103 lines
2.3 KiB
Markdown
103 lines
2.3 KiB
Markdown
# tagcmp
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Comparison operations for image tags. Because registries aren't doing this for
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us 🙄 This library is helpful if you're aiming to use only "stable" and
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"semver-like" tags want to be able to do things like compare them, find which
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tags are more recent, sort them and other types of comparisons.
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A best-effort implementation which follows the wisdom of [Renovate].
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> Docker doesn't really have versioning, instead it supports "tags" and these
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> are usually used by Docker image authors as a form of versioning ... It's
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> pretty "wild west" for tagging and not always compliant with SemVer.
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The [Renovate implementation], which allows image tags to be automatically
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upgraded, is the only show in town, apparently. This library follows that
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implementation quite closely.
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[renovate]: https://github.com/renovatebot/renovate/blob/main/lib/versioning/docker/readme.md
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[renovate implementation]: https://github.com/renovatebot/renovate/tree/main/lib/datasource/docker
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## Public API
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> TODO
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## Types of versions supported
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```golang
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// semver
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"5",
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"2.6",
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"4.3.5",
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// semver with 'v'
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"v1",
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"v2.3",
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"v1.0.2",
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// semver with suffix
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"6-alpine",
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"6.2-alpine",
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"6.2.1-alpine",
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// semver with sufixx and 'v'
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"v6-alpine",
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"v6.2-alpine",
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"v6.2.1-alpine",
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"v6.2.1-alpine",
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// semver with multiple suffix values
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"v6.2.1-alpine-foo",
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```
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## Types of versions not supported
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> Please note, we could support some of these versions if people really need
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> them to be supported. Some tags are using a unique format which we could
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> support by implementing a very specific parser for (e.g. `ParseMinioTag`,
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> `ParseZncTag`). For now, this library tries to provide a `Parse` function
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> which handles more general cases. Please open an issue, change sets are
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> welcome.
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```golang
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// empty
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"",
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// patametrized
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"${MAILU_VERSION:-master}",
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"${PHP_VERSION}-fpm-alpine3.13",
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// commit hash like
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"0a1b2c3d4e5f6a7b8c9d0a1b2c3d4e5f6a7b8c9d",
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// numeric
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"20191109",
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"e02267d",
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// not semver
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"3.0.6.0",
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"r1295",
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"version-r1070",
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// prerelease
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"3.7.0b1",
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"3.8.0b1-alpine",
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// multiple versions
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"5.36-backdrop-php7.4",
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"v1.0.5_3.4.0",
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"v1.0.5_3.4.0_openid-sso",
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// tz based
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"RELEASE.2021-04-22T15-44-28Z",
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// only text
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"alpine",
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"latest",
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"master",
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// multiple - delimters
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"apache-debian-1.8-prod",
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"version-znc-1.8.2",
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```
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