git/commit-graph.h
Elijah Newren f332121e75 treewide: remove unnecessary git-compat-util.h includes in headers
For sanity, we should probably do one of the following:

(a) make C and header files both depend upon everything they need
(b) consistently exclude git-compat-util.h from headers and require it
    be the first include in C files

Currently, we have some of the headers following (a) and others
following (b), which makes things messy.  In the past I was pushed
towards (b), as per [1] and [2].  Further, during this series I
discovered that this mixture empirically will mean that we end up with C
files that do not directly include git-compat-util.h, and do include
headers that don't include git-compat-util.h, with the result that we
likely have headers included before an indirect inclusion of
git-compat-util.h.  Since git-compat-util.h has tricky platform-specific
stuff that is meant to be included before everything else, this state of
affairs is risky and may lead to things breaking in subtle ways (and
only on some platforms) as per [1] and [2].

Since including git-compat-util.h in existing header files makes it
harder for us to catch C files that are missing that include, let's
switch to (b) to make the enforcement of this rule easier.  Remove the
inclusion of git-compat-util.h from header files other than the ones
that have been approved as alternate first includes.

[1] https://lore.kernel.org/git/20180811173406.GA9119@sigill.intra.peff.net/
[2] https://lore.kernel.org/git/20180811174301.GA9287@sigill.intra.peff.net/

