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Edit and expand the sparse-index design document with the plan for
guarding index operations with ensure_full_index().
Notably, the plan has changed to not have an expand_to_path() method in
favor of checking for a sparse-directory hit inside of the
index_path_pos() API.
The changes that follow this one will incrementally add
ensure_full_index() guards to iterations over all cache entries. Some
iterations over the cache entries are not protected due to a few
categories listed in the document. Since these are not being modified,
here is a short list of the files and methods that will not receive
these guards:
Looking for non-zero stage:
* builtin/add.c:chmod_pathspec()
* builtin/merge.c:count_unmerged_entries()
* merge-ort.c:record_conflicted_index_entries()
* read-cache.c:unmerged_index()
* rerere.c:check_one_conflict(), find_conflict(), rerere_remaining()
* revision.c:prepare_show_merge()
* sequencer.c:append_conflicts_hint()
* wt-status.c:wt_status_collect_changes_initial()
Looking for submodules:
* builtin/submodule--helper.c:module_list_compute()
* submodule.c: several methods
* worktree.c:validate_no_submodules()
Part of the index API:
* name-hash.c: lazy init methods
* preload-index.c:preload_thread(), preload_index()
* read-cache.c: file format methods
Checking for correct order of cache entries:
* read-cache.c:check_ce_order()
Ignores SKIP_WORKTREE entries or already aware:
* unpack-trees.c:mark_new_skip_worktree()
* wt-status.c:wt_status_check_sparse_checkout()
Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Reviewed-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Derrick Stolee