re-organize py venv and use a bazel toolchain rule to specifiy expect…

…ed py path

.bazelignore

@@ -1 +1 @@
-.direnv
+.venv

.circleci/config.yml

@@ -17,10 +17,6 @@ commands:
     steps:
       - attach_workspace:
           at: *workspace_location
-      - run:
-          name: pwd
-          command: |
-            pwd
 
   # Install python as the bazel image is used instead of python image.
   install_python:
@@ -43,11 +39,8 @@ commands:
       - run:
           name: Activate virtual environment
           command: |
-            python3.8 -m venv env --without-pip
-            source env/bin/activate
-            pwd
-            ls
-            which python3
+            python3.8 -m venv .venv --without-pip
+            source .venv/bin/activate
 
   # Initializes the CI environment by setting up common environment variables.
   init_environment:

.envrc

@@ -0,0 +1,8 @@
+# Envrionment setup for local developmeent using direnv.
+
+source secrets.rc
+
+# https://github.com/direnv/direnv/wiki/Python
+export VIRTUAL_ENV=.venv
+layout python-venv python3.8
+

.gitignore

@@ -107,14 +107,14 @@ celerybeat.pid
 
 # Environments
 .env
-.envrc
 .venv
 env/
 venv/
 ENV/
 env.bak/
 venv.bak/
 .direnv
+secrets.rc
 
 # Spyder project settings
 .spyderproject

BUILD

@@ -0,0 +1,18 @@
+load("@rules_python//python:defs.bzl", "py_runtime", "py_runtime_pair")
+
+py_runtime(
+    name = "python-3.8",
+    interpreter = ".venv/bin/python3.8",
+    python_version = "PY3",
+)
+
+py_runtime_pair(
+    name = "py_runtime_pair",
+    py3_runtime = ":python-3.8",
+)
+
+toolchain(
+    name = "py_toolchain",
+    toolchain = ":py_runtime_pair",
+    toolchain_type = "@rules_python//python:toolchain_type",
+)

WORKSPACE

@@ -44,6 +44,8 @@ http_archive(
     url = "https://github.com/dillon-giacoppo/rules_python_external/archive/v{version}.zip".format(version = rules_python_external_version),
 )
 
+register_toolchains("//:py_toolchain")
+
 load("@com_google_protobuf//:protobuf_deps.bzl", "protobuf_deps")
 
 protobuf_deps()
@@ -75,5 +77,7 @@ load("@rules_python_external//:defs.bzl", "pip_install")
 
 pip_install(
     name = "py_deps",
+    # TODO(dayfine): this should not be necesasry.
+    python_interpreter = "/usr/bin/python3.8",
     requirements = "//:requirements.txt",
 )

xlab/data/scripts/BUILD

@@ -38,4 +38,5 @@ py_binary(
         "//xlab/util/status:errors",
         requirement("absl-py"),
         requirement("protobuf"),
+    ],
 )