ref: v0.6.1
./cache.c
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/* 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" 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", cgit_cache_root); if (mkdir(path, S_IRWXU) && errno!=EEXIST) return 0; if (!cgit_repo) return 0; path = fmt("%s/%s", cgit_cache_root, cache_safe_filename(cgit_repo->url)); if (mkdir(path, S_IRWXU) && errno!=EEXIST) return 0; if (cgit_query_page) { path = fmt("%s/%s/%s", cgit_cache_root, cache_safe_filename(cgit_repo->url), 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); } |