packfile: add all_packs list
[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 extern 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 extern 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 extern char *sha1_pack_index_name(const unsigned char *sha1);
33
34 extern struct packed_git *parse_pack_index(unsigned char *sha1, const char *idx_path);
35
36 typedef void each_file_in_pack_dir_fn(const char *full_path, size_t full_path_len,
37 const char *file_pach, void *data);
38 void for_each_file_in_pack_dir(const char *objdir,
39 each_file_in_pack_dir_fn fn,
40 void *data);
41
42 /* A hook to report invalid files in pack directory */
43 #define PACKDIR_FILE_PACK 1
44 #define PACKDIR_FILE_IDX 2
45 #define PACKDIR_FILE_GARBAGE 4
46 extern void (*report_garbage)(unsigned seen_bits, const char *path);
47
48 extern void reprepare_packed_git(struct repository *r);
49 extern void install_packed_git(struct repository *r, struct packed_git *pack);
50
51 struct packed_git *get_packed_git(struct repository *r);
52 struct list_head *get_packed_git_mru(struct repository *r);
53 struct multi_pack_index *get_multi_pack_index(struct repository *r);
54 struct packed_git *get_all_packs(struct repository *r);
55
56 /*
57 * Give a rough count of objects in the repository. This sacrifices accuracy
58 * for speed.
59 */
60 unsigned long approximate_object_count(void);
61
62 extern struct packed_git *find_sha1_pack(const unsigned char *sha1,
63 struct packed_git *packs);
64
65 extern void pack_report(void);
66
67 /*
68 * mmap the index file for the specified packfile (if it is not
69 * already mmapped). Return 0 on success.
70 */
71 extern int open_pack_index(struct packed_git *);
72
73 /*
74 * munmap the index file for the specified packfile (if it is
75 * currently mmapped).
76 */
77 extern void close_pack_index(struct packed_git *);
78
79 extern uint32_t get_pack_fanout(struct packed_git *p, uint32_t value);
80
81 extern unsigned char *use_pack(struct packed_git *, struct pack_window **, off_t, unsigned long *);
82 extern void close_pack_windows(struct packed_git *);
83 extern void close_pack(struct packed_git *);
84 extern void close_all_packs(struct raw_object_store *o);
85 extern void unuse_pack(struct pack_window **);
86 extern void clear_delta_base_cache(void);
87 extern struct packed_git *add_packed_git(const char *path, size_t path_len, int local);
88
89 /*
90 * Make sure that a pointer access into an mmap'd index file is within bounds,
91 * and can provide at least 8 bytes of data.
92 *
93 * Note that this is only necessary for variable-length segments of the file
94 * (like the 64-bit extended offset table), as we compare the size to the
95 * fixed-length parts when we open the file.
96 */
97 extern void check_pack_index_ptr(const struct packed_git *p, const void *ptr);
98
99 /*
100 * Perform binary search on a pack-index for a given oid. Packfile is expected to
101 * have a valid pack-index.
102 *
103 * See 'bsearch_hash' for more information.
104 */
105 int bsearch_pack(const struct object_id *oid, const struct packed_git *p, uint32_t *result);
106
107 /*
108 * Return the SHA-1 of the nth object within the specified packfile.
109 * Open the index if it is not already open. The return value points
110 * at the SHA-1 within the mmapped index. Return NULL if there is an
111 * error.
112 */
113 extern const unsigned char *nth_packed_object_sha1(struct packed_git *, uint32_t n);
114 /*
115 * Like nth_packed_object_sha1, but write the data into the object specified by
116 * the the first argument. Returns the first argument on success, and NULL on
117 * error.
118 */
119 extern const struct object_id *nth_packed_object_oid(struct object_id *, struct packed_git *, uint32_t n);
120
121 /*
122 * Return the offset of the nth object within the specified packfile.
123 * The index must already be opened.
124 */
125 extern off_t nth_packed_object_offset(const struct packed_git *, uint32_t n);
126
127 /*
128 * If the object named sha1 is present in the specified packfile,
129 * return its offset within the packfile; otherwise, return 0.
130 */
131 extern off_t find_pack_entry_one(const unsigned char *sha1, struct packed_git *);
132
133 extern int is_pack_valid(struct packed_git *);
134 extern void *unpack_entry(struct repository *r, struct packed_git *, off_t, enum object_type *, unsigned long *);
135 extern unsigned long unpack_object_header_buffer(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep);
136 extern unsigned long get_size_from_delta(struct packed_git *, struct pack_window **, off_t);
137 extern int unpack_object_header(struct packed_git *, struct pack_window **, off_t *, unsigned long *);
138
139 extern void release_pack_memory(size_t);
140
141 /* global flag to enable extra checks when accessing packed objects */
142 extern int do_check_packed_object_crc;
143
144 extern int packed_object_info(struct repository *r,
145 struct packed_git *pack,
146 off_t offset, struct object_info *);
147
148 extern void mark_bad_packed_object(struct packed_git *p, const unsigned char *sha1);
149 extern const struct packed_git *has_packed_and_bad(const unsigned char *sha1);
150
151 /*
152 * Iff a pack file in the given repository contains the object named by sha1,
153 * return true and store its location to e.
154 */
155 extern int find_pack_entry(struct repository *r, const struct object_id *oid, struct pack_entry *e);
156
157 extern int has_object_pack(const struct object_id *oid);
158
159 extern int has_pack_index(const unsigned char *sha1);
160
161 /*
162 * Return 1 if an object in a promisor packfile is or refers to the given
163 * object, 0 otherwise.
164 */
165 extern int is_promisor_object(const struct object_id *oid);
166
167 #endif