{"id":13511666,"url":"https://github.com/opencontainers/image-spec","last_synced_at":"2025-09-09T21:05:30.442Z","repository":{"id":38555339,"uuid":"54503347","full_name":"opencontainers/image-spec","owner":"opencontainers","description":"OCI Image Format","archived":false,"fork":false,"pushed_at":"2025-04-24T17:16:11.000Z","size":5360,"stargazers_count":3720,"open_issues_count":76,"forks_count":712,"subscribers_count":160,"default_branch":"main","last_synced_at":"2025-05-05T14:21:38.375Z","etag":null,"topics":["containers","docker","oci"],"latest_commit_sha":null,"homepage":"https://www.opencontainers.org/","language":"Go","has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":"apache-2.0","status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/opencontainers.png","metadata":{"files":{"readme":"README.md","changelog":null,"contributing":null,"funding":null,"license":"LICENSE","code_of_conduct":null,"threat_model":null,"audit":null,"citation":null,"codeowners":"CODEOWNERS","security":null,"support":null,"governance":"GOVERNANCE.md","roadmap":null,"authors":null,"dei":null,"publiccode":null,"codemeta":null,"zenodo":null}},"created_at":"2016-03-22T19:34:41.000Z","updated_at":"2025-05-05T09:35:35.000Z","dependencies_parsed_at":"2022-07-12T23:10:29.960Z","dependency_job_id":"69ff9b33-f6f6-40c0-b3ce-23bcb1655513","html_url":"https://github.com/opencontainers/image-spec","commit_stats":{"total_commits":750,"total_committers":98,"mean_commits":7.653061224489796,"dds":0.836,"last_synced_commit":"da92727e9c8761ec087890466b8756b755aefd37"},"previous_names":[],"tags_count":25,"template":false,"template_full_name":null,"repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/opencontainers%2Fimage-spec","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/opencontainers%2Fimage-spec/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/opencontainers%2Fimage-spec/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/opencontainers%2Fimage-spec/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/opencontainers","download_url":"https://codeload.github.com/opencontainers/image-spec/tar.gz/refs/heads/main","host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":253776097,"owners_count":21962436,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2022-07-04T15:15:14.044Z","host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":["containers","docker","oci"],"created_at":"2024-08-01T03:01:04.707Z","updated_at":"2025-09-09T21:05:30.418Z","avatar_url":"https://github.com/opencontainers.png","language":"Go","funding_links":[],"categories":["Misc","Go","Specifications:","docker","CNAB"],"sub_categories":[],"readme":"# OCI Image Format Specification\n\n![License](https://img.shields.io/github/license/opencontainers/image-spec)\n[![Go Reference](https://pkg.go.dev/badge/github.com/opencontainers/image-spec.svg)](https://pkg.go.dev/github.com/opencontainers/image-spec)\n\nThe OCI Image Format project creates and maintains the software shipping container image format spec (OCI Image Format).\n\n**[The specification can be found here](spec.md).**\n\nThis repository also provides [Go types](specs-go), [intra-blob validation tooling, and JSON Schema](schema).\nThe Go types and validation should be compatible with the current Go release; earlier Go releases are not supported.\n\nAdditional documentation about how this group operates:\n\n- [Code of Conduct][code-of-conduct]\n- [Roadmap](#roadmap)\n- [Releases](RELEASES.md)\n\n## Running an OCI Image\n\nThe OCI Image Format partner project is the [OCI Runtime Spec project](https://github.com/opencontainers/runtime-spec).\nThe Runtime Specification outlines how to run a \"[filesystem bundle](https://github.com/opencontainers/runtime-spec/blob/main/bundle.md)\" that is unpacked on disk.\nAt a high-level an OCI implementation would download an OCI Image then unpack that image into an OCI Runtime filesystem bundle.\nAt this point the OCI Runtime Bundle would be run by an OCI Runtime.\n\nThis entire workflow supports the UX that users have come to expect from container engines like Docker and rkt: primarily, the ability to run an image with no additional arguments:\n\n- docker run example.com/org/app:v1.0.0\n- rkt run example.com/org/app,version=v1.0.0\n\nTo support this UX the OCI Image Format contains sufficient information to launch the application on the target platform (e.g. command, arguments, environment variables, etc).\n\n## Distributing an OCI Image\n\nThe [OCI Distribution Spec Project](https://github.com/opencontainers/distribution-spec/) defines an API protocol to facilitate and standardize the distribution of content.\nThis API includes support for pushing and pulling OCI images to an OCI conformant registry.\n\n## FAQ\n\n**Q: What happens to AppC or Docker Image Formats?**\n\nA: Existing formats can continue to be a proving ground for technologies, as needed.\nThe OCI Image Format project strives to provide a dependable open specification that can be shared between different tools and be evolved for years or decades of compatibility; as the deb and rpm format have.