Improve libcdb fetch default behavior

pwnlib/commandline/libcdb.py

@@ -139,7 +139,7 @@
 fetch_parser = libc_commands.add_parser(
     'fetch',
     help = 'Fetch libc database',
-    description = 'Fetch libc database'
+    description = 'Fetch libc database. If no argument passed, it will init and upgrade libc-database repository',
 )
 
 fetch_parser.add_argument(
@@ -149,13 +149,6 @@
     help = 'Set libc-database path, If it is empty, the default path will be `context.local_libcdb` (%s)' % context.local_libcdb
 )
 
-fetch_parser.add_argument(
-    '-i', '--init',
-    action = 'store_true',
-    default = False,
-    help = 'Init libc-database'
-)
-
 fetch_parser.add_argument(
     '-u', '--update',
     metavar = 'update',
@@ -280,12 +273,18 @@ def main(args):
 
     elif args.libc_command == 'fetch':
 
-        if args.init:
-            subprocess.check_call(['git', 'clone', "https://github.com/niklasb/libc-database/", args.path])
-
-        elif args.update:
+        if args.update:
             subprocess.check_call(['./get'] + args.update, cwd=args.path)
 
+        else:
+            if not Path(args.path).exists() and yesno("Would you like to initialize the libc-database repository? "
+                                                      "If the path already exists, this prompt will not display, and automatically update repository."):
+                log.waitfor("init libc-database repository")
+                subprocess.check_call(['git', 'clone', 'https://github.com/niklasb/libc-database/', args.path])
+
+            log.waitfor("upgrade libc-database repository")
+            subprocess.check_call(['git', 'pull'], cwd=args.path)
+
 
 if __name__ == '__main__':
     pwnlib.commandline.common.main(__file__)