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## Workspaces | ||
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A *workspace* is a collection of one or more packages that share common | ||
dependency resolution (with a shared `Cargo.lock`), output directory, and | ||
various settings such as profiles. Packages that are part of a workspaces are | ||
called *workspace members*. There are two flavours of workspaces: as root | ||
package or as virtual manifest. | ||
A *workspace* is a collection of one or more packages, called *workspace | ||
members*, that are managed together. | ||
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### Root package | ||
The key points of workspaces are: | ||
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* Common commands can run across all workspace members, like `cargo check --workspace`. | ||
* All packages share a common [`Cargo.lock`] file which resides in the | ||
*workspace root*. | ||
* All packages share a common [output directory], which defaults to a | ||
directory named `target` in the *workspace root*. | ||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. Should the benefits of sharing a There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. For output, let's rely on the information in that link. For cargo.lock, let's mirror output and provide a link for more details. |
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* Sharing package metadata, like with [`workspace.package`](#the-package-table). | ||
* The [`[patch]`][patch], [`[replace]`][replace] and [`[profile.*]`][profiles] | ||
sections in `Cargo.toml` are only recognized in the *root* manifest, and | ||
ignored in member crates' manifests. | ||
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In the `Cargo.toml`, the `[workspace]` table supports the following sections: | ||
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* [`[workspace]`](#the-workspace-section) — Defines a workspace. | ||
* [`resolver`](resolver.md#resolver-versions) — Sets the dependency resolver to use. | ||
* [`members`](#the-members-and-exclude-fields) — Packages to include in the workspace. | ||
* [`exclude`](#the-members-and-exclude-fields) — Packages to exclude from the workspace. | ||
* [`default-members`](#the-default-members-field) — Packages to operate on when a specific package wasn't selected. | ||
* [`package`](#the-package-table) — Keys for inheriting in packages. | ||
* [`dependencies`](#the-dependencies-table) — Keys for inheriting in package dependencies. | ||
* [`metadata`](#the-metadata-table) — Extra settings for external tools. | ||
* [`[patch]`](overriding-dependencies.md#the-patch-section) — Override dependencies. | ||
* [`[replace]`](overriding-dependencies.md#the-replace-section) — Override dependencies (deprecated). | ||
* [`[profile]`](profiles.md) — Compiler settings and optimizations. | ||
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### The `[workspace]` section | ||
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To create a workspace, you add the `[workspace]` table to a `Cargo.toml`: | ||
```toml | ||
[workspace] | ||
# ... | ||
``` | ||
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A workspace can be created by adding a [`[workspace]` | ||
section](#the-workspace-section) to `Cargo.toml`. This can be added to a | ||
`Cargo.toml` that already defines a `[package]`, in which case the package is | ||
At minimum, a workspace has to have a member, either with a root package or as | ||
a virtual manifest. | ||
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#### Root package | ||
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If the [`[workspace]` section](#the-workspace-section) is added to a | ||
`Cargo.toml` that already defines a `[package]`, the package is | ||
the *root package* of the workspace. The *workspace root* is the directory | ||
where the workspace's `Cargo.toml` is located. | ||
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### Virtual manifest | ||
```toml | ||
[workspace] | ||
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[package] | ||
name = "hello_world" # the name of the package | ||
version = "0.1.0" # the current version, obeying semver | ||
authors = ["Alice <[email protected]>", "Bob <[email protected]>"] | ||
``` | ||
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<a id="virtual-manifest"></a> | ||
#### Virtual workspace | ||
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Alternatively, a `Cargo.toml` file can be created with a `[workspace]` section | ||
but without a [`[package]` section][package]. This is called a *virtual | ||
manifest*. This is typically useful when there isn't a "primary" package, or | ||
you want to keep all the packages organized in separate directories. | ||
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### Key features | ||
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The key points of workspaces are: | ||
```toml | ||
# [PROJECT_DIR]/Cargo.toml | ||
[workspace] | ||
members = ["hello_world"] | ||
``` | ||
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* All packages share a common `Cargo.lock` file which resides in the | ||
*workspace root*. | ||
* All packages share a common [output directory], which defaults to a | ||
directory named `target` in the *workspace root*. | ||
* The [`[patch]`][patch], [`[replace]`][replace] and [`[profile.*]`][profiles] | ||
sections in `Cargo.toml` are only recognized in the *root* manifest, and | ||
ignored in member crates' manifests. | ||
```toml | ||
# [PROJECT_DIR]/hello_world/Cargo.toml | ||
[package] | ||
name = "hello_world" # the name of the package | ||
version = "0.1.0" # the current version, obeying semver | ||
authors = ["Alice <[email protected]>", "Bob <[email protected]>"] | ||
``` | ||
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### The `[workspace]` section | ||
### The `members` and `exclude` fields | ||
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The `[workspace]` table in `Cargo.toml` defines which packages are members of | ||
The `members` and `exclude` fields define which packages are members of | ||
