Merge ~cjwatson/launchpad:fix-update-copyright into launchpad:master

[Colin Watson]

update-copyright: Fix handling of find-changed-files output

Since 2809101db8 ("Improve quoting in shell scripts"), `find-changed-files.sh` prints changed file names separated by newlines rather than spaces. That confuses `update-copyright`, which tries to split the output on spaces. We could revert that and pacify `shellcheck` in some other way, but newline-separation is really a bit more sensible for file names anyway, so let's just adapt `update-copyright` instead.

[Ioana Lasc (ilasc)]

review: Approve

diff --git a/utilities/update-copyright b/utilities/update-copyright
index 7af85ef..2910c7e 100755
--- a/utilities/update-copyright
+++ b/utilities/update-copyright
@@ -1,6 +1,6 @@
 #!/usr/bin/python3
 #
-# Copyright 2010-2020 Canonical Ltd.  This software is licensed under the
+# Copyright 2010-2022 Canonical Ltd.  This software is licensed under the
 # GNU Affero General Public License version 3 (see the file LICENSE).
 
 """Update the year in copyright notices.
@@ -80,7 +80,7 @@ def find_and_update():
     """Put it all together."""
     filenames = find_changed_files()
     if filenames != '':
-        update_files(filenames.split(' '))
+        update_files(filenames.splitlines())
 
 if __name__ == "__main__":
     if len(sys.argv) < 2: