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reloader.go
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reloader.go
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package cmd
import (
"os"
"github.com/sirupsen/logrus"
"github.com/spf13/cobra"
"github.com/stakater/Reloader/internal/pkg/controller"
"github.com/stakater/Reloader/internal/pkg/options"
"github.com/stakater/Reloader/internal/pkg/util"
"github.com/stakater/Reloader/pkg/kube"
v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)
// NewReloaderCommand starts the reloader controller
func NewReloaderCommand() *cobra.Command {
cmd := &cobra.Command{
Use: "reloader",
Short: "A watcher for your Kubernetes cluster",
Run: startReloader,
}
// options
cmd.PersistentFlags().StringVar(&options.ConfigmapUpdateOnChangeAnnotation, "configmap-annotation", "configmap.reloader.stakater.com/reload", "annotation to detect changes in configmaps")
cmd.PersistentFlags().StringVar(&options.SecretUpdateOnChangeAnnotation, "secret-annotation", "secret.reloader.stakater.com/reload", "annotation to detect changes in secrets")
cmd.PersistentFlags().StringVar(&options.ReloaderAutoAnnotation, "auto-annotation", "reloader.stakater.com/auto", "annotation to detect changes in secrets")
cmd.PersistentFlags().StringSlice("resources-to-ignore", []string{}, "list of resources to ignore (valid options 'configMaps' or 'secrets')")
return cmd
}
func startReloader(cmd *cobra.Command, args []string) {
var ignoreList util.List
var err error
logrus.Info("Starting Reloader")
currentNamespace := os.Getenv("KUBERNETES_NAMESPACE")
if len(currentNamespace) == 0 {
currentNamespace = v1.NamespaceAll
logrus.Warnf("KUBERNETES_NAMESPACE is unset, will detect changes in all namespaces.")
}
// create the clientset
clientset, err := kube.GetKubernetesClient()
if err != nil {
logrus.Fatal(err)
}
ignoreList, err = cmd.Flags().GetStringSlice("resources-to-ignore")
if err != nil {
logrus.Fatal(err)
}
for _, v := range ignoreList {
if v != "configMaps" && v != "secrets" {
logrus.Fatalf("'resources-to-ignore' only accepts 'configMaps' or 'secrets', not '%s'", v)
}
}
if len(ignoreList) > 1 {
logrus.Fatal("'resources-to-ignore' only accepts 'configMaps' or 'secrets', not both")
}
for k := range kube.ResourceMap {
if ignoreList.Contains(k) {
continue
}
c, err := controller.NewController(clientset, k, currentNamespace)
if err != nil {
logrus.Fatalf("%s", err)
}
// Now let's start the controller
stop := make(chan struct{})
defer close(stop)
logrus.Infof("Starting Controller to watch resource type: %s", k)
go c.Run(1, stop)
}
// Wait forever
select {}
}