indexer: use a byte array for checksum

The index's checksum is not an object ID, so we should not use the
`git_oid` type.  Use a byte array for checksum calculation and storage.

Deprecate the `git_indexer_hash` function.  Callers should use the new
`git_indexer_name` function which provides a unique packfile name.

1 files changed, 14 insertions, 0 deletions

diff --git a/include/git2/indexer.h b/include/git2/indexer.h
index 4bacbd317..ffe9bf366 100644
--- a/include/git2/indexer.h
+++ b/include/git2/indexer.h
@@ -129,16 +129,30 @@ GIT_EXTERN(int) git_indexer_append(git_indexer *idx, const void *data, size_t si
  */
 GIT_EXTERN(int) git_indexer_commit(git_indexer *idx, git_indexer_progress *stats);
 
+#ifndef GIT_DEPRECATE_HARD
 /**
  * Get the packfile's hash
  *
  * A packfile's name is derived from the sorted hashing of all object
  * names. This is only correct after the index has been finalized.
  *
+ * @deprecated use git_indexer_name
  * @param idx the indexer instance
  * @return the packfile's hash
  */
 GIT_EXTERN(const git_oid *) git_indexer_hash(const git_indexer *idx);
+#endif
+
+/**
+ * Get the unique name for the resulting packfile.
+ *
+ * The packfile's name is derived from the packfile's content.
+ * This is only correct after the index has been finalized.
+ *
+ * @param idx the indexer instance
+ * @return a NUL terminated string for the packfile name
+ */
+GIT_EXTERN(const char *) git_indexer_name(const git_indexer *idx);
 
 /**
  * Free the indexer and its resources