Remove linux packages older than 120 days

For testing purposes this does not remove but instead reports
on what files would be removed and the age of the file.

Fixes https://github.com/brave/devops/issues/739

script/sign_upload_linux_pkgs.py

@@ -10,8 +10,10 @@ import logging
 import os
 import re
 import requests
+import shutil
 import subprocess
 import sys
+import time
 
 from argparse import RawTextHelpFormatter
 from lib.config import get_raw_version
@@ -108,6 +110,15 @@ def main():
             'Error: could not change directory to {}: {}'.format(repo_dir, ose))
         exit(message)
 
+    # remove files older than 120 days from dist_dir
+    delete_age = 120 * 86400
+
+    logging.info("Performing removal of files older than 120 days in directory: {}".format(dist_dir))
+
+    # act=False is used for testing, instead of actually removing the files
+    # we just report what files would be removed
+    remove_files_older_x_days(dist_dir, delete_age, act=False)
+
     # Now upload to aptly and rpm repos
 
     for item in ['upload_to_aptly', 'upload_to_rpm_repo']:
@@ -145,6 +156,38 @@ def main():
         exit(message)
 
 
+def remove_files_older_x_days(dir, age, act=False):
+    items = get_files_older_x_days(dir, age)
+    for i in items:
+        logging.debug("Removing file: {}".format(i))
+        if os.path.isfile(os.path.join(dir, i)):
+            if act:
+                logging.debug("Removing file: {}; "
+                              " mtime: {}".format(i,
+                                                  datetime.datetime.fromtimestamp(os.path.getmtime(
+                                                                                            os.path.join(dir, i)))))
+                try:
+                    os.remove(os.path.join(dir, i))
+                except Error as e:
+                    logging.error("Cannot remove file: {}; Error: {}".format(os.path.join(dir, i), e))
+            else:
+                logging.debug("Would remove file(act=False): {}; "
+                              " mtime: {}".format(i,
+                                                  datetime.datetime.fromtimestamp(os.path.getmtime(
+                                                                                            os.path.join(dir, i)))))
+
+
+def get_files_older_x_days(dir, age):
+    items = []
+    now = time.time()
+    for f in os.listdir(dir):
+        path = os.path.join(dir, f)
+        if os.path.isfile(path):
+            if os.stat(path).st_mtime < now - age:
+                items.append(f)
+    return items
+
+
 def download_linux_pkgs_from_github(args, logging):
 
     file_list = []