docker-snapshot-image

Command line utiltiy that allows to easily create docker snapshot-images from an exising node.js project. The resulting images by default will be tagged as follows: {project-name}:{project-version}-{git-short-hash}

Prerequisites

Since this application makes use of git and docker, the two applications must be preinstalled on the system. Additionally, the directory in which the application is executed, must contain a valid package.json and Dockerfile.

Usage

You can use this utilty by installing it globally and executing it in your project's root directory:

npm i -g  docker-snapshot-image
cd /path/to/your/project
docker-snapshot-image

For a project with the following package.json:

{
  "name": "my-project",
  "version": "1.1.0",
  ...
}

executing the command would result in an image with a tag of the follwoing shape my-project:1.1.0-f941929. The hash appended to the version of the images always matches the short-version of the project's current git commit.

For advanced usage, command line flags can be used to change the default behavoir of the application:

Flag	Description
--fixed-tag	Additionally tag the image with the specified tag (could be used to always add latest tag to image)
--auto-tag-format	Format of the automatically generated tag. Available variable are {branch-name}, {pkg-version} and {commit-hash}. The default format is {pkg-version}-{commit-hash}
--image-name	Use the specified custom name for the image
--no-auto	Do not create the image with the automatic snapshot-tag specified in auto-tag-format

However, for a fully detailed description of all flags that can be used, see the application's usage information (docker-snapshot-image --help).

NOTES

For branchname determination we are generally using the git rev-parse --abbrev-ref HEAD command. However, since some CI environments (e.g. Jenkins) are not actually checking out the actual branch but rather the pushed commit itself, we are optionally checking for environment varable BRANCH_NAME before starting branchname determination using git rev-parse.

Environment variables

The application reads the following environment variables:

• CONTAINER_IMAGE_REGISTRY_PASS
• CONTAINER_IMAGE_REGISTRY_USER
• CONTAINER_IMAGE_REGISTRY_REPO