Merge pull request #573 from brson/fallback

Fallback to old download methods if server returns 403

Author: alexcrichton

src/rustup-dist/src/dist.rs

@@ -518,7 +518,7 @@ pub fn update_from_dist<'a>(download: DownloadCfg<'a>,
             }
         }
         Ok(None) => return Ok(None),
-        Err(Error(ErrorKind::Utils(::rustup_utils::ErrorKind::Download404 { .. }), _)) => {
+        Err(Error(ErrorKind::Utils(::rustup_utils::ErrorKind::DownloadNotExists { .. }), _)) => {
             // Proceed to try v1 as a fallback
             (download.notify_handler)(Notification::DownloadingLegacyManifest);
         }
@@ -528,7 +528,7 @@ pub fn update_from_dist<'a>(download: DownloadCfg<'a>,
     // If the v2 manifest is not found then try v1
     let manifest = match dl_v1_manifest(download, toolchain) {
         Ok(m) => m,
-        Err(Error(ErrorKind::Utils(rustup_utils::ErrorKind::Download404 { .. }), _)) => {
+        Err(Error(ErrorKind::Utils(rustup_utils::ErrorKind::DownloadNotExists { .. }), _)) => {
             return Err(format!("no release found for '{}'", toolchain.manifest_name()).into());
         }
         Err(e @ Error(ErrorKind::ChecksumFailed { .. }, _)) => {
@@ -547,7 +547,7 @@ pub fn update_from_dist<'a>(download: DownloadCfg<'a>,
                                   download.notify_handler.clone()) {
         Ok(None) => Ok(None),
         Ok(Some(hash)) => Ok(Some(hash)),
-        e @ Err(Error(ErrorKind::Utils(rustup_utils::ErrorKind::Download404 { .. }), _)) => {
+        e @ Err(Error(ErrorKind::Utils(rustup_utils::ErrorKind::DownloadNotExists { .. }), _)) => {
             e.chain_err(|| {
                 format!("could not download nonexistent rust version `{}`",
                         toolchain_str)

src/rustup-utils/src/errors.rs

@@ -81,7 +81,7 @@ error_chain! {
             description("could not download file")
             display("could not download file from '{}' to '{}", url, path.display())
         }
-        Download404 {
+        DownloadNotExists {
             url: Url,
             path: PathBuf,
         } {

src/rustup-utils/src/utils.rs

@@ -150,11 +150,13 @@ pub fn download_file(url: &Url,
         Err(e) => {
             let is404 = match e.kind() {
                 &ErrorKind::Download(DEK::HttpStatus(404)) => true,
+                // 403 is what static.rlo returns for bogus URLs as of 2016/07/11
+                &ErrorKind::Download(DEK::HttpStatus(403)) => true,
                 &ErrorKind::Download(DEK::FileNotFound) => true,
                 _ => false
             };
             Err(e).chain_err(|| if is404 {
-                ErrorKind::Download404 {
+                ErrorKind::DownloadNotExists {
                     url: url.clone(),
                     path: path.to_path_buf(),
                 }