fcopy: handle case where src is a symlink to a directory

src/fcopy/main.c

@@ -403,8 +403,11 @@ static void duplicate_link(const char *src, const char *dest, struct stat *s) {
  mode_t mode = s->st_mode;
 
  // NixOS problem #4887:
- // /etc/fonts is a double symlink to a directory - copy the files instead of copying the symlink
- if (strcmp(src, "/etc/fonts") == 0) {
+ // /etc/fonts is a directory symlink - and we don't want to copy
+ // symlinks to directories as if they were files. Instead;
+ // duplicate the source directory instead
+ struct stat s_follow;
+ if (stat(rsrc, &s_follow) == EXIT_SUCCESS && S_ISDIR(s_follow.st_mode)) {
  duplicate_dir(src, dest, s);
  free(rsrc);
  free(rdest);