[PATCH v3 04/13] dir: add a usage note to exclude_per_dir

["Elijah Newren via GitGitGadget" <gitgitgadget@gmail.com>]

From: Elijah Newren <newren@gmail.com>

As evidenced by the fix a couple commits ago, places in the code using
exclude_per_dir are likely buggy and should be adapted to call
setup_standard_excludes() instead.  Unfortunately, the usage of
exclude_per_dir has been hardcoded into the arguments ls-files accepts,
so we cannot actually remove it.  Add a note that it is deprecated and
no other callers should use it directly.

Signed-off-by: Elijah Newren <newren@gmail.com>
---
 dir.h | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/dir.h b/dir.h
index 33fd848fc8d..2196e12630c 100644
--- a/dir.h
+++ b/dir.h
@@ -295,8 +295,12 @@ struct dir_struct {
 	struct untracked_cache *untracked;
 
 	/**
-	 * The name of the file to be read in each directory for excluded files
-	 * (typically `.gitignore`).
+	 * Deprecated: ls-files is the only allowed caller; all other callers
+	 * should leave this as NULL; it pre-dated the
+	 * setup_standard_excludes() mechanism that replaces this.
+	 *
+	 * This field tracks the name of the file to be read in each directory
+	 * for excluded files (typically `.gitignore`).
 	 */
 	const char *exclude_per_dir;
 
-- 
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