merge(third_party/git): Merge squashed git subtree at v2.23.0 r/373

Merge commit '1b593e1ea4d2af0f6444d9a7788d5d99abd6fde5' as 'third_party/git'

1 files changed, 68 insertions, 0 deletions

diff --git a/third_party/git/cache-tree.h b/third_party/git/cache-tree.h
new file mode 100644
index 000000000000..757bbc48bca1
--- /dev/null
+++ b/third_party/git/cache-tree.h
@@ -0,0 +1,68 @@
+#ifndef CACHE_TREE_H
+#define CACHE_TREE_H
+
+#include "cache.h"
+#include "tree.h"
+#include "tree-walk.h"
+
+struct cache_tree;
+struct cache_tree_sub {
+	struct cache_tree *cache_tree;
+	int count;		/* internally used by update_one() */
+	int namelen;
+	int used;
+	char name[FLEX_ARRAY];
+};
+
+struct cache_tree {
+	int entry_count; /* negative means "invalid" */
+	struct object_id oid;
+	int subtree_nr;
+	int subtree_alloc;
+	struct cache_tree_sub **down;
+};
+
+struct cache_tree *cache_tree(void);
+void cache_tree_free(struct cache_tree **);
+void cache_tree_invalidate_path(struct index_state *, const char *);
+struct cache_tree_sub *cache_tree_sub(struct cache_tree *, const char *);
+
+void cache_tree_write(struct strbuf *, struct cache_tree *root);
+struct cache_tree *cache_tree_read(const char *buffer, unsigned long size);
+
+int cache_tree_fully_valid(struct cache_tree *);
+int cache_tree_update(struct index_state *, int);
+void cache_tree_verify(struct repository *, struct index_state *);
+
+/* bitmasks to write_cache_as_tree flags */
+#define WRITE_TREE_MISSING_OK 1
+#define WRITE_TREE_IGNORE_CACHE_TREE 2
+#define WRITE_TREE_DRY_RUN 4
+#define WRITE_TREE_SILENT 8
+#define WRITE_TREE_REPAIR 16
+
+/* error return codes */
+#define WRITE_TREE_UNREADABLE_INDEX (-1)
+#define WRITE_TREE_UNMERGED_INDEX (-2)
+#define WRITE_TREE_PREFIX_ERROR (-3)
+
+int write_index_as_tree(struct object_id *oid, struct index_state *index_state, const char *index_path, int flags, const char *prefix);
+void prime_cache_tree(struct repository *, struct index_state *, struct tree *);
+
+int cache_tree_matches_traversal(struct cache_tree *, struct name_entry *ent, struct traverse_info *info);
+
+#ifdef USE_THE_INDEX_COMPATIBILITY_MACROS
+static inline int write_cache_as_tree(struct object_id *oid, int flags, const char *prefix)
+{
+	return write_index_as_tree(oid, &the_index, get_index_file(), flags, prefix);
+}
+
+static inline int update_main_cache_tree(int flags)
+{
+	if (!the_index.cache_tree)
+		the_index.cache_tree = cache_tree();
+	return cache_tree_update(&the_index, flags);
+}
+#endif
+
+#endif