Update force_update param in install_from_dist calls in config.rs

Author: BeniCheni

src/config.rs

@@ -317,7 +317,7 @@ impl Cfg {
                             ErrorKind::OverrideToolchainNotInstalled(name.to_string())
                         })
                     } else {
-                        toolchain.install_from_dist(false, &[], &[])?;
+                        toolchain.install_from_dist(true, &[], &[])?;
                         Ok(Some((toolchain, reason)))
                     }
                 }
@@ -478,7 +478,7 @@ impl Cfg {
     ) -> Result<Command> {
         let toolchain = self.get_toolchain(toolchain, false)?;
         if install_if_missing && !toolchain.exists() {
-            toolchain.install_from_dist(false, &[], &[])?;
+            toolchain.install_from_dist(true, &[], &[])?;
         }
 
         if let Some(cmd) = self.maybe_do_cargo_fallback(&toolchain, binary)? {

tests/cli-misc.rs

@@ -905,3 +905,67 @@ fn which() {
         );
     });
 }
+
+#[test]
+fn install_toolchain_by_rustup_run_with_install_flag() {
+    setup(&|config| {
+        expect_ok(config, &["rustup", "toolchain", "remove", "nightly"]);
+        expect_ok_ex(
+            config,
+            &[
+                "rustup",
+                "run",
+                "--install",
+                "nightly",
+                "rustc",
+                "--version",
+            ],
+            "1.3.0 (hash-nightly-2)
+",
+            for_host!(
+                r"info: syncing channel updates for 'nightly-{0}'
+info: latest update on 2015-01-02, rust version 1.3.0 (hash-nightly-2)
+info: downloading component 'cargo'
+info: downloading component 'rust-docs'
+info: downloading component 'rust-std'
+info: downloading component 'rustc'
+info: installing component 'cargo'
+info: installing component 'rust-docs'
+info: installing component 'rust-std'
+info: installing component 'rustc'
+"
+            ),
+        );
+    });
+}
+
+#[test]
+fn install_toolchain_by_rustup_default_with_toolchain_arg() {
+    setup(&|config| {
+        expect_ok(config, &["rustup", "toolchain", "remove", "nightly"]);
+        expect_ok_ex(
+            config,
+            &["rustup", "default", "nightly"],
+            for_host!(
+                r"
+  nightly-{0} installed - 1.3.0 (hash-nightly-2)
+
+"
+            ),
+            for_host!(
+                r"info: syncing channel updates for 'nightly-{0}'
+info: latest update on 2015-01-02, rust version 1.3.0 (hash-nightly-2)
+info: downloading component 'cargo'
+info: downloading component 'rust-docs'
+info: downloading component 'rust-std'
+info: downloading component 'rustc'
+info: installing component 'cargo'
+info: installing component 'rust-docs'
+info: installing component 'rust-std'
+info: installing component 'rustc'
+info: default toolchain set to 'nightly-{0}'
+"
+            ),
+        );
+    });
+}