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Per-feature rollback implementation patterns and tag conventions. Use when implementing rollback for specific features, managing UCI changes, or designing rollback procedures.
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| name | rollback-per-feature |
| description | Per-feature rollback implementation patterns and tag conventions. Use when implementing rollback for specific features, managing UCI changes, or designing rollback procedures. |
Per-feature rollback uses Ansible tags in cleanup.yml. Convention: --tags <feature>-rollback runs the inverse of --tags <feature>.
Feature Tags follow this pattern:
Feature Tags (current)
├── Apply: openwrt-security, openwrt-vlans, openwrt-dns, openwrt-mesh
└── Rollback: openwrt-security-rollback, openwrt-vlans-rollback, openwrt-dns-rollback, openwrt-mesh-rollback
Apply tags go in site.yml plays. Rollback tags go in cleanup.yml plays. Rollback plays are gated by their rollback-specific tags (e.g., openwrt-security-rollback) — you must pass --tags explicitly to invoke them. NEVER use Ansible's never special tag.
UCI changes on OpenWrt are atomic per uci commit. ALWAYS group related UCI changes into a single commit. Rollback reverses them with uci delete or uci set to defaults, then uci commit.
Per-feature rollback pattern (OpenWrt UCI):
# In playbooks/cleanup.yml
- name: Rollback security hardening
hosts: openwrt
tags: [openwrt-security-rollback]
gather_facts: false
tasks:
- name: Remove banIP and revert SSH config
ansible.builtin.raw: |
opkg remove banip 2>/dev/null
uci delete dropbear.@dropbear[0].PasswordAuth 2>/dev/null
uci delete dropbear.@dropbear[0].RootPasswordAuth 2>/dev/null
uci commit dropbear
/etc/init.d/dropbear restart
Rollback plays are gated by when: rollback | default(false) | bool. Invoke via: ansible-playbook cleanup.yml --tags openwrt-security-rollback -e rollback=true.
opkg remove. ALWAYS list installed packages in the feature's rollback procedure.deploy_stamp records what ran. Rollback tasks MUST check ansible_local.vm_builds.plays to determine what needs undoing. NEVER attempt to roll back a feature that was never applied.
Use deploy_stamp for idempotent feature application — skip expensive operations when the feature is already at the current version.
Rollback MUST fully restore the baseline auth/connection state. If a feature deploys SSH keys and disables password auth, rollback MUST re-enable password auth AND clear the root password (restoring empty-password baseline).
Partial auth rollback leaves the system in an undefined state — neither key nor password works.
cleanup.sh supports a rollback subcommand that delegates to build.py:
./cleanup.sh rollback security test.env
# → build.py --playbook cleanup --tags openwrt-security-rollback
The subcommand maps the feature name to the rollback tag using the convention openwrt-<feature>-rollback.
site.yml and cleanup.yml free of dead code.