Create an easy to use Docker build image

[zehnm]

The remote-os build involves a few setup steps and has many dependencies. Furthermore Linux is required, which makes it harder to use for non-Linux developers.

Goals:

• [x] "One command" build which creates a ready to use SD card image as output
• [x] Easy to switch between Git branches: build master, build dev, etc.
• [x] Option to pull latest Git sources
• [x] Parameters for common buildroot tasks: clean, defconfig, etc.
• [x] Manual mode: shell access to container
• [x] Volumes for output, Git sources, etc.
• Works on:
  • [x] Linux
  • [x] macOS Mojave (10.14)
  • [x] Windows 10

Related issues:

• 4 Document Linux development setup

• 5 Document macOS development setup

Possible implementation:

Build the SD image of the current dev branch of the remote-os Git repository:

docker run yio-remote/build remote-os dev --pull

[zehnm]

The initial version needs a rework - with 1.5 GB in size the image is too fat:

• Remove Buildroot package source downloads (saves ~ 900 MB)
• Postpone Buildroot Git submodule download
• Include Qt Linguist tools to build remote-software (adds several hundred MBs again)
• Add a new command init to prepare remote-os build

Furthermore test if it's possible to bind-mount the Git projects from the host.

[zehnm]

Ready for initial release:

• Image size is down to 466 MB
  • Projects, Buildroot and source packages are downloaded during the first build and are no longer stored in the image.
• All Qt projects are cross compiled for RPi zero with the toolchain in remote-os. I.e. remote-os must be built first. Simply execute the build command and everything is taken care for you :-)
• First initial build will take a long time (1.5 h +). This depends on internet speed, mirror state and on how powerful your PC is.
• After the initial build the remote-software or even the complete remote-os projects can be built within seconds!
• Tested on macOS, Ubuntu Linux and Windows 10
• Convenient wrapper script to start a Docker container and execute a build command: yio build

[zehnm]

Closing issue: Docker image available in dev branch