Two assumptions about the runner environment, both found by the Gitea
probe of #225 and both wrong on GitHub as well - they simply could not
show there.
CLUSTER NAME. Every leg created a cluster called "install-test". On
GitHub each matrix leg gets its own VM with its own Docker daemon, so
two legs never saw each other and the fixed name looked fine for two
years. Gitea runs all legs of a matrix CONCURRENTLY in ONE job on ONE
daemon, and there it collides immediately: one leg logs "Re-using
existing network 'k3d-install-test'", the other dies on "The container
name /k3d-install-test-server-0 is already in use", and then the first
leg's rollback deletes the shared network under the second. Two red
legs, and neither message names the cause. The cluster is now named
after the chart, in the create step and in the delete step - a blanket
cleanup would tear down the neighbour's cluster, which was the half of
the collision that turned one failure into two. ci/run-install-test.sh
never touches k3d, so nothing else had to move.
The bare chart name rather than a prefixed one, measured not assumed:
k3d v5.9.0 accepts a cluster name of 32 characters and rejects 33
("Cluster name must be <= 32 characters"), and the longest chart here is
calibre-web-automated at 21. "install-test-<chart>" would be 34 - it
would break that one chart and no other, which is worse than the fixed
name because it only sometimes breaks. A guard states the limit instead
of leaving it to be rediscovered.
KUBECTL. It was inherited from the runner image. The Gitea image has
none ("kubectl: command not found", 0 seconds into the chart install),
but that is how it was noticed, not why it is being changed: a client
version that arrives with the image drifts with every image rebuild, and
an install-test should run against a known one. GitHub's image carrying
one only makes the drift invisible there. Pinned to v1.35.5 to match the
K3S_IMAGE it talks to, tracked by Renovate the same way TRIVY_VERSION
is, and guarded against skew: kubectl supports one minor away from the
server, Renovate moves KUBECTL_VERSION on its own, and K3S_IMAGE is
tracked by nothing. Dry run proves both directions - the rule extracts
(kubernetes/kubernetes, github-releases) and it fires (from v1.34.0 the
lookup offers v1.37.0, minor). That same measurement shows the guard is
not theoretical: Renovate jumps several minors in one PR, so it will go
red on purpose, naming which pin to move.
jklein
301fc0d4e5