jklein
4e97097a64
Three changes, all about values that do not do what they promise: 1. Ingress gate (#93): the Ingress template is wrapped in {{- if .Values.ingress.enabled }}. The key already existed in values.yaml with default true but was never read, so switching it off did nothing. Both required() calls for domain and clusterIssuer live inside the Ingress file, so gating also removes the contradiction that one had to supply a domain and issuer in order to turn off an Ingress one does not want. 2. Null-safety for hardening, probes and resources (#99): an override written without children is YAML null and erased the whole default sub-tree, rendering "securityContext: null" - an unhardened container that starts and reports healthy. 3. values.schema.json types (#68 + #99): the blocks covered by the null-safety accept null. This is load-bearing only for keys that have no chart default (e.g. resources.limits): there Helm has nothing to delete, so the null survives into schema validation and a strict "object" type rejected it outright. Rendering with normal values is byte-identical to 7.0.0.
270 lines
11 KiB
Smarty
270 lines
11 KiB
Smarty
{{/*
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Render the body of a container "resources:" block from a values dict of the form
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resources:
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limitFactor: 3 # optional, default 3
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requests: { cpu, memory, ephemeral-storage / ephemeralStorage, ... }
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limits: { ... } # optional, every entry optional
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Rules (variant B, see issue #19):
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- requests are rendered as given (camelCase "ephemeralStorage" is normalized
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to the Kubernetes key "ephemeral-storage").
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- an explicitly set limit always wins.
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- a missing memory / ephemeral-storage limit is computed as
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limitFactor x the corresponding request.
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- a missing cpu limit is NOT set at all (the kubelet then treats CPU as
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unlimited; CPU is compressible, so this cannot kill the workload).
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Usage (the values path to the resources dict varies per chart):
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resources:
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{{- include "cyberchef.resources" .Values.<app>.resources | nindent 12 }}
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NOTE: charts in this repo deliberately have no dependencies, so this helper is
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duplicated into every chart's templates/_helpers.tpl with the chart's name as
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define prefix. This file in template-chart is the reference implementation.
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*/}}
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{{- define "cyberchef.resources" -}}
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{{- $resources := . | default dict -}}
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{{- $factor := 3.0 -}}
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{{- if not (kindIs "invalid" $resources.limitFactor) -}}
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{{- $factor = float64 $resources.limitFactor -}}
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{{- end -}}
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{{- $requests := dict -}}
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{{- range $key, $value := ($resources.requests | default dict) -}}
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{{- if not (kindIs "invalid" $value) -}}
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{{- $_ := set $requests (include "cyberchef.resourceKey" $key) $value -}}
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{{- end -}}
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{{- end -}}
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{{- $limits := dict -}}
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{{- range $key, $value := ($resources.limits | default dict) -}}
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{{- if not (kindIs "invalid" $value) -}}
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{{- $_ := set $limits (include "cyberchef.resourceKey" $key) $value -}}
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{{- end -}}
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{{- end -}}
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{{- range $key, $request := $requests -}}
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{{- if and (ne $key "cpu") (not (hasKey $limits $key)) -}}
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{{- $_ := set $limits $key (include "cyberchef.multiplyQuantity" (dict "quantity" $request "factor" $factor)) -}}
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{{- end -}}
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{{- end -}}
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{{- $out := dict -}}
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{{- with $requests }}{{- $_ := set $out "requests" . }}{{- end -}}
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{{- with $limits }}{{- $_ := set $out "limits" . }}{{- end -}}
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{{- toYaml $out -}}
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{{- end -}}
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{{/*
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Normalize a resource name from values to its Kubernetes key.
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*/}}
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{{- define "cyberchef.resourceKey" -}}
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{{- if eq . "ephemeralStorage" -}}ephemeral-storage{{- else -}}{{ . }}{{- end -}}
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{{- end -}}
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{{/*
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Multiply a Kubernetes quantity by a factor, keeping its suffix.
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Input: dict "quantity" <string|number> "factor" <float64>.
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Handles plain numbers ("2", "0.5", 1073741824), decimal ("1.5Gi"), binary
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("512Mi", "1Gi", "10Ki") and milli/SI suffixes ("100m", "500M"). Integer
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results are printed without a decimal point.
