rustc: Add setup hook to set $CARGO_HOME

This works around 'failed to open: /homeless-shelter/.cargo/.package-cache' with Rust 1.36 even when we're using 'cargo --frozen'.
NixOS · Jul 7, 2019 · 3372343 · 3372343
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commit 3372343
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diff --git a/pkgs/development/compilers/rust/rustc.nix b/pkgs/development/compilers/rust/rustc.nix
@@ -206,6 +206,8 @@ in stdenv.mkDerivation rec {
   # https://github.com/rust-lang/rust/issues/30181
   # enableParallelBuilding = false;
 
+  setupHooks = ./setup-hook.sh;
+
   requiredSystemFeatures = [ "big-parallel" ];
 
   meta = with stdenv.lib; {

diff --git a/pkgs/development/compilers/rust/setup-hook.sh b/pkgs/development/compilers/rust/setup-hook.sh
@@ -0,0 +1,4 @@
+# Fix 'failed to open: /homeless-shelter/.cargo/.package-cache' in rust 1.36.
+if [[ -z $IN_NIX_SHELL && -z $CARGO_HOME ]]; then
+    export CARGO_HOME=$TMPDIR
+fi