1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
|
#include "cgit.h"
const int NOLOCK = -1;
char *cache_safe_filename(const char *unsafe)
{
static char buf[PATH_MAX];
char *s = buf;
char c;
while(unsafe && (c = *unsafe++) != 0) {
if (c == '/' || c == ' ' || c == '&' || c == '|' ||
c == '>' || c == '<' || c == '.')
c = '_';
*s++ = c;
}
*s = '\0';
return buf;
}
int cache_exist(struct cacheitem *item)
{
if (stat(item->name, &item->st)) {
item->st.st_mtime = 0;
return 0;
}
return 1;
}
int cache_create_dirs()
{
char *path;
path = fmt("%s", cgit_cache_root);
if (mkdir(path, S_IRWXU) && errno!=EEXIST)
return 0;
if (!cgit_query_repo)
return 0;
path = fmt("%s/%s", cgit_cache_root, cgit_query_repo);
if (mkdir(path, S_IRWXU) && errno!=EEXIST)
return 0;
if (cgit_query_page) {
path = fmt("%s/%s/%s", cgit_cache_root, cgit_query_repo,
cgit_query_page);
if (mkdir(path, S_IRWXU) && errno!=EEXIST)
return 0;
}
return 1;
}
int cache_refill_overdue(const char *lockfile)
{
struct stat st;
if (stat(lockfile, &st))
return 0;
else
return (time(NULL) - st.st_mtime > cgit_cache_max_create_time);
}
int cache_lock(struct cacheitem *item)
{
int i = 0;
char *lockfile = xstrdup(fmt("%s.lock", item->name));
top:
if (++i > cgit_max_lock_attempts)
die("cache_lock: unable to lock %s: %s",
item->name, strerror(errno));
item->fd = open(lockfile, O_WRONLY|O_CREAT|O_EXCL, S_IRUSR|S_IWUSR);
if (item->fd == NOLOCK && errno == ENOENT && cache_create_dirs())
goto top;
if (item->fd == NOLOCK && errno == EEXIST &&
cache_refill_overdue(lockfile) && !unlink(lockfile))
goto top;
free(lockfile);
return (item->fd > 0);
}
int cache_unlock(struct cacheitem *item)
{
close(item->fd);
return (rename(fmt("%s.lock", item->name), item->name) == 0);
}
int cache_cancel_lock(struct cacheitem *item)
{
return (unlink(fmt("%s.lock", item->name)) == 0);
}
int cache_expired(struct cacheitem *item)
{
if (item->ttl < 0)
return 0;
return item->st.st_mtime + item->ttl * 60 < time(NULL);
}
|
