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cli: prompt user to install stable toolchain when environment is empty #4902

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cli: prompt user to install stable toolchain when environment is empty #4902

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18 changes: 18 additions & 0 deletions src/cli/rustup_mode.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -675,6 +675,24 @@ pub async fn main(
)?;
cfg.toolchain_override = matches.plus_toolchain;

let is_install_cmd = match &subcmd {
RustupSubcmd::Install { .. } => true,
RustupSubcmd::Toolchain { subcmd } => {
matches!(subcmd, ToolchainSubcmd::Install { .. })
}
_ => false,
};

if !is_install_cmd && cfg.list_toolchains()?.is_empty() && cfg.find_default()?.is_none() {
use std::io::Write;
let mut stderr = cfg.process.stderr().lock();
writeln!(stderr, "info: no toolchains installed")?;
writeln!(
stderr,
"hint: run 'rustup toolchain install stable' to install the default toolchain"
)?;
}

match subcmd {
RustupSubcmd::DumpTestament => common::dump_testament(process),
RustupSubcmd::Install { opts } => update(cfg, opts, true).await,
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