#+TITLE: spacemacs-docker distribution

#+TAGS: distribution|layer|spacemacs

* Table of Contents                     :TOC_5_gh:noexport:
- [[#description][Description]]
  - [[#features][Features:]]
- [[#screenshots][Screenshots]]
- [[#how-to-setup][How to setup]]
- [[#how-to-use][How to use]]
  - [[#macos][macOS]]
  - [[#windows][Windows]]
  - [[#gnulinux][GNU/Linux]]
  - [[#with-xpra-on-any-of-the-oses-and-via-web-browser][With Xpra on any of the OSes and via web-browser]]
    - [[#pros][Pros]]
    - [[#cons][Cons]]
    - [[#instruction][Instruction]]
      - [[#with-xpra-desktop-client][With Xpra desktop client]]
      - [[#via-web-browser][Via web-browser]]
- [[#some-basic-docker-commands-to-get-you-going][Some basic docker commands to get you going]]

* Description
Spacemacs distribution that aims to automate dependency installation for
Spacemacs layers and provide well tested Docker based development environment
with GUI support on all major platforms and even [[https://i.imgur.com/wDLDMZN.gif][your web browser]].

** Features:
- Automatically get Spacemacs layers dependency installed with [[https://github.com/syl20bnr/spacemacs/blob/develop/layers/%2Bdistributions/spacemacs-docker/deps-install/README.org][installer scripts]]
- Reap the benefit of Emacs and other GNU/Linux tools on Windows or macOS machines
- Use [[https://hub.docker.com/][docker hub]] to auto-build your environment and store full backups for free
- Build once and work with the same development environment everywhere
- Run untrusted/risky code in the tunable sandbox with CPU/network/disk quotas
- Try new tools, experiment and roll back changes when something goes wrong
- Share your setup with others or extend someone else's development environment
- Run multiple Emacs instances on the same machine isolated
- [[https://docs.docker.com/engine/reference/commandline/pause/][pause]] container to free resources temporarily
- [[https://github.com/docker/docker/blob/1.13.x/experimental/checkpoint-restore.md][Checkpoint & Restore]] - maybe the fastest way to start a "heavy" environment
- Friendly for networks with low upload speed/quotas.

* Screenshots
[[file:img/MAC_SP.jpg]]

[[https://i.imgur.com/VcuqReF.jpg][HD macOS image]]

[[file:img/LN_SP.jpg]]

[[https://i.imgur.com/yDok0Q7.jpg][HD GNU/Linux image]]

[[file:img/WIN_SP.jpg]]

[[https://i.imgur.com/WmsnCUo.jpg][HD Windows image]]

* How to setup
The idea is to build your own image [[https://docs.docker.com/engine/reference/builder/#from][FROM]] the one of provided base images.
Get [[https://docs.docker.com/engine/installation][docker]] for the OS of
the machine that will run development environment and then use
[[https://github.com/JAremko/spacemacs-docker-seed][spacemacs-docker-seed]] as an example to create [[https://docs.docker.com/docker-hub/builds/][automated builds on Docker Hub]] or
[[https://docs.docker.com/engine/reference/commandline/build/][build it locally]].

* How to use
With one of the methods below replace =spacemacs/develop= with your images.
NOTE: The guide assumes that you want to run Docker and connect to it from
the same machine.

** macOS
Get [[https://www.xquartz.org][XQuartz]] and =open -a XQuartz= In the XQuartz preferences go to the "Security"
tab and make sure you've got "Allow connections from network clients" ticked

#+BEGIN_SRC sh
  ip=$(ifconfig en0 | grep inet | awk '$1=="inet" {print $2}')
  xhost + $ip
  docker run -ti --name spacemacs \
   -e DISPLAY=$ip:0 \
   -e TZ=<your_time_zone> \
   -v <path_to_your_workspace>:/mnt/workspace \
   spacemacs/develop
#+END_SRC

[[https://fredrikaverpil.github.io/2016/07/31/docker-for-mac-and-gui-applications][source]],
[[https://github.com/chanezon/docker-tips/blob/master/x11/README.md][another method]]

** Windows
Get [[https://www.cygwin.com][Cygwin]] with =xinit=, =xorg-server= and optionaly [[https://github.com/rprichard/winpty][winpty]] (to run Emacs container with =-t=)

#+BEGIN_SRC sh
  export DISPLAY=<your-machine-ip>:0.0
  startxwin -- -listen tcp &
  xhost + <your-machine-ip>
#+END_SRC

#+BEGIN_SRC sh
  docker run --name spacemacs \
   -e DISPLAY="$DISPLAY" \
   -v <path_to_your_workspace>:/mnt/workspace \
   spacemacs/develop
#+END_SRC

Or with =-ti= via =winpty=

#+BEGIN_SRC sh
  winpty docker run -ti --name spacemacs \
   -e DISPLAY="$DISPLAY" \
   -v <path_to_your_workspace>:/mnt/workspace \
   spacemacs/develop
#+END_SRC

