Yocto Project Reference Manual - extrausers.bbclass

extrausers.bbclass這個class允許我們在image中加入新的userand group，透過EXTRA_USERS_PARAMS 來設定，如:
新增兩個user，"tester-jim"與"tester-sue" ，其密碼都是tester01

     inherit extrausers
     EXTRA_USERS_PARAMS = "\
         useradd -P tester01 tester-jim; \
         useradd -P tester01 tester-sue; \
         "

也可以用於變更(設定)密碼

     inherit extrausers
     EXTRA_USERS_PARAMS = "\
         usermod -P 1876*18 root; \
         "

更複雜的例子如下

     inherit extrausers
     EXTRA_USERS_PARAMS = "\
         useradd -p '' tester; \
         groupadd developers; \
         userdel nobody; \
         groupdel -g video; \
         groupmod -g 1020 developers; \
         usermod -s /bin/sh tester; \
         "

參考資料:
• https://www.yoctoproject.org/docs/1.8/ref-manual/ref-manual.html#ref-classes-extrausers, extrausers.bbclass