FIX: Avoid infinite loop if disk space is low

We now continue to enqueue the pull_hotlinked_images job for optimized images, even if disk space is low

lib/cooked_post_processor.rb

@@ -627,7 +627,7 @@ def enforce_nofollow
 
   def pull_hotlinked_images(bypass_bump = false)
     # have we enough disk space?
-    return if disable_if_low_on_disk_space
+    disable_if_low_on_disk_space # But still enqueue the job
     # don't download remote images for posts that are more than n days old
     return unless @post.created_at > (Date.today - SiteSetting.download_remote_images_max_days_old)
     # we only want to run the job whenever it's changed by a user
@@ -640,6 +640,7 @@ def pull_hotlinked_images(bypass_bump = false)
   end
 
   def disable_if_low_on_disk_space
+    return false if !SiteSetting.download_remote_images_to_local
     return false if available_disk_space >= SiteSetting.download_remote_images_threshold
 
     SiteSetting.download_remote_images_to_local = false

spec/components/cooked_post_processor_spec.rb

@@ -1094,10 +1094,10 @@
         SiteSetting.download_remote_images_to_local = true
       end
 
-      it "does not run when there is not enough disk space" do
-        cpp.expects(:disable_if_low_on_disk_space).returns(true)
-        Jobs.expects(:cancel_scheduled_job).never
+      it "disables download_remote_images if there is not enough disk space" do
+        cpp.expects(:available_disk_space).returns(5)
         cpp.pull_hotlinked_images
+        expect(SiteSetting.download_remote_images_to_local).to eq(false)
       end
 
       context "and there is enough disk space" do
@@ -1136,11 +1136,14 @@
     let(:post) { build(:post, created_at: 20.days.ago) }
     let(:cpp) { CookedPostProcessor.new(post) }
 
-    before { cpp.expects(:available_disk_space).returns(50) }
+    before do
+      SiteSetting.download_remote_images_to_local = true
+      cpp.expects(:available_disk_space).returns(50)
+    end
 
     it "does nothing when there's enough disk space" do
       SiteSetting.expects(:download_remote_images_threshold).returns(20)
-      SiteSetting.expects(:download_remote_images_to_local).never
+      SiteSetting.expects(:download_remote_images_to_local=).never
       expect(cpp.disable_if_low_on_disk_space).to eq(false)
     end