write script

script.rb

@@ -0,0 +1,31 @@
+
+CHARACTERS = ('0'..'9').to_a + ('a'..'f').to_a
+
+def random_hex_char
+  CHARACTERS.sample
+end
+
+def random_short_sha
+  Array.new(7) { random_hex_char }.join
+end
+
+if __FILE__ == $0
+  counter = 0
+  loop do
+    attempt = counter + 1
+    short_sha = random_short_sha
+    puts "attempt #{attempt}, short sha is #{short_sha}" if (counter % 1000).zero?
+
+    message = "attempt #{attempt}: #{short_sha}"
+    output = `git commit --allow-empty -m '#{message}'`.chomp
+
+    if output == "[main #{short_sha}] #{message}"
+      puts "success! the lucky short sha is #{short_sha}"
+      break
+    else
+      `git reset --hard HEAD~`
+    end
+
+    counter += 1
+  end
+end