Add a Dockerfile for huxley tests

Summary:
Add the dockerfile that I've been using to make huxley screenshots so
others can test their changes by making huxley screenshots. Include a readme
about how to use it correctly.

Test Plan: - Use the dockerfile by running the given commands, see it works

Reviewers: alpert

Reviewed By: alpert

Differential Revision: http://phabricator.khanacademy.org/D12773

dockers/HuxleyTests/Dockerfile

@@ -0,0 +1,13 @@
+FROM ubuntu:14.04
+MAINTAINER xymostech <xymostech@gmail.com>
+RUN apt-get -qq update
+RUN apt-get -qqy install nodejs=0.10.25~dfsg2-2ubuntu1 default-jre=2:1.7-51 firefox=28.0+build2-0ubuntu2 xvfb=2:1.15.1-0ubuntu2 wget=1.15-1ubuntu1 || true
+RUN wget http://selenium-release.storage.googleapis.com/2.42/selenium-server-standalone-2.42.2.jar
+RUN ln -s /usr/bin/nodejs /usr/bin/node
+ENV DISPLAY :1
+CMD /bin/bash ~/run.sh
+RUN echo "java -jar /selenium-server-standalone-2.42.2.jar > /dev/null &" >> ~/run.sh
+RUN echo "Xvfb :1 2> /dev/null &" >> ~/run.sh
+RUN echo "make -C /KaTeX serve > /dev/null &" >> ~/run.sh
+RUN echo "sleep 2" >> ~/run.sh
+RUN echo "/KaTeX/node_modules/.bin/hux --update /KaTeX/test/huxley/" >> ~/run.sh

dockers/HuxleyTests/README.md

@@ -0,0 +1,29 @@
+### How to generate huxley images
+---------------------------------
+
+Now you too can generate huxley images from your own computer, and (hopefully)
+have them look mostly the same as the current ones! To start, make a docker
+image from the included Dockerfile using a command like
+
+    sudo docker build --tag=huxley .
+
+from within this directory (note you need to have docker installed and running
+for this to work). This will build a docker image with the huxley tag,
+which you can then use to run dockers based on them.
+
+This huxleyfile is set up such that it will run everything and generate all the
+huxley images when the image is run, so no interactive input is required. All
+that you need to do is mount the KaTeX directory you want to test into the
+`/KaTeX` directory in the docker, and run the huxley docker, like so:
+
+    sudo docker run --volume=/your/KaTeX/:/KaTeX huxley
+
+The `--volume=/your/KaTeX:/KaTeX` switch mounts your KaTeX directory into the
+docker. Note this is a read-write mounting, so the new huxley images will be
+directly placed into your KaTeX directory.
+
+Since this docker is very self-contained, there should be no need to do
+interactive management of the docker, but if you feel the need, you can read the
+General Docker Help section of the MathJaxFonts docker readme.
+
+That's it!

dockers/MathJaxFonts/README.md

@@ -1,45 +1,45 @@
 ### How to generate MathJax fonts
------------------------------
+---------------------------------
 
 It's really simple (now)! Just make a docker image from the included Dockerfile
 using a command like
 
-  sudo docker build --tag=mathjaxfonts .
+    sudo docker build --tag=mathjaxfonts .
 
 from within this directory (note you need to have docker installed and running
 for this to work). This will build a docker image with the mathjaxfonts tag,
 which you can then use to run dockers based on them. Then, run a mathjaxfonts
 docker with
 
-  sudo docker run --interactive --tty --name mjf mathjaxfonts /bin/bash
+    sudo docker run --interactive --tty --name mjf mathjaxfonts /bin/bash
 
 We name this docker "mjf" so we can reference it later when we want to copy the
 files off. (If you get an error about the name being in use, perhaps because you
 are trying to create another docker, you can either delete the old docker with
 
-  sudo docker rm mjf
+    sudo docker rm mjf
 
 or use a different name.) This will get you into the docker in the root
 directory. From there, cd into the `/MathJax-dev/fonts/OTF/TeX` directory, and
 run
 
-  make ttf eot woff
+    make ttf eot woff
 
 to build all of the fonts that we need. Finally, leave the docker and copy all
 the files off with
 
-  docker cp mjf:/MathJax-dev/fonts/OTF/TeX/ttf ./
+    docker cp mjf:/MathJax-dev/fonts/OTF/TeX/ttf ./
-  docker cp mjf:/MathJax-dev/fonts/OTF/TeX/eot ./
+    docker cp mjf:/MathJax-dev/fonts/OTF/TeX/eot ./
-  docker cp mjf:/MathJax-dev/fonts/OTF/TeX/woff ./
+    docker cp mjf:/MathJax-dev/fonts/OTF/TeX/woff ./
 
 (note we're using `mjf:` to specify the name of the docker we created above)
 Compile the fonts into a single directory
 
-  mv {ttf,eot,woff}/* ./
+    mv {ttf,eot,woff}/* ./
 
 Remove the WinIE6 and WinChrome fonts
 
-  rm KaTeX_Win*
+    rm KaTeX_Win*
 
 And you're good to go! Don't forget to update the font metrics with the
 metric_parse.rb script once you're done.
@@ -50,17 +50,17 @@ metric_parse.rb script once you're done.
 When you quit the docker, it will stop the docker from running. If you want to
 reattach to the docker, you can start it again with
 
-  sudo docker start mjf
+    sudo docker start mjf
 
 and then attach with
 
-  sudo docker attach mjf
+    sudo docker attach mjf
 
 Alternatively, if you want to detach from the docker when you're done instead of
 quitting and stopping it, you can detach with `C-p C-q`, and then re-attach with
 
-  sudo docker attach mjf
+    sudo docker attach mjf
 
 To see a list of your current dockers, you can run
 
-  docker ps
+    docker ps