A conventional Docker image builder that simply accepts webhooks from any Github repository, builds an image for that repository, and pushes it to the supplied registry tagged with its git SHA using the same name as the repo.

You totally can. Those are both good options. However, this project gives you the ability to easily build and push images to your own Docker registry by simply setting up a single Github webhook. It allows you to easily set up lots of builds with zero configuration (or even for an entire organization in the latest version of Github Enterprise). It also enforces some conventions:

• Naming the Docker image the same as the code repository
• Tagging the image with the last 7 of the SHA and "latest" and pushing both to the registry

$ builder -help
Usage of builder:
  -cache-path="cache/": path to the directory where cached repos will be stored
  -debug=false: enable /debug endpoints on DEBUG_LISTEN
  -debug-listen=":3001": host:port to listen on for debug requests
  -docker-cert-path="": path to the cert.pem, key.pem, and ca.pem for authenticating to Docker
  -docker-host="unix:///var/run/docker.sock": address of Docker host
  -docker-tls-verify=false: use TLS client for Docker
  -dsn="file::memory:?cache=shared": DSN string for connecting to the database
  -listen=":3000": host:port to listen on
  -registry-url="192.168.59.103:5000": host:port of the registry for pushing images
  -sql-adapter="sqlite3": adapter to use for the DSN string (currently only supports sqlite3)

• Triggering a build

  $ curl http://localhost:3000/webhooks/github -H "Content-Type: application/json" -d @support/github_sample.json -v
  * Hostname was NOT found in DNS cache
  *   Trying ::1...
  * Connected to localhost (::1) port 3000 (#0)
  > POST /webhooks/github HTTP/1.1
  > User-Agent: curl/7.37.1
  > Host: localhost:3000
  > Accept: */*
  > Content-Type: application/json
  > Content-Length: 7408
  > Expect: 100-continue
  >
  < HTTP/1.1 100 Continue
  < HTTP/1.1 200 OK
  < Content-Type: application/json; charset=utf-8
  < Date: Wed, 01 Apr 2015 10:05:10 GMT
  < Content-Length: 233
  <
  {"id":"319db017-21ab-4ac0-be26-4bfd8688b7a5","repository_name":"hello-world","clone_url":"https://github.com/deployster/hello-world.git","commit_id":"96ac589c5a5d4366446e6675598bed1671913521","git_ref":"refs/heads/refactor-polling"}
  * Connection #0 to host localhost left intact

• Listing running builds

  $ curl http://localhost:3000/builds -v
  * Hostname was NOT found in DNS cache
  *   Trying ::1...
  * Connected to localhost (::1) port 3000 (#0)
  > GET /builds HTTP/1.1
  > User-Agent: curl/7.37.1
  > Host: localhost:3000
  > Accept: */*
  >
  < HTTP/1.1 200 OK
  < Content-Type: application/json; charset=utf-8
  < Date: Wed, 01 Apr 2015 10:05:16 GMT
  < Content-Length: 235
  <
  [{"id":"319db017-21ab-4ac0-be26-4bfd8688b7a5","repository_name":"hello-world","clone_url":"https://github.com/deployster/hello-world.git","commit_id":"96ac589c5a5d4366446e6675598bed1671913521","git_ref":"refs/heads/refactor-polling"}]
  * Connection #0 to host localhost left intact

• Following the progress of a build

  $ curl http://localhost:3000/builds/319db017-21ab-4ac0-be26-4bfd8688b7a5 -v
  * Hostname was NOT found in DNS cache
  *   Trying ::1...
  * Connected to localhost (::1) port 3000 (#0)
  > GET /builds/319db017-21ab-4ac0-be26-4bfd8688b7a5 HTTP/1.1
  > User-Agent: curl/7.37.1
  > Host: localhost:3000
  > Accept: */*
  >
  < HTTP/1.1 200 OK
  < Content-Type: text/plain
  < Date: Wed, 01 Apr 2015 10:05:24 GMT
  < Transfer-Encoding: chunked
  <
  Step 0 : FROM yammer/ruby:2.2.0
   ---> 7828aa49f4ac
  Step 1 : MAINTAINER Brian Morton "brian@mmm.hm"
   ---> Using cache
   ---> dc0f4b99910c
  Step 2 : ADD Gemfile /app/Gemfile
   ---> Using cache
   ---> 7fc9532741d6
  Step 3 : ADD Gemfile.lock /app/Gemfile.lock
   ---> Using cache
   ---> bf0446b9c8c6
  Step 4 : RUN bash -l -c "cd /app && bundle"
   ---> Using cache
   ---> 44ad8af43010
  ...
  Pushing [=========================>                         ]    512 B/1.024 kB 0
  Pushing [==================================================>] 1.024 kB/1.024 kB
  Pushing [==================================================>] 1.024 kB/1.024 kB
  Image successfully pushed
  Pushing tag for rev [626431e69f0d] on {http://192.168.59.103:5000/v1/repositories/hello-world/tags/96ac589}