Merge pull request #1 from warm-metal/once

make sure each unit is executed only once

Dockerfile

@@ -1,5 +1,5 @@
 # Build the manager binary
-FROM golang:1.15 as builder
+FROM golang:1.16 as builder
 
 WORKDIR /workspace
 # Copy the Go Modules manifests

Makefile

@@ -1,6 +1,6 @@
 
 # Image URL to use all building/pushing image targets
-IMG ?= docker.io/warmmetal/kube-systemd-controller:v0.1.0
+IMG ?= docker.io/warmmetal/kube-systemd-controller:v0.1.1
 # Produce CRDs that work back to Kubernetes 1.11 (no version conversion)
 CRD_OPTIONS ?= "crd:trivialVersions=true,preserveUnknownFields=false"
 

config/manager/kustomization.yaml

@@ -13,4 +13,4 @@ kind: Kustomization
 images:
 - name: controller
   newName: docker.io/warmmetal/kube-systemd-controller
-  newTag: v0.1.0
+  newTag: v0.1.1

config/samples/install.yaml

@@ -267,7 +267,7 @@ spec:
         - --metrics-bind-address=127.0.0.1:8080
         command:
         - /manager
-        image: docker.io/warmmetal/kube-systemd-controller:v0.1.0
+        image: docker.io/warmmetal/kube-systemd-controller:v0.1.1
         imagePullPolicy: IfNotPresent
         livenessProbe:
           httpGet:

controllers/unit_controller.go

@@ -26,6 +26,7 @@ import (
 	"path/filepath"
 	"sort"
 	"strings"
+	"time"
 
 	"github.com/go-logr/logr"
 	"k8s.io/apimachinery/pkg/runtime"
@@ -41,7 +42,7 @@ type UnitReconciler struct {
 	Log    logr.Logger
 	Scheme *runtime.Scheme
 
-	Executed map[string]bool
+	SysUpTime time.Time
 }
 
 const (
@@ -73,7 +74,8 @@ func (r *UnitReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.
 
 	nextUnits := make([]*corev1.Unit, 0, len(list.Items))
 	for i := range list.Items {
-		if !r.Executed[list.Items[i].Name] {
+		unit := list.Items[i]
+		if len(unit.Status.Error) > 0 || !unit.Status.ExecTimestamp.After(r.SysUpTime) {
 			nextUnits = append(nextUnits, &list.Items[i])
 		}
 	}
@@ -86,6 +88,11 @@ func (r *UnitReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.
 	for i := range nextUnits {
 		unit := nextUnits[i]
 		unit.Status.ExecTimestamp = now
+		// It may lead to the container exit to restart some unit
+		if err := r.Status().Update(ctx, unit); err != nil {
+			return ctrl.Result{}, err
+		}
+
 		err := startUnit(ctx, unit)
 		if err != nil {
 			unit.Status.Error = err.Error()
@@ -98,8 +105,6 @@ func (r *UnitReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.
 		if err != nil {
 			return ctrl.Result{}, err
 		}
-
-		r.Executed[unit.Name] = true
 	}
 
 	return ctrl.Result{}, nil

main.go

@@ -19,6 +19,8 @@ package main
 import (
 	"flag"
 	"os"
+	"syscall"
+	"time"
 
 	// Import all Kubernetes client auth plugins (e.g. Azure, GCP, OIDC, etc.)
 	// to ensure that exec-entrypoint and run can make use of them.
@@ -72,11 +74,17 @@ func main() {
 		os.Exit(1)
 	}
 
+	var sys syscall.Sysinfo_t
+	if err := syscall.Sysinfo(&sys); err != nil {
+		setupLog.Error(err, "unable to fetch the system uptime")
+		os.Exit(1)
+	}
+
 	if err = (&controllers.UnitReconciler{
-		Client:   mgr.GetClient(),
-		Log:      ctrl.Log.WithName("controllers").WithName("Unit"),
-		Scheme:   mgr.GetScheme(),
-		Executed: make(map[string]bool),
+		Client:    mgr.GetClient(),
+		Log:       ctrl.Log.WithName("controllers").WithName("Unit"),
+		Scheme:    mgr.GetScheme(),
+		SysUpTime: time.Now().Add(-1 * time.Duration(sys.Uptime) * time.Second),
 	}).SetupWithManager(mgr); err != nil {
 		setupLog.Error(err, "unable to create controller", "controller", "Unit")
 		os.Exit(1)