Adds 'pack 1 unresolved delta' to the list of failure modes

Gemfile.lock

@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    git-fastclone (1.2.5)
+    git-fastclone (1.2.6)
       colorize
       terrapin (~> 0.6.0)
 

lib/git-fastclone.rb

@@ -356,7 +356,7 @@ def with_git_mirror(url)
             'fatal: missing blob object',
             'fatal: remote did not send all necessary objects',
             /fatal: packed object [a-z0-9]+ \(stored in .*?\) is corrupt/,
-            /fatal: pack has \d+ unresolved deltas/,
+            /fatal: pack has \d+ unresolved delta/,
             'error: unable to read sha1 file of ',
             'fatal: did not receive expected object'
           ]

lib/git-fastclone/version.rb

@@ -2,5 +2,5 @@
 
 # Version string for git-fastclone
 module GitFastCloneVersion
-  VERSION = '1.2.5'.freeze
+  VERSION = '1.2.6'.freeze
 end

spec/git_fastclone_runner_spec.rb

@@ -333,6 +333,33 @@
       expect(yielded).to eq([test_url_valid])
     end
 
+    it 'should retry when one delta is missing' do
+      allow(subject).to receive(:update_reference_repo) {}
+      expect(subject).to receive(:reference_repo_dir)
+      expect(subject).to receive(:reference_repo_lock_file).and_return(lockfile)
+
+      responses = [
+        lambda { |_url|
+          raise Terrapin::ExitStatusError, <<-ERROR.gsub(/^ {12}/, '')
+            STDOUT:
+
+            STDERR:
+
+            error: Could not read f7fad86d06fee0678f9af7203b6031feabb40c3e
+            fatal: pack has 1 unresolved delta
+            fatal: index-pack failed
+          ERROR
+        },
+        ->(url) { url }
+      ]
+      subject.with_git_mirror(test_url_valid) do
+        yielded << responses.shift.call(test_url_valid)
+      end
+
+      expect(responses).to be_empty
+      expect(yielded).to eq([test_url_valid])
+    end
+
     it 'should retry when deltas are missing' do
       allow(subject).to receive(:update_reference_repo) {}
       expect(subject).to receive(:reference_repo_dir)