The function used a chain of `(( NEED_X == 1 )) && { ... }` statements.
When the last flag is 0 the trailing arithmetic evaluates to false and
bash returns 1 from the function. Under the main script's `set -e` that
propagates up to bootstrap which exits with the misleading "line 60"
ERR trap right after the installer announces it is going to create the
state directory.
Rewrite the body as plain `if` blocks and return 0 explicitly. Add two
regression assertions that exercise the "only some flags set" and
"nothing to do" paths so the class of bug is caught in CI.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