the workspace: | ||
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```toml | ||
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@@ -56,26 +101,24 @@ workspace. This can be useful if some path dependencies aren't desired to be | |
in the workspace at all, or using a glob pattern and you want to remove a | ||
directory. | ||
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An empty `[workspace]` table can be used with a `[package]` to conveniently | ||
create a workspace with the package and all of its path dependencies. | ||
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### Workspace selection | ||
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When inside a subdirectory within the workspace, Cargo will automatically | ||
search the parent directories for a `Cargo.toml` file with a `[workspace]` | ||
definition to determine which workspace to use. The [`package.workspace`] | ||
manifest key can be used in member crates to point at a workspace's root to | ||
override this automatic search. The manual setting can be useful if the member | ||
is not inside a subdirectory of the workspace root. | ||
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### Package selection | ||
#### Package selection | ||
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In a workspace, package-related cargo commands like [`cargo build`] can use | ||
the `-p` / `--package` or `--workspace` command-line flags to determine which | ||
packages to operate on. If neither of those flags are specified, Cargo will | ||
use the package in the current working directory. If the current directory is | ||
a virtual workspace, it will apply to all members (as if `--workspace` were | ||
specified on the command-line). | ||
a [virtual workspace](#virtual-workspace), it will apply to all members (as if | ||
`--workspace` were specified on the command-line). See also | ||
[`default-members`](#the-default-members-field). | ||
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### The `default-members` field | ||
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The optional `default-members` key can be specified to set the members to | ||
operate on when in the workspace root and the package selection flags are not | ||
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@@ -89,30 +132,7 @@ default-members = ["path/to/member2", "path/to/member3/foo"] | |
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When specified, `default-members` must expand to a subset of `members`. | ||
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### The `workspace.metadata` table | ||
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The `workspace.metadata` table is ignored by Cargo and will not be warned | ||
about. This section can be used for tools that would like to store workspace | ||
configuration in `Cargo.toml`. For example: | ||
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```toml | ||
[workspace] | ||
members = ["member1", "member2"] | ||
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[workspace.metadata.webcontents] | ||
root = "path/to/webproject" | ||
tool = ["npm", "run", "build"] | ||
# ... | ||
``` | ||
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There is a similar set of tables at the package level at | ||
[`package.metadata`][package-metadata]. While cargo does not specify a | ||
format for the content of either of these tables, it is suggested that | ||
external tools may wish to use them in a consistent fashion, such as referring | ||
to the data in `workspace.metadata` if data is missing from `package.metadata`, | ||
if that makes sense for the tool in question. | ||
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### The `workspace.package` table | ||
### The `package` table | ||
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The `workspace.package` table is where you define keys that can be | ||
inherited by members of a workspace. These keys can be inherited by | ||
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@@ -157,7 +177,7 @@ description.workspace = true | |
documentation.workspace = true | ||
``` | ||
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### The `workspace.dependencies` table | ||
### The `dependencies` table | ||
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The `workspace.dependencies` table is where you define dependencies to be | ||
inherited by members of a workspace. | ||
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@@ -196,7 +216,31 @@ cc.workspace = true | |
rand.workspace = true | ||
``` | ||
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### The `metadata` table | ||
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The `workspace.metadata` table is ignored by Cargo and will not be warned | ||
about. This section can be used for tools that would like to store workspace | ||
configuration in `Cargo.toml`. For example: | ||
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```toml | ||
[workspace] | ||
members = ["member1", "member2"] | ||
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[workspace.metadata.webcontents] | ||
root = "path/to/webproject" | ||
tool = ["npm", "run", "build"] | ||
# ... | ||
``` | ||
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There is a similar set of tables at the package level at | ||
[`package.metadata`][package-metadata]. While cargo does not specify a | ||
format for the content of either of these tables, it is suggested that | ||
external tools may wish to use them in a consistent fashion, such as referring | ||
to the data in `workspace.metadata` if data is missing from `package.metadata`, | ||
if that makes sense for the tool in question. | ||
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[package]: manifest.md#the-package-section | ||
[`Cargo.lock`]: ../guide/cargo-toml-vs-cargo-lock.md | ||
[package-metadata]: manifest.md#the-metadata-table | ||
[output directory]: ../guide/build-cache.md | ||
[patch]: overriding-dependencies.md#the-patch-section | ||
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