[PATCH 1/4] revision.c: move read_cache() out of add_index_objects_to_pending()

["Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>]

A library function like this should not change global state like
the_index. Granted, read_cache() will not re-read from $GIT_DIR/index
and lose all in-core changes if the index is dirty (i.e. no bad side
effects). But that sort of detail should not be relied on here.

Make the function take the index object from outside instead. The
caller will be responsible for reading index files if necessary.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 reachable.c |  3 ++-
 revision.c  | 15 ++++++++-------
 revision.h  |  4 +++-
 3 files changed, 13 insertions(+), 9 deletions(-)

diff --git a/reachable.c b/reachable.c
index d0199ca..15dbe60 100644
--- a/reachable.c
+++ b/reachable.c
@@ -170,7 +170,8 @@ void mark_reachable_objects(struct rev_info *revs, int mark_reflog,
 	revs->tree_objects = 1;
 
 	/* Add all refs from the index file */
-	add_index_objects_to_pending(revs, 0);
+	read_cache();
+	add_index_objects_to_pending(revs, 0, &the_index);
 
 	/* Add all external refs */
 	for_each_ref(add_one_ref, revs);
diff --git a/revision.c b/revision.c
index d30d1c4..bbb6ff1 100644
--- a/revision.c
+++ b/revision.c
@@ -1275,13 +1275,13 @@ static void add_cache_tree(struct cache_tree *it, struct rev_info *revs,
 
 }
 
-void add_index_objects_to_pending(struct rev_info *revs, unsigned flags)
+void add_index_objects_to_pending(struct rev_info *revs, unsigned flags,
+				  const struct index_state *istate)
 {
 	int i;
 
-	read_cache();
-	for (i = 0; i < active_nr; i++) {
-		struct cache_entry *ce = active_cache[i];
+	for (i = 0; i < istate->cache_nr; i++) {
+		const struct cache_entry *ce = istate->cache[i];
 		struct blob *blob;
 
 		if (S_ISGITLINK(ce->ce_mode))
@@ -1294,9 +1294,9 @@ void add_index_objects_to_pending(struct rev_info *revs, unsigned flags)
 					     ce->ce_mode, ce->name);
 	}
 
-	if (active_cache_tree) {
+	if (istate->cache_tree) {
 		struct strbuf path = STRBUF_INIT;
-		add_cache_tree(active_cache_tree, revs, &path);
+		add_cache_tree(istate->cache_tree, revs, &path);
 		strbuf_release(&path);
 	}
 }
@@ -2106,7 +2106,8 @@ static int handle_revision_pseudo_opt(const char *submodule,
 	} else if (!strcmp(arg, "--reflog")) {
 		add_reflogs_to_pending(revs, *flags);
 	} else if (!strcmp(arg, "--indexed-objects")) {
-		add_index_objects_to_pending(revs, *flags);
+		read_cache();
+		add_index_objects_to_pending(revs, *flags, &the_index);
 	} else if (!strcmp(arg, "--not")) {
 		*flags ^= UNINTERESTING | BOTTOM;
 	} else if (!strcmp(arg, "--no-walk")) {
diff --git a/revision.h b/revision.h
index 9fac1a6..d06d098 100644
--- a/revision.h
+++ b/revision.h
@@ -29,6 +29,7 @@ struct rev_info;
 struct log_info;
 struct string_list;
 struct saved_parents;
+struct index_state;
 
 struct rev_cmdline_info {
 	unsigned int nr;
@@ -271,7 +272,8 @@ extern void add_pending_sha1(struct rev_info *revs,
 
 extern void add_head_to_pending(struct rev_info *);
 extern void add_reflogs_to_pending(struct rev_info *, unsigned int flags);
-extern void add_index_objects_to_pending(struct rev_info *, unsigned int flags);
+extern void add_index_objects_to_pending(struct rev_info *, unsigned int flags,
+					 const struct index_state *);
 
 enum commit_action {
 	commit_ignore,
-- 
2.8.2.524.g6ff3d78