WIP

src/cli/self_update.rs

@@ -1186,7 +1186,7 @@ pub(crate) async fn prepare_update() -> Result<Option<PathBuf>> {
 
     // Download new version
     info!("downloading self-update");
-    utils::download_file(&download_url, &setup_path, None, &|_| ()).await?;
+    utils::download_file(&download_url, &setup_path, None, None).await?;
 
     // Mark as executable
     utils::make_executable(&setup_path)?;
@@ -1207,7 +1207,7 @@ async fn get_available_rustup_version() -> Result<String> {
     let release_file_url = format!("{update_root}/release-stable.toml");
     let release_file_url = utils::parse_url(&release_file_url)?;
     let release_file = tempdir.path().join("release-stable.toml");
-    utils::download_file(&release_file_url, &release_file, None, &|_| ()).await?;
+    utils::download_file(&release_file_url, &release_file, None, None).await?;
     let release_toml_str = utils::read_file("rustup release", &release_file)?;
     let release_toml: toml::Value =
         toml::from_str(&release_toml_str).context("unable to parse rustup release file")?;

src/cli/self_update/windows.rs

@@ -5,6 +5,7 @@ use std::io::Write;
 use std::os::windows::ffi::{OsStrExt, OsStringExt};
 use std::path::Path;
 use std::process::Command;
+use std::sync::Arc;
 
 use anyhow::{anyhow, Context, Result};
 
@@ -184,15 +185,15 @@ pub(crate) async fn try_install_msvc(opts: &InstallOpts<'_>) -> Result<ContinueI
     download_tracker.lock().unwrap().download_finished();
 
     info!("downloading Visual Studio installer");
-    utils::download_file(&visual_studio_url, &visual_studio, None, &move |n| {
+    let notify = Some(Arc::new(&move |n| {
         download_tracker
             .lock()
             .unwrap()
             .handle_notification(&crate::Notification::Install(
                 crate::dist::Notification::Utils(n),
             ));
-    })
-    .await?;
+    }));
+    utils::download_file(&visual_studio_url, &visual_studio, None, notify).await?;
 
     // Run the installer. Arguments are documented at:
     // https://docs.microsoft.com/en-us/visualstudio/install/use-command-line-parameters-to-install-visual-studio

src/config.rs

@@ -281,7 +281,7 @@ impl Cfg {
     /// construct a download configuration
     pub(crate) fn download_cfg<'a>(
         &'a self,
-        notify_handler: &'a dyn Fn(crate::dist::Notification<'_>),
+        notify_handler: Option<Arc<dyn Fn(crate::dist::Notification<'_>)>>,
     ) -> DownloadCfg<'a> {
         DownloadCfg {
             dist_root: &self.dist_root_url,

src/dist/dist.rs

@@ -699,9 +699,11 @@ pub(crate) async fn update_from_dist(
     .await;
 
     // Don't leave behind an empty / broken installation directory
-    if res.is_err() && fresh_install {
-        // FIXME Ignoring cascading errors
-        let _ = utils::remove_dir("toolchain", prefix.path(), download.notify_handler);
+    if let Some(notify_handler) = download.notify_handler {
+        if res.is_err() && fresh_install {
+            // FIXME Ignoring cascading errors
+            let _ = utils::remove_dir("toolchain", prefix.path(), notify_handler.as_ref());
+        }
     }
 
     res

src/dist/download.rs

@@ -1,6 +1,7 @@
 use std::fs;
 use std::ops;
 use std::path::{Path, PathBuf};
+use std::sync::Arc;
 
 use anyhow::{anyhow, Context, Result};
 use sha2::{Digest, Sha256};
@@ -13,12 +14,12 @@ use crate::utils::utils;
 
 const UPDATE_HASH_LEN: usize = 20;
 
-#[derive(Copy, Clone)]
+#[derive(Clone)]
 pub struct DownloadCfg<'a> {
     pub dist_root: &'a str,
     pub temp_cfg: &'a temp::Cfg,
     pub download_dir: &'a PathBuf,
-    pub notify_handler: &'a dyn Fn(Notification<'_>),
+    pub notify_handler: Option<Arc<dyn Fn(Notification<'_>)>>,
 }
 
 pub(crate) struct File {
@@ -42,7 +43,7 @@ impl<'a> DownloadCfg<'a> {
         utils::ensure_dir_exists(
             "Download Directory",
             self.download_dir,
-            &self.notify_handler,
+            self.notify_handler.as_ref(),
         )?;
         let target_file = self.download_dir.join(Path::new(hash));
 
