helm-charts/stalwart/Chart.yaml

apiVersion: v2
name: stalwart
description: A Helm chart to deploy a cluster-capable Stalwart mail server (SMTP, IMAP, JMAP, ManageSieve) on Kubernetes
icon: https://avatars.githubusercontent.com/u/76623657

type: application

# appVersion is the exact image tag, and the "v" is part of it - so it is part
# of appVersion and of the "+up" suffix. Precedent: calibre-web-automated
# (+upv4.0.6), matrix-synapse (+upv1.159.0), ytdlp-web-player (+upv1.2.0).
#
# The glibc image, not "-alpine". Both flavours are published for every release
# from the same source and carry the same uid/gid 2000 and the same two volumes;
# the choice is a deployment decision, and keeping it out of the tag is what
# lets renovate.json5 anchor the version with a plain three-part regex instead
# of maintaining a compatibility suffix. The moving tags "latest", "v0.16" and
# their -alpine twins are excluded by that same anchor: measured on 2026-10-02
# all three of latest / v0.16 / v0.16.24 resolved to one digest pushed seconds
# apart, so either floating name would change the running image with no commit
# in this repository and nothing to report it.
# MINOR, not major, and the evidence is a diff rather than a judgement. That
# held for the per-group spread constraint and PodDisruptionBudget of Gitea #96
# (both gated on the COMPUTED replica count being >= 2, and the chart ships
# full: 1 / mx: 0) and it holds again for the MTA-STS routes of Gitea #123: the
# list is the switch and it ships EMPTY, so no object is added and no value
# becomes required in either routing mode. `helm template` against the previous
# version renders byte-for-byte identically for the defaults AND for
# ci/stalwart/test-values.yaml as it stands on origin/main - measured, both
# empty diffs. New optional values with unchanged defaults is exactly the minor
# case (README, "Versioning").
version: 2.0.0+upv0.16.25
appVersion: "v0.16.25"

maintainers:
  - name: jklein

# The second chart in this repo with a dependency (after ytdlp-web-player).
# README, "Chart dependencies", holds the bar it has to clear and the price;
# both are restated here because the price is paid by whoever reads this file
# next, not by whoever added the line.
#
# WHY ONE HERE. Stalwart's in-memory store is not a cache that can be dropped:
# from v0.16 it also carries the cluster coordinator ("the Default variant
# reuses the Redis connection already configured on the in-memory store"), so a
# multi-node install does not work without it. Redis/Valkey is admissible as
# the in-memory store ONLY - never as the data or blob store. Offering it inside
# the chart means the wiring (host, port, egress rule) is in one place instead
# of split across two releases that have to agree.
#
# WHY IT IS OFF BY DEFAULT: an installation that already runs a Valkey points
# externalServices.valkey.host at it and this dependency renders nothing. The
# subchart is the path for an installation that has none.
#
# THE SUBCHART IS OUR OWN valkey CHART, resolved from the published index -
# NOT upstream's. So guideline 14.2 ("we consume their chart as it comes") does
# not apply here and there is nothing of someone else's to leave unpatched: the
# subchart follows this repo's conventions because it IS this repo's chart. What
# does apply is everything about the subchart being invisible downstream, plus
# one hazard that a self-referencing dependency adds and an external one does
# not - see the PR-ordering warning below.
dependencies:
  - name: valkey
    # KEEP THIS VERSION MOVING - it is the only path a Valkey update has.
    #
    # A subchart is invisible to everything downstream that watches Helm release
    # versions: what this file declares is baked into our packaged .tgz, and
    # Fleet only ever sees the version of "stalwart". So a new valkey chart - a
    # security fix included - reaches a cluster ONLY when this line is raised
    # and a new stalwart version is published. Nothing reports the gap.
    #
    # Renovate's BUILT-IN helmv3 manager reads this block and opens the PR (no
    # customManagers entry exists or would help - repository and version sit
    # together in one file, which is the case that manager is for), and
    # ci/renovate-bump-chart.sh bumps this chart's patch version, which is what
    # actually ships it. That chain is the whole safety net; switched off, this
    # line needs a human on a calendar instead.
    #
    # MEASURED, not assumed, because the registry is self-hosted and the version
    # carries build metadata - two things that could each have broken the chain
    # silently. Renovate 44.132.2, dry run on 2026-10-02 with this dependency
    # pinned at a lower version: manager helmv3 matched the file, took
    # registryUrls from the line below, and offered
    #   newVersion: "1.0.0+up9.1.2.alpine", versioning: "helm"
    # with the release timestamp read from our index. So both the self-hosted
    # index and the "+up..." suffix are handled.
    #
    # Independent of appVersion: raising it is a patch or minor bump of this
    # chart and is never tied to the Stalwart image.
    version: "1.0.0+up9.1.2.alpine"
    # Our own published index, and the READ path only. It is anonymously
    # readable - measured 2026-10-02: GET .../index.yaml returns 200 without
    # credentials - so ci/helm-dependencies.sh needs no secret and was not
    # touched. Verified with an empty HELM_REPOSITORY_CONFIG, i.e. the state a
    # fresh runner is in: helm reports "Getting updates for unmanaged Helm
    # repositories" and resolves the exact build-metadata version from the URL
    # alone, with no "helm repo add" anywhere. Both "helm dependency update" and
    # "helm dependency build" were tried.
    #
    # The PUBLISH target and its credentials still live in 1Password and appear
    # nowhere in this repository - see README, "CI/CD".
    repository: "https://git.jk-dev.de/api/packages/jlab-cluster/helm"
    # Off by default, so a plain install renders none of its objects.
    #
    # NOT "valkey.enabled", AND THAT IS NOT A STYLE CHOICE. Everything under the
    # "valkey:" key is passed to the subchart as its values, and our valkey
    # chart ships a values.schema.json with additionalProperties: false and no
    # "enabled" property - so "valkey.enabled" is rejected by the SUBCHART:
    #   Error: values don't meet the specifications of the schema(s) in the
    #   following chart(s): valkey: - at '': additional properties 'enabled'
    #   not allowed
    # Measured. Worse, Helm skips a disabled subchart's schema validation, so
    # the error appears only for whoever first sets it to true - the default
    # path renders clean.
    #
    # The condition is therefore a key of OUR OWN, outside the subchart's value
    # subtree, which is also the honest shape: "enabled" is not a valkey value.
    # It only ever looked like one because upstream's schema was permissive.
    # The alternative - adding "enabled" to valkey/values.schema.json - would
    # have to be its own PR and be published first (see the warning below), for
    # a key that chart does not read.
    condition: valkeySubchart.enabled
#
# !!! NEVER CHANGE valkey/ AND THIS CHART IN THE SAME PULL REQUEST !!!
#
# The hazard a self-referencing dependency adds. This dependency resolves out of
# the PUBLISHED index, not out of the working tree, and valkey/ is only
# published by a push to main that touches it. So in one PR carrying both:
#
#   - every helm command here - lint, package, render, AND the install-test -
#     pulls the OLD valkey .tgz, because the new one does not exist yet;
#   - the PR therefore goes green against a version of the subchart that is not
#     the one in the diff, and the diff to valkey/ is reviewed while nothing
#     actually exercised it;
#   - after the merge both charts publish, and the first install of the new
#     stalwart is the first time the new valkey is used anywhere.
#
# Two consecutive pull requests instead: change valkey/, merge, let it publish,
# then raise the version here. The ordering is not a nicety - the green check on
# the combined PR is a statement about the wrong artifact.