[yocto] add a user via recipe

[Matthias.Heise at atlas-elektronik.com]

Hi there,

I'm still trying to add a user via recipe. The method with

inherit extrausers
EXTRA_USER_PARAMS = "useradd -p '\$6\$53uYm/0Fnll\$Nc0RbHSvqRrd63Tw98TO3V1n25ORK9oR4QHqRIriXzLy0il/7.LIacX7mz7RJ1tdPIWiCJLNyQa7dKBNURqEg1' fstuser;"

Does not work (no errors just no user in image), as well as this :

ROOTFS_POSTPROCESS_COMMAND += "add_a_user;"

add_a_user(){
     useradd -p '\$6\$53uYm/0Fnll\$Nc0RbHSvqRrd63Tw98TO3V1n25ORK9oR4QHqRIriXzLy0il/7.LIacX7mz7RJ1tdPIWiCJLNyQa7dKBNURqEg1' fstuser;
}

Which results in an error during bitbake :
useradd: /etc/passwd.23966: Permission denied
useradd cannot lock /etc/passwd; try again later

any ideas to that ?
thanks,
regards
Mat
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