fix: bun_install adds node_modules to each directory

tests/install_test/BUILD.bazel

@@ -77,6 +77,13 @@ sh_test(
     data = ["//internal:bun_install.bzl"],
 )
 
+sh_test(
+    name = "bun_install_environment_shape_test",
+    srcs = ["environment_shape.sh"],
+    args = ["$(location //internal:bun_install.bzl)"],
+    data = ["//internal:bun_install.bzl"],
+)
+
 sh_test(
     name = "bun_install_workspaces_test",
     srcs = ["workspaces.sh"],

tests/install_test/determinism.sh

@@ -4,7 +4,7 @@ set -euo pipefail
 rule_file="$1"
 
 grep -Eq 'install", "--frozen-lockfile", "--no-progress"' "${rule_file}"
-grep -Eq 'repository_ctx\.symlink\(package_json, "package\.json"\)' "${rule_file}"
+grep -Eq 'repository_ctx\.file\("package\.json", repository_ctx\.read\(package_json\)\)' "${rule_file}"
 grep -Eq 'lockfile_name = bun_lockfile\.basename' "${rule_file}"
 grep -Eq 'if lockfile_name not in \["bun\.lock", "bun\.lockb"\]:' "${rule_file}"
 grep -Eq 'repository_ctx\.symlink\(bun_lockfile, lockfile_name\)' "${rule_file}"

tests/install_test/environment_shape.sh

@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+rule_file="$1"
+
+grep -Eq '\[str\(bun_bin\), "--bun", "install", "--frozen-lockfile", "--no-progress"\]' "${rule_file}"
+grep -Eq 'environment[[:space:]]*=[[:space:]]*\{"HOME":[[:space:]]*str\(repository_ctx\.path\("\."\)\)\}' "${rule_file}"