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-02-23 17:25:28 -08:00

193 lines
6.1 KiB
C

#ifndef COMMIT_GRAPH_H
#define COMMIT_GRAPH_H
#include "object-store.h"
#include "oidset.h"
#define GIT_TEST_COMMIT_GRAPH "GIT_TEST_COMMIT_GRAPH"
#define GIT_TEST_COMMIT_GRAPH_DIE_ON_PARSE "GIT_TEST_COMMIT_GRAPH_DIE_ON_PARSE"
#define GIT_TEST_COMMIT_GRAPH_CHANGED_PATHS "GIT_TEST_COMMIT_GRAPH_CHANGED_PATHS"
/*
* This method is only used to enhance coverage of the commit-graph
* feature in the test suite with the GIT_TEST_COMMIT_GRAPH and
* GIT_TEST_COMMIT_GRAPH_CHANGED_PATHS environment variables. Do not
* call this method oustide of a builtin, and only if you know what
* you are doing!
*/
void git_test_write_commit_graph_or_die(void);
struct commit;
struct bloom_filter_settings;
struct repository;
struct raw_object_store;
struct string_list;
char *get_commit_graph_filename(struct object_directory *odb);
char *get_commit_graph_chain_filename(struct object_directory *odb);
int open_commit_graph(const char *graph_file, int *fd, struct stat *st);
/*
* Given a commit struct, try to fill the commit struct info, including:
* 1. tree object
* 2. date
* 3. parents.
*
* Returns 1 if and only if the commit was found in the packed graph.
*
* See parse_commit_buffer() for the fallback after this call.
*/
int parse_commit_in_graph(struct repository *r, struct commit *item);
/*
* Fills `*pos` with the graph position of `c`, and returns 1 if `c` is
* found in the commit-graph belonging to `r`, or 0 otherwise.
* Initializes the commit-graph belonging to `r` if it hasn't been
* already.
*
* Note: this is a low-level helper that does not alter any slab data
* associated with `c`. Useful in circumstances where the slab data is
* already being modified (e.g., writing the commit-graph itself).
*
* In most cases, callers should use `parse_commit_in_graph()` instead.
*/
int repo_find_commit_pos_in_graph(struct repository *r, struct commit *c,
uint32_t *pos);
/*
* Look up the given commit ID in the commit-graph. This will only return a
* commit if the ID exists both in the graph and in the object database such
* that we don't return commits whose object has been pruned. Otherwise, this
* function returns `NULL`.
*/
struct commit *lookup_commit_in_graph(struct repository *repo, const struct object_id *id);
/*
* It is possible that we loaded commit contents from the commit buffer,
* but we also want to ensure the commit-graph content is correctly
* checked and filled. Fill the graph_pos and generation members of
* the given commit.
*/
void load_commit_graph_info(struct repository *r, struct commit *item);
struct tree *get_commit_tree_in_graph(struct repository *r,
const struct commit *c);
struct commit_graph {
const unsigned char *data;
size_t data_len;
unsigned char hash_len;
unsigned char num_chunks;
uint32_t num_commits;
struct object_id oid;
char *filename;
struct object_directory *odb;
uint32_t num_commits_in_base;
unsigned int read_generation_data;
struct commit_graph *base_graph;
const uint32_t *chunk_oid_fanout;
const unsigned char *chunk_oid_lookup;
const unsigned char *chunk_commit_data;
const unsigned char *chunk_generation_data;
const unsigned char *chunk_generation_data_overflow;
const unsigned char *chunk_extra_edges;
const unsigned char *chunk_base_graphs;
const unsigned char *chunk_bloom_indexes;
const unsigned char *chunk_bloom_data;
struct topo_level_slab *topo_levels;
struct bloom_filter_settings *bloom_filter_settings;
};
struct commit_graph *load_commit_graph_one_fd_st(struct repository *r,
int fd, struct stat *st,
struct object_directory *odb);
struct commit_graph *read_commit_graph_one(struct repository *r,
struct object_directory *odb);
/*
* Callers should initialize the repo_settings with prepare_repo_settings()
* prior to calling parse_commit_graph().
*/
struct commit_graph *parse_commit_graph(struct repo_settings *s,
void *graph_map, size_t graph_size);
/*
* Return 1 if and only if the repository has a commit-graph
* file and generation numbers are computed in that file.
*/
int generation_numbers_enabled(struct repository *r);
/*
* Return 1 if and only if the repository has a commit-graph
* file and generation data chunk has been written for the file.
*/
int corrected_commit_dates_enabled(struct repository *r);
struct bloom_filter_settings *get_bloom_filter_settings(struct repository *r);
enum commit_graph_write_flags {
COMMIT_GRAPH_WRITE_APPEND = (1 << 0),
COMMIT_GRAPH_WRITE_PROGRESS = (1 << 1),
COMMIT_GRAPH_WRITE_SPLIT = (1 << 2),
COMMIT_GRAPH_WRITE_BLOOM_FILTERS = (1 << 3),
COMMIT_GRAPH_NO_WRITE_BLOOM_FILTERS = (1 << 4),
};
enum commit_graph_split_flags {
COMMIT_GRAPH_SPLIT_UNSPECIFIED = 0,
COMMIT_GRAPH_SPLIT_MERGE_PROHIBITED = 1,
COMMIT_GRAPH_SPLIT_REPLACE = 2
};
struct commit_graph_opts {
int size_multiple;
int max_commits;
timestamp_t expire_time;
enum commit_graph_split_flags split_flags;
int max_new_filters;
};
/*
* The write_commit_graph* methods return zero on success
* and a negative value on failure. Note that if the repository
* is not compatible with the commit-graph feature, then the
* methods will return 0 without writing a commit-graph.
*/
int write_commit_graph_reachable(struct object_directory *odb,
enum commit_graph_write_flags flags,
const struct commit_graph_opts *opts);
int write_commit_graph(struct object_directory *odb,
const struct string_list *pack_indexes,
struct oidset *commits,
enum commit_graph_write_flags flags,
const struct commit_graph_opts *opts);
#define COMMIT_GRAPH_VERIFY_SHALLOW (1 << 0)
int verify_commit_graph(struct repository *r, struct commit_graph *g, int flags);
void close_commit_graph(struct raw_object_store *);
void free_commit_graph(struct commit_graph *);
/*
* Disable further use of the commit graph in this process when parsing a
* "struct commit".
*/
void disable_commit_graph(struct repository *r);
struct commit_graph_data {
uint32_t graph_pos;
timestamp_t generation;
};
/*
* Commits should be parsed before accessing generation, graph positions.
*/
timestamp_t commit_graph_generation(const struct commit *);
uint32_t commit_graph_position(const struct commit *);
#endif