systemd-repart needs to find mkfs.ext4 for the test. This is located in the directory /usr/sbin on openSUSE Tumbleweed. But since the variable ALWAYS_SET_PATH in /etc/login.defs is set to yes, su re-initializes the $PATH variable and removes /usr/sbin. Hence, mkfs.ext4 is not found and the test fails. Using setpriv instead of su fixes this issue and is more appropriate to do the switch user task from root. [zjs: move setpriv to $BASICTOOLS and force-push to retrigger CI]
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