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-rw-r--r--lib/rubygems/remote_fetcher.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/rubygems/remote_fetcher.rb b/lib/rubygems/remote_fetcher.rb
index c6816e8f0f..e32c024989 100644
--- a/lib/rubygems/remote_fetcher.rb
+++ b/lib/rubygems/remote_fetcher.rb
@@ -292,6 +292,7 @@ class Gem::RemoteFetcher
if update and path then
open(path, 'wb') do |io|
+ io.flock(File::LOCK_EX)
io.write data
end
end