local docker dev off any image (like python:3.6-alpine)

dev

#!/usr/bin/env bash

# BEGIN SANITY BOX------------------------------------------
set -e           # immediately exit if any command fails   |
set -u           # immediately fail on undefined variables |
set -o pipefail  # show error of last failed command       |
IFS=$'\n\t'      # control what word splitting means       |
# END SANITY BOX--------------------------------------------

# usage:

# `./docker-dev <DIR_NAME> <IMAGE_NAME>`. This will:

#  a) create a directory called <DIR_NAME> if it does not exist
#  b) create a Dockerfile in there, if it doesn't exist
#  c) apply <IMAGE_NAME> as the base image for the Dockerfile
#  d) build a local image of the Dockerfile
#  e) run the image, and:
#    i) volume mount <DIR_NAME> to /app in the container
#    ii) give you a terminal
#  f) remove the container on exit

# This will let you edit code locally, but run that code inside the container.

# If the directory and Dockerfile already exist, then just do:

# `./docker-dev <DIR_NAME>`

# That will build and run the container at the terminal.

dir_name=$1
image_name=${2-python:3.6-alpine}

# template rendering function
render_template() {
  eval "echo \"$(sed 's/\"/\\\\"/g' $1)\""
}

# create the directory if it doesn't exist
if [ ! -d "$dir_name" ]; then
  mkdir $dir_name
fi

# render the Dockerfile from the template if it doesn't exist
if [ ! -f "$dir_name/Dockerfile" ]; then
    render_template ./Dockerfile.template > ./$dir_name/Dockerfile
fi

# build image
docker build -t docker-dev-$dir_name ./$dir_name

# run terminal in container, mount local code into it, and remove container
# when it stops NOTE: /bin/bash might not be present on some images, so you
# may have to use something else.

docker run -it -v ${PWD}/$dir_name/:/app \
    --rm \
    --entrypoint /bin/bash \
    docker-dev-$dir_name

Dockerfile.template

FROM ${image_name}

WORKDIR /app