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nix: re-run the host's store fetches on a ten-minute timer

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Seven host oneshots fetch a secret from the swarm secret store into a file
their consumer loads at start: swarm-bao-grafana-oidc, swarm-bao-otel-oidc,
swarm-bao-matrix-oidc, swarm-bao-ci-runner, swarm-bao-forge-oidc,
swarm-bao-hive-otel-oidc and swarm-bao-forwarder-oidc. Each was
RemainAfterExit with no timer, so it ran at boot or deploy and never again:
a secret re-minted in the store reached its consumer only through an
operator restarting the fetch.

lib/store-refresh-timer.nix gives each one a timer (OnUnitInactiveSec 10min,
RandomizedDelaySec 1min, the agent's own store re-read interval), and each
drops RemainAfterExit so a timer start is not a no-op. Each script already
writes the file only when secret_differs, and refresh_consumer/refresh_unit
restart the consumer only when the file is newer than its last start, so a
run reading an unchanged value restarts nothing.

Two docs said these units do not run on a timer; credentials.md's
ci-runner row said the runner token is not re-pulled.

Part of #5017 (slice T).
This commit is contained in:
atlas 2026-10-12 20:21:17 +02:00 • committed by mara
commit 2f05e2db28
12 changed files with 146 additions and 13 deletions
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8
nix/host-modules/swarm-otel.nix
View file

@ -303,6 +303,7 @@ let
# its own trust material.
privateNetwork = false;
storeRetry = import ./lib/store-retry.nix { };
storeRefreshTimer = import ./lib/store-refresh-timer.nix { };
in
{
# What the collector IS to the swarm — the client it is registered as, where
@ -453,8 +454,9 @@ in
# the collector (below).
inherit (storeRetry) startLimitBurst startLimitIntervalSec;
serviceConfig = storeRetry.serviceConfig // {
# No `RemainAfterExit`: the timer below starts this again, and
# starting an active unit is a no-op.
Type = "oneshot";
RemainAfterExit = true;
SyslogIdentifier = "swarm-bao-otel-oidc";
# What actually bounds each attempt below. Stated here rather than left
# to systemd's default, so the number a boot waits on is in the file
@ -532,6 +534,10 @@ in
'';
};
systemd.timers.swarm-bao-otel-oidc = lib.mkIf haveClientIdentity (
storeRefreshTimer "re-read the swarm collector's OIDC client secret from the swarm secret store"
);
# Where the delivery unit above lands the secret. `mkDefault`, so a
# deployment delivering it some other way just sets the option — and
# `mkIf haveClientIdentity` so a host with no store identity is left with