69 lines
3.3 KiB
Markdown
69 lines
3.3 KiB
Markdown
# swarmctl
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Swarm-level operator CLI. Runs as **root on the host running
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`swarm-controller`**, and acts on that host directly.
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Distinct from `hivectl`, which drives one hive's `hive-c0re` over its
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admin socket. This crate does not link `swarm-controller`, for the same
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reason `hivectl` does not link `hive-c0re`.
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## Why root, and why no socket
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The first verb writes authelia's users database. Making that write
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rootless was examined and rejected — **relocating the file only turns a
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write problem into a read problem.** Move `users.yml` into a directory
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the controller owns and the controller can write it, but authelia then
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has to read it across the same boundary in the other direction. Making
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_that_ work needs either a hand-pinned gid (the container's uids are
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allocated inside it, at activation — see the uid-assignment issue) or
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world-readable password hashes. Both are worse than root.
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So there is no socket, no HTTP route and no privileged helper here. When
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a verb has to run as a non-root user or from another host, the answer is
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a **group-gated admin socket**, separate from the controller's `0666`
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gateway-facing one — not a widening of what root does here.
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## One file, two writers
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`users.yml` — authelia's own users database — is read and written
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directly. There is no second store.
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There used to be: a private `users.json` here, canonical, with `users.yml`
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rendered from it, while `swarm-authelia-bridge` kept its own pair against
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the _same_ physical file. Two canonical stores for one file is a seam, and
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it bit — a writer whose own JSON was missing could not tell "nothing here
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yet" from "someone else's users", and refused to write.
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The argument for the split was that it let this crate work without a YAML
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parser. It didn't: the JSON was read back on every run, so the round-trip
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was already being paid — the two files differed only in _format_.
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⚠️ The file is round-tripped, so **comments and hand-formatting do not
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survive a write**. Values do, and so do keys this binary does not model.
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See `swarm-authelia-bridge/README.md` for what both writers must uphold.
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## Configuration
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Every path comes from the nix module that installs the binary, because
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every one is derived from an option that module owns. They are required
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rather than defaulted — a default would be an address we _hope_ points at
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something, and one that resolves cleanly to the wrong place is worse than
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an error.
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| variable | what |
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| ------------------------------ | -------------------------------------------------------------------- |
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| `SWARMCTL_AUTHELIA_BIN` | the **configured** authelia; argon2 params must match the verifier's |
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| `SWARMCTL_AUTHELIA_USERS_FILE` | host-side path of the users database |
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| `SWARMCTL_AUTHELIA_MACHINE` | container name, for `systemctl -M` |
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| `SWARMCTL_AUTHELIA_UNIT` | authelia's unit inside that container |
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## Usage
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```console
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# swarmctl user add mara --display-name "Mara" --group admins
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```
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The password is **generated by authelia** (`crypto hash generate argon2
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--random`) and printed once. It is never passed on a command line:
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`/proc/<pid>/cmdline` is world-readable, so a password in argv is readable
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by any local process for the lifetime of the call.
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