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Jenkins 构建每次都失败

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Jenkins 构建每次都失败

所以我最近遇到了一个奇怪的问题，我的 jenkins 构建每次构建都会无缘无故地失败。构建很简单，它运行 ansible playbook，它会依次将代码部署到远程机器、清除缓存、运行维护等。

每次构建都会失败

构建基本上运行这个：

ansible-playbook -i ansible/hosts ansible/backend.yml

然后，当构建号为奇数时，此步骤将失败（以 force=yes 运行，因此本地修改应该没有问题）：

TASK [backend : Clone backend repo] ********************************************
task path: /opt/provision/ansible/roles/backend/tasks/main.yml:5
Using module file /usr/lib/python2.6/site-packages/ansible/modules/core/source_control/git.py
<server_ip_address> ESTABLISH SSH CONNECTION FOR USER: username
<server_ip_address> SSH: EXEC ssh -vvv -C -o ControlMaster=auto -o ControlPersist=60s -o 'IdentityFile="/var/lib/jenkins/.ssh/jenkins"' -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o User=username -o ConnectTimeout=10 -o ConnectionAttempts=20 -o ControlPath=/var/lib/jenkins/.ansible/cp/ansible-ssh-%h-%p-%r server_ip_address '/bin/sh -c '"'"'( umask 77 && mkdir -p "` echo $HOME/.ansible/tmp/ansible-tmp-1485853855.83-181127458563499 `" && echo ansible-tmp-1485853855.83-181127458563499="` echo $HOME/.ansible/tmp/ansible-tmp-1485853855.83-181127458563499 `" ) && sleep 0'"'"''
<server_ip_address> PUT /tmp/tmpdgsmCK TO /home/username/.ansible/tmp/ansible-tmp-1485853855.83-181127458563499/git.py
<server_ip_address> SSH: EXEC sftp -b - -vvv -C -o ControlMaster=auto -o ControlPersist=60s -o 'IdentityFile="/var/lib/jenkins/.ssh/jenkins"' -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o User=username -o ConnectTimeout=10 -o ConnectionAttempts=20 -o ControlPath=/var/lib/jenkins/.ansible/cp/ansible-ssh-%h-%p-%r '[server_ip_address]'
<server_ip_address> ESTABLISH SSH CONNECTION FOR USER: username
<server_ip_address> SSH: EXEC ssh -vvv -C -o ControlMaster=auto -o ControlPersist=60s -o 'IdentityFile="/var/lib/jenkins/.ssh/jenkins"' -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o User=username -o ConnectTimeout=10 -o ConnectionAttempts=20 -o ControlPath=/var/lib/jenkins/.ansible/cp/ansible-ssh-%h-%p-%r server_ip_address '/bin/sh -c '"'"'chmod u+x /home/username/.ansible/tmp/ansible-tmp-1485853855.83-181127458563499/ /home/username/.ansible/tmp/ansible-tmp-1485853855.83-181127458563499/git.py && sleep 0'"'"''
<server_ip_address> ESTABLISH SSH CONNECTION FOR USER: username
<server_ip_address> SSH: EXEC ssh -vvv -C -o ControlMaster=auto -o ControlPersist=60s -o 'IdentityFile="/var/lib/jenkins/.ssh/jenkins"' -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o User=username -o ConnectTimeout=10 -o ConnectionAttempts=20 -o ControlPath=/var/lib/jenkins/.ansible/cp/ansible-ssh-%h-%p-%r -tt server_ip_address '/bin/sh -c '"'"'/usr/bin/python /home/username/.ansible/tmp/ansible-tmp-1485853855.83-181127458563499/git.py; rm -rf "/home/username/.ansible/tmp/ansible-tmp-1485853855.83-181127458563499/" > /dev/null 2>&1 && sleep 0'"'"''
fatal: [backend]: FAILED! => {
    "changed": false, 
    "failed": true, 
    "invocation": {
        "module_name": "git"
    }, 
    "module_stderr": "OpenSSH_6.6.1, OpenSSL 1.0.1k-fips 8 Jan 2015\r\ndebug1: Reading configuration data /etc/ssh/ssh_config\r\ndebug1: /etc/ssh/ssh_config line 56: Applying options for *\r\ndebug1: auto-mux: Trying existing master\r\ndebug2: fd 3 setting O_NONBLOCK\r\ndebug2: mux_client_hello_exchange: master version 4\r\ndebug3: mux_client_forwards: request forwardings: 0 local, 0 remote\r\ndebug3: mux_client_request_session: entering\r\ndebug3: mux_client_request_alive: entering\r\ndebug3: mux_client_request_alive: done pid = 23456\r\ndebug3: mux_client_request_session: session request sent\r\ndebug1: mux_client_request_session: master session id: 4\r\ndebug3: mux_client_read_packet: read header failed: Broken pipe\r\ndebug2: Received exit status from master 0\r\nShared connection to server_ip_address closed.\r\n", 
    "module_stdout": "Traceback (most recent call last):\r\n  File \"/tmp/ansible_lVW4UB/ansible_module_git.py\", line 1040, in <module>\r\n    main()\r\n  File \"/tmp/ansible_lVW4UB/ansible_module_git.py\", line 994, in main\r\n    result.update(changed=True, after=remote_head, msg='Local modifications exist')\r\nUnboundLocalError: local variable 'remote_head' referenced before assignment\r\n", 
    "msg": "MODULE FAILURE"
}
    to retry, use: --limit @/opt/provision/ansible/backend.retry

PLAY RECAP *********************************************************************
backend                       : ok=2    changed=1    unreachable=0    failed=1

回溯格式：

Traceback (most recent call last):
  File \"/tmp/ansible_lVW4UB/ansible_module_git.py\", line 1040, in <module>
    main()
  File \"/tmp/ansible_lVW4UB/ansible_module_git.py\", line 994, in main
    result.update(changed=True, after=remote_head, msg='Local modifications exist')
UnboundLocalError: local variable 'remote_head' referenced before assignment

失败的步骤：

- name: Clone backend 
  git: >
   repo="{{ backend_repo }}"
   dest="{{ backend_path }}"
   accept_hostkey=yes
   key_file="{{ backend_key }}"
   clone=yes
   force=yes
   update=yes
   version={{ backend_branch }}

如果在失败后立即运行构建，它会顺利构建。而且每次我从命令行运行它时它都会构建。

答案1

错误信息显示：

UnboundLocalError：局部变量“remote_head”在赋值之前被引用

我怀疑你遇到了一个错误，固定的在 Ansible 2.2.1 中。请更新。

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