Tagfish

WARNING

Tagfish has been deprecated, in favour of dfresh.

Tagfish is a CLI tool to interact with Docker registries.

Features include:

• List all the tags of a given Docker repository
• Return the most recent explicit tag of a repository
• Update a file with the newest tags
• Authenticate by reading native Docker config file
• Works against hub.docker.com and private registries
• Supports Docker Registry/Distribution API v1 and v2

To use Tagfish against a registry requiring authentication, you first need to authenticate to the given registry using docker login <REGISTRY>.

• Usage
  • tagfish tags
    • Example
  • tagfish update
    • Example
    • Official repositories
• Installation
  • Gem
    • Limitations
  • Docker image
• Development
• Contributing
• Licence

The Tagfish CLI tool has different subcommands for interacting with Docker registries.

The tags subcommands is used to retrieve tags from a given repository:

Usage:
    tagfish tags [OPTIONS] REPOSITORY

Parameters:
    REPOSITORY                    docker repository

Options:
    -l, --latest                  only return latest explicitly tagged image
    -s, --short                   only return tag, not full image path
    -h, --help                    print help

Where repository is a docker repository path, including the docker registry. The tags are returned in alphabetical order.

The --latest option gets the image ID of the docker image tagged latest in the repository, finds a matching image with a tag set manually (e.g: date, version number), and returns that tag. This option will not work if there is no image tagged latest in your repository.

$ tagfish tags alpine
alpine:2.6
alpine:2.7
alpine:3.1
alpine:3.2
alpine:edge
alpine:latest

The update subcommand is used to update a file with the latest tags available:

Usage:
    tagfish update [OPTIONS] FILE

Parameters:
    FILE                          file to update

Options:
    -d, --dry-run                 enable dry run
    --only PATTERN                Only update repositories matching pattern. Wildcards `*` may be used.
    -h, --help                    print help

$ tagfish update --dry-run Dockerfile
-FROM docker-registry.delivery.realestate.com.au/gpde/ubuntu-ruby2.2:201508191500
+FROM docker-registry.delivery.realestate.com.au/gpde/ubuntu-ruby2.2:201511261833

tagfish update will update repositories such as:

private.registry/namespace/repository:tag
namespace/repository:tag

However, it will not update the tag of official repositories, such as:

ubuntu:tag

This is because updating to a new OS automatically might be something you want to avoid, and because it is hard to match a repository without a namespace.

Tagfish is packaged as a Ruby gem. Install it from the command line:

$ gem install tagfish

Tagfish requires Ruby 2.2 or newer if the registry you are accessing restricts TLS to v1.2.

Tagfish is released as a Docker image as well, and can be run with:

docker run --rm \
  -v ~/.docker:/root/.docker:ro \
  -v ${PWD}:/cwd \
  cowbell/tagfish \
  <COMMAND>

• Use dev tagfish

$ auto/tagfish

• Run the tests

$ auto/test

• Package gem and Docker image

$ auto/package

• Release gem and Docker image

$ auto/release

This requires write access to the Git repo, the Gem repo, and the Docker repo.

Bug reports and pull requests are welcome on GitHub at https://github.com/realestate-com-au/tagfish .

Copyright (c) 2015 REA Group Ltd.

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.