Can't copy file to LXC

[xaltsc]

SUMMARY

I am trying to copy a file to a LXC container, the following task hangs with the following command:

Task:

- name: Push config file
  ansible.builtin.copy:
    src: "config.yml"
    dest: "/etc/app/config.yml"
    mode: '0644'

Command:

<proxmox> EXEC sudo /usr/sbin/pct exec 100 -- /bin/sh -c 'cat > ~$USER/.ansible/tmp/ansible-tmp-1771349495.3212724-2287226-80401745570789/.source.yml'

ISSUE TYPE

• Bug Report

COMPONENT NAME

community.proxmox.proxmox_pct_remote

ANSIBLE VERSION

ansible [core 2.20.0]
  config file = None
  configured module search path = ['/home/ax/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /nix/store/27a8haczygaiasifk8kj94jkhwg5dyih-python3.13-ansible-core-2.20.0/lib/python3.13/site-packages/ansible
  ansible collection location = /home/ax/.ansible/collections:/usr/share/ansible/collections
  executable location = /nix/store/27a8haczygaiasifk8kj94jkhwg5dyih-python3.13-ansible-core-2.20.0/bin/ansible
  python version = 3.13.11 (main, Dec  5 2025, 16:06:33) [GCC 15.2.0] (/nix/store/slhpx9glq7vl99bwi93bgrhn3syv98s1-python3-3.13.11/bin/python3.13)
  jinja version = 3.1.6
  pyyaml version = 6.0.3 (with libyaml v0.2.5)

COLLECTION VERSION

# /nix/store/sbaqv1sfbg44qnhxw2c115ai8a7zk8qs-python3.13-ansible-13.1.0/lib/python3.13/site-packages/ansible_collections
Collection        Version
----------------- -------
community.proxmox 1.4.0  

CONFIGURATION

CONFIG_FILE() = /home/ax/docs/80-system/82-servers/82.10-server/ansible.cfg
DEFAULT_BECOME_ASK_PASS(/home/ax/docs/80-system/82-servers/82.10-server/ansible.cfg) = True
DEFAULT_HOST_LIST(/home/ax/docs/80-system/82-servers/82.10-server/ansible.cfg) = ['/home/ax/docs/80-system/82-servers/82.10-server/inventory/prod.yml', '/home/ax/docs/80-system/82-servers/82.10-server/inventory/services.yml']
DEFAULT_ROLES_PATH(/home/ax/docs/80-system/82-servers/82.10-server/ansible.cfg) = ['/home/ax/docs/80-system/82-servers/82.10-server/roles']
EDITOR(env: EDITOR) = nvim
PAGER(env: PAGER) = less

GALAXY_SERVERS:

OS / ENVIRONMENT

NixOS

STEPS TO REPRODUCE

lxc:
  hosts:
    app:
      ansible_host: proxmox
      ansible_user: ax
      ansible_connection: community.proxmox.proxmox_pct_remote
      proxmox_vmid: 100

- name: Push config file
  ansible.builtin.copy:
    src: "config.yml"
    dest: "/etc/app/config.yml"
    mode: '0644'

EXPECTED RESULTS

Ansible would copy the file.

ACTUAL RESULTS

Ansible hangs when running

<alammush> EXEC sudo /usr/sbin/pct exec 100 -- /bin/sh -c 'cat > ~ax/.ansible/tmp/ansible-tmp-1771349495.3212724-2287226-80401745570789/.source.yml'

[Thulium-Drake]

I've labeled it as a bug, but I think it's a "feature", I looked at the examples for this connection_plugin, but it seems to only use copy tasks that have content defined (instead of pointing to a file) or have remote_src (which means the file is already present in the container somewhere.

All this, combined with that the cat command seems to hang, I think it's waiting for input.