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Commit | Line | Data |
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b6fdc44c | 1 | #include "git-compat-util.h" |
f394e093 | 2 | #include "gettext.h" |
94cd775a | 3 | #include "pack-mtimes.h" |
87bed179 | 4 | #include "object-file.h" |
a034e910 | 5 | #include "object-store-ll.h" |
94cd775a | 6 | #include "packfile.h" |
a034e910 | 7 | #include "strbuf.h" |
94cd775a TB |
8 | |
9 | static char *pack_mtimes_filename(struct packed_git *p) | |
10 | { | |
11 | size_t len; | |
12 | if (!strip_suffix(p->pack_name, ".pack", &len)) | |
13 | BUG("pack_name does not end in .pack"); | |
14 | return xstrfmt("%.*s.mtimes", (int)len, p->pack_name); | |
15 | } | |
16 | ||
17 | #define MTIMES_HEADER_SIZE (12) | |
18 | ||
19 | struct mtimes_header { | |
20 | uint32_t signature; | |
21 | uint32_t version; | |
22 | uint32_t hash_id; | |
23 | }; | |
24 | ||
25 | static int load_pack_mtimes_file(char *mtimes_file, | |
26 | uint32_t num_objects, | |
27 | const uint32_t **data_p, size_t *len_p) | |
28 | { | |
29 | int fd, ret = 0; | |
30 | struct stat st; | |
31 | uint32_t *data = NULL; | |
32 | size_t mtimes_size, expected_size; | |
33 | struct mtimes_header header; | |
34 | ||
35 | fd = git_open(mtimes_file); | |
36 | ||
37 | if (fd < 0) { | |
38 | ret = -1; | |
39 | goto cleanup; | |
40 | } | |
41 | if (fstat(fd, &st)) { | |
42 | ret = error_errno(_("failed to read %s"), mtimes_file); | |
43 | goto cleanup; | |
44 | } | |
45 | ||
46 | mtimes_size = xsize_t(st.st_size); | |
47 | ||
48 | if (mtimes_size < MTIMES_HEADER_SIZE) { | |
49 | ret = error(_("mtimes file %s is too small"), mtimes_file); | |
50 | goto cleanup; | |
51 | } | |
52 | ||
53 | data = xmmap(NULL, mtimes_size, PROT_READ, MAP_PRIVATE, fd, 0); | |
54 | ||
55 | header.signature = ntohl(data[0]); | |
56 | header.version = ntohl(data[1]); | |
57 | header.hash_id = ntohl(data[2]); | |
58 | ||
59 | if (header.signature != MTIMES_SIGNATURE) { | |
60 | ret = error(_("mtimes file %s has unknown signature"), mtimes_file); | |
61 | goto cleanup; | |
62 | } | |
63 | ||
64 | if (header.version != 1) { | |
65 | ret = error(_("mtimes file %s has unsupported version %"PRIu32), | |
66 | mtimes_file, header.version); | |
67 | goto cleanup; | |
68 | } | |
69 | ||
70 | if (!(header.hash_id == 1 || header.hash_id == 2)) { | |
71 | ret = error(_("mtimes file %s has unsupported hash id %"PRIu32), | |
72 | mtimes_file, header.hash_id); | |
73 | goto cleanup; | |
74 | } | |
75 | ||
76 | ||
77 | expected_size = MTIMES_HEADER_SIZE; | |
78 | expected_size = st_add(expected_size, st_mult(sizeof(uint32_t), num_objects)); | |
79 | expected_size = st_add(expected_size, 2 * (header.hash_id == 1 ? GIT_SHA1_RAWSZ : GIT_SHA256_RAWSZ)); | |
80 | ||
81 | if (mtimes_size != expected_size) { | |
82 | ret = error(_("mtimes file %s is corrupt"), mtimes_file); | |
83 | goto cleanup; | |
84 | } | |
85 | ||
86 | cleanup: | |
87 | if (ret) { | |
88 | if (data) | |
89 | munmap(data, mtimes_size); | |
90 | } else { | |
91 | *len_p = mtimes_size; | |
92 | *data_p = data; | |
93 | } | |
94 | ||
41f1a8e6 JS |
95 | if (fd >= 0) |
96 | close(fd); | |
94cd775a TB |
97 | return ret; |
98 | } | |
99 | ||
100 | int load_pack_mtimes(struct packed_git *p) | |
101 | { | |
102 | char *mtimes_name = NULL; | |
103 | int ret = 0; | |
104 | ||
105 | if (!p->is_cruft) | |
106 | return ret; /* not a cruft pack */ | |
107 | if (p->mtimes_map) | |
108 | return ret; /* already loaded */ | |
109 | ||
110 | ret = open_pack_index(p); | |
111 | if (ret < 0) | |
112 | goto cleanup; | |
113 | ||
114 | mtimes_name = pack_mtimes_filename(p); | |
115 | ret = load_pack_mtimes_file(mtimes_name, | |
116 | p->num_objects, | |
117 | &p->mtimes_map, | |
118 | &p->mtimes_size); | |
119 | cleanup: | |
120 | free(mtimes_name); | |
121 | return ret; | |
122 | } | |
123 | ||
124 | uint32_t nth_packed_mtime(struct packed_git *p, uint32_t pos) | |
125 | { | |
126 | if (!p->mtimes_map) | |
127 | BUG("pack .mtimes file not loaded for %s", p->pack_name); | |
128 | if (p->num_objects <= pos) | |
129 | BUG("pack .mtimes out-of-bounds (%"PRIu32" vs %"PRIu32")", | |
130 | pos, p->num_objects); | |
131 | ||
132 | return get_be32(p->mtimes_map + pos + 3); | |
133 | } |