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New version of systemd implements a new feature of updating /etc or /var when needed at boot. For details, please see link below. Opointer.de/blog/projects/stateless.html For now, at boot time, the systemd-sysusers.service would update user database files (/etc/passwd, /etc/group, etc.) according to the configuration files under /usr/lib/sysusers.d. This step is necessary for other systemd services to work correctly. Examples of such services are systemd-resolved and systemd-tmpfiles-setup. The problem is that on a read-only file system, that is, if /etc is read-only, the user database files could not be updated, causing failures of services. This patch fixes this problem by adding users/groups at rootfs time. (From OE-Core rev: 2501c2f03f24fbbefd9999dd444318704d8aa8c2) Signed-off-by: Chen Qi <Qi.Chen@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>