pub const EXIT_UNAVAILABLE: i32 = 77;Expand description
Exit status when a subcommand is unavailable because the running host
lacks the feature behind it (see host_feature_gate_rejects). Distinct
from a usage error (2) and a runtime failure (1) so that a caller probing
for the feature, as TuneD does with
bootc loader-entries set-options-for-source --help, can tell
“not supported here” from “failed”. 77 is the status test harnesses use
for “skipped”.