ee4056bd2c
The functions found in cache.c are only used by cgit.c, so there's no point in rebuilding all object files when the cache interface is changed. Signed-off-by: Lars Hjemli <hjemli@gmail.com>
121 lines
2.3 KiB
C
121 lines
2.3 KiB
C
/* cache.c: cache management
|
|
*
|
|
* Copyright (C) 2006 Lars Hjemli
|
|
*
|
|
* Licensed under GNU General Public License v2
|
|
* (see COPYING for full license text)
|
|
*/
|
|
|
|
#include "cgit.h"
|
|
#include "cache.h"
|
|
|
|
const int NOLOCK = -1;
|
|
|
|
char *cache_safe_filename(const char *unsafe)
|
|
{
|
|
static char buf[4][PATH_MAX];
|
|
static int bufidx;
|
|
char *s;
|
|
char c;
|
|
|
|
bufidx++;
|
|
bufidx &= 3;
|
|
s = buf[bufidx];
|
|
|
|
while(unsafe && (c = *unsafe++) != 0) {
|
|
if (c == '/' || c == ' ' || c == '&' || c == '|' ||
|
|
c == '>' || c == '<' || c == '.')
|
|
c = '_';
|
|
*s++ = c;
|
|
}
|
|
*s = '\0';
|
|
return buf[bufidx];
|
|
}
|
|
|
|
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", ctx.cfg.cache_root);
|
|
if (mkdir(path, S_IRWXU) && errno!=EEXIST)
|
|
return 0;
|
|
|
|
if (!ctx.repo)
|
|
return 0;
|
|
|
|
path = fmt("%s/%s", ctx.cfg.cache_root,
|
|
cache_safe_filename(ctx.repo->url));
|
|
|
|
if (mkdir(path, S_IRWXU) && errno!=EEXIST)
|
|
return 0;
|
|
|
|
if (ctx.qry.page) {
|
|
path = fmt("%s/%s/%s", ctx.cfg.cache_root,
|
|
cache_safe_filename(ctx.repo->url),
|
|
ctx.qry.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 > ctx.cfg.cache_max_create_time);
|
|
}
|
|
|
|
int cache_lock(struct cacheitem *item)
|
|
{
|
|
int i = 0;
|
|
char *lockfile = xstrdup(fmt("%s.lock", item->name));
|
|
|
|
top:
|
|
if (++i > ctx.cfg.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);
|
|
}
|