Add support for using different docker images

The part of trying out scripts involve creating a docker container with
ssh and running some projects and functions on it.

This change allows to define the docker image name to be used with the
docker-* functions.

README.md

@@ -51,14 +51,14 @@ kickstart create [folder name or current folder]
 Creates a docker container with a running sshd to test recipes
 
 ```bash
-kickstart docker-create
+kickstart docker-create [image-name]
 ```
 
 #### docker-ssh
 Access the created docker container over ssh. A simple utility that looks up for the port the docker is bound.
 
 ```bash
-kickstart docker-ssh
+kickstart docker-ssh [image-name]
 ```
 
 
@@ -162,5 +162,15 @@ Prepend DEBUG=1 to the command and you will see massive ammount of commands on y
 DEBUG=1 kickstart local nodejs
 ```
 
+### Choosing the docker image to use
+You can choose an specific image to use on the docker-* commands.
+On order, it looks up for an image as an argument, on the `KICKSTART_DOCKER_IMAGE` env variable or defaults to moul/sshd.
+You can use any image that is on the index, you probably want it to have an sshd running by default.
+
+Docker images tested:
+
+* [moul/sshd](https://index.docker.io/u/moul/sshd/)
+* [bltavares/centos-ssh](https://index.docker.io/u/bltavares/centos-ssh/)
+
 ### Thanks
 This project was inspired on [sunzi](https://github.com/kenn/sunzi)

lib/kickstart-docker-create

@@ -1,17 +1,20 @@
 #!/bin/bash -e
 
+image_name=${1:-$KICKSTART_DOCKER_IMAGE}
+image_name=${image_name:-moul/sshd}
+
 pull_sshd_image() {
-  docker pull moul/sshd
+  docker pull $image_name
 }
 
 remove_running_sshd() {
-  runnig_sshd=$(docker ps -q moul/sshd)
+  runnig_sshd=$(docker ps -q $image_name)
   [ "$runnig_sshd" ] && docker kill "$runnig_sshd" && docker rm "$runnig_sshd"
   true
 }
 
 run_sshd() {
-  id=$(docker run -p 22 -d moul/sshd)
+  id=$(docker run -p 22 -d $image_name)
 
   [ -z "$id" ] && echo "Docker container did't start" && return 1
 

lib/kickstart-docker-ssh

@@ -1,6 +1,9 @@
 #!/bin/bash -e
 
-runnig_sshd=$(docker ps -q moul/sshd)
+image_name=${1:-$KICKSTART_DOCKER_IMAGE}
+image_name=${image_name:-moul/sshd}
+
+runnig_sshd=$(docker ps -q $image_name)
 [ -z "$runnig_sshd" ] && echo "Docker container not created. Run \`kickstart docker-create\` to get one" && exit 1
 
 port=`docker port $runnig_sshd 22 | cut -f 2 -d :`