Futzing with toolchains

WORKSPACE

@@ -35,7 +35,6 @@ bazel_skylib_workspace()
 ####################################################################################################
 # Python support
 ####################################################################################################
-register_toolchains("//tools/python:toolchain")
 
 # Using rules_python at a more recent SHA than the last release like a baws
 git_repository(
@@ -45,6 +44,8 @@ git_repository(
     # commit = "...",
 )
 
+register_toolchains("//tools/python:python3_toolchain")
+
 # pip package pinnings need to be initialized.
 # this generates a bunch of bzl rules so that each pip dep is a bzl target
 load("@rules_python//python:pip.bzl", "pip_install")
@@ -52,6 +53,7 @@ load("@rules_python//python:pip.bzl", "pip_install")
 pip_install(
     name = "arrdem_source_pypi",
     requirements = "//tools/python:requirements.txt",
+    python_interpreter = "/usr/bin/python3.9",
 )
 
 # git_repository(

tools/python/BUILD

@@ -13,7 +13,7 @@ exports_files([
 ])
 
 py_runtime(
-    name = "python_runtime",
+    name = "python3_runtime",
     files = [],
     interpreter_path = "/usr/bin/python3.9",
     python_version = "PY3",
@@ -21,14 +21,14 @@ py_runtime(
 )
 
 py_runtime_pair(
-    name = "runtime",
+    name = "python_runtime",
     py2_runtime = None,
-    py3_runtime = ":python_runtime",
+    py3_runtime = ":python3_runtime",
 )
 
 toolchain(
-    name = "toolchain",
-    toolchain = ":runtime",
+    name = "python3_toolchain",
+    toolchain = ":python_runtime",
     toolchain_type = "@bazel_tools//tools/python:toolchain_type",
 )