Both from claude-bot's review of #128.
storage_driver's two driver probes had no '|| true' while the pool probe one
line up did. They were safe only via a bash subtlety: command substitution
strips errexit, so a failing 'incus storage show' fell through to the fallback
instead of aborting. Add 'shopt -s inherit_errexit' to bin/box — the class of
robustness tweak #107 documents sailing through review — and under pipefail a
restricted tier's probe refusal becomes a fatal abort mid-mint, inside the
function whose contract is NEVER fatal. All three probes now read alike and
depend on nothing. Driven test: refuse both probes with inherit_errexit on,
assert the caller survives and the driver reads empty (the unreadable-pool
case, which already takes the mark anyway).
The clone's inheritance narration piped a multi-line 'incus snapshot list'
straight into 'grep -q' — #124's racing-reader class in a 'set -euo pipefail'
file. A 141 there reads as "no pristine" and narrates the WRONG inheritance
shape on a clone that does carry one. Capture first, then read. Pinned by
shape (grep|head|sed|awk|read), not by instance spelling.
bin/box has ~10 more sites of that class and no sweep covers the file; one of
them unpins an exposure's static address on a fail-open read. Filed as #134
rather than widened into this PR.
Refs #104, #107, #124, #134.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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