Using "-" as filename to read config from stdin does not work

[kke]

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• You are running the latest released version of k0s
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Platform

Any

Version

All since at least #1409

Sysinfo

No response

What happened?

Reading the config from stdin is broken. The docs for the config flag claim - can be used to read the config from stdin.

Steps to reproduce

$ k0s config validate --help
...
Flags:
  -c, --config string          config file, use '-' to read the config from stdin (default "/etc/k0s/k0s.yaml")
...

$ echo hello | k0s config validate --config -
Cannot access config file (-)" error="open -: no such file or directory

Expected behavior

Either it should work or it shouldn't claim reading from stdin is supported.

Actual behavior

It tries to open a file called -.

Screenshots and logs

No response

Additional context

The config.GetCmdOpts() should maybe return (CLIOptions, error) instead of just CLIOptions. It now uses log.Fatalf to bail out, which is a bit problematic for command tests.

Slightly related to #2791

[github-actions]

The issue is marked as stale since no activity has been recorded in 30 days

[github-actions]

The issue is marked as stale since no activity has been recorded in 30 days

[kke]

It's still broken, #3072 fixes it for at least k0s config validate.

[github-actions]

The issue is marked as stale since no activity has been recorded in 30 days

[github-actions]

The issue is marked as stale since no activity has been recorded in 30 days