dir: hide untracked contents of untracked dirs

When we taught read_directory_recursive() to recurse into untracked
directories in search of ignored files given DIR_SHOW_IGNORED_TOO, that
had the side effect of teaching it to collect the untracked contents of
untracked directories. It doesn't always make sense to return these,
though (we do need them for `clean -d`), so we introduce a flag
(DIR_KEEP_UNTRACKED_CONTENTS) to control whether or not read_directory()
strips dir->entries of the untracked contents of untracked dirs.

We also introduce check_contains() to check if one dir_entry corresponds
to a path which contains the path corresponding to another dir_entry.

This also fixes known breakages in t7061, since status --ignored now
searches untracked directories for ignored files.

Signed-off-by: Samuel Lijin <sxlijin@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/dir.h b/dir.h
index bf23a470af..650e54bdf6 100644
--- a/dir.h
+++ b/dir.h
@@ -151,7 +151,8 @@ struct dir_struct {
 		DIR_NO_GITLINKS = 1<<3,
 		DIR_COLLECT_IGNORED = 1<<4,
 		DIR_SHOW_IGNORED_TOO = 1<<5,
-		DIR_COLLECT_KILLED_ONLY = 1<<6
+		DIR_COLLECT_KILLED_ONLY = 1<<6,
+		DIR_KEEP_UNTRACKED_CONTENTS = 1<<7
 	} flags;
 	struct dir_entry **entries;
 	struct dir_entry **ignored;