Unable to execute shell script

[Yogita Patil]

Hi All,

I am simply unable to execute a shell script on the remote host - this is my code (all other tasks run correctly except the execute task)

- name: Power consumption test
  hosts: all
  tasks:

     - name: Transfer the script
       ansible.builtin.copy:
         src: power_consumption.sh
         dest: /usr/src/power_consumption.sh
         mode: '0777'

     - name: Execute the script
#       command: ./usr/src/power_consumption.sh
       command: "{{ item }}"
       args:
         chdir: "/usr/src/"
       with_items:
        - "./power_consumption.sh"
       ignore_errors: true

     - name: Remove shell script from remote server
       file:
         path: /usr/src/power_consumption.sh
         state: absent

     - name: Copy shell script output from remote server
       fetch:
         src: /usr/src/{{ ansible_fqdn }}.txt
         dest: /usr/src
         mode: '0777'
         with_fileglob:
          _ "*.txt"

I have also tried with the shell: , script: sh ways of executing the script and none of them work, can someone tell me what I am doing wrong? TIA.

[Dick Visser]

Without any real data it's impossible to tell. 

Can you at a minimum post the error message?

Sent from Gmail Mobile

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[alex...@gmail.com]

Create a var for script i.e.: script_path="/some/path/script" and use that instead of hard coding path

[Yogita Patil]

Thanks for the responses guys, but these are the errors I see -

The full traceback is:
  File "/tmp/ansible_ansible.legacy.command_payload_uk3ys11b/ansible_ansible.legacy.command_payload.zip/ansible/module_utils/basic.py", line 2050, in run_command
    cmd = subprocess.Popen(args, **kwargs)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/subprocess.py", line 1024, in __init__
    self._execute_child(args, executable, preexec_fn, close_fds,
  File "/usr/lib/python3.11/subprocess.py", line 1901, in _execute_child
    raise child_exception_type(errno_num, err_msg, err_filename)
failed: [100.91.187.42] (item=./power_consumption.sh) => {
    "ansible_loop_var": "item",
    "changed": false,
    "cmd": "./power_consumption.sh",
    "invocation": {
        "module_args": {
            "_raw_params": "./power_consumption.sh",
            "_uses_shell": false,
            "argv": null,
            "chdir": "/usr/src/",
            "creates": null,
            "executable": null,
            "removes": null,
            "stdin": null,
            "stdin_add_newline": true,
            "strip_empty_ends": true
        }
    },
    "item": "./power_consumption.sh",
    "msg": "[Errno 8] Exec format error: b'./power_consumption.sh'",
    "rc": 8,
    "stderr": "",
    "stderr_lines": [],
    "stdout": "",
    "stdout_lines": []
}

I also create a simple foo.sh and tried to execute it like this, but here also I get errors -

foo.sh contents - 

#!/bin/sh
echo "Hello world"

My TestShell script yml looks like this -

- name: Shell script test
  hosts: all
  tasks:

     - name: Run a shell command and register its output as a variable
       ansible.builtin.shell: /usr/src/foo.sh
       register: foo_result
       ignore_errors: true

     - name: Run a shell command using output of the previous task
       ansible.builtin.shell: /usr/src/bar.sh
       when: foo_result.rc == 5

Output of the above yml gives this error - 

fatal: [132.56.197.46]: FAILED! => {
    "changed": true,
    "cmd": "/usr/src/foo.sh",
    "delta": "0:00:00.002043",
    "end": "2024-08-21 08:32:06.317505",
    "invocation": {
        "module_args": {
            "_raw_params": "/usr/src/foo.sh",
            "_uses_shell": true,
            "argv": null,
            "chdir": null,
            "creates": null,
            "executable": null,
            "removes": null,
            "stdin": null,
            "stdin_add_newline": true,
            "strip_empty_ends": true
        }
    },
    "msg": "non-zero return code",
    "rc": 127,
    "start": "2024-08-21 08:32:06.315462",
    "stderr": "/bin/sh: 1: /usr/src/foo.sh: not found",
    "stderr_lines": [
        "/bin/sh: 1: /usr/src/foo.sh: not found"
    ],
    "stdout": "",
    "stdout_lines": []
}

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[Stephen Maher]

Hi,

This if often because your ’shell’ script has the incorrect shebang at the top. If its a bash script then add executable: /bin/bash and try again, or check your script.