\n\nFind more [FAQ on the OCI site](https://www.opencontainers.org/faq).\n\n## Roadmap\n\nThe [GitHub milestones](https://github.com/opencontainers/image-spec/milestones) lay out the path to the future improvements.\n\n## Contributing\n\nDevelopment happens on GitHub for the spec.\nIssues are used for bugs and actionable items and longer discussions can happen on the [mailing list](#mailing-list).\n\nThe specification and code is licensed under the Apache 2.0 license found in the `LICENSE` file of this repository.\n\n### Discuss your design\n\nThe project welcomes submissions, but please let everyone know what you are working on.\n\nBefore undertaking a nontrivial change to this specification, send mail to the [mailing list](#mailing-list) to discuss what you plan to do.\nThis gives everyone a chance to validate the design, helps prevent duplication of effort, and ensures that the idea fits.\nIt also guarantees that the design is sound before code is written; a GitHub pull-request is not the place for high-level discussions.\n\nTypos and grammatical errors can go straight to a pull-request.\nWhen in doubt, start on the [mailing-list](#mailing-list).\n\n### Meetings\n\nPlease see the [OCI org repository README](https://github.com/opencontainers/org#meetings) for the most up-to-date information on OCI contributor and maintainer meeting schedules.\nYou can also find links to meeting agendas and minutes for all prior meetings.\n\n### Mailing List\n\nYou can subscribe and join the mailing list on [Google Groups](https://groups.google.com/a/opencontainers.org/forum/#!forum/dev).\n\n### Markdown style\n\nTo keep consistency throughout the Markdown files in the Open Container spec all files should be formatted one sentence per line.\nThis fixes two things: it makes diffing easier with git and it resolves fights about line wrapping length.\nFor example, this paragraph will span three lines in the Markdown source.\n\n### Git commit\n\n#### Sign your work\n\nThe sign-off is a simple line at the end of the explanation for the patch, which certifies that you wrote it or otherwise have the right to pass it on as an open-source patch.\nThe rules are pretty simple: if you can certify the below (from [developercertificate.org](https://developercertificate.org/)):\n\n```text\nDeveloper Certificate of Origin\nVersion 1.1\n\nCopyright (C) 2004, 2006 The Linux Foundation and its contributors.\n660 York Street, Suite 102,\nSan Francisco, CA 94110 USA\n\nEveryone is permitted to copy and distribute verbatim copies of this\nlicense document, but changing it is not allowed.\n\n\nDeveloper's Certificate of Origin 1.1\n\nBy making a contribution to this project, I certify that:\n\n(a) The contribution was created in whole or in part by me and I\n    have the right to submit it under the open source license\n    indicated in the file; or\n\n(b) The contribution is based upon previous work that, to the best\n    of my knowledge, is covered under an appropriate open source\n    license and I have the right under that license to submit that\n    work with modifications, whether created in whole or in part\n    by me, under the same open source license (unless I am\n    permitted to submit under a different license), as indicated\n    in the file; or\n\n(c) The contribution was provided directly to me by some other\n    person who certified (a), (b) or (c) and I have not modified\n    it.\n\n(d) I understand and agree that this project and the contribution\n    are public and that a record of the contribution (including all\n    personal information I submit with it, including my sign-off) is\n    maintained indefinitely and may be redistributed consistent with\n    this project or the open source license(s) involved.\n```\n\nthen you just add a line to every git commit message:\n\n```text\nSigned-off-by: Joe Smith \u003cjoe@gmail.com\u003e\n```\n\nusing your real name (sorry, no pseudonyms or anonymous contributions.)\n\nYou can add the sign off when creating the git commit via `git commit -s`.\n\n### Commit Style\n\nSimple house-keeping for clean git history.\nRead more on [How to Write a Git Commit Message](https://chris.beams.io/posts/git-commit/) or the Discussion section of [`git-commit(1)`](https://git-scm.com/docs/git-commit).\n\n1. Separate the subject from body with a blank line\n2. Limit the subject line to 50 characters\n3. Capitalize the subject line\n4. Do not end the subject line with a period\n5. Use the imperative mood in the subject line\n6. Wrap the body at 72 characters\n7. Use the body to explain what and why vs. how\n   - If there was important/useful/essential conversation or information, copy or include a reference\n8. When possible, one keyword to scope the change in the subject (i.e. \"README: ...\", \"runtime: ...\")\n\n[code-of-conduct]: https://github.com/opencontainers/org/blob/master/CODE_OF_CONDUCT.md\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fopencontainers%2Fimage-spec","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fopencontainers%2Fimage-spec","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fopencontainers%2Fimage-spec/lists"}