scripts: Add installation script for CentOS (#367)

The purpose of this PR is to add an installation script to klipper for use on Centos. Several packages names are different from debian based installs, and the system service is handled via systemd rather than LSB.

Signed-off-by: Alan Weinstock <pyroballpcs@gmail.com>

scripts/install-centos.sh

@@ -0,0 +1,101 @@
+#!/bin/bash
+# This script installs Klipper on an x86_64 machine running the
+# CentOS 7 distribution.
+
+PYTHONDIR="${HOME}/klippy-env"
+SYSTEMDDIR="/etc/systemd/system"
+
+# Step 1: Install system packages
+install_packages()
+{
+    # Packages for python cffi
+    PKGLIST="python-virtualenv libffi-devel"
+    # kconfig requirements
+    PKGLIST="${PKGLIST} ncurses-devel"
+    # hub-ctrl
+    PKGLIST="${PKGLIST} libusb-devel"
+    # AVR chip installation and building
+    PKGLIST="${PKGLIST} avrdude gcc-avr32-linux-gnu binutils-avr32-linux-gnu avr-libc"
+    # ARM chip installation and building
+    # CentOS/Fedora do not appear to have these packages available at this time
+    PKGLIST="${PKGLIST} arm-none-eabi-gcc-cs arm-none-eabi-newlib"
+
+    # Install desired packages
+    report_status "Installing packages..."
+    sudo yum install -y ${PKGLIST}
+}
+
+# Step 2: Create python virtual environment
+create_virtualenv()
+{
+    report_status "Updating python virtual environment..."
+
+    # Create virtualenv if it doesn't already exist
+    [ ! -d ${PYTHONDIR} ] && virtualenv ${PYTHONDIR}
+
+    # Install/update dependencies
+    ${PYTHONDIR}/bin/pip install cffi==1.6.0 pyserial==3.2.1 greenlet==0.4.10
+}
+
+# Step 3: Install startup script
+install_script()
+{
+# Create systemd service file
+    report_status "Installing system start script..."
+    sudo /bin/sh -c "cat > $SYSTEMDDIR/klipper.service" << EOF
+#Systemd service file for klipper
+[Unit]
+Description=Starts klipper on startup
+After=network.target
+
+[Install]
+WantedBy=multi-user.target
+
+[Service]
+Type=simple
+User=$USER
+RemainAfterExit=yes
+ExecStart=${PYTHONDIR}/bin/python ${SRCDIR}/klippy/klippy.py ${HOME}/printer.cfg -l /var/log/klippy.log
+EOF
+# Use systemctl to enable the klipper systemd service script
+    sudo systemctl enable klipper.service
+}
+
+# Configuration for systemctl klipper
+
+KLIPPY_USER=$USER
+
+
+# Step 5: Start host software
+start_software()
+{
+    report_status "Launching Klipper host software..."
+    sudo systemctl klipper restart
+}
+
+# Helper functions
+report_status()
+{
+    echo -e "\n\n###### $1"
+}
+
+verify_ready()
+{
+    if [ "$EUID" -eq 0 ]; then
+        echo "This script must not run as root"
+        exit -1
+    fi
+}
+
+# Force script to exit if an error occurs
+set -e
+
+# Find SRCDIR from the pathname of this script
+SRCDIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )"/.. && pwd )"
+
+# Run installation steps defined above
+verify_ready
+install_packages
+create_virtualenv
+install_script
+start_software