In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/lib/preinit/81_urandom_seed line 9:

    [ -O "$1" -a -G "$1" -a ! -x "$1" ] || { log_urandom_seed "Wrong owner / permissions for $1"; return; }

              ^-- SC2166 (warning): Prefer [ p ] && [ q ] as [ p -a q ] is not well defined.

                         ^-- SC2166 (warning): Prefer [ p ] && [ q ] as [ p -a q ] is not well defined.

In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/lib/preinit/81_urandom_seed line 21:

    [ "${SEED:0:1}" = "/" -a "$SEED" != "/etc/urandom.seed" ] && _do_urandom_seed "$SEED"

       ^---------^ SC3057 (warning): In POSIX sh, string indexing is undefined.

                          ^-- SC2166 (warning): Prefer [ p ] && [ q ] as [ p -a q ] is not well defined.

For more information:

  https://www.shellcheck.net/wiki/SC2166 -- Prefer [ p ] && [ q ] as [ p -a q...

  https://www.shellcheck.net/wiki/SC3057 -- In POSIX sh, string indexing is u...