vzctl - vps_save_config will overwrite a CTs config if it is a symlink

A symlink to a CTs config is overwritten by vps_save_config() on writeback, this is because a symlink to the config is not dereferenced

The first (very simple) fix:

--- a/src/lib/config.c 2009-11-04 08:39:18.000000000 +0100
+++ b/src/lib/config.c 2009-11-04 08:39:18.000000000 +0100
@@ -2351,6 +2351,8 @@
        vps_param *tmp_old_p = NULL;
        list_head_t conf, new_conf;
        int ret, n;
+ char buf[4096];
+ ssize_t llen;

        list_head_init(&conf);
        list_head_init(&new_conf);
@@ -2359,6 +2361,13 @@
                vps_parse_config(veid, path, tmp_old_p, action);
                old_p = tmp_old_p;
        }
+
+ /* if path is a symlink dereference it */
+ if ((llen = readlink(path, buf, sizeof(buf)-1)) != -1) {
+ buf[llen] = '\0';
+ strcpy(path,buf);
+ }
+
        if ((ret = read_conf(path, &conf)))
                return ret;
        n = store(old_p, new_p, &new_conf);

But as ldv suggested it makes more sense to use canonicalize_file_name()

The following snip is not working for me ... not sure why?
  -> implicit declaration of function 'canonicalize_file_name'


static int write_conf(char *fname, list_head_t *head)
  ...
  file = canonicalize_file_name(fname);
  ...