A tool to take a deployed set of kubernetes resources and turn them into a helm release. Only works with helm3 > 3.2.0
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package exporters
import (
"encoding/json"
"regexp"
v1 "k8s.io/api/apps/v1"
"sigs.k8s.io/yaml"
)
// Deployment removes basic stuff like namespace, status, managedBy and lastAppliedConfiguration
func Deployment(deploy *v1.Deployment, jqcommands []string, nobuiltinmods bool, chartname string, lessOpinions bool) string {
if !nobuiltinmods {
// All the below do not belong in a helm chart yaml
delete(deploy.ObjectMeta.Annotations, "kubectl.kubernetes.io/last-applied-configuration")
delete(deploy.ObjectMeta.Annotations, "deployment.kubernetes.io/revision")
deploy.ObjectMeta.ManagedFields = nil
deploy.ObjectMeta.Namespace = ""
deploy.ObjectMeta.ResourceVersion = ""
deploy.ObjectMeta.Generation = 0
deploy.ObjectMeta.SelfLink = ""
deploy.ObjectMeta.UID = ""
jqcommands = append(jqcommands, "del(.metadata.creationTimestamp)")
jqcommands = append(jqcommands, "del(.status)")
if !lessOpinions {
jqcommands = append(jqcommands, ".metadata.name = \"{{ $fullName }}\"")
jqcommands = append(jqcommands, ".spec.replicas = \"{{ .values.replicaCount }}\"")
jqcommands = append(jqcommands, ".metadata.labels += {HELMTEMPLATEDELETEKEY: \"{{- include \\\""+chartname+".labels\\\" . | nindent 4 }}\"}")
jqcommands = append(jqcommands, ".metadata.annotations += {HELMTEMPLATEDELETEKEY: \"{{- include \\\""+chartname+".annotations\\\" . | nindent 4 }}\"}")
// damn, "checksum/config" works as a key in yaml, not in json!
jqcommands = append(jqcommands, ".metadata.annotations += {checksumConfig: \"{{- include (print $.Template.BasePath \\\"/configmap.yaml\\\") . | sha256sum }}\"}")
jqcommands = append(jqcommands, ".metadata.annotations += {checksumSecret: \"{{- include (print $.Template.BasePath \\\"/secret.yaml\\\") . | sha256sum }}\"}")
jqcommands = append(jqcommands, ".spec.selector.matchLabels += {HELMTEMPLATEDELETEKEY: \"{{- include \\\""+chartname+".selectorLabels\\\" . | nindent 6 }}\"}")
jqcommands = append(jqcommands, ".spec.template.metadata.labels += {HELMTEMPLATEDELETEKEY: \"{{- include \\\""+chartname+".labels\\\" . | nindent 8 }}\"}")
jqcommands = append(jqcommands, ".spec.template.metadata.annotations += {HELMTEMPLATEDELETEKEY: \"{{- include \\\""+chartname+".annotations\\\" . | nindent 8 }}\"}")
jqcommands = append(jqcommands, ".spec.template.spec.serviceAccountName = \"{{ include \\\""+chartname+".serviceAccountName\\\" . }}\"")
jqcommands = append(jqcommands, ".spec.template.spec.securityContext += {HELMTEMPLATEDELETEKEY: \"{{- toYaml .podSecurityContext | nindent 8 }}\"}")
jqcommands = append(jqcommands, ".spec.template.spec.containers[0].env += [{HELMTEMPLATEDELETEKEYANDARRAYMARKER: \"{{- range $key, $value := .Values."+chartname+".env }}\"}]")
jqcommands = append(jqcommands, ".spec.template.spec.containers[0].env += [{ name: \"{{ $key }}\", valueFrom: {configMapKeyRef: {name: \"{{ $fullName }}\", key: \"{{ $key | quote }}\" }} }]")
jqcommands = append(jqcommands, ".spec.template.spec.containers[0].env += [{HELMTEMPLATEDELETEKEYANDARRAYMARKER: \"{{- end }}\"}]")
jqcommands = append(jqcommands, ".spec.template.spec.containers[0].env += [{HELMTEMPLATEDELETEKEYANDARRAYMARKER: \"{{- range $key, $value := .Values."+chartname+".secretenv }}\"}]")
jqcommands = append(jqcommands, ".spec.template.spec.containers[0].env += [{ name: \"{{ $key }}\", valueFrom: {secretKeyRef: {name: \"{{ $fullName }}\", key: \"{{ $key | quote }}\" }} }]")
jqcommands = append(jqcommands, ".spec.template.spec.containers[0].env += [{HELMTEMPLATEDELETEKEYANDARRAYMARKER: \"{{- end }}\"}]")
}
}
// Jump to json for jq ;-)
jsonForm, err := json.Marshal(deploy)
if err != nil {
panic(err.Error())
}
var intermediateJSONForm []byte
var finalJSONForm []byte
if len(jqcommands) > 0 {
for _, command := range jqcommands {
intermediateJSONForm = jQOnJSONByteArray(command, jsonForm)
jsonForm = intermediateJSONForm
}
finalJSONForm = jsonForm
} else {
finalJSONForm = jsonForm
}
y, err := yaml.JSONToYAML(finalJSONForm)
if err != nil {
panic(err.Error())
}
ret := "{{- $fullName := include \"" + chartname + ".fullname\" . -}}\n"
ret += "kind: Deployment\n"
ret += "apiVersion: Apps/v1\n"
out := string(y)
var re = regexp.MustCompile(`HELMTEMPLATEDELETEKEY: '([^']*)'`)
out = re.ReplaceAllString(out, "$1")
re = regexp.MustCompile(`(?s)- HELMTEMPLATEDELETEKEYANDARRAYMARKER: '([^']*)'`)
out = re.ReplaceAllString(out, "$1")
ret += string(out)
return ret
}