Reopen file even when copying instead of linking (#2545)

lib/paperclip/io_adapters/abstract_adapter.rb

@@ -57,15 +57,16 @@ module Paperclip
     end
 
     def link_or_copy_file(src, dest)
-      Paperclip.log("Trying to link #{src} to #{dest}")
-      FileUtils.ln(src, dest, force: true) # overwrite existing
-      @destination.close
-      @destination.open.binmode
-    rescue Errno::EXDEV, Errno::EPERM, Errno::ENOENT, Errno::EEXIST => e
-      Paperclip.log(
-        "Link failed with #{e.message}; copying link #{src} to #{dest}"
-      )
-      FileUtils.cp(src, dest)
+      begin
+        Paperclip.log("Trying to link #{src} to #{dest}")
+        FileUtils.ln(src, dest, force: true) # overwrite existing
+      rescue Errno::EXDEV, Errno::EPERM, Errno::ENOENT, Errno::EEXIST => e
+        Paperclip.log(
+          "Link failed with #{e.message}; copying link #{src} to #{dest}"
+        )
+        FileUtils.cp(src, dest)
+      end
+
       @destination.close
       @destination.open.binmode
     end

spec/paperclip/io_adapters/abstract_adapter_spec.rb

@@ -93,6 +93,34 @@ describe Paperclip::AbstractAdapter do
     end
   end
 
+  context "#copy_to_tempfile" do
+    around do |example|
+      FileUtils.module_eval do
+        class << self
+          alias paperclip_ln ln
+
+          def ln(*)
+            raise Errno::EXDEV
+          end
+        end
+      end
+
+      example.run
+
+      FileUtils.module_eval do
+        class << self
+          alias ln paperclip_ln
+          undef paperclip_ln
+        end
+      end
+    end
+
+    it "should return a readable file even when linking fails" do
+      src = open(fixture_file("5k.png"), "rb")
+      expect(subject.send(:copy_to_tempfile, src).read).to eq src.read
+    end
+  end
+
   context "#original_filename=" do
     it "should not fail with a nil original filename" do
       expect { subject.original_filename = nil }.not_to raise_error