commit-graph: write Bloom filters to commit graph file
[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 #include "object-store.h"
9
10 #define GIT_TEST_COMMIT_GRAPH "GIT_TEST_COMMIT_GRAPH"
11 #define GIT_TEST_COMMIT_GRAPH_DIE_ON_LOAD "GIT_TEST_COMMIT_GRAPH_DIE_ON_LOAD"
12
13 struct commit;
14 struct bloom_filter_settings;
15
16 char *get_commit_graph_filename(struct object_directory *odb);
17 int open_commit_graph(const char *graph_file, int *fd, struct stat *st);
18
19 /*
20  * Given a commit struct, try to fill the commit struct info, including:
21  *  1. tree object
22  *  2. date
23  *  3. parents.
24  *
25  * Returns 1 if and only if the commit was found in the packed graph.
26  *
27  * See parse_commit_buffer() for the fallback after this call.
28  */
29 int parse_commit_in_graph(struct repository *r, struct commit *item);
30
31 /*
32  * It is possible that we loaded commit contents from the commit buffer,
33  * but we also want to ensure the commit-graph content is correctly
34  * checked and filled. Fill the graph_pos and generation members of
35  * the given commit.
36  */
37 void load_commit_graph_info(struct repository *r, struct commit *item);
38
39 struct tree *get_commit_tree_in_graph(struct repository *r,
40                                       const struct commit *c);
41
42 struct commit_graph {
43         int graph_fd;
44
45         const unsigned char *data;
46         size_t data_len;
47
48         unsigned char hash_len;
49         unsigned char num_chunks;
50         uint32_t num_commits;
51         struct object_id oid;
52         char *filename;
53         struct object_directory *odb;
54
55         uint32_t num_commits_in_base;
56         struct commit_graph *base_graph;
57
58         const uint32_t *chunk_oid_fanout;
59         const unsigned char *chunk_oid_lookup;
60         const unsigned char *chunk_commit_data;
61         const unsigned char *chunk_extra_edges;
62         const unsigned char *chunk_base_graphs;
63         const unsigned char *chunk_bloom_indexes;
64         const unsigned char *chunk_bloom_data;
65
66         struct bloom_filter_settings *bloom_filter_settings;
67 };
68
69 struct commit_graph *load_commit_graph_one_fd_st(int fd, struct stat *st,
70                                                  struct object_directory *odb);
71 struct commit_graph *read_commit_graph_one(struct repository *r,
72                                            struct object_directory *odb);
73 struct commit_graph *parse_commit_graph(void *graph_map, int fd,
74                                         size_t graph_size);
75
76 /*
77  * Return 1 if and only if the repository has a commit-graph
78  * file and generation numbers are computed in that file.
79  */
80 int generation_numbers_enabled(struct repository *r);
81
82 enum commit_graph_write_flags {
83         COMMIT_GRAPH_WRITE_APPEND     = (1 << 0),
84         COMMIT_GRAPH_WRITE_PROGRESS   = (1 << 1),
85         COMMIT_GRAPH_WRITE_SPLIT      = (1 << 2),
86         /* Make sure that each OID in the input is a valid commit OID. */
87         COMMIT_GRAPH_WRITE_CHECK_OIDS = (1 << 3),
88         COMMIT_GRAPH_WRITE_BLOOM_FILTERS = (1 << 4),
89 };
90
91 struct split_commit_graph_opts {
92         int size_multiple;
93         int max_commits;
94         timestamp_t expire_time;
95 };
96
97 /*
98  * The write_commit_graph* methods return zero on success
99  * and a negative value on failure. Note that if the repository
100  * is not compatible with the commit-graph feature, then the
101  * methods will return 0 without writing a commit-graph.
102  */
103 int write_commit_graph_reachable(struct object_directory *odb,
104                                  enum commit_graph_write_flags flags,
105                                  const struct split_commit_graph_opts *split_opts);
106 int write_commit_graph(struct object_directory *odb,
107                        struct string_list *pack_indexes,
108                        struct string_list *commit_hex,
109                        enum commit_graph_write_flags flags,
110                        const struct split_commit_graph_opts *split_opts);
111
112 #define COMMIT_GRAPH_VERIFY_SHALLOW     (1 << 0)
113
114 int verify_commit_graph(struct repository *r, struct commit_graph *g, int flags);
115
116 void close_commit_graph(struct raw_object_store *);
117 void free_commit_graph(struct commit_graph *);
118
119 /*
120  * Disable further use of the commit graph in this process when parsing a
121  * "struct commit".
122  */
123 void disable_commit_graph(struct repository *r);
124
125 #endif