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90cbae9c EN |
1 | #include "git-compat-util.h" |
2 | #include "environment.h" | |
3 | #include "statinfo.h" | |
4 | ||
5143ac07 JH |
5 | /* |
6 | * Munge st_size into an unsigned int. | |
7 | */ | |
8 | static unsigned int munge_st_size(off_t st_size) { | |
9 | unsigned int sd_size = st_size; | |
10 | ||
11 | /* | |
12 | * If the file is an exact multiple of 4 GiB, modify the value so it | |
13 | * doesn't get marked as racily clean (zero). | |
14 | */ | |
15 | if (!sd_size && st_size) | |
16 | return 0x80000000; | |
17 | else | |
18 | return sd_size; | |
19 | } | |
20 | ||
90cbae9c EN |
21 | void fill_stat_data(struct stat_data *sd, struct stat *st) |
22 | { | |
23 | sd->sd_ctime.sec = (unsigned int)st->st_ctime; | |
24 | sd->sd_mtime.sec = (unsigned int)st->st_mtime; | |
25 | sd->sd_ctime.nsec = ST_CTIME_NSEC(*st); | |
26 | sd->sd_mtime.nsec = ST_MTIME_NSEC(*st); | |
27 | sd->sd_dev = st->st_dev; | |
28 | sd->sd_ino = st->st_ino; | |
29 | sd->sd_uid = st->st_uid; | |
30 | sd->sd_gid = st->st_gid; | |
5143ac07 | 31 | sd->sd_size = munge_st_size(st->st_size); |
90cbae9c EN |
32 | } |
33 | ||
c33fa871 JH |
34 | static void set_times(struct stat *st, const struct stat_data *sd) |
35 | { | |
36 | st->st_ctime = sd->sd_ctime.sec; | |
37 | st->st_mtime = sd->sd_mtime.sec; | |
38 | #ifdef NO_NSEC | |
39 | ; /* nothing */ | |
40 | #else | |
41 | #ifdef USE_ST_TIMESPEC | |
42 | st->st_ctimespec.tv_nsec = sd->sd_ctime.nsec; | |
43 | st->st_mtimespec.tv_nsec = sd->sd_mtime.nsec; | |
44 | #else | |
45 | st->st_ctim.tv_nsec = sd->sd_ctime.nsec; | |
46 | st->st_mtim.tv_nsec = sd->sd_mtime.nsec; | |
47 | #endif | |
48 | #endif | |
49 | } | |
50 | ||
51 | void fake_lstat_data(const struct stat_data *sd, struct stat *st) | |
52 | { | |
53 | set_times(st, sd); | |
54 | st->st_dev = sd->sd_dev; | |
55 | st->st_ino = sd->sd_ino; | |
56 | st->st_uid = sd->sd_uid; | |
57 | st->st_gid = sd->sd_gid; | |
58 | st->st_size = sd->sd_size; | |
59 | } | |
60 | ||
90cbae9c EN |
61 | int match_stat_data(const struct stat_data *sd, struct stat *st) |
62 | { | |
63 | int changed = 0; | |
64 | ||
65 | if (sd->sd_mtime.sec != (unsigned int)st->st_mtime) | |
66 | changed |= MTIME_CHANGED; | |
67 | if (trust_ctime && check_stat && | |
68 | sd->sd_ctime.sec != (unsigned int)st->st_ctime) | |
69 | changed |= CTIME_CHANGED; | |
70 | ||
71 | #ifdef USE_NSEC | |
72 | if (check_stat && sd->sd_mtime.nsec != ST_MTIME_NSEC(*st)) | |
73 | changed |= MTIME_CHANGED; | |
74 | if (trust_ctime && check_stat && | |
75 | sd->sd_ctime.nsec != ST_CTIME_NSEC(*st)) | |
76 | changed |= CTIME_CHANGED; | |
77 | #endif | |
78 | ||
79 | if (check_stat) { | |
80 | if (sd->sd_uid != (unsigned int) st->st_uid || | |
81 | sd->sd_gid != (unsigned int) st->st_gid) | |
82 | changed |= OWNER_CHANGED; | |
83 | if (sd->sd_ino != (unsigned int) st->st_ino) | |
84 | changed |= INODE_CHANGED; | |
85 | } | |
86 | ||
87 | #ifdef USE_STDEV | |
88 | /* | |
89 | * st_dev breaks on network filesystems where different | |
90 | * clients will have different views of what "device" | |
91 | * the filesystem is on | |
92 | */ | |
93 | if (check_stat && sd->sd_dev != (unsigned int) st->st_dev) | |
94 | changed |= INODE_CHANGED; | |
95 | #endif | |
96 | ||
5143ac07 | 97 | if (sd->sd_size != munge_st_size(st->st_size)) |
90cbae9c EN |
98 | changed |= DATA_CHANGED; |
99 | ||
100 | return changed; | |
101 | } | |
102 | ||
103 | void stat_validity_clear(struct stat_validity *sv) | |
104 | { | |
105 | FREE_AND_NULL(sv->sd); | |
106 | } | |
107 | ||
108 | int stat_validity_check(struct stat_validity *sv, const char *path) | |
109 | { | |
110 | struct stat st; | |
111 | ||
112 | if (stat(path, &st) < 0) | |
113 | return sv->sd == NULL; | |
114 | if (!sv->sd) | |
115 | return 0; | |
116 | return S_ISREG(st.st_mode) && !match_stat_data(sv->sd, &st); | |
117 | } | |
118 | ||
119 | void stat_validity_update(struct stat_validity *sv, int fd) | |
120 | { | |
121 | struct stat st; | |
122 | ||
123 | if (fstat(fd, &st) < 0 || !S_ISREG(st.st_mode)) | |
124 | stat_validity_clear(sv); | |
125 | else { | |
126 | if (!sv->sd) | |
127 | CALLOC_ARRAY(sv->sd, 1); | |
128 | fill_stat_data(sv->sd, &st); | |
129 | } | |
130 | } |