Merge branch 'mh/tidy-ref-update-flags'

Code clean-up in refs API implementation.

* mh/tidy-ref-update-flags:
  refs: update some more docs to use "oid" rather than "sha1"
  write_packed_entry(): take `object_id` arguments
  refs: rename constant `REF_ISPRUNING` to `REF_IS_PRUNING`
  refs: rename constant `REF_NODEREF` to `REF_NO_DEREF`
  refs: tidy up and adjust visibility of the `ref_update` flags
  ref_transaction_add_update(): remove a check
  ref_transaction_update(): die on disallowed flags
  prune_ref(): call `ref_transaction_add_update()` directly
  files_transaction_prepare(): don't leak flags to packed transaction

diff --cc bisect.c
index de551c6,c09f7bb..0fca17c
--- 1/bisect.c
--- 2/bisect.c
+++ b/bisect.c
@@@ -1055,40 -1045,3 +1055,40 @@@ int estimate_bisect_steps(int all
  
        return (e < 3 * x) ? n : n - 1;
  }
-       result = delete_refs("bisect: remove", &refs_for_removal, REF_NODEREF);
 +
 +static int mark_for_removal(const char *refname, const struct object_id *oid,
 +                          int flag, void *cb_data)
 +{
 +      struct string_list *refs = cb_data;
 +      char *ref = xstrfmt("refs/bisect%s", refname);
 +      string_list_append(refs, ref);
 +      return 0;
 +}
 +
 +int bisect_clean_state(void)
 +{
 +      int result = 0;
 +
 +      /* There may be some refs packed during bisection */
 +      struct string_list refs_for_removal = STRING_LIST_INIT_NODUP;
 +      for_each_ref_in("refs/bisect", mark_for_removal, (void *) &refs_for_removal);
 +      string_list_append(&refs_for_removal, xstrdup("BISECT_HEAD"));
++      result = delete_refs("bisect: remove", &refs_for_removal, REF_NO_DEREF);
 +      refs_for_removal.strdup_strings = 1;
 +      string_list_clear(&refs_for_removal, 0);
 +      unlink_or_warn(git_path_bisect_expected_rev());
 +      unlink_or_warn(git_path_bisect_ancestors_ok());
 +      unlink_or_warn(git_path_bisect_log());
 +      unlink_or_warn(git_path_bisect_names());
 +      unlink_or_warn(git_path_bisect_run());
 +      unlink_or_warn(git_path_bisect_terms());
 +      /* Cleanup head-name if it got left by an old version of git-bisect */
 +      unlink_or_warn(git_path_head_name());
 +      /*
 +       * Cleanup BISECT_START last to support the --no-checkout option
 +       * introduced in the commit 4796e823a.
 +       */
 +      unlink_or_warn(git_path_bisect_start());
 +
 +      return result;
 +}

diff --cc builtin/am.c
Simple merge

diff --cc builtin/checkout.c
Simple merge

diff --cc builtin/clone.c
Simple merge

diff --cc builtin/remote.c
Simple merge

diff --cc refs/files-backend.c
Simple merge

diff --cc refs/packed-backend.c
Simple merge

diff --cc sequencer.c
Simple merge