The use of realpath(3) in
commit
58ed67992d0ec1fa505026105218fa449f7980b0
Author: Jani Nikula <jani@nikula.org>
Date: Sun Apr 7 20:15:03 2013 +0300
cli: config: do not overwrite symlinks when saving config file
broke config file save when the file does not exist, which results in
'notmuch setup' always failing to create a new config file.
Fix by checking ENOENT from realpath(3).