为什么当用户名设置为其他值时,服务以根用户身份运行

conf 文件在/etc/init中/

description "AAE client app"

start on runlevel [2345]
stop on runlevel [!2345]

respawn

env PATH=/home/ec2-user/aae_client/env/bin
env PROGRAM_NAME="aae"
env USERNAME="ec2-user"

# Main script to be run
script
    echo "[`date -u +%Y-%m-%dT%T.%3NZ`] (sys) Ready to run..." >> /var/log/$PROGRAM_NAME.sys.log

    export HOME="/home/ec2-user"
    echo $$ > /var/run/$PROGRAM_NAME.pid

    cd /home/ec2-user/aae_client
    exec python -m app.run >> /var/log/$PROGRAM_NAME.sys.log 2>&1
end script

我已经设置了 USERNAME ec2-user . 但是当我运行服务时,它显示它是由 root PATH 设置正确。为什么在指定用户名时仍以根用户身份运行?