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Commit | Line | Data |
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a6dc3d36 | 1 | #include "cache.h" |
f394e093 | 2 | #include "gettext.h" |
94cd775a TB |
3 | #include "pack-mtimes.h" |
4 | #include "object-store.h" | |
5 | #include "packfile.h" | |
6 | ||
7 | static char *pack_mtimes_filename(struct packed_git *p) | |
8 | { | |
9 | size_t len; | |
10 | if (!strip_suffix(p->pack_name, ".pack", &len)) | |
11 | BUG("pack_name does not end in .pack"); | |
12 | return xstrfmt("%.*s.mtimes", (int)len, p->pack_name); | |
13 | } | |
14 | ||
15 | #define MTIMES_HEADER_SIZE (12) | |
16 | ||
17 | struct mtimes_header { | |
18 | uint32_t signature; | |
19 | uint32_t version; | |
20 | uint32_t hash_id; | |
21 | }; | |
22 | ||
23 | static int load_pack_mtimes_file(char *mtimes_file, | |
24 | uint32_t num_objects, | |
25 | const uint32_t **data_p, size_t *len_p) | |
26 | { | |
27 | int fd, ret = 0; | |
28 | struct stat st; | |
29 | uint32_t *data = NULL; | |
30 | size_t mtimes_size, expected_size; | |
31 | struct mtimes_header header; | |
32 | ||
33 | fd = git_open(mtimes_file); | |
34 | ||
35 | if (fd < 0) { | |
36 | ret = -1; | |
37 | goto cleanup; | |
38 | } | |
39 | if (fstat(fd, &st)) { | |
40 | ret = error_errno(_("failed to read %s"), mtimes_file); | |
41 | goto cleanup; | |
42 | } | |
43 | ||
44 | mtimes_size = xsize_t(st.st_size); | |
45 | ||
46 | if (mtimes_size < MTIMES_HEADER_SIZE) { | |
47 | ret = error(_("mtimes file %s is too small"), mtimes_file); | |
48 | goto cleanup; | |
49 | } | |
50 | ||
51 | data = xmmap(NULL, mtimes_size, PROT_READ, MAP_PRIVATE, fd, 0); | |
52 | ||
53 | header.signature = ntohl(data[0]); | |
54 | header.version = ntohl(data[1]); | |
55 | header.hash_id = ntohl(data[2]); | |
56 | ||
57 | if (header.signature != MTIMES_SIGNATURE) { | |
58 | ret = error(_("mtimes file %s has unknown signature"), mtimes_file); | |
59 | goto cleanup; | |
60 | } | |
61 | ||
62 | if (header.version != 1) { | |
63 | ret = error(_("mtimes file %s has unsupported version %"PRIu32), | |
64 | mtimes_file, header.version); | |
65 | goto cleanup; | |
66 | } | |
67 | ||
68 | if (!(header.hash_id == 1 || header.hash_id == 2)) { | |
69 | ret = error(_("mtimes file %s has unsupported hash id %"PRIu32), | |
70 | mtimes_file, header.hash_id); | |
71 | goto cleanup; | |
72 | } | |
73 | ||
74 | ||
75 | expected_size = MTIMES_HEADER_SIZE; | |
76 | expected_size = st_add(expected_size, st_mult(sizeof(uint32_t), num_objects)); | |
77 | expected_size = st_add(expected_size, 2 * (header.hash_id == 1 ? GIT_SHA1_RAWSZ : GIT_SHA256_RAWSZ)); | |
78 | ||
79 | if (mtimes_size != expected_size) { | |
80 | ret = error(_("mtimes file %s is corrupt"), mtimes_file); | |
81 | goto cleanup; | |
82 | } | |
83 | ||
84 | cleanup: | |
85 | if (ret) { | |
86 | if (data) | |
87 | munmap(data, mtimes_size); | |
88 | } else { | |
89 | *len_p = mtimes_size; | |
90 | *data_p = data; | |
91 | } | |
92 | ||
41f1a8e6 JS |
93 | if (fd >= 0) |
94 | close(fd); | |
94cd775a TB |
95 | return ret; |
96 | } | |
97 | ||
98 | int load_pack_mtimes(struct packed_git *p) | |
99 | { | |
100 | char *mtimes_name = NULL; | |
101 | int ret = 0; | |
102 | ||
103 | if (!p->is_cruft) | |
104 | return ret; /* not a cruft pack */ | |
105 | if (p->mtimes_map) | |
106 | return ret; /* already loaded */ | |
107 | ||
108 | ret = open_pack_index(p); | |
109 | if (ret < 0) | |
110 | goto cleanup; | |
111 | ||
112 | mtimes_name = pack_mtimes_filename(p); | |
113 | ret = load_pack_mtimes_file(mtimes_name, | |
114 | p->num_objects, | |
115 | &p->mtimes_map, | |
116 | &p->mtimes_size); | |
117 | cleanup: | |
118 | free(mtimes_name); | |
119 | return ret; | |
120 | } | |
121 | ||
122 | uint32_t nth_packed_mtime(struct packed_git *p, uint32_t pos) | |
123 | { | |
124 | if (!p->mtimes_map) | |
125 | BUG("pack .mtimes file not loaded for %s", p->pack_name); | |
126 | if (p->num_objects <= pos) | |
127 | BUG("pack .mtimes out-of-bounds (%"PRIu32" vs %"PRIu32")", | |
128 | pos, p->num_objects); | |
129 | ||
130 | return get_be32(p->mtimes_map + pos + 3); | |
131 | } |