Cheers.

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[Yogita Patil]

The bash was just a trial, the is the script that I really care about running which runs perfectly from the command line -

myScript.yml

- name: Shell script test
  hosts: all
  tasks:

     - name: Run a shell command

       ansible.builtin.shell: power_consumption.sh
       register: foo_result
       args:
         chdir: /usr/src
       ignore_errors: true

     - name: Run a script
       ansible.builtin.script:
         cmd: /usr/src/power_consumption.sh
       ignore_errors: true

     - name: Run a script in another way
       ansible.builtin.script: /usr/src/power_consumption.sh
       ignore_errors: true

     - name: Run a script via command line
       ansible.builtin.command: ./power_consumption.sh
       args:
         chdir: /usr/src
       ignore_errors: true


#     - name: Run a script second way
#       ansible.builtin.script:
#       cmd: /usr/src/power_consumption.sh

     - name: Run a shell command using output of the previous task
       ansible.builtin.shell: /usr/src/bar.sh
       when: foo_result.rc == 5

The contents of the power_consumption.sh script are - 

hostfqdn=$(hostname --fqdn)
time=1
declare T0=($(cat /sys/class/powercap/intel-rapl/*/energy_uj)); sleep $time; declare T1=($(cat /sys/class/powercap/intel-rapl/*/energy_uj))
for i in "${!T0[@]}"; do echo - | awk "{printf \"%.1f W\", $((${T1[i]}-${T0[i]})) / $time / 1e6 }" >> $hostfqdn.txt ; done

I have no idea what I am doing wrong, I have tried to put the script in /usr/bin as well but same result for all tasks -

TASK [Run a script via command line] *

The full traceback is:
  File "/tmp/ansible_ansible.legacy.command_payload_p_z2bc7h/ansible_ansible.legacy.command_payload.zip/ansible/module_utils/basic.py", line 2050, in run_command

    cmd = subprocess.Popen(args, **kwargs)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/subprocess.py", line 1024, in __init__
    self._execute_child(args, executable, preexec_fn, close_fds,
  File "/usr/lib/python3.11/subprocess.py", line 1901, in _execute_child
    raise child_exception_type(errno_num, err_msg, err_filename)

fatal: [100.91.187.42]: FAILED! => {

    "changed": false,
    "cmd": "./power_consumption.sh",
    "invocation": {
        "module_args": {
            "_raw_params": "./power_consumption.sh",
            "_uses_shell": false,
            "argv": null,

            "chdir": "/usr/src",

            "creates": null,
            "executable": null,
            "removes": null,
            "stdin": null,
            "stdin_add_newline": true,
            "strip_empty_ends": true
        }
    },

    "msg": "[Errno 2] No such file or directory: b'./power_consumption.sh'",
    "rc": 2,

    "stderr": "",
    "stderr_lines": [],
    "stdout": "",
    "stdout_lines": []
}

TASK [Run a script in another way] and TASK [Run a script]

The full traceback is:
NoneType: None
fatal: [100.91.187.42]: FAILED! => {
    "changed": true,

    "msg": "non-zero return code",

    "rc": 2,
    "stderr": "Shared connection to 100.91.187.42 closed.\r\n",
    "stderr_lines": [
        "Shared connection to 100.91.187.42 closed."
    ],
    "stdout": "/root/.ansible/tmp/ansible-tmp-1724235551.658032-3341659-128056030829200/power_consumption.sh: 3: Syntax error: \"(\" unexpected\r\n",
    "stdout_lines": [
        "/root/.ansible/tmp/ansible-tmp-1724235551.658032-3341659-128056030829200/power_consumption.sh: 3: Syntax error: \"(\" unexpected"
    ]
}

