build py3.9 on buster

scripts/_common.sh

@@ -5,14 +5,99 @@
 #=================================================
 
 # dependencies used by the app (must be on a single line)
-pkg_dependencies="git curl python3 python3-pip python3-venv libpq-dev postgresql libsasl2-dev python3-dev libldap2-dev libssl-dev"
+pkg_dependencies="git curl python3 python3-pip python3-venv libpq-dev postgresql libsasl2-dev python3-dev libldap2-dev libssl-dev libffi-dev autoconf build-essential"
 
 nodejs_version=16
+py_required_version=3.9.2
 
 #=================================================
 # PERSONAL HELPERS
 #=================================================
 
+# Install specific python version
+# usage: myynh_install_python --python="3.8.6"
+# | arg: -p, --python=    - the python version to install
+myynh_install_python () {
+	# Declare an array to define the options of this helper.
+	local legacy_args=u
+	local -A args_array=( [p]=python= )
+	local python
+	# Manage arguments with getopts
+	ynh_handle_getopts_args "$@"
+	
+	# Check python version from APT
+	local py_apt_version=$(python3 --version | cut -d ' ' -f 2)
+	
+	# Check existing built version of python in /usr/local/bin
+	if [ -e "/usr/local/bin/python${python:0:3}" ]
+	then
+		local py_built_version=$(/usr/local/bin/python${python:0:3} --version \
+			| cut -d ' ' -f 2)
+	else
+		local py_built_version=0
+	fi
+	
+	# Compare version
+	if $(dpkg --compare-versions $py_apt_version ge $python)
+	then
+		# APT >= Required
+		ynh_print_info --message="Using provided python3..."
+		
+		py_app_version="python3"
+		
+	else
+		# Either python already built or to build 
+		if $(dpkg --compare-versions $py_built_version ge $python)
+		then
+			# Built >= Required
+			ynh_print_info --message="Using already used python3 built version..."
+			
+			py_app_version="/usr/local/bin/python${py_built_version:0:3}"
+			
+		else
+			ynh_print_info --message="Installing additional dependencies to build python..."
+			
+			pkg_dependencies="${pkg_dependencies} tk-dev libncurses5-dev libncursesw5-dev libreadline6-dev libdb5.3-dev libgdbm-dev libsqlite3-dev libbz2-dev libexpat1-dev liblzma-dev wget tar"
+			ynh_install_app_dependencies "${pkg_dependencies}"
+			
+			# APT < Minimal & Actual < Minimal => Build & install Python into /usr/local/bin
+			ynh_print_info --message="Building python (may take a while)..."
+			
+			# Store current direcotry 
+			local MY_DIR=$(pwd)
+			
+			# Create a temp direcotry
+			tmpdir="$(mktemp --directory)"
+			cd "$tmpdir"
+			
+			# Download
+			wget --output-document="Python-$python.tar.xz" \
+				"https://www.python.org/ftp/python/$python/Python-$python.tar.xz" 2>&1
+			
+			# Extract
+			tar xf "Python-$python.tar.xz"
+			
+			# Install
+			cd "Python-$python"
+			./configure --enable-optimizations
+			ynh_exec_warn_less make -j4
+			ynh_exec_warn_less make altinstall
+			
+			# Go back to working directory
+			cd "$MY_DIR"
+			
+			# Clean
+			ynh_secure_remove "$tmpdir"
+			
+			# Set version
+			py_app_version="/usr/local/bin/python${python:0:3}"
+		fi
+	fi
+	# Save python version in settings 
+	ynh_app_setting_set --app=$app --key=python --value="$python"
+}
+
+
 #=================================================
 # EXPERIMENTAL HELPERS
 #=================================================

scripts/install

@@ -136,7 +136,13 @@ chown $app:$app "$final_path/.env"
 #=================================================
 ynh_script_progression --message="Setting up Tandoor venv..." --weight=1
 
-ynh_exec_as $app python3 -m venv "$final_path/venv"
+if [[ $(ynh_get_debian_release) == "bullseye" ]]; then
+	py_app_version="python3"
+else
+	myynh_install_python --python="$py_required_version"
+fi
+
+ynh_exec_as $app $py_app_version -m venv "$final_path/venv"
 
 ynh_script_progression --message="Installing dependencies via pip..." --weight=4
 pushd "$final_path"