Round-1 convergence from all three reviewers, both findings real:
A version string used to be a path fragment: 'box uninstall
../../../.ssh' resolved below versions/ and rm -rf'd wherever it
landed, 'box use' could point current outside the root, and a hostile
flat-tree VERSION could steer the migration's mv the same way. One
strict validator now gates every caller — only [A-Za-z0-9._+-], no
leading '.' or '-' — byte-identical in install.sh and bin/box like
existing_boxes, diff-guarded in the tests, with traversal regressions
on use, uninstall and the migration (which now refuses BEFORE the tree
moves anywhere).
--force is uninstall's installer-family consent, and --purge-host now
forwards it: teardown-host.sh gets --yes under --force/BOX_YES, so the
combined non-interactive uninstall no longer dies at teardown's own
prompt. CI's drill now runs the combined verb with --force alone (no
BOX_YES, no TTY) — the exact invocation that used to abort.
Also grok's polish, taken: current flips by rename (ln to a side name,
mv -Tf over — no window with no current) in both install.sh and 'box
use'; BOX_REINSTALL swaps by two renames and deletes LAST; and the
single-version path refuses while current is dangling (readlink -f
resolves a missing last component, so the guard checks the DIRECTORY,
not just the string).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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