From 4d1a4100a89341250d988258a01a3c69d40db284 Mon Sep 17 00:00:00 2001
From: Ken Collins <ken@metaskills.net>
Date: Mon, 26 Apr 2021 19:05:24 -0400
Subject: [PATCH 1/2] Ignore Read-Only Filesystems

---
 lib/bootsnap/load_path_cache/store.rb | 1 +
 test/load_path_cache/store_test.rb    | 6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/lib/bootsnap/load_path_cache/store.rb b/lib/bootsnap/load_path_cache/store.rb
index 4e0c2a91..835daee5 100644
--- a/lib/bootsnap/load_path_cache/store.rb
+++ b/lib/bootsnap/load_path_cache/store.rb
@@ -91,6 +91,7 @@ def dump_data
         FileUtils.mv(tmp, @store_path)
       rescue Errno::EEXIST
         retry
+      rescue Errno::EROFS
       end
     end
   end
diff --git a/test/load_path_cache/store_test.rb b/test/load_path_cache/store_test.rb
index b70792d0..74e23544 100644
--- a/test/load_path_cache/store_test.rb
+++ b/test/load_path_cache/store_test.rb
@@ -74,6 +74,12 @@ def test_retry_on_collision
 
         store.transaction { store.set('a', 1) }
       end
+
+      def test_ignore_read_only_filesystem
+        MessagePack.expects(:dump).raises(Errno::EROFS.new("Read-only file system @ rb_sysopen"))
+        store.transaction { store.set('a', 1) }
+        refute(File.exist?(@path))
+      end
     end
   end
 end

From 4ccccfc9490deebceabda1c1f56d6c24b6eb9ec2 Mon Sep 17 00:00:00 2001
From: Ken Collins <ken@metaskills.net>
Date: Tue, 27 Apr 2021 08:02:50 -0400
Subject: [PATCH 2/2] Use SystemCallError vs Errno::EROFS

---
 lib/bootsnap/load_path_cache/store.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/bootsnap/load_path_cache/store.rb b/lib/bootsnap/load_path_cache/store.rb
index 835daee5..5f5e9fa2 100644
--- a/lib/bootsnap/load_path_cache/store.rb
+++ b/lib/bootsnap/load_path_cache/store.rb
@@ -91,7 +91,7 @@ def dump_data
         FileUtils.mv(tmp, @store_path)
       rescue Errno::EEXIST
         retry
-      rescue Errno::EROFS
+      rescue SystemCallError
       end
     end
   end