Swift on Pi 3

Swift on Pi 3.md

Overview

• Using instructions from http://dev.iachieved.it/iachievedit/building-swift-3-0-on-a-raspberry-pi-3/

Install Ubuntu on microSD card

• Download image from https://wiki.ubuntu.com/ARM/RaspberryPi

• Check Disk Utility for device

• Unmount card's filesystem, if mounted

• Copy to card:

  xzcat ubuntu-16.04-preinstalled-server-armhf+raspi3.img.xz | sudo dd bs=32m of=/dev/rdiskN

• Eject card an put it in your Pi 3

Boot and update Pi 3

• Boot the pi and log in with user ubuntu, password ubuntu

• Change the ubuntu password (automatically forced on first log in).

• Reboot

• Log in remotely

  • ifconfig -a to get the eth0 address since ubuntu.local didn't work out of the box.
  • ssh ubuntu@192.168.0.120 or whatever.

• Update:

  sudo apt-get update && sudo apt-get upgrade -y reboot

• At least as of 2016-08-18, at this point the Pi 3 will have non-functioning ethernet due to https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1579969 Suggestion on Swift Pi Slack is to edit /etc/network/interfaces.d/50-cloud-ini.cfg to match the actual name.

  nano /etc/network/interfaces.d/50-cloud-ini.cfg

  perform the edits, save and exit

  reboot

• Install a mDNS server

  sudo apt-get install avahi-daemon

• Log out from the console, turn off monitor and ssh in from Mac:

  ssh ubuntu@ubuntu.local

• Install personal ssh public key (.ssh doesn't exist, ssh localhost to get it created with right permissions)

  $HOME/.ssh may not exist so use ssh to create it with correct permissions (don't actually need to complete connection)

  ssh localhost vi .ssh/authorized_keys

  Append your public key from your Mac

• Install prerequisites:

  sudo apt-get install -y git cmake ninja-build clang uuid-dev libicu-dev icu-devtools libbsd-dev libedit-dev libxml2-dev libsqlite3-dev swig libpython-dev libncurses5-dev pkg-config

• Install htop for fun monitoring builds

  sudo apt-get install htop

• Install screen to be able to disconnect from a running build:

  sudo apt-get install screen

Configure Swap Space

• Configure the swap file:

  sudo -s cd ~root fallocate -l 1G 1G.swap chmod 0600 1G.swap mkswap 1G.swap swapon 1G.swap exit

Prevent multiple concurrent invocations of the linker

• Install a helper script

  sudo -s
  nano /usr/local/bin/exec-once

  Paste in the following (w/o leading whitespace):

  #!/bin/sh

  There should be a link from a command to this script and the real command should have a ".real" suffix.

  REAL_CMD="$0.real" LOCK_DIR="$HOME/locks" LOCK_FILE="$LOCK_DIR/$(basename $0)"

  mkdir -p "$LOCK_DIR" echo "Using lock file $LOCK_FILE..."

  flock "$LOCK_FILE" "$REAL_CMD" "$@"

  ^O ^X

  chmod ugo+x /usr/local/bin/exec-once

• Set up ld.gold to use the helper script. This will break updating dev tools likely...

  mv /usr/bin/ld.gold /usr/bin/ld.gold.real ln -s /usr/local/bin/exec-once /usr/bin/ld.gold exit

Check out package-swift

• Check out and patch Swift

  git clone https://github.com/iachievedit/package-swift cd package-swift ./get.sh ./patch.sh

Manually patch

• CoreFoundation.h (two copies) contain stdio.h which produces errors on ARM. Comment them out.
  • See https://lists.swift.org/pipermail/swift-corelibs-dev/Week-of-Mon-20160815/000882.html
• Edit NSXMLNode.swift, removing UInt(bitPattern: 0xFF000000) from the preserve all option (overflows on 32 bit Int)

Build

• Build with nohup or screen:

  nohup ./package.sh > swiftbuild.log&

  or:

  screen ./package.sh |& tee swiftbuild.log

SPI support

• SPI is enabled by default in Ubuntu

  lsmod

• But, you need to run as root to access it.

Remaining

• Use external swap on USB stick again? which is faster, microSD swap or USB?

  • Probably not an issue; with exec-once wrapper Swap is barely used

• Get wireless working

  sudo apt-get install wireless-tools ... configure interface ... sudo reboot

• change host name

• enable SPI?