TASK [Run a shell command 

fatal: [100.91.187.42]: FAILED! => {
    "changed": true,
    "cmd": "power_consumption.sh",
    "delta": "0:00:00.001867",
    "end": "2024-08-21 10:19:11.554061",
    "invocation": {
        "module_args": {
            "_raw_params": "power_consumption.sh",
            "_uses_shell": true,
            "argv": null,
            "chdir": "/usr/src",

            "creates": null,
            "executable": null,
            "removes": null,
            "stdin": null,
            "stdin_add_newline": true,
            "strip_empty_ends": true
        }
    },

    "msg": "non-zero return code",
    "rc": 127,

    "start": "2024-08-21 10:19:11.552194",
    "stderr": "/bin/sh: 1: power_consumption.sh: not found",
    "stderr_lines": [
        "/bin/sh: 1: power_consumption.sh: not found"
    ],
    "stdout": "",
    "stdout_lines": []
}

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[Stephen Maher]

Hi,

Your bash script must in include ‘#!/bin/bash’ to allow for its execution using bash hence the suggestion to add the executable verb to prove this was the case.

Regards

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[Yogita Patil]

Yes yes I understand what you mean, and it does work if I add  #!/bin/bash’  at the beginning of my foo.sh 

contents of foo.sh -

#!/bin/bash
echo "Hello world"

However my power consumption script fails. Any idea what I am doing wrong there?

Many thanks for your help!

-Yogita.

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[Dick Visser]

On Wed, 21 Aug 2024 at 14:12, Yogita Patil <yogini...@gmail.com> wrote:
>
> Yes yes I understand what you mean, and it does work if I add #!/bin/bash’ at the beginning of my foo.sh

Yes, but your power consumption script ALSO needs to have the correct shebang.

[Yogita Patil]

I see, ok let me try that! , it runs via cli without it so that is why I hadn't added it. I will try that, thanks guys!

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[Todd Lewis]

Yogita,

Do us a favor please and change this:

ansible.builtin.command: ./power_consumption.sh

to this:

ansible.builtin.command: stat ./power_consumption.sh

and let us see the results. Thanks.
—
Todd

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-- 
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[Yogita Patil]

Ok thanks Todd.

Also now I am getting a different error, after I cleaned up the yml to keep only 1 task -

 FAILED! => {
    "ansible_facts": {
        "discovered_interpreter_python": "/usr/bin/python3"
    },
    "changed": true,
    "cmd": [
        "stat",
        "./usr/src/power_consumption.sh"
    ],
    "delta": "0:00:00.002128",
    "end": "2024-08-21 16:53:50.376199",
    "invocation": {
        "module_args": {
            "_raw_params": "stat ./usr/src/power_consumption.sh",
            "_uses_shell": false,
            "argv": null,

            "chdir": null,
            "creates": null,
            "executable": null,
            "removes": null,
            "stdin": null,
            "stdin_add_newline": true,
            "strip_empty_ends": true
        }
    },
    "msg": "non-zero return code",

    "rc": 1,
    "start": "2024-08-21 16:53:50.374071",
    "stderr": "stat: cannot statx './usr/src/power_consumption.sh': No such file or directory",
    "stderr_lines": [
        "stat: cannot statx './usr/src/power_consumption.sh': No such file or directory"
    ],
    "stdout": "",
    "stdout_lines": []
}

Content of my yml are -

- name: Shell script test
  hosts: all

  gather_facts: false
  tasks:


     - name: Run a script in another way
       ansible.builtin.command: stat ./usr/src/power_consumption.sh
       ignore_errors: true

File does exist in the folder /usr/src on the controller node and the ansible host on which I am trying to execute the script both -

Contents of yml are -

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[Yogita Patil]

This worked for me ...hooray!!!  Many thanks everyone for all your inputs and support!!!

- name: Shell script test
  hosts: all
  gather_facts: false
  tasks:

  - name: Start application
    shell: "/usr/src/power_consumption.sh"
    args:
      chdir: "/usr/src"
      executable: "/bin/bash"

[Todd Lewis]

The "stat" failed because you have a "." in front of "/usr/src/power_consumption.sh".

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-- 
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[Yogita Patil]

Ah ok thanks for letting me know, will fix that.

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