config: Create initial configuration file from stats limits

diff --git a/ccache.c b/ccache.c
index 19a8d4afd6021a67c517a64644632a111f44311f..531c7bc965a9d2b889818d7141066ea3e24c938e 100644 (file)
--- a/ccache.c
+++ b/ccache.c
@@ -70,6 +70,10 @@ static const char USAGE_TEXT[] =
 "\n"
 "See also <http://ccache.samba.org>.\n";
 
+#ifndef DEFAULT_MAXSIZE
+#define DEFAULT_MAXSIZE (1024*1024)
+#endif
+
 /* Global configuration data. */
 struct conf *conf = NULL;
 
@@ -1767,15 +1771,55 @@ out:
        return result;
 }
 
+static void
+create_initial_config_file(const char *path)
+{
+       unsigned max_files, max_size;
+       char *stats_dir;
+       FILE *f;
+       struct stat st;
+
+       if (create_parent_dirs(path) != 0) {
+               return;
+       }
+
+       stats_dir = format("%s/0", conf->cache_dir);
+       if (stat(stats_dir, &st) == 0) {
+               stats_get_limits(stats_dir, &max_files, &max_size);
+               /* STATS_MAXFILES and STATS_MAXSIZE was stored for each top directory. */
+               max_files *= 16;
+               max_size *= 16;
+       } else {
+               max_files = 0;
+               max_size = DEFAULT_MAXSIZE;
+       }
+       free(stats_dir);
+
+       f = fopen(path, "w");
+       if (!f) {
+               return;
+       }
+       if (max_files != 0) {
+               fprintf(f, "max_files = %u\n", max_files);
+       }
+       if (max_size != 0) {
+               char *size = format_parsable_size_with_suffix(max_size);
+               fprintf(f, "max_size = %s\n", size);
+               free(size);
+       }
+       fclose(f);
+}
+
 /*
- * Read config file(s), populate variables, create cache directory if missing,
- * etc.
+ * Read config file(s), populate variables, create configuration file in cache
+ * directory if missing, etc.
  */
 static void
 initialize(void)
 {
        char *errmsg;
        char *p;
+       struct stat st;
 
        conf_free(conf);
        conf = conf_create();
@@ -1786,9 +1830,15 @@ initialize(void)
                        fatal("%s", errmsg);
                }
        } else {
-               char *sysconf_config_path = format("%s/ccache.conf", TO_STRING(SYSCONFDIR));
+               char *sysconf_config_path;
+               char *cachedir_config_path;
+
+               sysconf_config_path = format("%s/ccache.conf", TO_STRING(SYSCONFDIR));
                if (!conf_read(conf, sysconf_config_path, &errmsg)) {
-                       fatal("%s", errmsg);
+                       if (stat(sysconf_config_path, &st) == 0) {
+                               fatal("%s", errmsg);
+                       }
+                       /* Missing config file in SYSCONFDIR is OK. */
                }
                free(sysconf_config_path);
 
@@ -1797,9 +1847,12 @@ initialize(void)
                        conf->cache_dir = strdup(p);
                }
 
-               char *cachedir_config_path = format("%s/ccache.conf", conf->cache_dir);
+               cachedir_config_path = format("%s/ccache.conf", conf->cache_dir);
                if (!conf_read(conf, cachedir_config_path, &errmsg)) {
-                       fatal("%s", errmsg);
+                       if (stat(cachedir_config_path, &st) == 0) {
+                               fatal("%s", errmsg);
+                       }
+                       create_initial_config_file(cachedir_config_path);
                }
                free(cachedir_config_path);
        }