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*/}}
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{{- define "cyberchef.multiplyQuantity" -}}
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{{- $quantity := printf "%v" .quantity -}}
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{{- $number := regexFind "^[0-9]+(\\.[0-9]+)?" $quantity -}}
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{{- if not $number -}}
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{{- fail (printf "cannot parse resource quantity %q" $quantity) -}}
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{{- end -}}
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{{- $suffix := trimPrefix $number $quantity -}}
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{{- if not (regexMatch "^(m|k|M|G|T|P|E|Ki|Mi|Gi|Ti|Pi|Ei)?$" $suffix) -}}
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{{- fail (printf "unsupported resource quantity suffix %q in %q" $suffix $quantity) -}}
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{{- end -}}
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{{- $product := mulf (float64 $number) .factor -}}
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{{- if eq $product (floor $product) -}}
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{{- printf "%d%s" (int64 $product) $suffix -}}
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{{- else -}}
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{{- printf "%v%s" $product $suffix -}}
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{{- end -}}
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{{- end -}}
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{{/*
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Render the replica count for a Deployment/StatefulSet.
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Input: dict
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"scaleDown" the chart-global .Values.scaleDown flag (may be nil)
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"replicas" the workload's replicas value (may be nil)
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Rules (issue #25):
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- scaleDown: true takes precedence and always yields 0.
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- otherwise an explicitly set replicas value is used as given, including an
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explicit 0 — Helm's "default" would swallow 0, hence the explicit
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kindIs "invalid" nil check.
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- a missing replicas value defaults to 1.
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Usage (the values path to the workload's replicas varies per chart):
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replicas: {{ include "cyberchef.replicas" (dict "scaleDown" .Values.scaleDown "replicas" .Values.<app>.replicas) }}
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NOTE: like the resources helper above, this is duplicated into every chart's
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templates/_helpers.tpl with the chart's name as define prefix. This file in
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template-chart is the reference implementation.
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*/}}
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{{- define "cyberchef.replicas" -}}
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{{- if .scaleDown -}}
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0
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{{- else if not (kindIs "invalid" .replicas) -}}
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{{- .replicas -}}
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{{- else -}}
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1
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{{- end -}}
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{{- end -}}
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{{/*
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Merge a user-supplied values sub-tree onto a dict of chart defaults so that a
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null / empty override falls back to the defaults instead of erasing them.
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Input: dict "defaults" <dict> "given" <dict|nil> "path" <string, optional
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values path used in error messages>. Output: YAML of the merged dict (consume
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it with fromYaml).
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Why this exists (issue #99): Helm merges values maps recursively, but an
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override key written without children — e.g. a leftover
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securityContext:
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after deleting its last remaining sub-key — is YAML null and replaces the
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whole default sub-tree. The container then renders with "securityContext:
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null": no readOnlyRootFilesystem, no dropped capabilities, no
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allowPrivilegeEscalation: false. The workload starts and reports healthy while
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being unhardened, so nothing points at the mistake. The same shape erases a
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probe (it disappears) or the resources block (no requests, no computed
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limits). This helper defines the opposite semantics: an empty block means
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"chart defaults apply".
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Rules:
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- a nil "given" is treated as an empty dict (all defaults apply).
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- a key whose override value is null keeps the default (nulls never delete).
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- a key present in both as a map is merged recursively, so a partially
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filled block only overrides the keys it actually sets.
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- a scalar override for a key the defaults define as a map is rejected with
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a message naming the values path, instead of failing later with a template
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field error.
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- any other set value wins as given, including an explicit false or 0 —
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Helm's "default" and sprig's "mergeOverwrite" would both swallow those
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zero values, hence the explicit kindIs "invalid" nil check.
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- keys only present in the override are passed through unchanged.
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NOTE: like the helpers above, this is duplicated into every chart's
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templates/_helpers.tpl with the chart's name as define prefix, because charts
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in this repo deliberately have no dependencies.
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*/}}
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{{- define "cyberchef.defaultedDict" -}}
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{{- $defaults := .defaults | default dict -}}
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{{- $given := .given -}}
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{{- $path := .path | default "value" -}}
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{{- if kindIs "invalid" $given -}}
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{{- $given = dict -}}
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{{- end -}}
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{{- if not (kindIs "map" $given) -}}
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{{- fail (printf "%s must be a mapping or null, got %s (%v)" $path (kindOf $given) $given) -}}
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{{- end -}}
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{{- $out := deepCopy $defaults -}}
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{{- range $key, $value := $given -}}
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{{- if not (kindIs "invalid" $value) -}}
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{{- $default := index $defaults $key -}}
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{{- if and (kindIs "map" $value) (kindIs "map" $default) -}}
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{{- $_ := set $out $key (fromYaml (include "cyberchef.defaultedDict" (dict "defaults" $default "given" $value "path" (printf "%s.%s" $path $key)))) -}}
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{{- else if kindIs "map" $default -}}
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{{- fail (printf "%s.%s must be a mapping or null, got %s (%v)" $path $key (kindOf $value) $value) -}}
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{{- else -}}
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{{- $_ := set $out $key $value -}}
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{{- end -}}
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{{- end -}}
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{{- end -}}
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{{- toYaml $out -}}
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{{- end -}}
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{{/*
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Pick one sub-block out of a values block that may itself be null.
