[PATCH 1/4] [gdb] Handle empty list in update_files in copyright.py

[Tom de Vries <tdevries@suse.de>]

Function update_files in copyright.py can be called with an update_list
such that len(list(update_list)) == 0.  If so, the function hangs.

Fix this by:
- converting iterable update_list to a list, and
- bailing out if len == 0.
---
 gdb/copyright.py | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/gdb/copyright.py b/gdb/copyright.py
index 94a1dfc91de..cf838453c45 100755
--- a/gdb/copyright.py
+++ b/gdb/copyright.py
@@ -87,6 +87,13 @@ def update_files(update_list: Iterable[str]):
 
     We use gnulib's update-copyright script for that.
     """
+
+    update_list = list(update_list)
+    if not update_list:
+        # When running gnulib/import/extra/update-copyright with no arguments,
+        # it reads from stdin, causing a hang.
+        return
+
     # We want to use year intervals in the copyright notices, and
     # all years should be collapsed to one single year interval,
     # even if there are "holes" in the list of years found in the
-- 
2.51.0