kevinveenbirkenbachandClaude Opus 5
f85996b43a
checkmk's entrypoint runs `omd create --no-tmpfs`, so the site's tmp directory
is never mounted and the site cannot come up cleanly. Declaring it needs a tmpfs
with sticky, world-writable permissions, which the volume layer could not
express.
container_volumes built the tmpfs options as a hard-coded single key:
if mount.get("size") is not None:
tmpfs_entry["tmpfs"] = {"size": mount["size"]}
so a `mode` in the declaration was accepted by the schema and silently dropped by
the renderer. It now accumulates size and mode and attaches the key only when
something is set, coercing mode to the int docker expects. mounts.py validates
both the bind and tmpfs spellings through _is_octal_mode and names the expected
shape in the error, so `1777` or `0o1777` fails at render with a readable message
instead of producing the wrong bits.
Capability and consumer land together deliberately. Split apart, checkmk's
mode: "01777" would pass validation, be dropped at render, and the tmp directory
would come up without the sticky bit while everything reported success.
checkmk declares site_tmp as a tmpfs at the site's tmp path with size 512m and
mode 01777. The site name moves into services.checkmk.site, and CHECKMK_SITE
reads it through lookup('config', ...) instead of hard-coding "cmk", so the mount
target and the variable cannot drift.
MERGE NOTE: fork/feature/svc-net-tor carries acc9e25c0f, which deletes
plugins/filter/container_volumes.py and moves it to plugins/lookup/. That
relocated copy has the identical defect at lines 141-142 -- the same hard-coded
{"size": ...} -- and its _coerce_mode_int is wired only to the config-ref path.
It is not a competing fix, but this change will disappear at merge unless it is
re-applied in the lookup.
Verified: the unit suite passes, 4448 tests, including new coverage of the mode
path in test_container_volumes.py.
Not verified: checkmk has not been watched starting with this mount. Docker's
tmpfs mode also interacts with the container umask, so the effective bits on the
created directory were not inspected live. The new validation is fail-closed: a
role carrying a non-octal mode would now error at render rather than be ignored,
and while the suite is green, I did not grep every CHECKMK_SITE consumer for one
still assuming the literal "cmk".
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Ansible Plugins (plugins/) 🧩
This document is the central reference for plugin types and plugin placement in Infinito.Nexus.
Not to be confused with application addons. This
plugins/directory holds Ansible plugins (action / filter / lookup) that extend the automation engine itself. Some applications also call their own extensions "plugins" (e.g. Nextcloud, WordPress). Those application-level extensions, whatever the app calls them natively, are declared through the unifiedmeta/addons/contract, documented in Unified Addons. An app "plugin" is an addon; an Ansible plugin lives here.
Current Project Layout 🗂️
plugins/
├── action/ # custom action plugins
├── filter/ # custom Jinja2 filters
└── lookup/ # custom lookup plugins
Configured plugin paths in this repository are defined in ansible.cfg:
action_plugins = ./plugins/actionfilter_plugins = ./plugins/filterlookup_plugins = ./plugins/lookup
All Common Ansible Plugin Types 📚
The table below summarizes common Ansible plugin types and their conventional directory names.
| Emoji | Plugin Type | Conventional Directory | Purpose |
|---|---|---|---|
| ⚙️ | action |
action_plugins/ or plugins/action/ |
Wrap/extend module execution behavior at task runtime. |
| 🔐 | become |
become_plugins/ |
Implement privilege escalation methods. |
| 💾 | cache |
cache_plugins/ |
Persist gathered facts and cached data between runs. |
| 📣 | callback |
callback_plugins/ |
React to play/task events (logging, reporting, notifications). |
| 🖧 | cliconf |
cliconf_plugins/ |
Define CLI command transport behavior (mainly network platforms). |
| 🔌 | connection |
connection_plugins/ |
Control how Ansible connects to targets (ssh, local, etc.). |
| 🔍 | filter |
filter_plugins/ or plugins/filter/ |
Add Jinja2 filters for data transformation. |
| 🌐 | httpapi |
httpapi_plugins/ |
API transport layer over HTTP(S), mainly for network devices. |
| 🧭 | inventory |
inventory_plugins/ |
Build dynamic inventories from APIs, services, or files. |
| 👉 | lookup |
lookup_plugins/ or plugins/lookup/ |
Resolve dynamic values during playbook processing. |
| 🛰️ | netconf |
netconf_plugins/ |
NETCONF transport integration for network automation. |
| 🐚 | shell |
shell_plugins/ |
Adjust shell command wrapping/execution behavior. |
| 🧠 | strategy |
strategy_plugins/ |
Customize task scheduling/execution strategy. |
| ✅ | test |
test_plugins/ |
Add Jinja2 tests used in conditions and templates. |
| 📦 | vars |
vars_plugins/ |
Load variables from custom sources. |
Which Plugin Type to Use 🧭
action ⚙️
Use when task execution behavior itself must be changed or wrapped.
Examples:
- centralized retry logic (
uri_retry.py), - argument normalization before module dispatch,
- pre/post task orchestration.
filter 🔍
Use for pure data transformation in Jinja2 expressions.
Examples:
- mapping/normalizing dictionaries,
- deriving computed fields for templates,
- deterministic formatting helpers.
lookup 👉
Use when a value must be dynamically resolved at runtime.
Examples:
- computing IDs from role metadata,
- resolving paths/version data,
- reading structured project data for templates/tasks.
callback 📣
Use to hook into execution events and shape output/reporting.
inventory 🧭
Use when host/group data should come from a dynamic source.
strategy 🧠
Use to alter how tasks are scheduled/executed across hosts.
vars 📦
Use to load variables from custom backends.
connection, become, shell 🔌🔐🐚
Use to customize low-level execution and privilege mechanics.
cache 💾
Use to persist facts/results across runs for performance and consistency.
cliconf, httpapi, netconf 🖧🌐🛰️
Use in network automation contexts requiring protocol-specific transport behavior.
test ✅
Use to add custom Jinja2 test operators for conditional logic.
Best Practices 🧪
- Keep plugin interfaces explicit and stable.
- Keep plugin logic focused; move shared logic to
utils/. - Add unit tests for plugin behavior and integration tests for end-to-end flows.
- Prefer deterministic outputs and avoid hidden global state.
- Document any plugin-specific task arguments in the plugin docstring and README.
References 🔗
- Ansible plugin development: docs.ansible.com
- Ansible plugin index (all types): docs.ansible.com
- Ansible
ansible-docplugin types:ansible-doc -t ...