common: Return realpath'd config dir where possible

This ensures we only use a sane realpath and collapse the slashes where we can to allow trivial string matching. Signed-off-by: Ikey Doherty <ikey@solus-project.com>

Author: ikeydoherty

src/common/files.c

@@ -55,16 +55,26 @@ char *lsi_get_user_config_dir()
  const char *home = NULL;
  char *c = NULL;
  char *xdg_config = getenv("XDG_CONFIG_HOME");
+ char *p = NULL;
 
  /* Respect the XDG_CONFIG_HOME variable if it is set */
  if (xdg_config) {
+ p = realpath(xdg_config, NULL);
+ if (p) {
+ return p;
+ }
  return strdup(xdg_config);
  }
 
  home = lsi_get_home_dir();
  if (asprintf(&c, "%s/.config", home) < 0) {
  return NULL;
  }
+ p = realpath(c, NULL);
+ if (p) {
+ free(c);
+ return p;
+ }
  return c;
 }