Merge 1746e4f5ec into 07479c2e73

As opposed to e.g. Nix 2.18, Nix 2.3 doesn't try to create a fallback
store in $HOME if $NIX_STORE_DIR and $NIX_STATE_DIR aren't writable.

README.md

@@ -205,7 +205,7 @@ You can run the CLI tool ad-hoc without installing it:
 nix run github:ryantm/agenix -- --help
 ```
 
-But you can also add it permanently into a [NixOS module](https://nixos.wiki/wiki/NixOS_modules) 
+But you can also add it permanently into a [NixOS module](https://wiki.nixos.org/wiki/NixOS_modules)
 (replace system "x86_64-linux" with your system):
 
 ```nix

pkgs/agenix.nix

@@ -30,9 +30,13 @@ in
       shellcheck ${bin}
       ${bin} -h | grep ${version}
 
-      HOME=$(mktemp -d 2>/dev/null || mktemp -d -t 'mytmpdir')
+      test_tmp=$(mktemp -d 2>/dev/null || mktemp -d -t 'mytmpdir')
+      export HOME="$test_tmp/home"
+      export NIX_STORE_DIR="$test_tmp/nix/store"
+      export NIX_STATE_DIR="$test_tmp/nix/var"
+      mkdir -p "$HOME" "$NIX_STORE_DIR" "$NIX_STATE_DIR"
       function cleanup {
-        rm -rf $HOME
+        rm -rf "$test_tmp"
       }
       trap "cleanup" 0 2 3 15