feat: add retries to app volume remove

pkg/client/volumes.go

@@ -2,15 +2,17 @@ package client
 
 import (
 	"context"
+	"fmt"
+	"time"
 
 	"github.com/docker/docker/api/types/filters"
 	"github.com/docker/docker/api/types/volume"
 	"github.com/docker/docker/client"
+	"github.com/sirupsen/logrus"
 )
 
 func GetVolumes(cl *client.Client, ctx context.Context, server string, fs filters.Args) ([]*volume.Volume, error) {
-	volumeListOptions := volume.ListOptions{fs}
-	volumeListOKBody, err := cl.VolumeList(ctx, volumeListOptions)
+	volumeListOKBody, err := cl.VolumeList(ctx, volume.ListOptions{Filters: fs})
 	volumeList := volumeListOKBody.Volumes
 	if err != nil {
 		return volumeList, err
@@ -29,13 +31,32 @@ func GetVolumeNames(volumes []*volume.Volume) []string {
 	return volumeNames
 }
 
-func RemoveVolumes(cl *client.Client, ctx context.Context, server string, volumeNames []string, force bool) error {
+func RemoveVolumes(cl *client.Client, ctx context.Context, volumeNames []string, force bool, retries int) error {
 	for _, volName := range volumeNames {
-		err := cl.VolumeRemove(ctx, volName, force)
+		err := retryFunc(5, func() error {
+			return cl.VolumeRemove(context.Background(), volName, force)
+		})
 		if err != nil {
-			return err
+			return fmt.Errorf("volume %s: %s", volName, err)
 		}
 	}
-
 	return nil
 }
+
+// retryFunc retries the given function for the given retries. After the nth
+// retry it waits (n + 1)^2 seconds before the next retry (starting with n=0).
+// It returns an error if the function still failed after the last retry.
+func retryFunc(retries int, fn func() error) error {
+	for i := 0; i < retries; i++ {
+		err := fn()
+		if err == nil {
+			return nil
+		}
+		if i+1 < retries {
+			sleep := time.Duration(i+1) * time.Duration(i+1)
+			logrus.Infof("%s: waiting %d seconds before next retry", err, sleep)
+			time.Sleep(sleep * time.Second)
+		}
+	}
+	return fmt.Errorf("%d retries failed", retries)
+}