[PATCH v2 08/16] midx: expose `midx_layer_contains_pack()`

[Taylor Blau <me@ttaylorr.com>]

Rename the function `midx_contains_pack_1()` to instead be called
`midx_layer_contains_pack()` and make it accessible. Unlike
`midx_contains_pack()` (which recurses through the entire chain), this
function checks only a single MIDX layer.

This will be used by a subsequent commit to determine whether a given
pack belongs to the tip MIDX layer specifically, rather than to any
layer in the chain.

No functional changes are present in this commit.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
---
 midx.c | 6 +++---
 midx.h | 2 ++
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/midx.c b/midx.c
index bcb8c999015..dc86c8e7fee 100644
--- a/midx.c
+++ b/midx.c
@@ -667,8 +667,8 @@ static int midx_pack_names_cmp(const void *a, const void *b, void *m_)
 		      m->pack_names[*(const size_t *)b]);
 }
 
-static int midx_contains_pack_1(struct multi_pack_index *m,
-				const char *idx_or_pack_name)
+int midx_layer_contains_pack(struct multi_pack_index *m,
+			     const char *idx_or_pack_name)
 {
 	uint32_t first = 0, last = m->num_packs;
 
@@ -709,7 +709,7 @@ static int midx_contains_pack_1(struct multi_pack_index *m,
 int midx_contains_pack(struct multi_pack_index *m, const char *idx_or_pack_name)
 {
 	for (; m; m = m->base_midx)
-		if (midx_contains_pack_1(m, idx_or_pack_name))
+		if (midx_layer_contains_pack(m, idx_or_pack_name))
 			return 1;
 	return 0;
 }
diff --git a/midx.h b/midx.h
index 77dd66de02b..3ee12dd08ec 100644
--- a/midx.h
+++ b/midx.h
@@ -119,6 +119,8 @@ struct object_id *nth_midxed_object_oid(struct object_id *oid,
 int fill_midx_entry(struct multi_pack_index *m, const struct object_id *oid, struct pack_entry *e);
 int midx_contains_pack(struct multi_pack_index *m,
 		       const char *idx_or_pack_name);
+int midx_layer_contains_pack(struct multi_pack_index *m,
+			     const char *idx_or_pack_name);
 int midx_preferred_pack(struct multi_pack_index *m, uint32_t *pack_int_id);
 int prepare_multi_pack_index_one(struct odb_source *source);
 
-- 
2.54.0.9.gb905fd5d0ae