Nixpkgs: buildRustPackage fails with recent nightly Cargo

[lostman]

Issue description

buildRustPackage with rustChannelOf { channel = "nightly"; date = "2019-05-07"; } succeeds while date = "2019-05-08" (and later) fails:

error: failed to acquire package cache lock

Caused by:
  failed to open: /homeless-shelter/.cargo/.package-cache

Steps to reproduce

{ mozilla ? import (builtins.fetchTarball https://github.com/mozilla/nixpkgs-mozilla/archive/50bae918794d3c283aeb335b209efd71e75e3954.tar.gz)
, pkgs ?  import <nixpkgs> { overlays = [ mozilla ]; }
}:

let
  nightlyRustPlatform =
    let
      nightly = pkgs.rustChannelOf {
        date = "2019-05-08";
        channel = "nightly";
      };
    in
    pkgs.makeRustPlatform {
      rustc = nightly.rust;
      cargo = nightly.rust;
    };
in

Technical details

Please run nix-shell -p nix-info --run "nix-info -m" and paste the
results.

 - system: `"x86_64-linux"`
 - host os: `Linux 4.19.42, NixOS, 19.03.172604.7cd2e4ebe8c (Koi)`
 - multi-user?: `yes`
 - sandbox: `yes`
 - version: `nix-env (Nix) 2.2.2`
 - channels(root): `"nixos-19.03.172604.7cd2e4ebe8c,
   nixos-unstable-19.09pre179307.bc94dcf5002"`
 - channels(mw): `""`
 - nixpkgs: `/nix/var/nix/profiles/per-user/root/channels/nixos`

[layus]

Should have been fixed by https://github.com/rust-lang/cargo/pull/6940, but it seems to be only a partial fix, as /homeless-shelter/.cargo/.package-cache is still looked up.

[layus]

I have temporarilly patched the issue by adding this inside buildRustPackage.

+  preConfigure = ''
+    export HOME=`mktemp -d`
+  '';
+

If it appears that cargo will always need a HOME, and that it cannot be forced to work without it, then this patch could go inside buildRustPackage definition.

[nmattia]

Looks like a duplicate of #61192

[stale[bot]]

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