base-files: sysupgrade: avoid cat missing conffiles_static

If the user removes all /lib/apk/packages/*.conffiles* files to prevent
sysupgrade from preserving configuration, the glob no longer matches and
sysupgrade ends up calling cat on a non-existent path:

  cat: can't open '/lib/apk/packages/*.conffiles_static': No such file or directory

Fix this by using find cmd.

Signed-off-by: Nick Hainke <vincent@systemli.org>
Link: https://github.com/openwrt/openwrt/pull/22071
Signed-off-by: Robert Marko <robimarko@gmail.com>

diff --git a/package/base-files/files/sbin/sysupgrade b/package/base-files/files/sbin/sysupgrade
index 307ea6ac344dc27cf5ac01132888450e4fc6df43..88e154e39efa88a960f051de015f7c6ce3c9be62 100755 (executable)
--- a/package/base-files/files/sbin/sysupgrade
+++ b/package/base-files/files/sbin/sysupgrade
@@ -146,7 +146,7 @@ list_conffiles() {
                ' /usr/lib/opkg/status
        elif [ -d /lib/apk/packages ]; then
                conffiles=""
-               for file in /lib/apk/packages/*.conffiles_static; do
+               for file in $(find /lib/apk/packages -name "*.conffiles_static" -type f); do
                        conffiles="$(echo -e "$(cat $file)\n$conffiles")"
                done
                echo "$conffiles"