PYTHON-4706 Allow running pytest directly without hatch (#1824)

.evergreen/config.yml

@@ -410,6 +410,7 @@ functions:
             SSL=${SSL} \
             TEST_DATA_LAKE=${TEST_DATA_LAKE} \
             MONGODB_API_VERSION=${MONGODB_API_VERSION} \
+            SKIP_HATCH=${SKIP_HATCH} \
             bash ${PROJECT_DIRECTORY}/.evergreen/hatch.sh test:test-eg
 
   "run enterprise auth tests":
@@ -561,7 +562,9 @@ functions:
         working_dir: "src"
         script: |
           . .evergreen/scripts/env.sh
-          . .evergreen/hatch.sh encryption:teardown
+          if [ -f $DRIVERS_TOOLS/.evergreen/csfle/secrets-export.sh ]; then
+            . .evergreen/hatch.sh encryption:teardown
+          fi
           rm -rf ${DRIVERS_TOOLS} || true
           rm -f ./secrets-export.sh || true
 
@@ -2083,10 +2086,14 @@ axes:
         display_name: "RHEL 8.3 (zSeries)"
         run_on: rhel83-zseries-small
         batchtime: 10080  # 7 days
+        variables:
+          SKIP_HATCH: true
       - id: rhel81-power8
         display_name: "RHEL 8.1 (POWER8)"
         run_on: rhel81-power8-small
         batchtime: 10080  # 7 days
+        variables:
+          SKIP_HATCH: true
       - id: rhel82-arm64
         display_name: "RHEL 8.2 (ARM64)"
         run_on: rhel82-arm64-small

.evergreen/hatch.sh

@@ -8,7 +8,17 @@ if [ -z "$PYTHON_BINARY" ]; then
     PYTHON_BINARY=$(find_python3)
 fi
 
-if $PYTHON_BINARY -m hatch --version; then
+# Check if we should skip hatch and run the tests directly.
+if [ -n "$SKIP_HATCH" ]; then
+    ENV_NAME=testenv-$RANDOM
+    createvirtualenv "$PYTHON_BINARY" $ENV_NAME
+    # shellcheck disable=SC2064
+    trap "deactivate; rm -rf $ENV_NAME" EXIT HUP
+    python -m pip install -e ".[test]"
+    run_hatch() {
+      bash ./.evergreen/run-tests.sh
+    }
+elif $PYTHON_BINARY -m hatch --version; then
     run_hatch() {
       $PYTHON_BINARY -m hatch run "$@"
     }