commit-graph: persist existence of changed-paths
[git] / commit-graph.h
1 #ifndef COMMIT_GRAPH_H
2 #define COMMIT_GRAPH_H
3
4 #include "git-compat-util.h"
5 #include "object-store.h"
6
7 #define GIT_TEST_COMMIT_GRAPH "GIT_TEST_COMMIT_GRAPH"
8 #define GIT_TEST_COMMIT_GRAPH_DIE_ON_PARSE "GIT_TEST_COMMIT_GRAPH_DIE_ON_PARSE"
9 #define GIT_TEST_COMMIT_GRAPH_CHANGED_PATHS "GIT_TEST_COMMIT_GRAPH_CHANGED_PATHS"
10
11 /*
12  * This method is only used to enhance coverage of the commit-graph
13  * feature in the test suite with the GIT_TEST_COMMIT_GRAPH and
14  * GIT_TEST_COMMIT_GRAPH_CHANGED_PATHS environment variables. Do not
15  * call this method oustide of a builtin, and only if you know what
16  * you are doing!
17  */
18 void git_test_write_commit_graph_or_die(void);
19
20 struct commit;
21 struct bloom_filter_settings;
22 struct repository;
23 struct raw_object_store;
24 struct string_list;
25
26 char *get_commit_graph_filename(struct object_directory *odb);
27 int open_commit_graph(const char *graph_file, int *fd, struct stat *st);
28
29 /*
30  * Given a commit struct, try to fill the commit struct info, including:
31  *  1. tree object
32  *  2. date
33  *  3. parents.
34  *
35  * Returns 1 if and only if the commit was found in the packed graph.
36  *
37  * See parse_commit_buffer() for the fallback after this call.
38  */
39 int parse_commit_in_graph(struct repository *r, struct commit *item);
40
41 /*
42  * It is possible that we loaded commit contents from the commit buffer,
43  * but we also want to ensure the commit-graph content is correctly
44  * checked and filled. Fill the graph_pos and generation members of
45  * the given commit.
46  */
47 void load_commit_graph_info(struct repository *r, struct commit *item);
48
49 struct tree *get_commit_tree_in_graph(struct repository *r,
50                                       const struct commit *c);
51
52 struct commit_graph {
53         int graph_fd;
54
55         const unsigned char *data;
56         size_t data_len;
57
58         unsigned char hash_len;
59         unsigned char num_chunks;
60         uint32_t num_commits;
61         struct object_id oid;
62         char *filename;
63         struct object_directory *odb;
64
65         uint32_t num_commits_in_base;
66         struct commit_graph *base_graph;
67
68         const uint32_t *chunk_oid_fanout;
69         const unsigned char *chunk_oid_lookup;
70         const unsigned char *chunk_commit_data;
71         const unsigned char *chunk_extra_edges;
72         const unsigned char *chunk_base_graphs;
73         const unsigned char *chunk_bloom_indexes;
74         const unsigned char *chunk_bloom_data;
75
76         struct bloom_filter_settings *bloom_filter_settings;
77 };
78
79 struct commit_graph *load_commit_graph_one_fd_st(int fd, struct stat *st,
80                                                  struct object_directory *odb);
81 struct commit_graph *read_commit_graph_one(struct repository *r,
82                                            struct object_directory *odb);
83 struct commit_graph *parse_commit_graph(void *graph_map, int fd,
84                                         size_t graph_size);
85
86 /*
87  * Return 1 if and only if the repository has a commit-graph
88  * file and generation numbers are computed in that file.
89  */
90 int generation_numbers_enabled(struct repository *r);
91
92 enum commit_graph_write_flags {
93         COMMIT_GRAPH_WRITE_APPEND     = (1 << 0),
94         COMMIT_GRAPH_WRITE_PROGRESS   = (1 << 1),
95         COMMIT_GRAPH_WRITE_SPLIT      = (1 << 2),
96         /* Make sure that each OID in the input is a valid commit OID. */
97         COMMIT_GRAPH_WRITE_CHECK_OIDS = (1 << 3),
98         COMMIT_GRAPH_WRITE_BLOOM_FILTERS = (1 << 4),
99         COMMIT_GRAPH_NO_WRITE_BLOOM_FILTERS = (1 << 5),
100 };
101
102 struct split_commit_graph_opts {
103         int size_multiple;
104         int max_commits;
105         timestamp_t expire_time;
106 };
107
108 /*
109  * The write_commit_graph* methods return zero on success
110  * and a negative value on failure. Note that if the repository
111  * is not compatible with the commit-graph feature, then the
112  * methods will return 0 without writing a commit-graph.
113  */
114 int write_commit_graph_reachable(struct object_directory *odb,
115                                  enum commit_graph_write_flags flags,
116                                  const struct split_commit_graph_opts *split_opts);
117 int write_commit_graph(struct object_directory *odb,
118                        struct string_list *pack_indexes,
119                        struct string_list *commit_hex,
120                        enum commit_graph_write_flags flags,
121                        const struct split_commit_graph_opts *split_opts);
122
123 #define COMMIT_GRAPH_VERIFY_SHALLOW     (1 << 0)
124
125 int verify_commit_graph(struct repository *r, struct commit_graph *g, int flags);
126
127 void close_commit_graph(struct raw_object_store *);
128 void free_commit_graph(struct commit_graph *);
129
130 /*
131  * Disable further use of the commit graph in this process when parsing a
132  * "struct commit".
133  */
134 void disable_commit_graph(struct repository *r);
135
136 #endif