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