cargo−fetch − Fetch dependencies of a package from the network
cargo fetch [options]
If a Cargo.lock file is available, this command will ensure that all of the git dependencies and/or registry dependencies are downloaded and locally available. Subsequent Cargo commands never touch the network after a cargo fetch unless the lock file changes.
If the lock file is not available, then this command will generate the lock file before fetching the dependencies.
If −−target is not specified, then all target dependencies are fetched.
See also the cargo−prefetch <https://crates.io/crates/cargo−prefetch> plugin which adds a command to download popular crates. This may be useful if you plan to use Cargo without a network with the −−offline flag.
Fetch for the given architecture. The default is the host architecture. The general format of the triple is <arch><sub>−<vendor>−<sys>−<abi>. Run rustc −−print target−list for a list of supported targets.
This may also be specified with the build.target config value <https://doc.rust−lang.org/cargo/reference/config.html>.
Note that specifying this flag makes Cargo run in a different mode where the target artifacts are placed in a separate directory. See the build cache <https://doc.rust−lang.org/cargo/guide/build−cache.html> documentation for more details.
Use verbose output. May be specified twice for "very verbose" output which includes extra output such as dependency warnings and build script output. May also be specified with the term.verbose config value <https://doc.rust−lang.org/cargo/reference/config.html>.
No output printed to stdout.
Control when colored output is used. Valid values:
• auto (default): Automatically detect if color support is available on the terminal.
• always: Always display colors.
• never: Never display colors.
May also be specified with the term.color config value <https://doc.rust−lang.org/cargo/reference/config.html>.
Path to the Cargo.toml file. By default, Cargo searches for the Cargo.toml file in the current directory or any parent directory.
Either of these flags requires that the Cargo.lock file is up−to−date. If the lock file is missing, or it needs to be updated, Cargo will exit with an error. The −−frozen flag also prevents Cargo from attempting to access the network to determine if it is out−of−date.
These may be used in environments where you want to assert that the Cargo.lock file is up−to−date (such as a CI build) or want to avoid network access.
Prevents Cargo from accessing the network for any reason. Without this flag, Cargo will stop with an error if it needs to access the network and the network is not available. With this flag, Cargo will attempt to proceed without the network if possible.
Beware that this may result in different dependency resolution than online mode. Cargo will restrict itself to crates that are downloaded locally, even if there might be a newer version as indicated in the local copy of the index. See the cargo−fetch(1) command to download dependencies before going offline.
May also be specified with the net.offline config value <https://doc.rust−lang.org/cargo/reference/config.html>.
If Cargo has been installed with rustup, and the first argument to cargo begins with +, it will be interpreted as a rustup toolchain name (such as +stable or +nightly). See the rustup documentation <https://rust−lang.github.io/rustup/overrides.html> for more information about how toolchain overrides work.
Prints help information.
Unstable (nightly−only) flags to Cargo. Run cargo −Z help for details.
See the reference <https://doc.rust−lang.org/cargo/reference/environment−variables.html> for details on environment variables that Cargo reads.
• 0: Cargo succeeded.
• 101: Cargo failed to complete.
1. Fetch all dependencies:
cargo(1), cargo−update(1), cargo−generate−lockfile(1)