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swarm-controller: mint each hive's matrix sender token

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A hive whose homeserver runs on another host has no local
matrix-appservice-token, so hive-c0re's matrix sweep returned before
reaching the store read in ensure_hive_user: no @hive-<name>: token, no
Space, no chat room, no invites, and a sweep-health banner.

swarm-controller now mints @hive-<name>: with the swarm appservice
token for every hive in its directory, as a MintHiveSenderToken job
node queued by a five-minute pass, and stores it at
swarm/hives/<name>/matrix/sender-token, the same matrix::Credential
swarm-matrix-ctl writes there. It is keep-if-live, reusing agent_token's
classify/plan: a stored token whoami confirms as @hive-<name>: is left
alone, so only an absent or dead one is minted. agent_token's probe and
mint steps are lifted into probe_at/mint_at so both passes share them.

swarm-matrix-ctl mint still writes the path for its own hive when it is
empty. If both mint an empty path at once, one token is invalidated
(same pinned device); the next pass classifies it Revoked and re-mints.

hive-c0re's ensure_all no longer returns when there is no local
as_token. ensure_hive_user reads the store first on every sweep and
overwrites its token file when the store's token differs, keeps the
file when the store has none, mints with the local as_token only when
neither holds one, and fails with one error when there is nothing at
all. The decision is sender_source, unit-tested.

The controller's bao policy gains create/read/update on
swarm/hives/+/matrix/sender-token (`+`, since `*` is a glob only at the
end of a path), pinned in module-eval.

Refs #4427
This commit is contained in:
atlas 2026-09-29 20:18:11 +02:00 • committed by mara
commit 78d8d69c7f
10 changed files with 504 additions and 80 deletions
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6
nix/host-modules/swarm-bao.nix
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@ -372,6 +372,8 @@ let
# instead of rotating it. `metadata/` is the revocation half: `delete` on
# `data/` only soft-deletes the newest version, and `+` being one path segment
# keeps this to the queue leaf alone.
# Each hive's matrix sender token (`matrix_account::hive_sender`) grants `read`
# for the same keep-if-live reason, and `+` for the same glob-only-as-last-segment reason.
#
# The swarm appservice token and its own OIDC client secret, read-only: it
# uses both and writes neither. matrix-ctl publishes the token
@ -404,6 +406,10 @@ let
capabilities = ["delete"]
}
path "${credentialMountPath}/data/swarm/hives/+/matrix/sender-token" {
capabilities = ["create", "read", "update"]
}
path "${credentialMountPath}/data/${swarmAppserviceTokenLeaf}" {
capabilities = ["read"]
}