Use updated lxc-download script from upstream

jlmkr.py

@@ -113,7 +113,7 @@ JAILS_DIR_PATH = "jails"
 JAIL_CONFIG_NAME = "config"
 JAIL_ROOTFS_NAME = "rootfs"
 DOWNLOAD_SCRIPT_DIGEST = (
-    "6cca2eda73c7358c232fecb4e750b3bf0afa9636efb5de6a9517b7df78be12a4"
+    "d11fc7e5950d0e01bbca89ad8f663a698880ef7f4b0473453ba46a693cec4d12"
 )
 SCRIPT_PATH = os.path.realpath(__file__)
 SCRIPT_NAME = os.path.basename(SCRIPT_PATH)
@@ -787,6 +787,22 @@ def validate_sha256(file_path, digest):
         return False
 
 
+def remove_lines_after_line_number(file_path, line_number):
+    with open(file_path, "r+") as file:
+        current_line_number = 1
+
+        # Read the last line to keep
+        while current_line_number <= line_number:
+            file.readline()
+            current_line_number += 1
+
+        # Seek to the last line to keep
+        # https://stackoverflow.com/a/78176770
+        file.seek(file.tell())
+        # Remove everything after line_number
+        file.truncate()
+
+
 def run_lxc_download_script(
     jail_name=None, jail_path=None, jail_rootfs_path=None, distro=None, release=None
 ):
@@ -810,9 +826,13 @@ def run_lxc_download_script(
     # Fetch the lxc download script if not present locally (or hash doesn't match)
     if not validate_sha256(lxc_download_script, DOWNLOAD_SCRIPT_DIGEST):
         urllib.request.urlretrieve(
-            "https://raw.githubusercontent.com/Jip-Hop/lxc/58520263041b6864cadad96278848f9b8ce78ee9/templates/lxc-download.in",
+            "https://raw.githubusercontent.com/Jip-Hop/lxc/97f93be72ebf380f3966259410b70b1c966b0ff0/templates/lxc-download.in",
             lxc_download_script,
         )
+
+        # Throw away the last part of the download script, jailmaker doesn't need it
+        remove_lines_after_line_number(lxc_download_script, 404)
+
         if not validate_sha256(lxc_download_script, DOWNLOAD_SCRIPT_DIGEST):
             eprint("Abort! Downloaded script has unexpected contents.")
             return 1