@@ -76,7 +77,7 @@ impl<'a> DownloadCfg<'a> {
             &partial_file_path,
             Some(&mut hasher),
             true,
-            &|n| (self.notify_handler)(n.into()),
+            Some(Arc::new(|n| (self.notify_handler)(n.into()))),
         )
         .await
         {
@@ -171,7 +172,7 @@ impl<'a> DownloadCfg<'a> {
         let file = self.temp_cfg.new_file_with_ext("", ext)?;
 
         let mut hasher = Sha256::new();
-        utils::download_file(&url, &file, Some(&mut hasher), &|n| {
+        utils::download_file(&url, &file, Some(&mut hasher), |n| {
             (self.notify_handler)(n.into())
         })
         .await?;

src/dist/manifestation/tests.rs

@@ -447,7 +447,7 @@ fn update_from_dist(
         &manifest_url,
         &manifest_file,
         None,
-        &|_| {},
+        None,
     ))?;
     let manifest_str = utils::read_file("manifest", &manifest_file)?;
     let manifest = Manifest::parse(&manifest_str)?;

src/toolchain/distributable.rs

@@ -1,5 +1,6 @@
 use std::{
     convert::Infallible, env::consts::EXE_SUFFIX, ffi::OsStr, fs, path::Path, process::Command,
+    sync::Arc,
 };
 
 use anyhow::{anyhow, Context};
@@ -495,9 +496,10 @@ impl<'a> DistributableToolchain<'a> {
             remove_components: vec![component],
         };
 
-        let notify_handler =
-            &|n: crate::dist::Notification<'_>| (self.cfg.notify_handler)(n.into());
-        let download_cfg = self.cfg.download_cfg(&notify_handler);
+        let notify_handler = Some(Arc::new(&|n: crate::dist::Notification<'_>| {
+            (self.cfg.notify_handler)(n.into())
+        }));
+        let download_cfg = self.cfg.download_cfg(notify_handler);
 
         utils::run_future(manifestation.update(
             &manifest,

src/utils/utils.rs

@@ -3,6 +3,7 @@ use std::fs::{self, File};
 use std::future::Future;
 use std::io::{self, BufReader, Write};
 use std::path::{Path, PathBuf};
+use std::sync::Arc;
 
 use anyhow::{anyhow, bail, Context, Result};
 use home::env as home;
@@ -138,17 +139,17 @@ pub async fn download_file(
     url: &Url,
     path: &Path,
     hasher: Option<&mut Sha256>,
-    notify_handler: &dyn Fn(Notification<'_>),
+    notify_handler: Option<Arc<&dyn Fn(Notification<'_>)>>,
 ) -> Result<()> {
-    download_file_with_resume(url, path, hasher, false, &notify_handler).await
+    download_file_with_resume(url, path, hasher, false, notify_handler).await
 }
 
 pub(crate) async fn download_file_with_resume(
     url: &Url,
     path: &Path,
     hasher: Option<&mut Sha256>,
     resume_from_partial: bool,
-    notify_handler: &dyn Fn(Notification<'_>),
+    notify_handler: Option<Arc<&dyn Fn(Notification<'_>)>>,
 ) -> Result<()> {
     use download::DownloadError as DEK;
     match download_file_(url, path, hasher, resume_from_partial, notify_handler).await {
@@ -183,14 +184,16 @@ async fn download_file_(
     path: &Path,
     hasher: Option<&mut Sha256>,
     resume_from_partial: bool,
-    notify_handler: &dyn Fn(Notification<'_>),
+    notify_handler: Option<Arc<&dyn Fn(Notification<'_>)>>,
 ) -> Result<()> {
     use download::download_to_path_with_backend;
     use download::{Backend, Event, TlsBackend};
     use sha2::Digest;
     use std::cell::RefCell;
 
-    notify_handler(Notification::DownloadingFile(url, path));
+    notify_handler
+        .as_ref()
+        .map(|notify_handler| notify_handler(Notification::DownloadingFile(url, path)));
 
     let hasher = RefCell::new(hasher);
 
@@ -203,7 +206,7 @@ async fn download_file_(
             }
         }
 
-        match msg {
+        notify_handler.as_ref().map(|notify_handler| match msg {
             Event::DownloadContentLengthReceived(len) => {
                 notify_handler(Notification::DownloadContentLengthReceived(len));
             }
@@ -213,7 +216,7 @@ async fn download_file_(
             Event::ResumingPartialDownload => {
                 notify_handler(Notification::ResumingPartialDownload);
             }
-        }
+        });
 
         Ok(())
     };
@@ -240,12 +243,14 @@ async fn download_file_(
         };
         (Backend::Reqwest(tls_backend), Notification::UsingReqwest)
     };
-    notify_handler(notification);
+    notify_handler
+        .as_ref()
+        .map(|notify_handler| notify_handler(notification));
     let res =
         download_to_path_with_backend(backend, url, path, resume_from_partial, Some(callback))
             .await;
 
-    notify_handler(Notification::DownloadFinished);
+    notify_handler.map(|notify_handler| notify_handler(Notification::DownloadFinished));
 
     res
 }