tests: better simulate BCR environment

Author: rickeylev

.bazelci/isolate.sh

@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+MODULE_DIR="${1:-}"
+
+if [[ -z "${MODULE_DIR}" ]]; then
+  echo "Usage: $0 <module_directory>"
+  exit 1
+fi
+
+# Find the repository root assuming this script is in .bazelci/
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+REPO_ROOT="$(dirname "$SCRIPT_DIR")"
+
+cd "${REPO_ROOT}"
+
+echo "Removing files outside of ${MODULE_DIR} to simulate BCR environment..."
+find . -maxdepth 1 -mindepth 1 \
+  ! -name "${MODULE_DIR}" \
+  ! -name ".git" \
+  ! -name ".bazelci" \
+  -exec rm -rf '{}' +

.bazelci/presubmit.yml

@@ -100,6 +100,7 @@ buildifier:
     bazel: ${{ bazel }}
     working_directory: gazelle/examples/bzlmod_build_file_generation
     shell_commands:
+      - "../../../.bazelci/isolate.sh gazelle"
       - "echo 'common --override_module=rules_python=' >> .bazelrc"
       - "bazel run //:gazelle_python_manifest.update"
       - "bazel run //:gazelle -- update"
@@ -159,19 +160,25 @@ tasks:
     <<: *minimum_supported_version
     name: "Gazelle: workspace, minimum supported Bazel version"
     platform: ubuntu2204
+    shell_commands:
+      - "../.bazelci/isolate.sh gazelle"
     build_targets: ["//..."]
     test_targets: ["//..."]
     working_directory: gazelle
   gazelle_extension_workspace:
     <<: *common_workspace_flags
     name: "Gazelle: workspace"
     platform: ubuntu2204
+    shell_commands:
+      - "../.bazelci/isolate.sh gazelle"
     build_targets: ["//..."]
     test_targets: ["//..."]
     working_directory: gazelle
   gazelle_extension:
     name: "Gazelle: default settings"
     platform: ubuntu2204
+    shell_commands:
+      - "../.bazelci/isolate.sh gazelle"
     build_targets: ["//..."]
     test_targets: ["//..."]
     working_directory: gazelle
@@ -180,6 +187,8 @@ tasks:
     name: "Sphinxdocs: Ubuntu"
     working_directory: "sphinxdocs"
     platform: ubuntu2204
+    shell_commands:
+      - "../.bazelci/isolate.sh sphinxdocs"
     build_targets:
       - "//..."
     test_targets:
@@ -188,6 +197,8 @@ tasks:
     name: "Sphinxdocs: Mac"
     working_directory: "sphinxdocs"
     platform: macos_arm64
+    shell_commands:
+      - "../.bazelci/isolate.sh sphinxdocs"
     build_targets:
       - "//..."
     test_targets: