92 lines
2.1 KiB
Go
92 lines
2.1 KiB
Go
package run
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import (
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"errors"
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"fmt"
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"io"
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"os"
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"text/template"
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)
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// InitKube is a step in a helm Plan that initializes the kubernetes config file.
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type InitKube struct {
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SkipTLSVerify bool
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Certificate string
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APIServer string
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ServiceAccount string
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Token string
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TemplateFile string
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ConfigFile string
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template *template.Template
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configFile io.WriteCloser
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values kubeValues
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}
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type kubeValues struct {
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SkipTLSVerify bool
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Certificate string
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APIServer string
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Namespace string
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ServiceAccount string
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Token string
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}
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// Execute generates a kubernetes config file from drone-helm3's template.
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func (i *InitKube) Execute(cfg Config) error {
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if cfg.Debug {
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fmt.Fprintf(cfg.Stderr, "writing kubeconfig file to %s\n", i.ConfigFile)
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}
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defer i.configFile.Close()
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return i.template.Execute(i.configFile, i.values)
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}
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// Prepare ensures all required configuration is present and that the config file is writable.
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func (i *InitKube) Prepare(cfg Config) error {
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var err error
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if i.APIServer == "" {
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return errors.New("an API Server is needed to deploy")
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}
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if i.Token == "" {
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return errors.New("token is needed to deploy")
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}
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if i.ServiceAccount == "" {
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i.ServiceAccount = "helm"
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}
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if cfg.Debug {
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fmt.Fprintf(cfg.Stderr, "loading kubeconfig template from %s\n", i.TemplateFile)
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}
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i.template, err = template.ParseFiles(i.TemplateFile)
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if err != nil {
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return fmt.Errorf("could not load kubeconfig template: %w", err)
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}
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i.values = kubeValues{
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SkipTLSVerify: i.SkipTLSVerify,
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Certificate: i.Certificate,
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APIServer: i.APIServer,
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ServiceAccount: i.ServiceAccount,
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Token: i.Token,
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Namespace: cfg.Namespace,
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}
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if cfg.Debug {
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if _, err := os.Stat(i.ConfigFile); err != nil {
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// non-nil err here isn't an actual error state; the kubeconfig just doesn't exist
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fmt.Fprint(cfg.Stderr, "creating ")
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} else {
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fmt.Fprint(cfg.Stderr, "truncating ")
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}
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fmt.Fprintf(cfg.Stderr, "kubeconfig file at %s\n", i.ConfigFile)
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}
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i.configFile, err = os.Create(i.ConfigFile)
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if err != nil {
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return fmt.Errorf("could not open kubeconfig file for writing: %w", err)
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}
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return nil
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}
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