Skip clone warming up when a file is missing (#67)

* Skip clone warming up when a file is missing

* Align spacing in help

Gemfile.lock

@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    git-fastclone (1.5.0)
+    git-fastclone (1.5.1)
       colorize
 
 GEM

lib/git-fastclone.rb

@@ -162,14 +162,15 @@ def parse_options
           options[:config] = config
         end
 
-        opts.on('--lock-timeout N', 'Timeout in seconds to acquire a lock on any reference repo.
-                Default is 0 which waits indefinitely.') do |timeout_secs|
+        opts.on('--lock-timeout N', 'Timeout in seconds to acquire a lock on any reference repo.',
+                'Default is 0 which waits indefinitely.') do |timeout_secs|
           self.flock_timeout_secs = timeout_secs.to_i
         end
 
-        opts.on('--pre-clone-hook command',
-                'An optional command that should be invoked before cloning mirror repo') do |command|
-          options[:pre_clone_hook] = command
+        opts.on('--pre-clone-hook script_file',
+                'An optional file that should be invoked before cloning mirror repo',
+                'No-op when a file is missing') do |script_file|
+          options[:pre_clone_hook] = script_file
         end
       end.parse!
     end
@@ -452,7 +453,13 @@ def usage
     private def trigger_pre_clone_hook_if_needed(url, mirror, attempt_number)
       return if Dir.exist?(mirror) || !options.include?(:pre_clone_hook)
 
-      popen2e_wrapper(options[:pre_clone_hook], url.to_s, mirror.to_s, attempt_number.to_s, quiet: !verbose)
+      hook_command = options[:pre_clone_hook]
+      unless File.exist?(File.expand_path(hook_command))
+        puts 'pre_clone_hook script is missing' if verbose
+        return
+      end
+
+      popen2e_wrapper(hook_command, url.to_s, mirror.to_s, attempt_number.to_s, quiet: !verbose)
     end
   end
 end

lib/git-fastclone/version.rb

@@ -2,5 +2,5 @@
 
 # Version string for git-fastclone
 module GitFastCloneVersion
-  VERSION = '1.5.0'
+  VERSION = '1.5.1'
 end

spec/git_fastclone_runner_spec.rb

@@ -146,11 +146,13 @@ def create_lockfile_double
       end
     end
 
-    context 'with pre-clone-hook errors' do
+    context 'with pre-clone-hook' do
       let(:pre_clone_hook) { '/some/command' }
       before(:each) do
         subject.options[:pre_clone_hook] = pre_clone_hook
         subject.reference_dir = placeholder_arg
+        allow(File).to receive(:exist?).and_call_original
+        allow(File).to receive(:exist?).with(pre_clone_hook).and_return(true)
         allow(subject).to receive(:with_git_mirror).and_call_original
         allow(subject).to receive(:with_reference_repo_lock) do |_url, &block|
           block.call
@@ -192,6 +194,22 @@ def create_lockfile_double
 
         subject.clone(placeholder_arg, nil, '.', 'config')
       end
+
+      context 'non-existing script' do
+        before(:each) do
+          allow(File).to receive(:exist?).with(pre_clone_hook).and_return(false)
+        end
+
+        it 'does not invoke hook command' do
+          allow(subject).to receive(:fail_on_error)
+          expect(subject).not_to receive(:popen2e_wrapper).with(
+            pre_clone_hook, 'PH', 'PH/PH', '0',
+            { quiet: true }
+          )
+
+          subject.clone(placeholder_arg, nil, '.', 'config')
+        end
+      end
     end
   end