tree-walk.c: make tree_entry_interesting() take an index

In order to support :(attr) when matching pathspec on a tree,
tree_entry_interesting() needs to take an index (because
git_check_attr() needs it). This is the preparation step for it. This
also makes it clearer what index we fall back to when looking up
attributes during an unpack-trees operation: the source index.

This also fixes revs->pruning.repo initialization that should have
been done in 2abf350385 (revision.c: remove implicit dependency on
the_index - 2018-09-21). Without it, skip_uninteresting() will
dereference a NULL pointer through this call chain

  get_revision(revs)
  get_revision_internal
  get_revision_1
  try_to_simplify_commit
  rev_compare_tree
  diff_tree_oid(..., &revs->pruning)
  ll_diff_tree_oid
  diff_tree_paths
  ll_diff_tree
  skip_uninteresting

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 6 insertions, 4 deletions

diff --git a/tree-walk.h b/tree-walk.h
index 196831007e..eefd26bb62 100644
--- a/tree-walk.h
+++ b/tree-walk.h
@@ -1,6 +1,7 @@
 #ifndef TREE_WALK_H
 #define TREE_WALK_H
 
+struct index_state;
 struct strbuf;
 
 struct name_entry {
@@ -48,7 +49,7 @@ void *fill_tree_descriptor(struct tree_desc *desc, const struct object_id *oid);
 
 struct traverse_info;
 typedef int (*traverse_callback_t)(int n, unsigned long mask, unsigned long dirmask, struct name_entry *entry, struct traverse_info *);
-int traverse_trees(int n, struct tree_desc *t, struct traverse_info *info);
+int traverse_trees(struct index_state *istate, int n, struct tree_desc *t, struct traverse_info *info);
 
 enum follow_symlinks_result {
 	FOUND = 0, /* This includes out-of-tree links */
@@ -98,8 +99,9 @@ enum interesting {
 	all_entries_interesting = 2 /* yes, and all subsequent entries will be */
 };
 
-extern enum interesting tree_entry_interesting(const struct name_entry *,
-					       struct strbuf *, int,
-					       const struct pathspec *ps);
+enum interesting tree_entry_interesting(struct index_state *istate,
+					const struct name_entry *,
+					struct strbuf *, int,
+					const struct pathspec *ps);
 
 #endif