Re: What's cooking in git.git (Apr 2018, #03; Wed, 25)

> * bc/object-id (2018-04-24) 41 commits
>  - merge-one-file: compute empty blob object ID
>  - add--interactive: compute the empty tree value
>  - Update shell scripts to compute empty tree object ID
>  - sha1_file: only expose empty object constants through git_hash_algo
>  - dir: use the_hash_algo for empty blob object ID
>  - sequencer: use the_hash_algo for empty tree object ID
>  - cache-tree: use is_empty_tree_oid
>  - sha1_file: convert cached object code to struct object_id
>  - builtin/reset: convert use of EMPTY_TREE_SHA1_BIN
>  - builtin/receive-pack: convert one use of EMPTY_TREE_SHA1_HEX
>  - wt-status: convert two uses of EMPTY_TREE_SHA1_HEX
>  - submodule: convert several uses of EMPTY_TREE_SHA1_HEX
>  - sequencer: convert one use of EMPTY_TREE_SHA1_HEX
>  - merge: convert empty tree constant to the_hash_algo
>  - builtin/merge: switch tree functions to use object_id
>  - builtin/am: convert uses of EMPTY_TREE_SHA1_BIN to the_hash_algo
>  - builtin/receive-pack: avoid hard-coded constants for push certs
>  - diff: specify abbreviation size in terms of the_hash_algo
>  - upload-pack: replace use of several hard-coded constants
>  - revision: replace use of hard-coded constants
>  - http: eliminate hard-coded constants
>  - dir: convert struct untracked_cache_dir to object_id
>  - commit: convert uses of get_sha1_hex to get_oid_hex
>  - index-pack: abstract away hash function constant
>  - pack-redundant: convert linked lists to use struct object_id
>  - Update struct index_state to use struct object_id
>  - split-index: convert struct split_index to object_id
>  - submodule-config: convert structures to object_id
>  - fsck: convert static functions to struct object_id
>  - tree-walk: convert get_tree_entry_follow_symlinks to object_id
>  - tree-walk: avoid hard-coded 20 constant
>  - pack-redundant: abstract away hash algorithm
>  - pack-objects: abstract away hash algorithm
>  - packfile: abstract away hash constant values
>  - packfile: convert find_pack_entry to object_id
>  - sha1_file: convert freshen functions to object_id
>  - packfile: convert has_sha1_pack to object_id
>  - packfile: remove unused member from struct pack_entry
>  - Remove unused member in struct object_context
>  - server-info: remove unused members from struct pack_info
>  - cache: add a function to read an object ID from a buffer
> 
>  Conversion from uchar[20] to struct object_id continues.