Reimplement update_server_info to avoid error

eurostat_to_dbnomics.py

@@ -26,6 +26,7 @@
 
 import argparse
 from collections import deque, OrderedDict
+import glob
 import hashlib
 import io
 import itertools
@@ -42,7 +43,6 @@ from dulwich.objects import Blob, Tree, Commit
 from dulwich.pack import deltify_pack_objects, load_pack_index, OFS_DELTA, REF_DELTA, SHA1Writer, write_pack_index_v2, \
     write_pack_object, write_pack_header
 from dulwich.repo import Repo
-from dulwich.server import update_server_info
 from lxml import etree
 from slugify import slugify
 import ujson as json
@@ -400,7 +400,13 @@ def main():
             )
             log.info("Commit ID: %s", commit_id)
 
-            update_server_info(repo)
+            # Don't use dulwich.server.update_server_info because it triggers "Too many files open" error.
+            pack_dir_path = os.path.abspath(os.path.join(args.target_dir, "objects", "pack"))
+            packs_file_path = os.path.join(args.target_dir, "objects", "info", "packs")
+            with open(packs_file_path, "w") as packs_file:
+                for pack_file_path in glob.iglob(os.path.join(pack_dir_path, "*.pack")):
+                    pack_file_name = os.path.basename(pack_file_path)
+                    packs_file.write("P {}\n".format(pack_file_name))
 
     return 0