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chart2json.nix
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chart2json.nix
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{ runCommand, lib, kubernetes-helm, yq }:
with lib;
{
# chart to template
chart
# release name
, name
# namespace to install release into
, namespace ? null
# values to pass to chart
, values ? { }
# kubernetes version to template chart for
, kubeVersion ? null
# whether to include CRD
, includeCRDs ? false
# whether to include hooks
, noHooks ? false
# Kubernetes api versions used for Capabilities.APIVersions (--api-versions)
, apiVersions ? null
}:
let
valuesJsonFile = builtins.toFile "${name}-values.json" (builtins.toJSON values);
# The `helm template` and YAML -> JSON steps are separate `runCommand` derivations for easier debuggability
resourcesYaml = runCommand "${name}.yaml" { nativeBuildInputs = [ kubernetes-helm ]; } ''
helm template "${name}" \
${optionalString (apiVersions != null && apiVersions != []) "--api-versions ${lib.strings.concatStringsSep "," apiVersions}"} \
${optionalString (kubeVersion != null) "--kube-version ${kubeVersion}"} \
${optionalString (namespace != null) "--namespace ${namespace}"} \
${optionalString (values != {}) "-f ${valuesJsonFile}"} \
${optionalString includeCRDs "--include-crds"} \
${optionalString noHooks "--no-hooks"} \
${chart} >$out
'';
in
runCommand "${name}.json" { } ''
# Remove null values
${yq}/bin/yq -Scs 'walk(
if type == "object" then
with_entries(select(.value != null))
elif type == "array" then
map(select(. != null))
else
.
end)' ${resourcesYaml} >$out
''