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120 lines
2.3 KiB
C
120 lines
2.3 KiB
C
/* cache.c: cache management
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*
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* Copyright (C) 2006 Lars Hjemli
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*
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* Licensed under GNU General Public License v2
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* (see COPYING for full license text)
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*/
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#include "cgit.h"
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const int NOLOCK = -1;
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char *cache_safe_filename(const char *unsafe)
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{
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static char buf[4][PATH_MAX];
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static int bufidx;
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char *s;
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char c;
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bufidx++;
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bufidx &= 3;
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s = buf[bufidx];
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while(unsafe && (c = *unsafe++) != 0) {
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if (c == '/' || c == ' ' || c == '&' || c == '|' ||
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c == '>' || c == '<' || c == '.')
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c = '_';
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*s++ = c;
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}
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*s = '\0';
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return buf[bufidx];
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}
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int cache_exist(struct cacheitem *item)
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{
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if (stat(item->name, &item->st)) {
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item->st.st_mtime = 0;
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return 0;
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}
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return 1;
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}
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int cache_create_dirs()
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{
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char *path;
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path = fmt("%s", ctx.cfg.cache_root);
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if (mkdir(path, S_IRWXU) && errno!=EEXIST)
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return 0;
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if (!ctx.repo)
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return 0;
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path = fmt("%s/%s", ctx.cfg.cache_root,
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cache_safe_filename(ctx.repo->url));
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if (mkdir(path, S_IRWXU) && errno!=EEXIST)
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return 0;
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if (ctx.qry.page) {
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path = fmt("%s/%s/%s", ctx.cfg.cache_root,
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cache_safe_filename(ctx.repo->url),
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ctx.qry.page);
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if (mkdir(path, S_IRWXU) && errno!=EEXIST)
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return 0;
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}
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return 1;
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}
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int cache_refill_overdue(const char *lockfile)
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{
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struct stat st;
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if (stat(lockfile, &st))
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return 0;
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else
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return (time(NULL) - st.st_mtime > ctx.cfg.cache_max_create_time);
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}
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int cache_lock(struct cacheitem *item)
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{
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int i = 0;
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char *lockfile = xstrdup(fmt("%s.lock", item->name));
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top:
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if (++i > ctx.cfg.max_lock_attempts)
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die("cache_lock: unable to lock %s: %s",
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item->name, strerror(errno));
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item->fd = open(lockfile, O_WRONLY|O_CREAT|O_EXCL, S_IRUSR|S_IWUSR);
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if (item->fd == NOLOCK && errno == ENOENT && cache_create_dirs())
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goto top;
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if (item->fd == NOLOCK && errno == EEXIST &&
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cache_refill_overdue(lockfile) && !unlink(lockfile))
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goto top;
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free(lockfile);
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return (item->fd > 0);
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}
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int cache_unlock(struct cacheitem *item)
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{
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close(item->fd);
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return (rename(fmt("%s.lock", item->name), item->name) == 0);
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}
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int cache_cancel_lock(struct cacheitem *item)
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{
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return (unlink(fmt("%s.lock", item->name)) == 0);
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}
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int cache_expired(struct cacheitem *item)
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{
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if (item->ttl < 0)
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return 0;
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return item->st.st_mtime + item->ttl * 60 < time(NULL);
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}
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