From e608ae1d10fcee44f7b59c369453cc1f795adcd6 Mon Sep 17 00:00:00 2001
From: Chad Austin <chadaustin@fb.com>
Date: Thu, 3 Feb 2022 11:44:47 -0800
Subject: [PATCH] prefetch projects in the background

Summary:
There's no reason to block a getdeps build on prefetching its sources,
so issue all prefetches in the background.

Reviewed By: genevievehelsel

Differential Revision: D33855396

fbshipit-source-id: 1ba01b0587e9bc0e74e6bba5b8571af76bf2516d
---
 build/fbcode_builder/getdeps/copytree.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/build/fbcode_builder/getdeps/copytree.py b/build/fbcode_builder/getdeps/copytree.py
index bcec12f5c..328ab84b9 100644
--- a/build/fbcode_builder/getdeps/copytree.py
+++ b/build/fbcode_builder/getdeps/copytree.py
@@ -59,7 +59,9 @@ def prefetch_dir_if_eden(dirpath):
         return
     glob = f"{os.path.relpath(dirpath, root).replace(os.sep, '/')}/**"
     print(f"Prefetching {glob}")
-    subprocess.call(["edenfsctl", "prefetch", "--repo", root, "--silent", glob])
+    subprocess.call(
+        ["edenfsctl", "prefetch", "--repo", root, "--silent", glob, "--background"]
+    )
     PREFETCHED_DIRS.add(dirpath)