From e307f047a00a0f1a8da490d68125c3c0ea45fc8b Mon Sep 17 00:00:00 2001
From: Alex Crichton <alex@alexcrichton.com>
Date: Fri, 2 Nov 2018 07:07:48 -0700
Subject: [PATCH] Pass `--update-head-ok` when fetching via git CLI

Discovered in a recent [comment] it looks like not passing this may
cause the git CLI to fail in some situations.

[comment]: https://github.com/rust-lang/cargo/issues/2078#issuecomment-435333292
---
 src/cargo/sources/git/utils.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/cargo/sources/git/utils.rs b/src/cargo/sources/git/utils.rs
index 66301c1da1b..65ae5db2702 100644
--- a/src/cargo/sources/git/utils.rs
+++ b/src/cargo/sources/git/utils.rs
@@ -755,6 +755,7 @@ fn fetch_with_cli(
     cmd.arg("fetch")
         .arg("--tags") // fetch all tags
         .arg("--quiet")
+        .arg("--update-head-ok") // see discussion in #2078
         .arg(url.to_string())
         .arg(refspec)
         .cwd(repo.path());