Merge branch 'ds/sparse-sparse-checkout'

"sparse-checkout" learns to work well with the sparse-index
feature.

* ds/sparse-sparse-checkout:
  sparse-checkout: integrate with sparse index
  p2000: add test for 'git sparse-checkout [add|set]'
  sparse-index: complete partial expansion
  sparse-index: partially expand directories
  sparse-checkout: --no-sparse-index needs a full index
  cache-tree: implement cache_tree_find_path()
  sparse-index: introduce partially-sparse indexes
  sparse-index: create expand_index()
  t1092: stress test 'git sparse-checkout set'
  t1092: refactor 'sparse-index contents' test

1 files changed, 27 insertions, 0 deletions

diff --git a/cache-tree.c b/cache-tree.c
index 8c5e882..a92c23e 100644
--- a/cache-tree.c
+++ b/cache-tree.c
@@ -101,6 +101,33 @@ struct cache_tree_sub *cache_tree_sub(struct cache_tree *it, const char *path)
 	return find_subtree(it, path, pathlen, 1);
 }
 
+struct cache_tree *cache_tree_find_path(struct cache_tree *it, const char *path)
+{
+	const char *slash;
+	int namelen;
+	struct cache_tree_sub it_sub = {
+		.cache_tree = it,
+	};
+	struct cache_tree_sub *down = &it_sub;
+
+	while (down) {
+		slash = strchrnul(path, '/');
+		namelen = slash - path;
+		down->cache_tree->entry_count = -1;
+		if (!*slash) {
+			int pos;
+			pos = cache_tree_subtree_pos(down->cache_tree, path, namelen);
+			if (0 <= pos)
+				return down->cache_tree->down[pos]->cache_tree;
+			return NULL;
+		}
+		down = find_subtree(it, path, namelen, 0);
+		path = slash + 1;
+	}
+
+	return NULL;
+}
+
 static int do_invalidate_path(struct cache_tree *it, const char *path)
 {
 	/* a/b/c