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bootstrap: improve channel handling #139574

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Apr 11, 2025
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2 changes: 1 addition & 1 deletion src/bootstrap/defaults/bootstrap.dist.toml
Original file line number Diff line number Diff line change
Expand Up @@ -15,7 +15,7 @@ download-ci-llvm = false
[rust]
# We have several defaults in bootstrap that depend on whether the channel is `dev` (e.g. `omit-git-hash` and `download-ci-llvm`).
# Make sure they don't get set when installing from source.
channel = "nightly"
channel = "auto-detect"
# Never download a rustc, distributions must build a fresh compiler.
download-rustc = false
lld = true
Expand Down
33 changes: 18 additions & 15 deletions src/bootstrap/src/core/config/config.rs
Original file line number Diff line number Diff line change
Expand Up @@ -1540,9 +1540,6 @@ impl Config {
}
}

let file_content = t!(fs::read_to_string(config.src.join("src/ci/channel")));
let ci_channel = file_content.trim_end();

// Give a hard error if `--config` or `RUST_BOOTSTRAP_CONFIG` are set to a missing path,
// but not if `bootstrap.toml` hasn't been created.
let mut toml = if !using_default_path || toml_path.exists() {
Expand Down Expand Up @@ -1847,17 +1844,21 @@ impl Config {
let mut lld_enabled = None;
let mut std_features = None;

let is_user_configured_rust_channel =
if let Some(channel) = toml.rust.as_ref().and_then(|r| r.channel.clone()) {
if channel == "auto-detect" {
config.channel = ci_channel.into();
} else {
config.channel = channel;
}
let file_content = t!(fs::read_to_string(config.src.join("src/ci/channel")));
let ci_channel = file_content.trim_end();

let toml_channel = toml.rust.as_ref().and_then(|r| r.channel.clone());
let is_user_configured_rust_channel = match toml_channel {
Some(channel) if channel == "auto-detect" => {
config.channel = ci_channel.into();
true
} else {
false
};
}
Some(channel) => {
config.channel = channel;
true
}
None => false,
};

let default = config.channel == "dev";
config.omit_git_hash = toml.rust.as_ref().and_then(|r| r.omit_git_hash).unwrap_or(default);
Expand All @@ -1882,6 +1883,10 @@ impl Config {
&& config.src.join(".cargo/config.toml").exists(),
);

if !is_user_configured_rust_channel && config.rust_info.is_from_tarball() {
config.channel = ci_channel.into();
}

if let Some(rust) = toml.rust {
let Rust {
optimize: optimize_toml,
Expand Down Expand Up @@ -2085,8 +2090,6 @@ impl Config {

config.channel = channel;
}
} else if config.rust_info.is_from_tarball() && !is_user_configured_rust_channel {
ci_channel.clone_into(&mut config.channel);
}

if let Some(llvm) = toml.llvm {
Expand Down
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