freshlybakedca.ke
Git fork
1#define USE_THE_REPOSITORY_VARIABLE
2
3#include "git-compat-util.h"
4#include "environment.h"
5#include "statinfo.h"
6
7/*
8 * Munge st_size into an unsigned int.
9 */
10static unsigned int munge_st_size(off_t st_size) {
11 unsigned int sd_size = st_size;
12
13 /*
14 * If the file is an exact multiple of 4 GiB, modify the value so it
15 * doesn't get marked as racily clean (zero).
16 */
17 if (!sd_size && st_size)
18 return 0x80000000;
19 else
20 return sd_size;
21}
22
23void fill_stat_data(struct stat_data *sd, struct stat *st)
24{
25 sd->sd_ctime.sec = (unsigned int)st->st_ctime;
26 sd->sd_mtime.sec = (unsigned int)st->st_mtime;
27 sd->sd_ctime.nsec = ST_CTIME_NSEC(*st);
28 sd->sd_mtime.nsec = ST_MTIME_NSEC(*st);
29 sd->sd_dev = st->st_dev;
30 sd->sd_ino = st->st_ino;
31 sd->sd_uid = st->st_uid;
32 sd->sd_gid = st->st_gid;
33 sd->sd_size = munge_st_size(st->st_size);
34}
35
36static void set_times(struct stat *st, const struct stat_data *sd)
37{
38 st->st_ctime = sd->sd_ctime.sec;
39 st->st_mtime = sd->sd_mtime.sec;
40#ifdef NO_NSEC
41 ; /* nothing */
42#else
43#ifdef USE_ST_TIMESPEC
44 st->st_ctimespec.tv_nsec = sd->sd_ctime.nsec;
45 st->st_mtimespec.tv_nsec = sd->sd_mtime.nsec;
46#else
47 st->st_ctim.tv_nsec = sd->sd_ctime.nsec;
48 st->st_mtim.tv_nsec = sd->sd_mtime.nsec;
49#endif
50#endif
51}
52
53void fake_lstat_data(const struct stat_data *sd, struct stat *st)
54{
55 set_times(st, sd);
56 st->st_dev = sd->sd_dev;
57 st->st_ino = sd->sd_ino;
58 st->st_uid = sd->sd_uid;
59 st->st_gid = sd->sd_gid;
60 st->st_size = sd->sd_size;
61}
62
63int match_stat_data(const struct stat_data *sd, struct stat *st)
64{
65 int changed = 0;
66
67 if (sd->sd_mtime.sec != (unsigned int)st->st_mtime)
68 changed |= MTIME_CHANGED;
69 if (trust_ctime && check_stat &&
70 sd->sd_ctime.sec != (unsigned int)st->st_ctime)
71 changed |= CTIME_CHANGED;
72
73#ifdef USE_NSEC
74 if (check_stat && sd->sd_mtime.nsec != ST_MTIME_NSEC(*st))
75 changed |= MTIME_CHANGED;
76 if (trust_ctime && check_stat &&
77 sd->sd_ctime.nsec != ST_CTIME_NSEC(*st))
78 changed |= CTIME_CHANGED;
79#endif
80
81 if (check_stat) {
82 if (sd->sd_uid != (unsigned int) st->st_uid ||
83 sd->sd_gid != (unsigned int) st->st_gid)
84 changed |= OWNER_CHANGED;
85 if (sd->sd_ino != (unsigned int) st->st_ino)
86 changed |= INODE_CHANGED;
87 }
88
89#ifdef USE_STDEV
90 /*
91 * st_dev breaks on network filesystems where different
92 * clients will have different views of what "device"
93 * the filesystem is on
94 */
95 if (check_stat && sd->sd_dev != (unsigned int) st->st_dev)
96 changed |= INODE_CHANGED;
97#endif
98
99 if (sd->sd_size != munge_st_size(st->st_size))
100 changed |= DATA_CHANGED;
101
102 return changed;
103}
104
105void stat_validity_clear(struct stat_validity *sv)
106{
107 FREE_AND_NULL(sv->sd);
108}
109
110int stat_validity_check(struct stat_validity *sv, const char *path)
111{
112 struct stat st;
113
114 if (stat(path, &st) < 0)
115 return sv->sd == NULL;
116 if (!sv->sd)
117 return 0;
118 return S_ISREG(st.st_mode) && !match_stat_data(sv->sd, &st);
119}
120
121void stat_validity_update(struct stat_validity *sv, int fd)
122{
123 struct stat st;
124
125 if (fstat(fd, &st) < 0 || !S_ISREG(st.st_mode))
126 stat_validity_clear(sv);
127 else {
128 if (!sv->sd)
129 CALLOC_ARRAY(sv->sd, 1);
130 fill_stat_data(sv->sd, &st);
131 }
132}