Add message in case it's already up-to-date

src/cli/rustup_mode.rs

@@ -98,7 +98,7 @@ pub fn main() -> Result<()> {
         ("doc", Some(m)) => doc(cfg, m)?,
         ("man", Some(m)) => man(cfg, m)?,
         ("self", Some(c)) => match c.subcommand() {
-            ("update", Some(_)) => self_update::update()?,
+            ("update", Some(_)) => self_update::update(cfg)?,
             ("uninstall", Some(m)) => self_uninstall(m)?,
             (_, _) => unreachable!(),
         },

src/cli/self_update.rs

@@ -34,6 +34,7 @@ use crate::common::{self, Confirm};
 use crate::errors::*;
 use crate::markdown::md;
 use crate::term2;
+use rustup::{Cfg, UpdateStatus};
 use rustup::dist::dist::{self, Profile, TargetTriple};
 use rustup::utils::utils;
 use rustup::utils::Notification;
@@ -1414,7 +1415,7 @@ fn do_remove_from_path(methods: &[PathUpdateMethod]) -> Result<()> {
 /// (and on windows this process will not be running to do it),
 /// rustup-init is stored in `CARGO_HOME`/bin, and then deleted next
 /// time rustup runs.
-pub fn update() -> Result<()> {
+pub fn update(cfg: &Cfg) -> Result<()> {
     use common::SelfUpdatePermission::*;
     let update_permitted = if NEVER_SELF_UPDATE {
         HardFail
@@ -1435,21 +1436,25 @@ pub fn update() -> Result<()> {
         Permit => {}
     }
 
-    let setup_path = prepare_update()?;
-    if let Some(ref p) = setup_path {
-        let version = match get_new_rustup_version(p) {
-            Some(new_version) => parse_new_rustup_version(new_version),
-            None => {
-                err!("failed to get rustup version");
-                process::exit(1);
-            }
-        };
+    match prepare_update() {
+        Ok(Some(ref setup_path)) => {
+            let version = match get_new_rustup_version(setup_path) {
+                Some(new_version) => parse_new_rustup_version(new_version),
+                None => {
+                    err!("failed to get rustup version");
+                    process::exit(1);
+                }
+            };
 
-        info!("rustup updated successfully to {}", version);
-        run_update(p)?;
-    } else {
-        // Try again in case we emitted "tool `{}` is already installed" last time.
-        install_proxies()?
+            let _ = common::show_channel_update(cfg, "rustup", Ok(UpdateStatus::Updated(version)));
+            run_update(setup_path)?;
+        }
+        Ok(None) => {
+            let _ = common::show_channel_update(cfg, "rustup", Ok(UpdateStatus::Unchanged));
+            // Try again in case we emitted "tool `{}` is already installed" last time.
+            install_proxies()?
+        }
+        Err(e) => common::show_channel_update(cfg, "rustup", Err(rustup::ErrorKind::Generic(e.to_string()).into()))?,
     }
 
     Ok(())

src/errors.rs

@@ -362,6 +362,10 @@ error_chain! {
         BrokenPartialFile {
             description("partially downloaded file may have been damaged and was removed, please try again")
         }
+        Generic(v: String) {
+            description("generic error")
+            display("encountered error: {}", v)
+        }
     }
 }
 

tests/cli-self-upd.rs

@@ -699,6 +699,7 @@ fn update_no_change() {
             &["rustup", "self", "update"],
             r"",
             r"info: checking for self-updates
+info: already up-to-date
 ",
         );
     });