promisor-remote: skip move_to_tail when no-op
[git/git.git] / packfile.h
1 #ifndef PACKFILE_H
2 #define PACKFILE_H
3
4 #include "cache.h"
5 #include "oidset.h"
6
7 /* in object-store.h */
8 struct packed_git;
9 struct object_info;
10
11 /*
12 * Generate the filename to be used for a pack file with checksum "sha1" and
13 * extension "ext". The result is written into the strbuf "buf", overwriting
14 * any existing contents. A pointer to buf->buf is returned as a convenience.
15 *
16 * Example: odb_pack_name(out, sha1, "idx") => ".git/objects/pack/pack-1234..idx"
17 */
18 char *odb_pack_name(struct strbuf *buf, const unsigned char *sha1, const char *ext);
19
20 /*
21 * Return the name of the (local) packfile with the specified sha1 in
22 * its name. The return value is a pointer to memory that is
23 * overwritten each time this function is called.
24 */
25 char *sha1_pack_name(const unsigned char *sha1);
26
27 /*
28 * Return the name of the (local) pack index file with the specified
29 * sha1 in its name. The return value is a pointer to memory that is
30 * overwritten each time this function is called.
31 */
32 char *sha1_pack_index_name(const unsigned char *sha1);
33
34 /*
35 * Return the basename of the packfile, omitting any containing directory
36 * (e.g., "pack-1234abcd[...].pack").
37 */
38 const char *pack_basename(struct packed_git *p);
39
40 struct packed_git *parse_pack_index(unsigned char *sha1, const char *idx_path);
41
42 typedef void each_file_in_pack_dir_fn(const char *full_path, size_t full_path_len,
43 const char *file_pach, void *data);
44 void for_each_file_in_pack_dir(const char *objdir,
45 each_file_in_pack_dir_fn fn,
46 void *data);
47
48 /* A hook to report invalid files in pack directory */
49 #define PACKDIR_FILE_PACK 1
50 #define PACKDIR_FILE_IDX 2
51 #define PACKDIR_FILE_GARBAGE 4
52 extern void (*report_garbage)(unsigned seen_bits, const char *path);
53
54 void reprepare_packed_git(struct repository *r);
55 void install_packed_git(struct repository *r, struct packed_git *pack);
56
57 struct packed_git *get_packed_git(struct repository *r);
58 struct list_head *get_packed_git_mru(struct repository *r);
59 struct multi_pack_index *get_multi_pack_index(struct repository *r);
60 struct packed_git *get_all_packs(struct repository *r);
61
62 /*
63 * Give a rough count of objects in the repository. This sacrifices accuracy
64 * for speed.
65 */
66 unsigned long repo_approximate_object_count(struct repository *r);
67 #define approximate_object_count() repo_approximate_object_count(the_repository)
68
69 struct packed_git *find_sha1_pack(const unsigned char *sha1,
70 struct packed_git *packs);
71
72 void pack_report(void);
73
74 /*
75 * mmap the index file for the specified packfile (if it is not
76 * already mmapped). Return 0 on success.
77 */
78 int open_pack_index(struct packed_git *);
79
80 /*
81 * munmap the index file for the specified packfile (if it is
82 * currently mmapped).
83 */
84 void close_pack_index(struct packed_git *);
85
86 int close_pack_fd(struct packed_git *p);
87
88 uint32_t get_pack_fanout(struct packed_git *p, uint32_t value);
89
90 unsigned char *use_pack(struct packed_git *, struct pack_window **, off_t, unsigned long *);
91 void close_pack_windows(struct packed_git *);
92 void close_pack(struct packed_git *);
93 void close_all_packs(struct raw_object_store *o);
94 void unuse_pack(struct pack_window **);
95 void clear_delta_base_cache(void);
96 struct packed_git *add_packed_git(const char *path, size_t path_len, int local);
97
98 /*
99 * Make sure that a pointer access into an mmap'd index file is within bounds,
100 * and can provide at least 8 bytes of data.
101 *
102 * Note that this is only necessary for variable-length segments of the file
103 * (like the 64-bit extended offset table), as we compare the size to the
104 * fixed-length parts when we open the file.
105 */
106 void check_pack_index_ptr(const struct packed_git *p, const void *ptr);
107
108 /*
109 * Perform binary search on a pack-index for a given oid. Packfile is expected to
110 * have a valid pack-index.
111 *
112 * See 'bsearch_hash' for more information.
113 */
114 int bsearch_pack(const struct object_id *oid, const struct packed_git *p, uint32_t *result);
115
116 /*
117 * Return the SHA-1 of the nth object within the specified packfile.
118 * Open the index if it is not already open. The return value points
119 * at the SHA-1 within the mmapped index. Return NULL if there is an
120 * error.
121 */
122 const unsigned char *nth_packed_object_sha1(struct packed_git *, uint32_t n);
123 /*
124 * Like nth_packed_object_sha1, but write the data into the object specified by
125 * the the first argument. Returns the first argument on success, and NULL on
126 * error.
127 */
128 const struct object_id *nth_packed_object_oid(struct object_id *, struct packed_git *, uint32_t n);
129
130 /*
131 * Return the offset of the nth object within the specified packfile.
132 * The index must already be opened.
133 */
134 off_t nth_packed_object_offset(const struct packed_git *, uint32_t n);
135
136 /*
137 * If the object named sha1 is present in the specified packfile,
138 * return its offset within the packfile; otherwise, return 0.
139 */
140 off_t find_pack_entry_one(const unsigned char *sha1, struct packed_git *);
141
142 int is_pack_valid(struct packed_git *);
143 void *unpack_entry(struct repository *r, struct packed_git *, off_t, enum object_type *, unsigned long *);
144 unsigned long unpack_object_header_buffer(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep);
145 unsigned long get_size_from_delta(struct packed_git *, struct pack_window **, off_t);
146 int unpack_object_header(struct packed_git *, struct pack_window **, off_t *, unsigned long *);
147
148 void release_pack_memory(size_t);
149
150 /* global flag to enable extra checks when accessing packed objects */
151 extern int do_check_packed_object_crc;
152
153 int packed_object_info(struct repository *r,
154 struct packed_git *pack,
155 off_t offset, struct object_info *);
156
157 void mark_bad_packed_object(struct packed_git *p, const unsigned char *sha1);
158 const struct packed_git *has_packed_and_bad(struct repository *r, const unsigned char *sha1);
159
160 /*
161 * Iff a pack file in the given repository contains the object named by sha1,
162 * return true and store its location to e.
163 */
164 int find_pack_entry(struct repository *r, const struct object_id *oid, struct pack_entry *e);
165
166 int has_object_pack(const struct object_id *oid);
167
168 int has_pack_index(const unsigned char *sha1);
169
170 /*
171 * Return 1 if an object in a promisor packfile is or refers to the given
172 * object, 0 otherwise.
173 */
174 int is_promisor_object(const struct object_id *oid);
175
176 /*
177 * Expose a function for fuzz testing.
178 *
179 * load_idx() parses a block of memory as a packfile index and puts the results
180 * into a struct packed_git.
181 *
182 * This function should not be used directly. It is exposed here only so that we
183 * have a convenient entry-point for fuzz testing. For real uses, you should
184 * probably use open_pack_index() or parse_pack_index() instead.
185 */
186 int load_idx(const char *path, const unsigned int hashsz, void *idx_map,
187 size_t idx_size, struct packed_git *p);
188
189 #endif