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Improve performance - skip manifest read if no components/targets requested #2917

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Improve performance - skip manifest read if no components/targets requested #2917

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15 changes: 6 additions & 9 deletions src/config.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -736,7 +736,9 @@ impl Cfg {
components: &[&str],
targets: &[&str],
) -> Result<bool> {
let components_requested = !components.is_empty() || !targets.is_empty();
if components.is_empty() && targets.is_empty() {
return Ok(true);
}
// If we're here, the toolchain exists on disk and is a dist toolchain
// so we should attempt to load its manifest
let desc = if let Some(desc) = distributable.get_toolchain_desc_with_manifest()? {
Expand All @@ -747,11 +749,8 @@ impl Cfg {
// at re-fetching the manifest to try again.
return Ok(distributable.guess_v1_manifest());
};
match (desc.list_components(), components_requested) {
// If the toolchain does not support components but there were components requested, bubble up the error
(Err(e), true) => Err(e),
// Otherwise check if all the components we want are installed
(Ok(installed_components), _) => Ok(components.iter().all(|name| {
let installed_components = desc.list_components()?;
Ok(components.iter().all(|name| {
installed_components.iter().any(|status| {
let cname = status.component.short_name(&desc.manifest);
let cname = cname.as_str();
Expand All @@ -769,9 +768,7 @@ impl Cfg {
let ctarg = status.component.target();
(ctarg == *name) && status.installed
})
})),
_ => Ok(true),
}
}))
}

if let Some((toolchain, components, targets, reason, profile)) =
Expand Down