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main.go
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main.go
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package main
import (
"context"
"encoding/json"
"fmt"
"github.com/drone/drone-kaniko/pkg/tagger"
"io/ioutil"
"os"
"strings"
"github.com/aws/aws-sdk-go-v2/aws"
"github.com/aws/aws-sdk-go-v2/config"
"github.com/aws/aws-sdk-go-v2/service/ecr"
"github.com/aws/aws-sdk-go-v2/service/ecrpublic"
"github.com/aws/smithy-go"
kaniko "github.com/drone/drone-kaniko"
"github.com/drone/drone-kaniko/pkg/artifact"
"github.com/drone/drone-kaniko/pkg/docker"
"github.com/joho/godotenv"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"github.com/urfave/cli"
)
const (
accessKeyEnv string = "AWS_ACCESS_KEY_ID"
secretKeyEnv string = "AWS_SECRET_ACCESS_KEY"
dockerConfigPath string = "/kaniko/.docker/config.json"
ecrPublicDomain string = "public.ecr.aws"
defaultDigestFile string = "/kaniko/digest-file"
)
var (
version = "unknown"
)
func main() {
// Load env-file if it exists first
if env := os.Getenv("PLUGIN_ENV_FILE"); env != "" {
if err := godotenv.Load(env); err != nil {
logrus.Fatal(err)
}
}
app := cli.NewApp()
app.Name = "kaniko docker plugin"
app.Usage = "kaniko docker plugin"
app.Action = run
app.Version = version
app.Flags = []cli.Flag{
cli.StringFlag{
Name: "dockerfile",
Usage: "build dockerfile",
Value: "Dockerfile",
EnvVar: "PLUGIN_DOCKERFILE",
},
cli.StringFlag{
Name: "docker-username",
Usage: "docker username",
EnvVar: "PLUGIN_USERNAME,DOCKER_USERNAME",
},
cli.StringFlag{
Name: "docker-password",
Usage: "docker password",
EnvVar: "PLUGIN_PASSWORD,DOCKER_PASSWORD",
},
cli.StringFlag{
Name: "context",
Usage: "build context",
Value: ".",
EnvVar: "PLUGIN_CONTEXT",
},
cli.StringFlag{
Name: "commit.ref",
Usage: "git commit ref",
EnvVar: "DRONE_COMMIT_REF",
},
cli.StringFlag{
Name: "repo.branch",
Usage: "repository default branch",
EnvVar: "DRONE_REPO_BRANCH",
},
cli.StringSliceFlag{
Name: "tags",
Usage: "build tags",
Value: &cli.StringSlice{},
EnvVar: "PLUGIN_TAGS",
FilePath: ".tags",
},
cli.BoolFlag{
Name: "expand_tags",
Usage: "enable for semver tagging",
EnvVar: "PLUGIN_EXPAND_TAGS",
},
cli.BoolFlag{
Name: "tags.auto",
Usage: "enable auto generate build tags",
EnvVar: "PLUGIN_AUTO_TAG",
},
cli.StringFlag{
Name: "tags.auto_suffix",
Usage: "the suffix of auto build tags",
EnvVar: "PLUGIN_AUTO_TAG_SUFFIX",
},
cli.StringSliceFlag{
Name: "args",
Usage: "build args",
EnvVar: "PLUGIN_BUILD_ARGS",
},
cli.StringFlag{
Name: "target",
Usage: "build target",
EnvVar: "PLUGIN_TARGET",
},
cli.StringFlag{
Name: "repo",
Usage: "docker repository",
EnvVar: "PLUGIN_REPO",
},
cli.BoolFlag{
Name: "create-repository",
Usage: "create ECR repository",
EnvVar: "PLUGIN_CREATE_REPOSITORY",
},
cli.StringFlag{
Name: "region",
Usage: "AWS region",
Value: "us-east-1",
EnvVar: "PLUGIN_REGION",
},
cli.StringSliceFlag{
Name: "custom-labels",
Usage: "additional k=v labels",
EnvVar: "PLUGIN_CUSTOM_LABELS",
},
cli.StringFlag{
Name: "registry",
Usage: "ECR registry",
EnvVar: "PLUGIN_REGISTRY",
},
cli.StringFlag{
Name: "access-key",
Usage: "ECR access key",
EnvVar: "PLUGIN_ACCESS_KEY",
},
cli.StringFlag{
Name: "secret-key",
Usage: "ECR secret key",
EnvVar: "PLUGIN_SECRET_KEY",
},
cli.StringFlag{
Name: "snapshot-mode",
Usage: "Specify one of full, redo or time as snapshot mode",
EnvVar: "PLUGIN_SNAPSHOT_MODE",
},
cli.StringFlag{
Name: "lifecycle-policy",
Usage: "Path to lifecycle policy file",
EnvVar: "PLUGIN_LIFECYCLE_POLICY",
},
