Revise previous opinions about absolute paths GT <bracket-notation>

Unforeseen problem: `buildkite-agent` runs its builds in a separate directory,
so if I want the `nix-build` command to build the newly checked out code, I need
to set <briefcase> to the CWD.

3 files changed, 4 insertions, 3 deletions

diff --git a/website/sandbox/learnpianochords/shell.nix b/website/sandbox/learnpianochords/shell.nix
index 6cc05d099177..1a9c967f7fea 100644
--- a/website/sandbox/learnpianochords/shell.nix
+++ b/website/sandbox/learnpianochords/shell.nix
@@ -1,5 +1,6 @@
 let
-  pkgs = import /home/wpcarro/nixpkgs {};
+  briefcase = import <briefcase> {};
+  pkgs = briefcase.third_party.pkgs;
 in pkgs.mkShell {
   buildInputs = with pkgs; [
     elmPackages.elm
diff --git a/website/sandbox/learnpianochords/src/server/default.nix b/website/sandbox/learnpianochords/src/server/default.nix
index 6ed68d4417f4..87de69cbd627 100644
--- a/website/sandbox/learnpianochords/src/server/default.nix
+++ b/website/sandbox/learnpianochords/src/server/default.nix
@@ -1,5 +1,5 @@
 let
-  briefcase = import /home/wpcarro/briefcase {};
+  briefcase = import <briefcase> {};
 in briefcase.buildHaskell.program {
   name = "server";
   srcs = builtins.path {
diff --git a/website/sandbox/learnpianochords/src/server/shell.nix b/website/sandbox/learnpianochords/src/server/shell.nix
index a655c15871f9..ab470841e6c1 100644
--- a/website/sandbox/learnpianochords/src/server/shell.nix
+++ b/website/sandbox/learnpianochords/src/server/shell.nix
@@ -1,5 +1,5 @@
 let
-  briefcase = import /home/wpcarro/briefcase {};
+  briefcase = import <briefcase> {};
 in briefcase.buildHaskell.shell {
   deps = hpkgs: with hpkgs; [
     hspec