I'm using ansible 1.4.3 to install and update some RPM packages and I
recently hit this bug. I'm using a pre_task on my playbook to check if
there are any updates available for a specific package, like this:
- name: check if there are updates available
shell: yum list updates | grep "my-package" -c
register: num_updates
ignore_errors: true
- debug: var=num_updates
The -c parameter on grep returns the number of lines in which "my-package"
appears. If the number of lines is 0, then there are no updates available
and I can skip a few steps down the road. The thing is the task fails with
this output:
failed: [IP] => {"changed": true, "cmd": "yum list updates | grep
\"my-package\" -c ", "delta": "0:00:20.941810", "end": "2014-01-30
09:50:59.964388", "rc": 1, "start": "2014-01-30 09:50:39.022578"}
stdout: 0
ok: [IP] => {
"num_updates": {
"changed": true,
"cmd": "yum list updates | grep \"my-package\" -c ",
"delta": "0:00:20.941810",
"end": "2014-01-30 09:50:59.964388",
"invocation": {
"module_args": "yum list updates | grep \"my-package\" -c",
"module_name": "shell"
},
"rc": 1,
"start": "2014-01-30 09:50:39.022578",
"stderr": "",
"stdout": "0",
"stdout_lines": [
"0"
]
}
}
unless I add something like '*| sed "s/^0$/'0'/g"*' to the shell command,
so that stdout turns into a string if the result is 0 and the output
changes to:
changed: [IP] => {"changed": true, "cmd": "yum list updates | grep
\"my-package\" -c | sed \"s/^0$/'0'/g\" ", "delta": "0:00:05.715204",
"end": "2014-01-30 10:00:31.365116", "rc": 0, "start": "2014-01-30
10:00:25.649912", "stderr": "", "stdout": "'0'"}
ok: [IP] => {
"num_updates": {
"changed": true,
"cmd": "yum list updates | grep \"my-package\" -c | sed
\"s/^0$/'0'/g\" ",
"delta": "0:00:05.715204",
"end": "2014-01-30 10:00:31.365116",
"invocation": {
"module_args": "yum list updates | grep \"my-package\" -c | sed
\"s/^0$/'0'/g\"",
"module_name": "shell"
},
"rc": 0,
"start": "2014-01-30 10:00:25.649912",
"stderr": "",
"stdout": "'0'",
"stdout_lines": [
"'0'"
]
}
}
Should I be doing something different?
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