Jenkins里调用ansible相关的shell命令报错

#!/bin/sh

set +x
source /home/deploy/.py3-a2.7-env/bin/activate
source /home/deploy/.py3-a2.7-env/ansible/hacking/env-setup -q

cd /home/deploy
ansible --version
ansible-playbook --version

ansible -i testservers testserver -m command -a "ip addr"
set -x

报错如下：
Started by user admin
Building in workspace /var/lib/jenkins/workspace/ansible-freestyle-job
[ansible-freestyle-job] $ /bin/sh /tmp/jenkins2658862072174212825.sh
/tmp/jenkins2658862072174212825.sh: line 4: /home/deploy/.py3-a2.7-env/bin/activate: Permission denied
Build step ‘Execute shell’ marked build as failure
Finished: FAILURE

请问用jenkins build默认是在用哪个用户执行shell？我已经chmod 777了为什么还会有permission的错误？