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* [docs] Improve inter-document linking; add 'latest' links * [docs] Apply suggestions from code review Co-authored-by: nicole mazzuca <mazzucan@outlook.com> Co-authored-by: nicole mazzuca <mazzucan@outlook.com> Co-authored-by: Robert Schumacher <roschuma@microsoft.com>
90 lines
3.3 KiB
Markdown
90 lines
3.3 KiB
Markdown
# Versioning
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**The latest version of this documentation is available on [GitHub](https://github.com/Microsoft/vcpkg/tree/master/docs/users/versioning.md).**
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**This feature is experimental and requires `--feature-flags=versions`**
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Versioning allows you to deterministically control the precise revisions of dependencies used by
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your project from within your manifest file.
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See our guide to [getting started with versioning](../examples/versioning.getting-started.md).
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## Version schemes
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### Schemes
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Versions in vcpkg come in four primary flavors:
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#### version
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A dot-separated sequence of numbers (1.2.3.4)
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#### version-date
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A date (2021-01-01.5)
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#### version-semver
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A Semantic Version 2.0 (2.1.0-rc2)
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See https://semver.org/ for a full specification.
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#### version-string
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An exact, incomparable version (Vista)
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### Port Versions
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Each version additionally has a "port-version" which is a nonnegative integer. When rendered as text, the
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port version (if nonzero) is added as a suffix to the primary version text separated by a hash (#).
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Port-versions are sorted lexographically after the primary version text, for example:
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1.0.0 < 1.0.0#1 < 1.0.1 < 1.0.1#5 < 2.0.0
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## Constraints
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Manifests can place three kinds of constraints upon the versions used:
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### builtin-baseline
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The baseline references a commit within the vcpkg repository that
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establishes a minimum version on every dependency in the graph. If
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no other constraints are specified (directly or transitively),
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then the version from the baseline of the top level manifest will
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be used.
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You can get the current commit of your vcpkg instance either by adding an empty `"builtin-baseline"` field, installing, and examining the error message or by running `git rev-parse HEAD` in the root of the vcpkg instance.
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Baselines provide stability and ease of development for top-level manifest files. They are not considered from ports consumed as a dependency. If a minimum version constraint is required during transitive version resolution, the port should use `version>=`.
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### version>=
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Within the "dependencies" field, each dependency can have a
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minimum constraint listed. These minimum constraints will be used
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when transitively depending upon this library. A minimum
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port-version can additionally be specified with a '#' suffix.
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This constraint must refer to an existing, valid version (including port-version).
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### overrides
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When used as the top-level manifest (such as when running `vcpkg
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install` in the directory), overrides allow a manifest to
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short-circuit dependency resolution and specify exactly the
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version to use. These can be used to handle version conflicts,
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such as with `version-string` dependencies.
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Overrides are not considered from ports consumed as a dependency.
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## Example top-level manifest:
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```json
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{
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"name": "example",
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"version": "1.0",
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"builtin-baseline": "a14a6bcb27287e3ec138dba1b948a0cdbc337a3a",
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"dependencies": [
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{ "name": "zlib", "version>=": "1.2.11#8" },
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"rapidjson"
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],
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"overrides": [
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{ "name": "rapidjson", "version": "2020-09-14" }
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]
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}
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```
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See also the [manifest documentation](manifests.md) for more syntax information.
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## Original Specification
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See also the [original specification](https://github.com/vicroms/vcpkg/blob/versioning-spec/docs/specifications/versioning.md)
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