Speed up build

Makefile

@@ -1,11 +1,20 @@
+# These targets do not construct files named after the target itself. Rerun them every time.
+.PHONY: setup build test dist/main lint
+
+# This first target is the one that runs by default.
+dist/archive.tar.gz: dist/main
+	tar -czvf dist/archive.tar.gz dist/main
+
 setup:
 	./build.sh
-
+
+build: dist/main
+
 test:
 	PYTHONPATH=./src pytest
-	
-dist/archive.tar.gz:
-	tar -czvf dist/archive.tar.gz dist/main
+
+dist/main:
+	python -m PyInstaller --onefile --hidden-import="googleapiclient" --add-data="./src:src" src/main.py
 
 lint:
 	pylint --disable=C0114,E0401,E1101,C0116,W0613,R0913,C0116,R0914,C0103,W0201,W0719 src/

build.sh

@@ -1,7 +1,11 @@
 #!/usr/bin/env bash
 # setup.sh -- environment bootstrapper for python virtualenv
 
-set -euo pipefail
+# x: print out commands as they are run
+# e: exit on any failure
+# u: using a nonexistent environment variable is an error
+# o pipefail: in a pipeline, any intermediate step exiting with failure counts as an overall fail
+set -xeuo pipefail
 
 SUDO=sudo
 if ! command -v $SUDO; then
@@ -32,9 +36,7 @@ echo creating virtualenv at $VIRTUAL_ENV
 python3 -m venv $VIRTUAL_ENV
 echo installing dependencies from requirements.txt
 $VIRTUAL_ENV/bin/pip install -r requirements.txt -U
-source $VIRTUAL_ENV/bin/activate
-$PYTHON -m PyInstaller --onefile --hidden-import="googleapiclient" --add-data="./src:src"  src/main.py
+
 # When running as a local module, we need meta.json to be in the same directory as the module.
+mkdir -p dist
 ln -sf ../meta.json dist
-tar -czvf dist/archive.tar.gz dist/main
-