fix(cmd): retry clean tag logic for dockerhub (#1976)

This change will ensure that if the curl command for the cleaning of Docker tags on DockerHub fails it will be reattempted up to 2 more times (total of 3) with a 10 second sleep between each attempt.

The clean tag logic itself within curl attempts to execute the http request upto 3 times so this will ensure a maximum of 9 attempts.

cmd/authelia-scripts/cmd_docker.go

@@ -6,6 +6,7 @@ import (
 	"os"
 	"regexp"
 	"strings"
+	"time"
 
 	log "github.com/sirupsen/logrus"
 	"github.com/spf13/cobra"
@@ -57,27 +58,27 @@ func dockerBuildOfficialImage(arch string) error {
 		if buildkiteQEMU != stringTrue {
 			err := utils.CommandWithStdout("docker", "run", "--rm", "--privileged", "multiarch/qemu-user-static", "--reset", "-p", "yes").Run()
 			if err != nil {
-				panic(err)
+				log.Fatal(err)
 			}
 		}
 
 		err := utils.CommandWithStdout("bash", "-c", "wget https://github.com/multiarch/qemu-user-static/releases/download/"+qemuversion+"/qemu-arm-static -O ./qemu-arm-static && chmod +x ./qemu-arm-static").Run()
 
 		if err != nil {
-			panic(err)
+			log.Fatal(err)
 		}
 	} else if arch == "arm64v8" {
 		if buildkiteQEMU != stringTrue {
 			err := utils.CommandWithStdout("docker", "run", "--rm", "--privileged", "multiarch/qemu-user-static", "--reset", "-p", "yes").Run()
 			if err != nil {
-				panic(err)
+				log.Fatal(err)
 			}
 		}
 
 		err := utils.CommandWithStdout("bash", "-c", "wget https://github.com/multiarch/qemu-user-static/releases/download/"+qemuversion+"/qemu-aarch64-static -O ./qemu-aarch64-static && chmod +x ./qemu-aarch64-static").Run()
 
 		if err != nil {
-			panic(err)
+			log.Fatal(err)
 		}
 	}
 
@@ -118,7 +119,7 @@ var DockerBuildCmd = &cobra.Command{
 		err = docker.Tag(IntermediateDockerImageName, DockerImageName)
 
 		if err != nil {
-			panic(err)
+			log.Fatal(err)
 		}
 	},
 }
@@ -204,8 +205,11 @@ func deployManifest(docker *Docker, tag, amd64tag, arm32v7tag, arm64v8tag, regis
 		for _, t := range tags {
 			log.Infof("Docker removing tag for %s%s on Docker Hub", dockerImagePrefix, t)
 
-			if err := docker.CleanTag(t); err != nil {
-				panic(err)
+			if err := utils.RunFuncWithRetry(3, 10*time.Second, func() (err error) {
+				err = docker.CleanTag(t)
+				return
+			}); err != nil {
+				log.Fatal(err)
 			}
 		}
 	}

internal/utils/exec.go

@@ -147,3 +147,23 @@ func RunCommandWithTimeout(cmd *exec.Cmd, timeout time.Duration) error {
 		return err
 	}
 }
+
+// RunFuncWithRetry run a function for n attempts with a sleep of n duration between each attempt.
+func RunFuncWithRetry(attempts int, sleep time.Duration, f func() error) (err error) {
+	for i := 0; ; i++ {
+		err = f()
+		if err == nil {
+			return
+		}
+
+		if i >= (attempts - 1) {
+			break
+		}
+
+		time.Sleep(sleep)
+
+		log.Printf("Retrying after error: %s", err)
+	}
+
+	return fmt.Errorf("Failed after %d attempts, last error: %s", attempts, err)
+}