Always symlinking the latest "jdk" to a certain path

4

I use this approach:

  environment.etc = with pkgs; {
    "jdk".source = jdk;
    "jdk8".source = jdk8;
    "jdk12".source = jdk12;
  };

which gives:

$ ls -l /etc/jdk*
lrwxrwxrwx 1 root root 15 Jun  3 07:38 /etc/jdk -> /etc/static/jdk
lrwxrwxrwx 1 root root 17 Jun  3 07:38 /etc/jdk12 -> /etc/static/jdk12
lrwxrwxrwx 1 root root 16 Jun  3 07:38 /etc/jdk8 -> /etc/static/jdk8

$ ls -l /etc/static/jdk*
lrwxrwxrwx 3 root root 60 Dec 31  1969 /etc/static/jdk -> /nix/store/16fgzv12dnlwbblxrmnf132jb2y2jg5v-openjdk-8u212-ga
lrwxrwxrwx 2 root root 57 Dec 31  1969 /etc/static/jdk12 -> /nix/store/z8mdrhyp1jxn9jxwsl2qkkw59qj9md0j-openjdk-12-ga
lrwxrwxrwx 3 root root 60 Dec 31  1969 /etc/static/jdk8 -> /nix/store/16fgzv12dnlwbblxrmnf132jb2y2jg5v-openjdk-8u212-ga
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