Ansible: cron module crashing when crontab doesn't exist

Created on 14 Dec 2016  ·  1Comment  ·  Source: ansible/ansible
ISSUE TYPE

  • Bug Report
COMPONENT NAME


cron

ANSIBLE VERSION
ansible 2.2.0.0
  config file = /etc/ansible/ansible.cfg
  configured module search path = Default w/o overrides
CONFIGURATION


set forks to 50
set remote_user to root

OS / ENVIRONMENT


Running from Arch
Managing Debian and Arch

SUMMARY


When trying to add an variable to crontab, the cron module crashes when the crontab for the user doesn't exist

STEPS TO REPRODUCE


How I found it:

 - name: add mailto in crontab
   cron:
       env: true
       name: MAILTO
       value: [email protected]

Also reproducable with: ansible server -m cron

EXPECTED RESULTS


Crontab is created and the variable is set

ACTUAL RESULTS

Using /etc/ansible/ansible.cfg as config file
Loading callback plugin default of type stdout, v2.0 from /usr/lib/python2.7/site-packages/ansible/plugins/callback/__init__.pyc
 _________________________ 
< PLAYBOOK: cron_test.yml >
 ------------------------- 
        \   ^__^
         \  (oo)\_______
            (__)\       )\/\
                ||----w |
                ||     ||

1 plays in cron_test.yml
 ________________ 
< PLAY [servers] >
 ---------------- 
        \   ^__^
         \  (oo)\_______
            (__)\       )\/\
                ||----w |
                ||     ||

 ______________ 
< TASK [setup] >
 -------------- 
        \   ^__^
         \  (oo)\_______
            (__)\       )\/\
                ||----w |
                ||     ||

Using module file /usr/lib/python2.7/site-packages/ansible/modules/core/system/setup.py
<server.example.com> ESTABLISH SSH CONNECTION FOR USER: root
<server.example.com> SSH: EXEC ssh -vvv -C -o ControlMaster=auto -o ControlPersist=60s -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o User=root -o ConnectTimeout=10 -o ControlPath=/home/yannik/.ansible/cp/ansible-ssh-%h-%p-%r server.example.com '/bin/sh -c '"'"'( umask 77 && mkdir -p "` echo $HOME/.ansible/tmp/ansible-tmp-1481749084.03-261788129351509 `" && echo ansible-tmp-1481749084.03-261788129351509="` echo $HOME/.ansible/tmp/ansible-tmp-1481749084.03-261788129351509 `" ) && sleep 0'"'"''
<server.example.com> PUT /tmp/tmpkmhzmG TO /root/.ansible/tmp/ansible-tmp-1481749084.03-261788129351509/setup.py
<server.example.com> SSH: EXEC sftp -b - -vvv -C -o ControlMaster=auto -o ControlPersist=60s -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o User=root -o ConnectTimeout=10 -o ControlPath=/home/yannik/.ansible/cp/ansible-ssh-%h-%p-%r '[server.example.com]'
<server.example.com> ESTABLISH SSH CONNECTION FOR USER: root
<server.example.com> SSH: EXEC ssh -vvv -C -o ControlMaster=auto -o ControlPersist=60s -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o User=root -o ConnectTimeout=10 -o ControlPath=/home/yannik/.ansible/cp/ansible-ssh-%h-%p-%r server.example.com '/bin/sh -c '"'"'chmod u+x /root/.ansible/tmp/ansible-tmp-1481749084.03-261788129351509/ /root/.ansible/tmp/ansible-tmp-1481749084.03-261788129351509/setup.py && sleep 0'"'"''
<server.example.com> ESTABLISH SSH CONNECTION FOR USER: root
<server.example.com> SSH: EXEC ssh -vvv -C -o ControlMaster=auto -o ControlPersist=60s -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o User=root -o ConnectTimeout=10 -o ControlPath=/home/yannik/.ansible/cp/ansible-ssh-%h-%p-%r -tt server.example.com '/bin/sh -c '"'"'/usr/bin/python2 /root/.ansible/tmp/ansible-tmp-1481749084.03-261788129351509/setup.py; rm -rf "/root/.ansible/tmp/ansible-tmp-1481749084.03-261788129351509/" > /dev/null 2>&1 && sleep 0'"'"''
ok: [server.example.com]
 ______________________________ 
< TASK [add mailto in crontab] >
 ------------------------------ 
        \   ^__^
         \  (oo)\_______
            (__)\       )\/\
                ||----w |
                ||     ||

