New upgrade script for Python.

docs/python.md

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+## Description
+This script will upgrade Python to the latest stable version.
+It will also create a new virtual environment to be used for Home Assistant.
+
+## Upgrade
+```
+$ sudo hassbian-config upgrade python
+```
+
+## Additional info
+If you have installed additional components directly to `/srv/homeassistant/` like `libcec` thoese will need to be reinstalled.
+
+***
+This script was originally contributed by [@Ludeeus](https://github.com/ludeeus).
+With inspiration from: [blog.ceard.tech](https://blog.ceard.tech/2017/12/upgrading-python-virtual-environment.html)

package/opt/hassbian/suites/python.sh

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+#!/bin/bash
+
+function python-show-short-info {
+  echo "Upgrades python3 and virtual environment to the newest version."
+}
+
+function python-show-long-info {
+  echo "Upgrades python3 and virtual environment to the newest version."
+}
+
+function python-show-copyright-info {
+  echo "This script was originally contributed by Ludeeus <https://github.com/ludeeus>."
+}
+
+function python-upgrade-package {
+python-show-short-info
+python-show-copyright-info
+PYTHONVERSION=$(curl -s https://www.python.org/downloads/source/ | grep "Latest Python 3 Release" | cut -d "<" -f 3 | awk -F ' ' '{print $NF}')
+
+echo "Installing Python $PYTHONVERSION"
+apt-get -y update
+apt-get install -y build-essential tk-dev libncurses5-dev libncursesw5-dev libreadline6-dev libdb5.3-dev libgdbm-dev libsqlite3-dev libssl-dev libbz2-dev libexpat1-dev liblzma-dev zlib1g-dev
+apt-get install libtcmalloc-minimal4
+export LD_PRELOAD="/usr/lib/libtcmalloc_minimal.so.4"
+cd /tmp
+wget https://www.python.org/ftp/python/"$PYTHONVERSION"/Python-"$PYTHONVERSION".tar.xz
+tar xf Python-"$PYTHONVERSION".tar.xz
+cd Python-"$PYTHONVERSION"
+./configure --enable-optimizations
+make
+apt -y autoremove
+rm -r /tmp/Python-"$PYTHONVERSION"
+rm /tmp/Python-"$PYTHONVERSION".tar.xz
+echo "Done"
+
+echo "Stopping Home Assistant."
+systemctl stop home-assistant@homeassistant.service
+
+echo "Backing up previous virutal enviorment."
+mv /srv/homeassistant /srv/homeassistant_old
+sudo -u homeassistant -H /bin/bash << EOF
+source /srv/homeassistant/bin/activate
+pip3 freeze —local > /tmp/requirements.txt
+deactivate
+EOF
+
+echo "Creating new virutal enviorment using Python $PYTHONVERSION"
+python3.6 -m venv /srv/homeassistant
+sudo chown homeassistant:homeassistant /srv/homeassistant
+sudo mv /srv/homeassistant_old/hassbian /srv/homeassistant/hassbian
+sudo apt-get install python3-pip python3-dev
+sudo pip3 install --upgrade virtualenv
+sudo -u homeassistant -H /bin/bash << EOF
+source /srv/homeassistant/bin/activate
+pip3 install -r /tmp/requirements.txt
+pip3 install --upgrade homeassistant
+deactivate
+EOF
+mv /home/homeassistant/.homeassistant/deps /home/homeassistant/.homeassistant/deps_old
+
+echo "Starting Home Assistant."
+sudo curl -o /etc/systemd/system/home-assistant@homeassistant.service https://raw.githubusercontent.com/home-assistant/hassbian-scripts/dev/package/etc/systemd/system/home-assistant%40homeassistant.service
+sudo systemctl enable home-assistant@homeassistant.service
+sudo systemctl daemon-reload
+sudo systemctl start home-assistant@homeassistant.service
+
+echo "Checking the installation..."
+validation=$(sudo -u homeassistant -H /bin/bash << EOF | grep Version | awk '{print $2}'
+source /srv/homeassistant/bin/activate
+python -V
+EOF
+)
+if [ "$validation" == "Python $PYTHONVERSION" ]; then
+  echo
+  echo -e "\\e[3231mUpgrade done..\\e[0m"
+  echo
+else
+  echo
+  echo -e "\\e[31mUpgrade failed..."
+  echo -e "\\e[31mReverting..."
+  echo -e "\\e[0mIf you have issues with this script, please say something in the #devs_hassbian channel on Discord."
+  echo
+  return 1
+fi
+return 0
+}
+
+[[ "$_" == "$0" ]] && echo "hassbian-config helper script; do not run directly, use hassbian-config instead"