git/unpack-trees.h
Victoria Dye 68fcd48baf unpack-trees: add 'skip_cache_tree_update' option
Add (disabled by default) option to skip the 'cache_tree_update()' at the
end of 'unpack_trees()'. In many cases, this cache tree update is redundant
because the caller of 'unpack_trees()' immediately follows it with
'prime_cache_tree()', rebuilding the entire cache tree from scratch. While
these operations aren't the most expensive part of operations like 'git
reset', the duplicate calls still create a minor unnecessary slowdown.

Introduce an option for callers to skip the 'cache_tree_update()' in
'unpack_trees()' if it is redundant (that is, if 'prime_cache_tree()' is
called afterwards). At the moment, no 'unpack_trees()' callers use the new
option; they will be updated in subsequent patches.

Signed-off-by: Victoria Dye <vdye@github.com>
Signed-off-by: Taylor Blau <me@ttaylorr.com>
2022-11-10 21:49:34 -05:00

131 lines
3.4 KiB
C

#ifndef UNPACK_TREES_H
#define UNPACK_TREES_H
#include "cache.h"
#include "strvec.h"
#include "string-list.h"
#include "tree-walk.h"
#define MAX_UNPACK_TREES MAX_TRAVERSE_TREES
struct cache_entry;
struct unpack_trees_options;
struct pattern_list;
typedef int (*merge_fn_t)(const struct cache_entry * const *src,
struct unpack_trees_options *options);
enum unpack_trees_error_types {
ERROR_WOULD_OVERWRITE = 0,
ERROR_NOT_UPTODATE_FILE,
ERROR_NOT_UPTODATE_DIR,
ERROR_CWD_IN_THE_WAY,
ERROR_WOULD_LOSE_UNTRACKED_OVERWRITTEN,
ERROR_WOULD_LOSE_UNTRACKED_REMOVED,
ERROR_BIND_OVERLAP,
ERROR_WOULD_LOSE_SUBMODULE,
NB_UNPACK_TREES_ERROR_TYPES,
WARNING_SPARSE_NOT_UPTODATE_FILE,
WARNING_SPARSE_UNMERGED_FILE,
WARNING_SPARSE_ORPHANED_NOT_OVERWRITTEN,
NB_UNPACK_TREES_WARNING_TYPES,
};
/*
* Sets the list of user-friendly error messages to be used by the
* command "cmd" (either merge or checkout), and show_all_errors to 1.
*/
void setup_unpack_trees_porcelain(struct unpack_trees_options *opts,
const char *cmd);
/*
* Frees resources allocated by setup_unpack_trees_porcelain().
*/
void clear_unpack_trees_porcelain(struct unpack_trees_options *opts);
enum unpack_trees_reset_type {
UNPACK_RESET_NONE = 0, /* traditional "false" value; still valid */
UNPACK_RESET_INVALID = 1, /* "true" no longer valid; use below values */
UNPACK_RESET_PROTECT_UNTRACKED,
UNPACK_RESET_OVERWRITE_UNTRACKED
};
struct unpack_trees_options {
unsigned int merge,
update,
preserve_ignored,
clone,
index_only,
nontrivial_merge,
trivial_merges_only,
verbose_update,
aggressive,
skip_unmerged,
initial_checkout,
diff_index_cached,
debug_unpack,
skip_sparse_checkout,
quiet,
exiting_early,
show_all_errors,
dry_run,
skip_cache_tree_update;
enum unpack_trees_reset_type reset;
const char *prefix;
int cache_bottom;
struct pathspec *pathspec;
merge_fn_t fn;
const char *msgs[NB_UNPACK_TREES_WARNING_TYPES];
struct strvec msgs_to_free;
/*
* Store error messages in an array, each case
* corresponding to a error message type
*/
struct string_list unpack_rejects[NB_UNPACK_TREES_WARNING_TYPES];
int head_idx;
int merge_size;
struct cache_entry *df_conflict_entry;
void *unpack_data;
struct index_state *dst_index;
struct index_state *src_index;
struct index_state result;
struct pattern_list *pl; /* for internal use */
struct dir_struct *dir; /* for internal use only */
struct checkout_metadata meta;
};
int unpack_trees(unsigned n, struct tree_desc *t,
struct unpack_trees_options *options);
enum update_sparsity_result {
UPDATE_SPARSITY_SUCCESS = 0,
UPDATE_SPARSITY_WARNINGS = 1,
UPDATE_SPARSITY_INDEX_UPDATE_FAILURES = -1,
UPDATE_SPARSITY_WORKTREE_UPDATE_FAILURES = -2
};
enum update_sparsity_result update_sparsity(struct unpack_trees_options *options);
int verify_uptodate(const struct cache_entry *ce,
struct unpack_trees_options *o);
int threeway_merge(const struct cache_entry * const *stages,
struct unpack_trees_options *o);
int twoway_merge(const struct cache_entry * const *src,
struct unpack_trees_options *o);
int bind_merge(const struct cache_entry * const *src,
struct unpack_trees_options *o);
int oneway_merge(const struct cache_entry * const *src,
struct unpack_trees_options *o);
int stash_worktree_untracked_merge(const struct cache_entry * const *src,
struct unpack_trees_options *o);
#endif