run_cvd: Improve tap device validation error messages#2601
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Refactor ValidateTapInterfaceUnused to check if the interface exists
first, avoiding misleading "Operation not permitted" errors when the
device simply does not exist.
Update ValidateTapDevices to remove the assumption that another device
is running, while keeping the actionable suggestions (cvd reset, pkill).
Also remove redundant "Device in use" messages in TestTapDevices to
keep logs terse.
Bug: 512536991
Test: Built it with a intentionally incorrect interface name, ensured
output stated interface did not exist instead of a misleading error
Flag: EXEMPT BUGFIX
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May 26, 2026
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Refactor ValidateTapInterfaceUnused to check if the interface exists first, avoiding misleading "Operation not permitted" errors when the device simply does not exist.
Update ValidateTapDevices to remove the assumption that another device is running, while keeping the actionable suggestions (cvd reset, pkill).
Also remove redundant "Device in use" messages in TestTapDevices to keep logs terse.
Bug: 512536991
Test: Built it with a intentionally incorrect interface name, ensured
output stated interface did not exist instead of a misleading error