source: freewrt/package/base-files/files/etc/functions.sh@ e86e2cb

load_modules() {
        sed 's/^[^#]/insmod &/' $* | ash 2>&- || :
}

user_exists() {
        grep -q "^$1:" $IPKG_INSTROOT/etc/passwd 2>&-
        return $?
}

group_exists() {
        grep -q "^$1:" $IPKG_INSTROOT/etc/group 2>&-
        return $?
}

service_exists() {
        grep -q "^$1[[:space:]]*$2" $IPKG_INSTROOT/etc/services 2>&-
        return $?
}

rcconf_exists() {
        grep -q "^#*$1=" $IPKG_INSTROOT/etc/rc.conf 2>&-
        return $?
}

add_user() {
        user_exists $1 || {
                echo "adding user $1 to /etc/passwd"
                echo "$1:x:$2:${3:-$2}:$1:${4:-/tmp}:${5:-/bin/false}" \
                    >>$IPKG_INSTROOT/etc/passwd
        }
}

add_group() {
        group_exists $1 || {
                echo "adding group $1 to /etc/group"
                echo "$1:x:$2:$3" >>$IPKG_INSTROOT/etc/group
        }
}

add_service() {
        service_exists $1 $2 || {
                echo "adding service $1 to /etc/services"
                printf '%s\t%s\n' "$1" "$2" >>$IPKG_INSTROOT/etc/services
        }
}

add_rcconf() {
        rcconf_exists $2 || {
                echo "adding service $1 to /etc/rc.conf"
                printf '%s\t\t# %s\n' "$2=$3" "$1" >>$IPKG_INSTROOT/etc/rc.conf
        }
}

get_next_uid() {
        uid=$(grep -v -e ^nobody: -e ^admin: $IPKG_INSTROOT/etc/passwd | \
            tail -n 1 | awk -F : '{ print $3 }')
        echo $((uid+1))
}

get_next_gid() {
        gid=$(grep -v -e ^nogroup: -e ^admin: $IPKG_INSTROOT/etc/group | \
            tail -n 1 | awk -F : '{ print $3 }')
        echo $((gid+1))
}