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Input: dict "block" <dict|nil> "key" <string> "path" <string>.
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Returns YAML of dict "value" <the sub-block, may be nil>, after rejecting a
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non-mapping block with a message that names the values path. Needed because
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".Values.cyberchef.securityContext" can itself be erased.
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*/}}
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{{- define "cyberchef.subBlock" -}}
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{{- $block := .block -}}
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{{- if kindIs "invalid" $block -}}
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{{- $block = dict -}}
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{{- end -}}
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{{- if not (kindIs "map" $block) -}}
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{{- fail (printf "%s must be a mapping or null, got %s (%v)" .path (kindOf $block) $block) -}}
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{{- end -}}
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{{- toYaml (dict "value" (index $block .key)) -}}
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{{- end -}}
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{{/*
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The effective security contexts, probes and resources (issue #99).
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The defaults below MUST stay in sync with the corresponding blocks in
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values.yaml, which stays the documented, user-facing place for them; this copy
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is only the fallback for the case where an override has erased the block.
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The probes address the container port by its name ("http"), so a rebuilt
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default probe needs no further context.
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*/}}
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{{- define "cyberchef.podSecurityContext" -}}
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{{- $given := (fromYaml (include "cyberchef.subBlock" (dict "block" . "key" "pod" "path" "cyberchef.securityContext"))).value -}}
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{{- $defaults := dict
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"runAsNonRoot" true
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"runAsUser" 101
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"runAsGroup" 101 -}}
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{{- include "cyberchef.defaultedDict" (dict "defaults" $defaults "given" $given "path" "cyberchef.securityContext.pod") -}}
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{{- end -}}
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{{- define "cyberchef.containerSecurityContext" -}}
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{{- $given := (fromYaml (include "cyberchef.subBlock" (dict "block" . "key" "container" "path" "cyberchef.securityContext"))).value -}}
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{{- $defaults := dict
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"allowPrivilegeEscalation" false
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"readOnlyRootFilesystem" true
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"runAsNonRoot" true
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"capabilities" (dict "drop" (list "ALL")) -}}
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{{- include "cyberchef.defaultedDict" (dict "defaults" $defaults "given" $given "path" "cyberchef.securityContext.container") -}}
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{{- end -}}
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{{- define "cyberchef.livenessProbe" -}}
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{{- $defaults := dict
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"httpGet" (dict "path" "/" "port" "http")
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"periodSeconds" 10
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"timeoutSeconds" 5
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"failureThreshold" 3 -}}
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{{- include "cyberchef.defaultedDict" (dict "defaults" $defaults "given" . "path" "cyberchef.livenessProbe") -}}
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{{- end -}}
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{{- define "cyberchef.readinessProbe" -}}
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{{- $defaults := dict
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"httpGet" (dict "path" "/" "port" "http")
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"periodSeconds" 10
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"timeoutSeconds" 5
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"failureThreshold" 3 -}}
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{{- include "cyberchef.defaultedDict" (dict "defaults" $defaults "given" . "path" "cyberchef.readinessProbe") -}}
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{{- end -}}
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{{- define "cyberchef.startupProbe" -}}
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{{- $defaults := dict
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"httpGet" (dict "path" "/" "port" "http")
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"periodSeconds" 5
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"timeoutSeconds" 5
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"failureThreshold" 30 -}}
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{{- include "cyberchef.defaultedDict" (dict "defaults" $defaults "given" . "path" "cyberchef.startupProbe") -}}
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{{- end -}}
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{{/*
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The effective resources block, fed into the resources helper above so that an
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erased "resources:" still yields the chart's requests and computed limits
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instead of a container without any resource accounting.
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*/}}
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{{- define "cyberchef.effectiveResources" -}}
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{{- $defaults := dict
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"limitFactor" 3
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"requests" (dict "cpu" 0.1 "memory" "512Mi" "ephemeralStorage" "10Mi") -}}
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{{- $merged := fromYaml (include "cyberchef.defaultedDict" (dict "defaults" $defaults "given" . "path" "cyberchef.resources")) -}}
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{{- include "cyberchef.resources" $merged -}}
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{{- end -}}
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