The containers/image repository is a Go library that provides comprehensive functionality for working with container images and container image registries. It serves as a foundational toolkit for applications that need to interact with container image systems, enabling operations like pulling and pushing images from registries such as docker.io and quay.io. The library implements simple image signing capabilities and allows applications to inspect repositories on container registries without requiring a full image pull, fetching only the manifest to provide docker inspect-like JSON output about repositories or tags.
A key capability of containers/image is its image format translation functionality, allowing conversion between different image formats such as translating docker container images to OCI-compliant images. The library also enables copying container images between various registries with optional format conversion during the transfer process, and provides image signing and verification features. This makes it particularly valuable for workflows that require format standardization or multi-registry image management without the overhead of pulling complete images locally.
The library is designed as a pure Go module with no built-in user interface, making it suitable for integration into other Go programs. The skopeo tool, maintained in the same containers organization, serves as the primary command-line interface that leverages containers/image functionality, exposing features like the copy.Image capability through user-friendly commands. The library supports multiple build tags that allow developers to customize dependencies based on their needs, including options to stub out docker daemon transport, containers-storage transport, and choices between different OpenPGP implementations for signature verification, including Golang-only implementations and Sequoia-PGP support.
According to GitGenius activity tracking, the repository shows a median issue and pull request response latency of 4.6 hours across monitored items, indicating active maintenance. The most active contributor tracked is mtrmac with 96 events, followed by Luap99 with 10 events and dcraigmv with 5 events. Feature requests and bug reports represent the most common issue types, with 8 items each in the tracked categories. The repository overlaps with contributors from microsoft/vscode, rust-lang/rust, and microsoft/typescript, suggesting cross-project collaboration.
It is important to note that the repository has undergone significant organizational changes. A warning in the README indicates that the package has been moved and users should update references to use go.podman.io/image/v5 instead. New development of the project is happening on the containers/container-libs repository as part of a broader migration to a monorepo structure announced in August 2025. The library depends on various C libraries and Go module dependencies documented in go.mod, with build configuration options available for developers who want to minimize external dependencies. The project is licensed under Apache License 2.0 and maintains community engagement through a mailing list and IRC channel for contributors and users.
