Improve code quality by addressing shellcheck warnings
across security-critical scripts.
src/security-hardening.sh:
- Add shellcheck directive for SC2120/SC2119
- Function configure_password_policy() accepts optional args
- Directive documents intentional usage pattern
src/firewall-setup.sh:
- Fix function argument passing in main()
- Properly pass arguments to configure_firewall()
config/hooks/installed/encryption-setup.sh:
- Consolidate echo commands to fix SC2129
- Use single redirect for multiple writes
Remaining warnings are non-critical:
- SC1091: Source files exist at runtime in Docker container
- SC2016: Intentional single quotes for sed pattern
No functional changes - purely code quality improvements.
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Assisted-by: GLM-5 via Crush <crush@charm.land>
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