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Resolve symlinks before lstat on a device file #7006

@MagicRB

Description

@MagicRB

Description

When containerd goes to check whether a particular device listed in the Spec is an actual dev, char or fifo it doesn't first resolve symlinks, therefore it fails on stable device nodes created by udev and such.

Steps to reproduce the issue

  1. Start containerd
  2. Start a container with a device pointing to /dev/serial/by-id/...
  3. Error

Describe the results you received and expected

rpc error: code = Unknown desc = Error in creating container: not a device node

What version of containerd are you using?

1.6.4

Any other relevant information

No response

Show configuration if it is related to CRI plugin.

No response

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