[openwrt/openwrt] base-files: coreutil-sha256sum breaks status code

[LEDE Commits]

hauke pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/fed9bfbfeb84a15c198138a2015d001f82e480d4

commit fed9bfbfeb84a15c198138a2015d001f82e480d4
Author: Huangbin Zhan <zhanhb88 at gmail.com>
AuthorDate: Thu Jun 4 21:49:54 2020 +0800

    base-files: coreutil-sha256sum breaks status code
    
    With package "coreutil-sha256sum" installed "sysupgrade" fails to perform 'sha256sum -s' and instead returns 'invalid option -- 's''.
    This is caused due to:
            different syntax for a sha256sum status check ('sha256sum --status' with "coreutil-sha256sum")
            '/usr/bin/sha256sum' being symlinked to '/usr/bin/gnu-sha256sum' (after installation of "coreutil-sha256sum")
    "coreutil-sha256sum" package from the packages feed replaces the Busybox sha256sum
    This patch restores for 'sysupgrade' the busybox call to its sha256sum applet.
    
    Signed-off-by: Huangbin Zhan <zhanhb88 at gmail.com>
---
 package/base-files/files/sbin/sysupgrade | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/package/base-files/files/sbin/sysupgrade b/package/base-files/files/sbin/sysupgrade
index abd34bdcfb..ca2eb298dc 100755
--- a/package/base-files/files/sbin/sysupgrade
+++ b/package/base-files/files/sbin/sysupgrade
@@ -127,7 +127,7 @@ list_changed_conffiles() {
 	list_conffiles | while read file csum; do
 		[ -r "$file" ] || continue
 
-		echo "${csum}  ${file}" | sha256sum -sc - || echo "$file"
+		echo "${csum}  ${file}" | busybox sha256sum -sc - || echo "$file"
 	done
 }