• Will Thompson's avatar
    data: tell systemd to create state directory · 94a98153
    Will Thompson authored
    If the directory referred to by ReadWritePaths= does not exist, the
    service fails to start:
        systemd[1]: Starting Fingerprint Authentication Daemon...
        systemd[9736]: fprintd.service: Failed to set up mount namespacing: No such file or directory
        systemd[9736]: fprintd.service: Failed at step NAMESPACE spawning /usr/lib/fprintd/fprintd: No such file or directory
        systemd[1]: fprintd.service: Main process exited, code=exited, status=226/NAMESPACE
        systemd[1]: fprintd.service: Failed with result 'exit-code'.
        systemd[1]: Failed to start Fingerprint Authentication Daemon.
    This may happen when booting with an empty /var filesystem.
    For a system service, "StateDirectory=fprint" causes /var/lib/fprint and
    any parent directories to be created if missing (with mode 0755 by
    default, owned by the user and group of the service, which in this case
    is root).  In combination with ProtectSystem=strict, this state
    directory will be mounted read-write.  StateDirectory was introduced in
    systemd 235, so require at least this version.
    The /var/lib prefix is hardcoded in systemd. (Since systemd 240, the
    full path(s) to StateDirectory are provided as $STATE_DIRECTORY, but
    since it is always /var/lib, we continue to just hardcode that path.)
    On non-systemd systems, since fprintd runs as root with no confinement,
    it can create its state directory as needed (with g_mkdir_with_parents()
    in file_storage_print_data_save()).
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