Remove conditionality on PY variable from project bootstrap code.

Makefile

@@ -10,8 +10,6 @@ LOCAL_PYTHON_BIN = './envhelp/lpython'
 
 ifdef PYTHON_BIN
 	LOCAL_PYTHON_BIN = $(PYTHON_BIN)
-else ifeq ($(PY),2)
-	PYTHON_BIN = './envhelp/python2'
 else
 	PYTHON_BIN = './envhelp/python3'
 endif
@@ -28,7 +26,7 @@ info:
 	@echo "The following should help you get started:"
 	@echo
 	@echo "'make test'      - run the test suite (default python 3)"
-	@echo "'make PY=2 test' - run the test suite (default python 2)"
+	@echo "'make PYVER=X.Y' - run the test suite (python version X.Y)"
 	@echo "'make unittest'  - execute tests locally for development"
 
 .PHONY: fmt
@@ -41,7 +39,6 @@ endif
 
 .PHONY: clean
 clean:
-	@rm -f ./envhelp/py2.imageid
 	@rm -f ./envhelp/py3.imageid
 	@rm -f ./envhelp/local.depends
 
@@ -61,11 +58,7 @@ unittest: dependencies testconfig
 	@$(LOCAL_PYTHON_BIN) -m unittest discover -s tests/
 
 .PHONY: dependencies
-ifeq ($(PY),2)
-dependencies: ./envhelp/local.depends
-else
 dependencies: ./envhelp/venv/pyvenv.cfg ./envhelp/local.depends
-endif
 
 .PHONY: testconfig
 testconfig: ./envhelp/output/testconfs

envhelp/dpython

@@ -31,26 +31,24 @@ SCRIPT_PATH=$(realpath "$0")
 SCRIPT_BASE=$(dirname -- "$SCRIPT_PATH")
 MIG_BASE=$(realpath "$SCRIPT_BASE/..")
 
-if [ -n "${PY}" ]; then
-    PYVER="$PY"
-    PYTHON_SUFFIX="py$PY"
-    DOCKER_FILE_SUFFIX="$PYTHON_SUFFIX"
-elif [ -n "${PYVER}" ]; then
-    PY=3
+if [ -n "${PYVER}" ]; then
     PYTHON_SUFFIX="pyver_$PYVER"
     DOCKER_FILE_SUFFIX="pyver"
 else
-    echo "No python version specified - please supply a PY env var"
-    exit 1
+    echo "No specific python version chosen - defaulting to supported baseline"
+    PYVER="3 (default)"
+    PYTHON_SUFFIX="py3"
+    DOCKER_FILE_SUFFIX="py3"
 fi
 
 DOCKER_FILE="$SCRIPT_BASE/docker/Dockerfile.$DOCKER_FILE_SUFFIX"
 DOCKER_IMAGEID_FILE="$SCRIPT_BASE/$PYTHON_SUFFIX.imageid"
+DOCKER_PYTHON_BIN=${DOCKER_PYTHON_BIN:-"python3"}
 
 # NOTE: portable dynamic lookup with docker as default and fallback to podman
 DOCKER_BIN=$(command -v docker || command -v podman || echo "")
 if [ -z "${DOCKER_BIN}" ]; then
-    echo "No docker binary found - cannot use for python $PY tests"
+    echo "No docker binary found - cannot use for python $PYVER tests"
     exit 1
 fi
 
@@ -66,7 +64,7 @@ MIG_ENV=${MIG_ENV:-'docker'}
 PYTHONPYCACHEPREFIX="$PYTHONPATH/envhelp/output/__pycache.${PYTHON_SUFFIX}__"
 
 # determine if the image has changed
-echo -n "validating python $PY container.. "
+echo -n "validating python $PYVER container.. "
 
 # load a previously written docker image id if present
 IMAGEID_STORED=$(cat "$DOCKER_IMAGEID_FILE" 2>/dev/null || echo "")
@@ -90,4 +88,4 @@ ${DOCKER_BIN} run -it --rm \
     --env "PYTHONPATH=$PYTHONPATH" \
     --env "PYTHONPYCACHEPREFIX=$PYTHONPYCACHEPREFIX" \
     --env "MIG_ENV=$MIG_ENV" \
-    "$IMAGEID" python$PY $@
+    "$IMAGEID" "$DOCKER_PYTHON_BIN" $@

envhelp/makeconfig

@@ -31,12 +31,11 @@ SCRIPT_PATH=$(realpath "$0")
 SCRIPT_BASE=$(dirname -- "$SCRIPT_PATH")
 MIG_BASE=$(realpath "$SCRIPT_BASE/..")
 PYTHON_BIN=${PYTHON_BIN:-"$SCRIPT_BASE/venv/bin/python3"}
-PY=${PY:-'3'}
 
 # default PYTHONPATH such that importing files in the repo "just works"
 PYTHONPATH=${PYTHONPATH:-"$MIG_BASE"}
 
 # default any variables for local development
 MIG_ENV=${MIG_ENV:-'local'}
 
-MIG_ENV="$MIG_ENV" PY="$PY" "$PYTHON_BIN" "$SCRIPT_BASE/makeconfig.py" "$@"
+MIG_ENV="$MIG_ENV" "$PYTHON_BIN" "$SCRIPT_BASE/makeconfig.py" "$@"

envhelp/python3

@@ -30,4 +30,4 @@ set -e
 SCRIPT_PATH=$(realpath "$0")
 SCRIPT_BASE=$(dirname -- "$SCRIPT_PATH")
 
-PY=3 $SCRIPT_BASE/dpython "$@"
+$SCRIPT_BASE/dpython "$@"