From eeddaaea52a554f812a841dc14666970169fc778 Mon Sep 17 00:00:00 2001
From: "Adam J. Stewart" <ajstewart426@gmail.com>
Date: Thu, 28 Jan 2021 13:41:05 -0600
Subject: [PATCH] Make git fetching even quieter (for git v1.7.2+)(#21013)

---
 lib/spack/spack/fetch_strategy.py | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/lib/spack/spack/fetch_strategy.py b/lib/spack/spack/fetch_strategy.py
index b67db24c72..28f1a87c17 100644
--- a/lib/spack/spack/fetch_strategy.py
+++ b/lib/spack/spack/fetch_strategy.py
@@ -776,6 +776,12 @@ def git(self):
         if not self._git:
             self._git = which('git', required=True)
 
+            # Disable advice for a quieter fetch
+            # https://github.com/git/git/blob/master/Documentation/RelNotes/1.7.2.txt
+            if self.git_version >= Version('1.7.2'):
+                self._git.add_default_arg('-c')
+                self._git.add_default_arg('advice.detachedHead=false')
+
             # If the user asked for insecure fetching, make that work
             # with git as well.
             if not spack.config.get('config:verify_ssl'):