daniel-barlow

#include <stdio.h>

int main(int argvc, char * argv)
{
  printf("hello world\n");
  return 0;
}

daniel-barlow

As a developer
I want to get better at making my PRs easier to review
So that they get reviewed sooner and I can merge faster => shorter cycle times

As a code reviewer
I want PRs that are easier to review
So that it's less work

daniel-barlow

import qualified Data.Map as Map
import qualified Data.List as List

-- Getting started
  -- download this file as e.g. hello.hs
  -- brew install ghc
  -- ghci
  -- :r hello.hs

-- -- --

daniel-barlow

• get NixOS Virtualbox appliance from https://nixos.org/nixos/download.html#virtualbox-appliances
• start Virtualbox and "File -> Import Appliance" the downloaded OVA file
• go into Machine -> Settings, then Network / Adapter 1 / Advanced / ensure "Cable Connected" is checked
• start the machine, and wait for it to boot
• login at the graphical login screen, user: demo pw: demo
• when the desktop appears, go to "start" button (it is not labelled in any way) in bottom left, click to get menu
• open a shell with Applications -> System -> Terminal
• sudo -i
• nixos-generate-config --force
• nano /etc/nixos/configuration.nix and make the changes as shown in the diff (choose your own username)

daniel-barlow

 
Line 13:
    . /etc/sysconfig/network
    ^-- SC1091: Not following: /etc/sysconfig/network was not specified as input (see shellcheck -x).
 
Line 15:
if [ -z "$HOSTNAME" -o "$HOSTNAME" = "(none)" ]; then
                    ^-- SC2166: Prefer [ p ] || [ q ] as [ p -o q ] is not well defined.
 
Line 34:

daniel-barlow

;; Piezo is not a real bell

(ns piezo.core
  (:require [clojure.core.async :as async :refer [chan >! >!! <! <!! go]]))

;; stubs to be filled in later

(defn http-listening-chan
  "A channel which sends ring request maps on incoming HTTP requests
whose uri paths begin with `prefix`"

daniel-barlow

What is this about?

Convert your ruby app to run on JRuby (often fairly painless) then deploy it by generating a JAR file (should be reasonably painless) and copying it to the servers you're running on (should be bordering on trivial).

If you've never done Java programming, a JAR is a "Java ARchive" file which is basically a single ZIP file containing all the stuff your app needs to run. So you can install java on a new machine and copy the JAR file onto it, and you're ready to go.

What's wrong with how we do it now?

The usual way of deploying a Ruby app is to write (or copypasta) some Capistrano recipes to have the production machines check it out from a git repo then build it in exactly the same way you do on your Mac. This has downsides:

daniel-barlow

[global]
debug=true
#debug=false
# substitute your ec2 external ip for 52.x.y.x and your internal addr for 10.x.y.z
aliases=sip.52.19.37.223.xip.io
transports=sip:sip.52.19.37.223.xip.io;maddr=10.40.0.165

[module::Registrar]
enabled=true
reg-domains=sip.52.19.37.223.xip.io

daniel-barlow

building mongodb seems to hang forever in patchPhase.  It has no prePatch hooks, no patches, and a postPatch
hook  as follows

  postPatch = ''
    # fix environment variable reading
    substituteInPlace SConstruct \
        --replace "env = Environment(" "env = Environment(ENV = os.environ,"
  '';

and it's that substituteInPlace call that takes forever

daniel-barlow

dbarlow@macdbarlow-2 ~/src/geppetto (master=) $ vagrant box remove centipede
/Users/dbarlow/src/2geppetto/Vagrantfile:9: warning: already initialized constant CLOUDINIT_YML
/Users/dbarlow/src/geppetto/Vagrantfile:7: warning: previous definition of CLOUDINIT_YML was here
/Users/dbarlow/src/kitten/Vagrantfile:4: warning: already initialized constant REGION
/Users/dbarlow/src/chopin/Vagrantfile:4: warning: previous definition of REGION was here
/Users/dbarlow/src/kitten/Vagrantfile:5: warning: already initialized constant STAGE
/Users/dbarlow/src/chopin/Vagrantfile:5: warning: previous definition of STAGE was here
/Users/dbarlow/src/kitten/Vagrantfile:6: warning: already initialized constant APP
/Users/dbarlow/src/chopin/Vagrantfile:6: warning: previous definition of APP was here
/Users/dbarlow/src/kitten/Vagrantfile:7: warning: already initialized constant ROLE