fix: enforce timeout

Author: 3v0k4

lib/knapsack_pro/repository_adapters/git_adapter.rb

@@ -48,10 +48,34 @@ def git_commit_authors
       end
 
       def git_unshallow
-        command = 'git fetch --shallow-since "one month ago" --quiet 2>/dev/null'
-        Timeout.timeout(5) { `#{command}` }
-      rescue Timeout::Error
-        KnapsackPro.logger.debug("Skip the `#{command}` command because it took too long.")
+        args = ['git', 'fetch', '--quiet', '--shallow-since', 'one month ago']
+
+        begin
+          pid = Process.spawn(*args, err: File::NULL, pgroup: true)
+        rescue StandardError => e
+          KnapsackPro.logger.debug("Failed to unshallow (#{args.join(' ')}): #{e.message}")
+          return
+        end
+
+        begin
+          Timeout.timeout(5) { safe_waitpid(pid) }
+        rescue Timeout::Error
+          safe_kill(-pid)
+          safe_waitpid(pid)
+          KnapsackPro.logger.debug("Failed to unshallow (#{args.join(' ')}) in 5 seconds")
+        end
+      end
+
+      def safe_waitpid(pid)
+        Process.waitpid(pid)
+      rescue Errno::ECHILD
+        nil
+      end
+
+      def safe_kill(pid)
+        Process.kill('KILL', pid)
+      rescue Errno::ESRCH
+        nil
       end
 
       def git_build_author