From b83ef97efb5d8d2a0d15f3dcd84f3f5d65a98193 Mon Sep 17 00:00:00 2001
From: Eh2406 <YeomanYaacov@gmail.com>
Date: Tue, 30 Jan 2018 23:09:13 -0500
Subject: [PATCH] add a -Z no-index-update for crater and benchmarking

---
 src/cargo/core/features.rs           | 2 ++
 src/cargo/sources/registry/remote.rs | 3 +++
 2 files changed, 5 insertions(+)

diff --git a/src/cargo/core/features.rs b/src/cargo/core/features.rs
index 3add03fcc..414e6a4a8 100644
--- a/src/cargo/core/features.rs
+++ b/src/cargo/core/features.rs
@@ -233,6 +233,7 @@ pub struct CliUnstable {
     pub print_im_a_teapot: bool,
     pub unstable_options: bool,
     pub offline: bool,
+    pub no_index_update: bool,
 }
 
 impl CliUnstable {
@@ -264,6 +265,7 @@ impl CliUnstable {
             "print-im-a-teapot" => self.print_im_a_teapot = parse_bool(v)?,
             "unstable-options" => self.unstable_options = true,
             "offline" => self.offline = true,
+            "no-index-update" => self.no_index_update = true,
             _ => bail!("unknown `-Z` flag specified: {}", k),
         }
 
diff --git a/src/cargo/sources/registry/remote.rs b/src/cargo/sources/registry/remote.rs
index f21e54fa5..5ffabb9d5 100644
--- a/src/cargo/sources/registry/remote.rs
+++ b/src/cargo/sources/registry/remote.rs
@@ -156,6 +156,9 @@ impl<'cfg> RegistryData for RemoteRegistry<'cfg> {
         if self.config.cli_unstable().offline {
             return Ok(());
         }
+        if self.config.cli_unstable().no_index_update {
+            return Ok(());
+        }
 
         // Ensure that we'll actually be able to acquire an HTTP handle later on
         // once we start trying to download crates. This will weed out any
-- 
2.30.2