python-setup: Fix venv creation in Ubuntu 22.04

Fixes #1249

python-setup/install_tools.ps1

@@ -1,7 +1,11 @@
 #! /usr/bin/pwsh
 
-py -2 -m pip install --user --upgrade pip setuptools wheel
-py -3 -m pip install --user --upgrade pip setuptools wheel
+# while waiting for the next release of `virtualenv` after v20.16.5, we install an older
+# version of `setuptools` to ensure that binaries are always put under
+# `<venv-path>/bin`, which wouldn't always happen with the GitHub actions version of
+# Ubuntu 22.04. See https://github.com/github/codeql-action/issues/1249
+py -2 -m pip install --user --upgrade pip 'setuptools<60' wheel
+py -3 -m pip install --user --upgrade pip 'setuptools<60' wheel
 
 # virtualenv is a bit nicer for setting up virtual environment, since it will provide up-to-date versions of
 # pip/setuptools/wheel which basic `python3 -m venv venv` won't

python-setup/install_tools.sh

@@ -11,7 +11,13 @@ set -e
 export PATH="$HOME/.local/bin:$PATH"
 
 # Setup Python 3 dependency installation tools.
-python3 -m pip install --user --upgrade pip setuptools wheel
+
+# we install an older version of `setuptools` to ensure that binaries are always put
+# under `<venv-path>/bin`, which wouldn't always happen with the GitHub actions version
+# of Ubuntu 22.04. See https://github.com/github/codeql-action/issues/1249. The the next
+# release of `virtualenv` after v20.16.5 will include a fix for this, so we can remove
+# this bit of the logic again.
+python3 -m pip install --user --upgrade pip 'setuptools<60' wheel
 
 # virtualenv is a bit nicer for setting up virtual environment, since it will provide up-to-date versions of
 # pip/setuptools/wheel which basic `python3 -m venv venv` won't
@@ -40,7 +46,7 @@ if command -v python2 >/dev/null 2>&1; then
 		curl --location --fail https://bootstrap.pypa.io/pip/2.7/get-pip.py | python2
 	fi
 
-	python2 -m pip install --user --upgrade pip setuptools wheel
+	python2 -m pip install --user --upgrade pip 'setuptools<60' wheel
 
 	python2 -m pip install --user 'virtualenv<20.11'
 fi