task path: /home/yannik/ansible/cron_test.yml:8
Using module file /usr/lib/python2.7/site-packages/ansible/modules/core/system/cron.py
<server.example.com> ESTABLISH SSH CONNECTION FOR USER: root
<server.example.com> SSH: EXEC ssh -vvv -C -o ControlMaster=auto -o ControlPersist=60s -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o User=root -o ConnectTimeout=10 -o ControlPath=/home/yannik/.ansible/cp/ansible-ssh-%h-%p-%r server.example.com '/bin/sh -c '"'"'( umask 77 && mkdir -p "` echo $HOME/.ansible/tmp/ansible-tmp-1481749089.57-122565518806595 `" && echo ansible-tmp-1481749089.57-122565518806595="` echo $HOME/.ansible/tmp/ansible-tmp-1481749089.57-122565518806595 `" ) && sleep 0'"'"''
<server.example.com> PUT /tmp/tmpo5QPIc TO /root/.ansible/tmp/ansible-tmp-1481749089.57-122565518806595/cron.py
<server.example.com> SSH: EXEC sftp -b - -vvv -C -o ControlMaster=auto -o ControlPersist=60s -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o User=root -o ConnectTimeout=10 -o ControlPath=/home/yannik/.ansible/cp/ansible-ssh-%h-%p-%r '[server.example.com]'
<server.example.com> ESTABLISH SSH CONNECTION FOR USER: root
<server.example.com> SSH: EXEC ssh -vvv -C -o ControlMaster=auto -o ControlPersist=60s -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o User=root -o ConnectTimeout=10 -o ControlPath=/home/yannik/.ansible/cp/ansible-ssh-%h-%p-%r server.example.com '/bin/sh -c '"'"'chmod u+x /root/.ansible/tmp/ansible-tmp-1481749089.57-122565518806595/ /root/.ansible/tmp/ansible-tmp-1481749089.57-122565518806595/cron.py && sleep 0'"'"''
<server.example.com> ESTABLISH SSH CONNECTION FOR USER: root
<server.example.com> SSH: EXEC ssh -vvv -C -o ControlMaster=auto -o ControlPersist=60s -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o User=root -o ConnectTimeout=10 -o ControlPath=/home/yannik/.ansible/cp/ansible-ssh-%h-%p-%r -tt server.example.com '/bin/sh -c '"'"'/usr/bin/python2 /root/.ansible/tmp/ansible-tmp-1481749089.57-122565518806595/cron.py; rm -rf "/root/.ansible/tmp/ansible-tmp-1481749089.57-122565518806595/" > /dev/null 2>&1 && sleep 0'"'"''
fatal: [server.example.com]: FAILED! => {
    "changed": false, 
    "failed": true, 
    "invocation": {
        "module_name": "cron"
    }, 
    "module_stderr": "OpenSSH_7.3p1, OpenSSL 1.0.2j  26 Sep 2016\r\ndebug1: Reading configuration data /home/yannik/.ssh/config\r\ndebug1: /home/yannik/.ssh/config line 12: Applying options for server.example.com\r\ndebug3: kex names ok: [diffie-hellman-group1-sha1]\r\ndebug1: Reading configuration data /etc/ssh/ssh_config\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 = 4951\r\ndebug3: mux_client_request_session: session request sent\r\ndebug1: mux_client_request_session: master session id: 2\r\ndebug3: mux_client_read_packet: read header failed: Broken pipe\r\ndebug2: Received exit status from master 0\r\nShared connection to server.example.com closed.\r\n", 
    "module_stdout": "Traceback (most recent call last):\r\n  File \"/tmp/ansible_osseXT/ansible_module_cron.py\", line 703, in <module>\r\n    main()\r\n  File \"/tmp/ansible_osseXT/ansible_module_cron.py\", line 578, in main\r\n    crontab = CronTab(module, user, cron_file)\r\n  File \"/tmp/ansible_osseXT/ansible_module_cron.py\", line 236, in __init__\r\n    self.read()\r\n  File \"/tmp/ansible_osseXT/ansible_module_cron.py\", line 257, in read\r\n    raise CronTabError(\"Unable to read crontab\")\r\n__main__.CronTabError: Unable to read crontab\r\n", 
    "msg": "MODULE FAILURE"
}
 ____________ 
< PLAY RECAP >
 ------------ 
        \   ^__^
         \  (oo)\_______
            (__)\       )\/\
                ||----w |
                ||     ||

server.example.com : ok=1    changed=0    unreachable=0    failed=1
picture adnidor

Most helpful comment

OK, I just discovered that on the systems where this happens, cron is not installed.

picture adnidor on 14 Dec 2016
👍4

>All comments

OK, I just discovered that on the systems where this happens, cron is not installed.

adnidor picture adnidor on 14 Dec 2016
👍4
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