[[http://manomarks.github.io/2015/12/03/docker-gui-windows.html][source]]
Also You can use [[https://www.reddit.com/r/emacs/comments/7a63r4/emacs_in_win10linuxdockerxserver_combo/][@ninrod 's setup]]

** GNU/Linux
Make sure that =$DISPLAY= variable is set

#+BEGIN_SRC sh
  docker run -ti --name spacemacs \
   -e DISPLAY="unix$DISPLAY" \
   -e UNAME="spacemacser" \
   -e UID="1000" \
   -e TZ=<your_time_zone> \
   -v /tmp/.X11-unix:/tmp/.X11-unix:ro \
   -v /etc/localtime:/etc/localtime:ro \
   -v /etc/machine-id:/etc/machine-id:ro \
   -v /var/run/dbus:/var/run/dbus \
   -v <path_to_your_workspace>:/mnt/workspace \
   spacemacs/develop
#+END_SRC

=UID= and preferably =UNAME= should match the host's user id. You can set them
in your Dockerfile with [[https://docs.docker.com/engine/reference/builder/#env][ENV statements]].
That's it! Now you should see Emacs window.
But if it doesn't work You may need to allow local connection for the user

#+BEGIN_SRC sh
  xhost +si:localuser:<UNAME>
#+END_SRC

Or allow local connection from the container's host-name

#+BEGIN_SRC sh
  xhost +local:`docker inspect --format='{{ .Config.Hostname }}' spacemacs`
#+END_SRC

[[http://stackoverflow.com/questions/25281992/alternatives-to-ssh-x11-forwarding-for-docker-containers][source]]

** With Xpra on any of the OSes and via web-browser
*** Pros
- Xpra has a client for GNU/Linux, Windows and macOS + can work via web browser
- Persistent server (you can connect and disconnect without disrupting Emacs)
- Interactive screen sharing [[https://imgur.com/ijdSuX6][demo]]
- Read/write rss/email with Emacs in web-browser (O_O) [[https://imgur.com/wDLDMZN][demo]]

*** Cons
- Lag spikes with some OSes

*** Instruction
It's a good idea to read [[https://github.com/JAremko/docker-x11-bridge][docker-x11-bridge]] and [[https://www.xpra.org/trac/][Xpra]] documentations, but
here is a short instruction:

**** With Xpra desktop client
Get [[https://xpra.org/][Xpra]] client for your OS. then

#+BEGIN_SRC sh
  docker run -ti --rm --name x11-bridge \
   -e MODE="ssh" \
   --net=host \
   -v ~/.ssh/pub_rsa:/etc/pub-keys/me.pub \
   -e DISPLAY=:14 \
   jare/x11-bridge

  docker run -ti --rm --name spacemacs \
   --volumes-from x11-bridge \
   -e DISPLAY=:14 \
   -e TZ=<your_time_zone> \
   spacemacs/develop
#+END_SRC

Now you can connect to it with Xpra desktop client

#+BEGIN_SRC sh
  <XPRA EXECUTABLE> attach --encoding=rgb \
   --ssh="ssh -o StrictHostKeyChecking=no -p 22" \
   ssh:xpra@localhost:14
#+END_SRC

**** Via web-browser
#+BEGIN_SRC sh
  docker run -ti --rm --name x11-bridge \
   -e MODE="html" \
   --net=host \
   -e XPRA_PASSWORD=<PASSWORD> \
   -e DISPLAY=:14 \
   jare/x11-bridge

  docker run -ti --rm --name spacemacs \
   --volumes-from x11-bridge \
   -e TZ=<your_time_zone> \
   -e DISPLAY=:14 \
   spacemacs/develop
#+END_SRC

Now visit [[http://localhost:10000/index.html?encoding=png&password]] =<PASSWORD>

* Some basic docker commands to get you going
- =docker rm -f spacemacs= - remove =spacemacs= container
- =docker restart spacemacs= - restart =spacemacs= container
- =docker rmi -f spacemacs/develop= - remove =spacemacs/develop= image
- =docker pull spacemacs/develop= - get newer =spacemacs/develop= version
- =docker images -a= - list all images
- =docker ps -a= - list all containers
- =docker run ... spacemacs/develop= - run default cmd
- =docker run -ti ... spacemacs/develop /bin/bash= - start bash
- =docker run --network=host ...= - less overhead and no need to map ports
- =docker exec spacemacs /usr/bin/emacs= - start =/usr/bin/emacs=

With the running =spacemacs= container
- =docker logs spacemacs= - print =spacemacs= container's logs
- =docker cp <from_local_path> spacemacs:/<to_my_spacemacs_container_path>=
- =docker cp spacemacs:/<from_my_spacemacs_container_path> <to_local_path>=
- Manage data in containers with [[https://docs.docker.com/engine/tutorials/dockervolumes/][Docker volumes]]. Example
  - =docker volume create --name my-ws=
  - =docker run ... -v my-ws:/mnt/workspace ... spacemacs/develop=
  - =docker run ... -v my-ws:/home/developer/workspace ... jare/vim-bundle=