git: use COPY_ARRAY and MOVE_ARRAY in handle_alias()
[git/git.git] / commit-graph.h
1 #ifndef COMMIT_GRAPH_H
2 #define COMMIT_GRAPH_H
3
4 #include "git-compat-util.h"
5 #include "repository.h"
6 #include "string-list.h"
7 #include "cache.h"
8
9 #define GIT_TEST_COMMIT_GRAPH "GIT_TEST_COMMIT_GRAPH"
10 #define GIT_TEST_COMMIT_GRAPH_DIE_ON_LOAD "GIT_TEST_COMMIT_GRAPH_DIE_ON_LOAD"
11
12 struct commit;
13
14 char *get_commit_graph_filename(const char *obj_dir);
15 int open_commit_graph(const char *graph_file, int *fd, struct stat *st);
16
17 /*
18 * Given a commit struct, try to fill the commit struct info, including:
19 * 1. tree object
20 * 2. date
21 * 3. parents.
22 *
23 * Returns 1 if and only if the commit was found in the packed graph.
24 *
25 * See parse_commit_buffer() for the fallback after this call.
26 */
27 int parse_commit_in_graph(struct repository *r, struct commit *item);
28
29 /*
30 * It is possible that we loaded commit contents from the commit buffer,
31 * but we also want to ensure the commit-graph content is correctly
32 * checked and filled. Fill the graph_pos and generation members of
33 * the given commit.
34 */
35 void load_commit_graph_info(struct repository *r, struct commit *item);
36
37 struct tree *get_commit_tree_in_graph(struct repository *r,
38 const struct commit *c);
39
40 struct commit_graph {
41 int graph_fd;
42
43 const unsigned char *data;
44 size_t data_len;
45
46 unsigned char hash_len;
47 unsigned char num_chunks;
48 uint32_t num_commits;
49 struct object_id oid;
50 char *filename;
51 const char *obj_dir;
52
53 uint32_t num_commits_in_base;
54 struct commit_graph *base_graph;
55
56 const uint32_t *chunk_oid_fanout;
57 const unsigned char *chunk_oid_lookup;
58 const unsigned char *chunk_commit_data;
59 const unsigned char *chunk_extra_edges;
60 const unsigned char *chunk_base_graphs;
61 };
62
63 struct commit_graph *load_commit_graph_one_fd_st(int fd, struct stat *st);
64 struct commit_graph *read_commit_graph_one(struct repository *r, const char *obj_dir);
65 struct commit_graph *parse_commit_graph(void *graph_map, int fd,
66 size_t graph_size);
67
68 /*
69 * Return 1 if and only if the repository has a commit-graph
70 * file and generation numbers are computed in that file.
71 */
72 int generation_numbers_enabled(struct repository *r);
73
74 #define COMMIT_GRAPH_APPEND (1 << 0)
75 #define COMMIT_GRAPH_PROGRESS (1 << 1)
76 #define COMMIT_GRAPH_SPLIT (1 << 2)
77
78 struct split_commit_graph_opts {
79 int size_multiple;
80 int max_commits;
81 timestamp_t expire_time;
82 };
83
84 /*
85 * The write_commit_graph* methods return zero on success
86 * and a negative value on failure. Note that if the repository
87 * is not compatible with the commit-graph feature, then the
88 * methods will return 0 without writing a commit-graph.
89 */
90 int write_commit_graph_reachable(const char *obj_dir, unsigned int flags,
91 const struct split_commit_graph_opts *split_opts);
92 int write_commit_graph(const char *obj_dir,
93 struct string_list *pack_indexes,
94 struct string_list *commit_hex,
95 unsigned int flags,
96 const struct split_commit_graph_opts *split_opts);
97
98 #define COMMIT_GRAPH_VERIFY_SHALLOW (1 << 0)
99
100 int verify_commit_graph(struct repository *r, struct commit_graph *g, int flags);
101
102 void close_commit_graph(struct raw_object_store *);
103 void free_commit_graph(struct commit_graph *);
104
105 #endif