]>
Commit | Line | Data |
---|---|---|
b6fdc44c | 1 | #include "git-compat-util.h" |
f394e093 | 2 | #include "gettext.h" |
94cd775a | 3 | #include "pack-mtimes.h" |
87bed179 | 4 | #include "object-file.h" |
94cd775a TB |
5 | #include "object-store.h" |
6 | #include "packfile.h" | |
7 | ||
8 | static char *pack_mtimes_filename(struct packed_git *p) | |
9 | { | |
10 | size_t len; | |
11 | if (!strip_suffix(p->pack_name, ".pack", &len)) | |
12 | BUG("pack_name does not end in .pack"); | |
13 | return xstrfmt("%.*s.mtimes", (int)len, p->pack_name); | |
14 | } | |
15 | ||
16 | #define MTIMES_HEADER_SIZE (12) | |
17 | ||
18 | struct mtimes_header { | |
19 | uint32_t signature; | |
20 | uint32_t version; | |
21 | uint32_t hash_id; | |
22 | }; | |
23 | ||
24 | static int load_pack_mtimes_file(char *mtimes_file, | |
25 | uint32_t num_objects, | |
26 | const uint32_t **data_p, size_t *len_p) | |
27 | { | |
28 | int fd, ret = 0; | |
29 | struct stat st; | |
30 | uint32_t *data = NULL; | |
31 | size_t mtimes_size, expected_size; | |
32 | struct mtimes_header header; | |
33 | ||
34 | fd = git_open(mtimes_file); | |
35 | ||
36 | if (fd < 0) { | |
37 | ret = -1; | |
38 | goto cleanup; | |
39 | } | |
40 | if (fstat(fd, &st)) { | |
41 | ret = error_errno(_("failed to read %s"), mtimes_file); | |
42 | goto cleanup; | |
43 | } | |
44 | ||
45 | mtimes_size = xsize_t(st.st_size); | |
46 | ||
47 | if (mtimes_size < MTIMES_HEADER_SIZE) { | |
48 | ret = error(_("mtimes file %s is too small"), mtimes_file); | |
49 | goto cleanup; | |
50 | } | |
51 | ||
52 | data = xmmap(NULL, mtimes_size, PROT_READ, MAP_PRIVATE, fd, 0); | |
53 | ||
54 | header.signature = ntohl(data[0]); | |
55 | header.version = ntohl(data[1]); | |
56 | header.hash_id = ntohl(data[2]); | |
57 | ||
58 | if (header.signature != MTIMES_SIGNATURE) { | |
59 | ret = error(_("mtimes file %s has unknown signature"), mtimes_file); | |
60 | goto cleanup; | |
61 | } | |
62 | ||
63 | if (header.version != 1) { | |
64 | ret = error(_("mtimes file %s has unsupported version %"PRIu32), | |
65 | mtimes_file, header.version); | |
66 | goto cleanup; | |
67 | } | |
68 | ||
69 | if (!(header.hash_id == 1 || header.hash_id == 2)) { | |
70 | ret = error(_("mtimes file %s has unsupported hash id %"PRIu32), | |
71 | mtimes_file, header.hash_id); | |
72 | goto cleanup; | |
73 | } | |
74 | ||
75 | ||
76 | expected_size = MTIMES_HEADER_SIZE; | |
77 | expected_size = st_add(expected_size, st_mult(sizeof(uint32_t), num_objects)); | |
78 | expected_size = st_add(expected_size, 2 * (header.hash_id == 1 ? GIT_SHA1_RAWSZ : GIT_SHA256_RAWSZ)); | |
79 | ||
80 | if (mtimes_size != expected_size) { | |
81 | ret = error(_("mtimes file %s is corrupt"), mtimes_file); | |
82 | goto cleanup; | |
83 | } | |
84 | ||
85 | cleanup: | |
86 | if (ret) { | |
87 | if (data) | |
88 | munmap(data, mtimes_size); | |
89 | } else { | |
90 | *len_p = mtimes_size; | |
91 | *data_p = data; | |
92 | } | |
93 | ||
41f1a8e6 JS |
94 | if (fd >= 0) |
95 | close(fd); | |
94cd775a TB |
96 | return ret; |
97 | } | |
98 | ||
99 | int load_pack_mtimes(struct packed_git *p) | |
100 | { | |
101 | char *mtimes_name = NULL; | |
102 | int ret = 0; | |
103 | ||
104 | if (!p->is_cruft) | |
105 | return ret; /* not a cruft pack */ | |
106 | if (p->mtimes_map) | |
107 | return ret; /* already loaded */ | |
108 | ||
109 | ret = open_pack_index(p); | |
110 | if (ret < 0) | |
111 | goto cleanup; | |
112 | ||
113 | mtimes_name = pack_mtimes_filename(p); | |
114 | ret = load_pack_mtimes_file(mtimes_name, | |
115 | p->num_objects, | |
116 | &p->mtimes_map, | |
117 | &p->mtimes_size); | |
118 | cleanup: | |
119 | free(mtimes_name); | |
120 | return ret; | |
121 | } | |
122 | ||
123 | uint32_t nth_packed_mtime(struct packed_git *p, uint32_t pos) | |
124 | { | |
125 | if (!p->mtimes_map) | |
126 | BUG("pack .mtimes file not loaded for %s", p->pack_name); | |
127 | if (p->num_objects <= pos) | |
128 | BUG("pack .mtimes out-of-bounds (%"PRIu32" vs %"PRIu32")", | |
129 | pos, p->num_objects); | |
130 | ||
131 | return get_be32(p->mtimes_map + pos + 3); | |
132 | } |