Bail when override toolchain is not installed (#652)

src/fuelup_cli.rs

@@ -7,9 +7,15 @@ use crate::commands::{
     toolchain::{self, ToolchainCommand},
     upgrade::{self, UpgradeCommand},
 };
-use crate::ops::{fuelup_show, fuelup_update};
-use anyhow::Result;
+use crate::{
+    ops::{fuelup_show, fuelup_update},
+    toolchain::{DistToolchainDescription, Toolchain},
+    toolchain_override::ToolchainOverride,
+};
+use anyhow::{bail, Result};
 use clap::Parser;
+use std::str::FromStr;
+use tracing::info;
 
 #[derive(Debug, Parser)]
 #[clap(name = "fuelup", about = "Fuel Toolchain Manager", version)]
@@ -46,6 +52,26 @@ enum Commands {
 pub fn fuelup_cli() -> Result<()> {
     let cli = Cli::parse();
 
+    if let Some(toolchain_override) = ToolchainOverride::from_project_root() {
+        let override_path = toolchain_override.cfg.toolchain.channel.to_string();
+        let toolchain = match DistToolchainDescription::from_str(&override_path) {
+            Ok(desc) => Toolchain::from_path(&desc.to_string()),
+            Err(_) => Toolchain::from_path(&override_path),
+        };
+
+        info!("Using override toolchain '{}'", &toolchain.name);
+
+        if !toolchain.exists() {
+            match cli.command {
+                Commands::Toolchain(_) => {},
+                _ => bail!(
+                    "Override toolchain is not installed. Please run: 'fuelup toolchain install {}'",
+                    &toolchain.name,
+                )
+            }
+        }
+    }
+
     match cli.command {
         Commands::Check(command) => check::exec(command),
         Commands::Completions(command) => completions::exec(command),