fix where ib file can get an md5 after first scan

app/jobs/domain/inkbunny/job/update_posts_job.rb

@@ -174,19 +174,35 @@ class Domain::Inkbunny::Job::UpdatePostsJob < Domain::Inkbunny::Job::Base
           logger.error("file has no md5") if md5_initial.blank?
 
           file = post_files_by_ib_id[ib_file_id]
-          if file.present? && (file.md5_initial != md5_initial)
+          if file.present? && file.md5_initial.present? &&
+               (file.md5_initial != md5_initial)
             fatal_error(
-              "md5_initial changed #{file.md5_initial} -> #{md5_initial}",
+              format_tags(
+                make_tag("old md5", file.md5_initial),
+                make_tag("new md5", md5_initial),
+                "md5_initial changed",
+              ),
             )
-          elsif file.present?
-            logger.info("file already exists, skipping")
+          elsif file.present? && file.md5_initial.present?
+            logger.info(format_tags("file already exists, skipping"))
             next
+          elsif file.present? && file.md5_initial.blank? && md5_initial.present?
+            logger.warn(
+              format_tags(
+                make_tag("md5", md5_initial),
+                "file got its first (delayed) md5_initial",
+              ),
+            )
+            file.md5_initial = md5_initial
+            file.state_ok!
+          elsif file.present?
+            fatal_error("invariant")
           end
 
           # We create all files, even those with null MD5 sums (which also do not have
           # a valid download URL), so that post.files.count will be accurate and match
           # pagecount.
-          file =
+          file ||=
             post.files.create do |file|
               md5_initial.present? ? file.state_ok! : file.state_terminal_error!
               file.ib_id = ib_file_id
@@ -207,7 +223,9 @@ class Domain::Inkbunny::Job::UpdatePostsJob < Domain::Inkbunny::Job::Base
             end
 
           if file.state_terminal_error?
-            logger.error "file is in terminal error state, skipping enqueue"
+            logger.error(
+              format_tags("file is in terminal error state, skipping enqueue"),
+            )
             next
           end
 
@@ -215,7 +233,7 @@ class Domain::Inkbunny::Job::UpdatePostsJob < Domain::Inkbunny::Job::Base
             fatal_error "file is invalid: #{format_tags_arr(file.errors.full_messages)}"
           end
 
-          logger.info "created new file"
+          logger.info format_tags("created new file")
 
           defer_job(
             Domain::Inkbunny::Job::StaticFileJob,

spec/jobs/domain/inkbunny/job/update_posts_job_spec.rb

@@ -123,6 +123,41 @@ describe Domain::Inkbunny::Job::UpdatePostsJob do
       )
     end
 
+    it "enqueues file jobs when file first gets an md5_initial" do
+      file =
+        post_3104202.files.create(
+          ib_id: 4_652_537,
+          state: "terminal_error",
+          md5_initial: "",
+        )
+      file.save!
+
+      perform_now({ ib_post_ids: ib_post_ids, caused_by_entry: nil })
+
+      file.reload
+      expect(file.md5_initial).to eq("fbeb553c483a346108beeada93d90086")
+      expect(file.state).to eq("ok")
+      expect(
+        SpecUtil.enqueued_job_args(Domain::Inkbunny::Job::StaticFileJob),
+      ).to include({ file:, caused_by_entry: log_entries[0] })
+    end
+
+    it "throws an error when the md5_initial changes" do
+      file =
+        post_3104202.files.create!(
+          ib_id: 4_652_537,
+          state: "ok",
+          md5_initial: "12345",
+        )
+
+      perform_now(
+        { ib_post_ids: ib_post_ids, caused_by_entry: nil },
+        should_raise: /md5_initial changed/,
+      )
+
+      expect(file.reload.md5_initial).to eq("12345")
+    end
+
     it "updates posts with detailed information" do
       perform_now({ ib_post_ids: ib_post_ids, caused_by_entry: nil })