Jenkins 建構失敗每個奇怪的建構

所以我最近遇到了奇怪的問題，我的 jenkins 建構無緣無故地失敗了每個奇怪的建構。建構很簡單，它執行 ansible playbook，然後將程式碼部署到遠端機器，清除記憶體，執行維護等。

建構基本上執行這個：

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

然後，當內部版本號為奇數時，此步驟將失敗（以 force=yes 執行，因此本地修改應該沒問題）：

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   

追溯形成：

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

失敗的步驟：

- 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 }}

如果你在建構失敗後立即執行它，它會建構得很好。每次我從命令行執行它時它都會建構。

錯誤消息說：

UnboundLocalError：分配前引用的局部變數“remote_head”

我懷疑您遇到了一個錯誤，該錯誤已在 Ansible 2.2.1 中修復。請更新。

引用自：https://serverfault.com/questions/828423