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docs(deps): Add pre-release explanation from Resolver docs

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This will let the dependency resolution docs better focus.
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Ed Page 2024-10-08 15:59:17 -05:00
parent b95fcc2840
commit 940e82cba3
2 changed files with 32 additions and 35 deletions
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37
src/doc/src/reference/resolver.md
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@ -137,41 +137,6 @@ ecosystem if you publish a SemVer-incompatible version of a popular library.
[semver trick]: https://github.com/dtolnay/semver-trick
[`downcast_ref`]: ../../std/any/trait.Any.html#method.downcast_ref
### Pre-releases
SemVer has the concept of "pre-releases" with a dash in the version, such as
`1.0.0-alpha`, or `1.0.0-beta`. Cargo will avoid automatically using
pre-releases unless explicitly asked. For example, if `1.0.0-alpha` of package
`foo` is published, then a requirement of `foo = "1.0"` will *not* match, and
will return an error. The pre-release must be specified, such as `foo =
"1.0.0-alpha"`. Similarly [`cargo install`] will avoid pre-releases unless
explicitly asked to install one.
Cargo allows "newer" pre-releases to be used automatically. For example, if
`1.0.0-beta` is published, then a requirement `foo = "1.0.0-alpha"` will allow
updating to the `beta` version. Note that this only works on the same release
version, `foo = "1.0.0-alpha"` will not allow updating to `foo = "1.0.1-alpha"`
or `foo = "1.0.1-beta"`.
Cargo will also upgrade automatically to semver-compatible released versions
from prereleases. The requirement `foo = "1.0.0-alpha"` will allow updating to
`foo = "1.0.0"` as well as `foo = "1.2.0"`.
Beware that pre-release versions can be unstable, and as such care should be
taken when using them. Some projects may choose to publish breaking changes
between pre-release versions. It is recommended to not use pre-release
dependencies in a library if your library is not also a pre-release. Care
should also be taken when updating your `Cargo.lock`, and be prepared if a
pre-release update causes issues.
The pre-release tag may be separated with periods to distinguish separate
components. Numeric components will use numeric comparison. For example,
`1.0.0-alpha.4` will use numeric comparison for the `4` component. That means
that if `1.0.0-alpha.11` is published, that will be chosen as the greatest
release. Non-numeric components are compared lexicographically.
[`cargo install`]: ../commands/cargo-install.md
## Other constraints
Version requirements aren't the only constraint that the resolver considers
@ -590,11 +555,13 @@ circumstances:
change of your own library, for example if it exposes types from the
dependency.
[`cargo install`]: ../commands/cargo-install.md
<script>
(function() {
var fragments = {
"#version-metadata": "specifying-dependencies.html#version-metadata",
"#pre-releases": "specifying-dependencies.html#pre-releases",
};
var target = fragments[window.location.hash];
if (target) {

30
src/doc/src/reference/specifying-dependencies.md
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@ -112,6 +112,36 @@ Here are some examples of comparison requirements:
As shown in the examples above, multiple version requirements can be
separated with a comma, e.g., `>= 1.2, < 1.5`.
### Pre-releases
Version requirements exclude [pre-release versions](manifest.md#the-version-field), such as `1.0.0-alpha`,
unless specifically asked for.
For example, if `1.0.0-alpha` of package
`foo` is published, then a requirement of `foo = "1.0"` will *not* match, and
will return an error. The pre-release must be specified, such as `foo =
"1.0.0-alpha"`.
Similarly [`cargo install`] will avoid pre-releases unless
explicitly asked to install one.
Cargo allows "newer" pre-releases to be used automatically. For example, if
`1.0.0-beta` is published, then a requirement `foo = "1.0.0-alpha"` will allow
updating to the `beta` version. Note that this only works on the same release
version, `foo = "1.0.0-alpha"` will not allow updating to `foo = "1.0.1-alpha"`
or `foo = "1.0.1-beta"`.
Cargo will also upgrade automatically to semver-compatible released versions
from prereleases. The requirement `foo = "1.0.0-alpha"` will allow updating to
`foo = "1.0.0"` as well as `foo = "1.2.0"`.
Beware that pre-release versions can be unstable, and as such care should be
taken when using them. Some projects may choose to publish breaking changes
between pre-release versions. It is recommended to not use pre-release
dependencies in a library if your library is not also a pre-release. Care
should also be taken when updating your `Cargo.lock`, and be prepared if a
pre-release update causes issues.
[`cargo install`]: ../commands/cargo-install.md
### Version metadata
[Version metadata](manifest.md#the-version-field), such as `1.0.0+21AF26D3`,