CI / pytest and ruff (push) Successful in 5m6s
GNU df refuses -i together with --output, so the script stopped right
after mounting the container ("options -i and --output are mutually
exclusive"). The iused field needs no -i: use df --output=iused.
The df stub in the tests accepted the combination and hid the bug; it now
rejects it the way GNU df does.
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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>