Enum cargo::core::resolver::ResolveVersion

pub enum ResolveVersion {
    V1,
    V2,
    V3,
    V4,
}

A version to indicate how a Cargo.lock should be serialized.

When creating a new lockfile, the version with #[default] is used. If an old version of lockfile already exists, it will stay as-is.

It’s important that if a new version is added that this is not updated until at least the support for the version is in the stable release of Rust.

This resolve version will be used for all new lock files, for example those generated by cargo update (update everything) or building after a cargo new (where no lock file previously existed). This is also used for updated lock files such as when a dependency is added or when a version requirement changes. In this situation Cargo’s updating the lock file anyway so it takes the opportunity to bump the lock file version forward.

It’s theorized that we can add more here over time to track larger changes to the Cargo.lock format, but we’ve yet to see how that strategy pans out.

Variants

V1

Historical baseline for when this abstraction was added.

V2

A more compact format, more amenable to avoiding source-control merge conflicts. The dependencies arrays are compressed and checksums are listed inline. Introduced in 2019 in version 1.38. New lockfiles use V2 by default from 1.41 to 1.52.

V3

A format that explicitly lists a version at the top of the file as well as changing how git dependencies are encoded. Dependencies with branch = "master" are no longer encoded the same way as those without branch specifiers. Introduced in 2020 in version 1.47. New lockfiles use V3 by default staring in 1.53.

V4

Unstable. Will collect a certain amount of changes and then go.

Changes made:

• SourceId URL serialization is aware of URL encoding.

Trait Implementations

impl Clone for ResolveVersion

fn clone(&self) -> ResolveVersion

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ResolveVersion

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for ResolveVersion

fn default() -> ResolveVersion

Returns the “default value” for a type.

impl Ord for ResolveVersion

fn cmp(&self, other: &ResolveVersion) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Selfwhere Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Selfwhere Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Selfwhere Self: Sized + PartialOrd<Self>,

Restrict a value to a certain interval.

impl PartialEq<ResolveVersion> for ResolveVersion

fn eq(&self, other: &ResolveVersion) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd<ResolveVersion> for ResolveVersion

fn partial_cmp(&self, other: &ResolveVersion) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl Copy for ResolveVersion

impl Eq for ResolveVersion

impl StructuralEq for ResolveVersion

impl StructuralPartialEq for ResolveVersion

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 1 byte

Size for each variant:

• V1: 0 bytes
• V2: 0 bytes
• V3: 0 bytes
• V4: 0 bytes