Hey all, I would much appreciate your feedback on https://github.com/NixOS/rfcs/pull/196: Self-describing store
This RFC proposes that stores provide a nix-store.json file declaring their properties, enabling:

• Discovery of store settings (storeDir, encoding, etc.)
• Forward compatibility through explicit feature requirements
• A unified replacement for the ad hoc nix-cache-info format

raitobezarius: I think I'm running into another auto-allocate-uids issue:

error: builder for '/nix/store/pc5v80nx8jivzxhxffm70bs1zh63qvyw-xz-5.8.2.tar.gz.drv' failed due to signal 6 (Aborted);
       last 2 log lines:
       > terminate called after throwing an instance of 'nix::Error'
       >   what():  error: cannot determine user's home directory
       For full logs, run:
              nix log /nix/store/pc5v80nx8jivzxhxffm70bs1zh63qvyw-xz-5.8.2.tar.gz.drv

The derivation is a simple FOD:

{
  "/nix/store/pc5v80nx8jivzxhxffm70bs1zh63qvyw-xz-5.8.2.tar.gz.drv": {
    "args": [],
    "builder": "builtin:fetchurl",
    "env": {
      "builder": "builtin:fetchurl",
      "executable": "",
      "impureEnvVars": "http_proxy https_proxy ftp_proxy all_proxy no_proxy",
      "name": "xz-5.8.2.tar.gz",
      "out": "/nix/store/xrv68kp91cigq0ndy0zm4fa9zwkalv9d-xz-5.8.2.tar.gz",
      "outputHash": "sha256-zgnFCllieGuD5do4nJDdLBXs0JgKJY3QH3D5585YqPE=",
      "outputHashAlgo": "",
      "outputHashMode": "flat",
      "preferLocalBuild": "1",
      "system": "builtin",
      "unpack": "",
      "url": "https://tukaani.org/xz/xz-5.8.2.tar.gz",
      "urls": "https://tukaani.org/xz/xz-5.8.2.tar.gz"
    },
    "inputDrvs": {},
    "inputSrcs": [],
    "name": "xz-5.8.2.tar.gz",
    "outputs": {
      "out": {
        "hash": "ce09c50a5962786b83e5da389c90dd2c15ecd0980a258dd01f70f9e7ce58a8f1",
        "hashAlgo": "sha256",
        "path": "/nix/store/xrv68kp91cigq0ndy0zm4fa9zwkalv9d-xz-5.8.2.tar.gz"
      }
    },
    "system": "builtin"
  }
}