CODEWITHSUNDEEP
ansible
GP92
GP92

Reputation: 435

Ansible script module adds leading newline character in stdout, probably when sudo is used. Why?

My script is as follows:

#!/bin/bash
if lscpu | grep 'CPU max MHz' >/dev/null 2>&1; then
        cpu_speed=$(lscpu | grep 'CPU max MHz' | cut -d':' -f2 | awk '{print $1}')
else
        cpu_speed=$(lscpu | grep 'CPU MHz' | cut -d':' -f2 | awk '{print $1}')
fi
echo -ne "${cpu_speed}"

It adds newline in the output as follows:

"stdout": "\r\n4000.0000",

Even if my script file is empty, it still adds newline in stdout as follows:

"stdout": "\r\n"

My module is as follows:

- name: Get Processor Speed
  script: files/get_cpu_speed.sh
  register: cpu_speed_output
  become: yes

So, as you can see it does sudo.

I was trying to find any references online if leading newline is common with ansible script command, but there is none.

So, what could be causing the leading line in my case?

Debug output is as follows:

ssh -C -o ControlMaster=auto -o ControlPersist=60s -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o User=testuser -o ConnectTimeout=10 -o ControlPath=/root/.ansible/cp/c4ee167dc2 -tt myserver1 '/bin/sh -c '"'"'sudo -H -S  -p "[sudo via ansible, key=epollvusfsfrfsfsfsfmrxdcida] password: " -u root /bin/sh -c '"'"'"'"'"'"'"'"'echo BECOME-SUCCESS-epollvusfsfrfsfsfsfmrxdcida;  /home/testuser/.ansible/tmp/ansible-tmp-1557164925.73-152013190475693/get_cpu_speed.sh'"'"'"'"'"'"'"'"' && sleep 0'"'"''

Upvotes: 1

Views: 453

Answers (1)

larsks
larsks

Reputation: 311605

I am unable to reproduce that behavior. If I run your code exactly as presented, I don't see any leading newline. In any case, there is an easy workaround available. Instead of referring to:

cpu_speed_output.stdout

You can refer to:

cpu_speed_output.stdout.strip()

The strip() method will strip any leading or trailing whitespace.

Upvotes: 2

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