[Bug 2136942] Re: The visudo command fails to read files passed via stdin

[Simon Johnsson]

** Merge proposal linked:
   https://code.launchpad.net/~bamf0/ubuntu/+source/rust-sudo-rs/+git/rust-sudo-rs/+merge/500546

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https://bugs.launchpad.net/bugs/2136942

Title:
  The visudo command fails to read files passed via stdin

Status in rust-sudo-rs package in Ubuntu:
  Fix Committed
Status in rust-sudo-rs source package in Questing:
  Triaged
Status in rust-sudo-rs source package in Resolute:
  Fix Committed

Bug description:
  Expected output (as seen in 24.04, 25.04):

  $ cat /etc/sudoers | visudo -c -f -
  stdin: parsed OK
  /etc/sudoers.d/90-cloud-init-users: parsed OK
  /etc/sudoers.d/README: parsed OK

  Actual output (as seen in 25.10):

  $ cat /etc/sudoers | visudo -c -f -
  visudo: unable to open -: No such file or directory (os error 2)

  Ansible's community.general.sudoers module hits this bug because it
  relies on sudo being able to consume stdin to do validation.

  Bug is fixed upstream:

  https://github.com/trifectatechfoundation/sudo-rs/issues/1358

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