cargo/ops/
cargo_fetch.rs

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1use crate::core::compiler::standard_lib;
2use crate::core::compiler::{BuildConfig, CompileMode, RustcTargetData};
3use crate::core::{PackageSet, Resolve, Workspace};
4use crate::ops;
5use crate::util::context::JobsConfig;
6use crate::util::CargoResult;
7use crate::util::GlobalContext;
8use std::collections::HashSet;
9
10pub struct FetchOptions<'a> {
11    pub gctx: &'a GlobalContext,
12    /// The target arch triple to fetch dependencies for
13    pub targets: Vec<String>,
14}
15
16/// Executes `cargo fetch`.
17pub fn fetch<'a>(
18    ws: &Workspace<'a>,
19    options: &FetchOptions<'a>,
20) -> CargoResult<(Resolve, PackageSet<'a>)> {
21    ws.emit_warnings()?;
22    let dry_run = false;
23    let (mut packages, resolve) = ops::resolve_ws(ws, dry_run)?;
24
25    let jobs = Some(JobsConfig::Integer(1));
26    let keep_going = false;
27    let gctx = ws.gctx();
28    let build_config =
29        BuildConfig::new(gctx, jobs, keep_going, &options.targets, CompileMode::Build)?;
30    let mut data = RustcTargetData::new(ws, &build_config.requested_kinds)?;
31    let mut fetched_packages = HashSet::new();
32    let mut deps_to_fetch = ws.members().map(|p| p.package_id()).collect::<Vec<_>>();
33    let mut to_download = Vec::new();
34
35    while let Some(id) = deps_to_fetch.pop() {
36        if !fetched_packages.insert(id) {
37            continue;
38        }
39
40        to_download.push(id);
41        let deps = resolve
42            .deps(id)
43            .filter(|&(_id, deps)| {
44                deps.iter().any(|d| {
45                    // If no target was specified then all dependencies are
46                    // fetched.
47                    if options.targets.is_empty() {
48                        return true;
49                    }
50
51                    // Otherwise we only download this dependency if any of the
52                    // requested platforms would match this dependency. Note
53                    // that this is a bit lossy because not all dependencies are
54                    // always compiled for all platforms, but it should be
55                    // "close enough" for now.
56                    build_config
57                        .requested_kinds
58                        .iter()
59                        .any(|kind| data.dep_platform_activated(d, *kind))
60                })
61            })
62            .map(|(id, _deps)| id);
63        deps_to_fetch.extend(deps);
64    }
65
66    // If -Zbuild-std was passed, download dependencies for the standard library.
67    if let Some(crates) = &gctx.cli_unstable().build_std {
68        let (std_package_set, _, _) = standard_lib::resolve_std(
69            ws,
70            &mut data,
71            &build_config,
72            crates,
73            &build_config.requested_kinds,
74        )?;
75        packages.add_set(std_package_set);
76    }
77
78    packages.get_many(to_download)?;
79    crate::core::gc::auto_gc(gctx);
80
81    Ok((resolve, packages))
82}
cargo/ops/cargo_fetch.rs

cargo/ops/
cargo_fetch.rs
