -179,10 +178,6 @@ generate_message [dir]=A/B/C
 output=$(NOTMUCH_NEW --debug)
 test_expect_equal "$output" "Added 3 new messages to the database."
 
-# clean up after the broken test to not mess up other tests
-rm -rf "${MAIL_DIR}"/A
-NOTMUCH_NEW 2>&1 > /dev/null
-
 test_begin_subtest "Support single-message mbox"
 cat > "${MAIL_DIR}"/mbox_file1 <<EOF
 From test_suite at notmuchmail.org Fri Jan  5 15:43:57 2001
-- 
2.1.4