cli.StringFlag{
Name: "repository-policy",
Usage: "Path to repository policy file",
EnvVar: "PLUGIN_REPOSITORY_POLICY",
},
cli.BoolFlag{
Name: "enable-cache",
Usage: "Set this flag to opt into caching with kaniko",
EnvVar: "PLUGIN_ENABLE_CACHE",
},
cli.StringFlag{
Name: "cache-repo",
Usage: "Remote repository that will be used to store cached layers. Cache repo should be present in specified registry. enable-cache needs to be set to use this flag",
EnvVar: "PLUGIN_CACHE_REPO",
},
cli.IntFlag{
Name: "cache-ttl",
Usage: "Cache timeout in hours. Defaults to two weeks.",
EnvVar: "PLUGIN_CACHE_TTL",
},
cli.StringFlag{
Name: "artifact-file",
Usage: "Artifact file location that will be generated by the plugin. This file will include information of docker images that are uploaded by the plugin.",
EnvVar: "PLUGIN_ARTIFACT_FILE",
},
cli.BoolFlag{
Name: "no-push",
Usage: "Set this flag if you only want to build the image, without pushing to a registry",
EnvVar: "PLUGIN_NO_PUSH",
},
cli.StringFlag{
Name: "verbosity",
Usage: "Set this flag with value as oneof <panic|fatal|error|warn|info|debug|trace> to set the logging level for kaniko. Defaults to info.",
EnvVar: "PLUGIN_VERBOSITY",
},
cli.StringFlag{
Name: "platform",
Usage: "Allows to build with another default platform than the host, similarly to docker build --platform",
EnvVar: "PLUGIN_PLATFORM",
},
}
if err := app.Run(os.Args); err != nil {
logrus.Fatal(err)
}
}
func run(c *cli.Context) error {
repo := c.String("repo")
registry := c.String("registry")
region := c.String("region")
noPush := c.Bool("no-push")
dockerConfig, err := createDockerConfig(
c.String("docker-username"),
c.String("docker-password"),
c.String("access-key"),
c.String("secret-key"),
registry,
noPush,
)
if err != nil {
return err
}
jsonBytes, err := json.Marshal(dockerConfig)
if err != nil {
return err
}
if err := ioutil.WriteFile(dockerConfigPath, jsonBytes, 0644); err != nil {
return err
}
// only create repository when pushing and create-repository is true
if !noPush && c.Bool("create-repository") {
if err := createRepository(region, repo, registry); err != nil {
return err
}
}
if c.IsSet("lifecycle-policy") {
contents, err := ioutil.ReadFile(c.String("lifecycle-policy"))
if err != nil {
logrus.Fatal(err)
}
if err := uploadLifeCyclePolicy(region, repo, string(contents)); err != nil {
logrus.Fatal(fmt.Sprintf("error uploading ECR lifecycle policy: %v", err))
}
}
if c.IsSet("repository-policy") {
contents, err := ioutil.ReadFile(c.String("repository-policy"))
if err != nil {
logrus.Fatal(err)
}
if err := uploadRepositoryPolicy(region, repo, registry, string(contents)); err != nil {
logrus.Fatal(fmt.Sprintf("error uploading ECR lifecycle policy: %v", err))
}
}
enableAutoTag := c.Bool("tags.auto")
enableExpandTag := c.Bool("tags.expand")
tags, shouldSkipBuild, err := tagger.MaybeAutoTag(c.StringSlice("tags"), c.String("commit.ref"), c.String("tags.auto_suffix"), c.String("repo.branch"), enableAutoTag, enableExpandTag)
if shouldSkipBuild {
return err
}
plugin := kaniko.Plugin{
Build: kaniko.Build{
Dockerfile: c.String("dockerfile"),
Context: c.String("context"),
Tags: tags,
ExpandTag: !enableAutoTag && enableExpandTag,
Args: c.StringSlice("args"),
Target: c.String("target"),
Repo: fmt.Sprintf("%s/%s", c.String("registry"), c.String("repo")),
Labels: c.StringSlice("custom-labels"),
SnapshotMode: c.String("snapshot-mode"),
EnableCache: c.Bool("enable-cache"),
CacheRepo: fmt.Sprintf("%s/%s", c.String("registry"), c.String("cache-repo")),
CacheTTL: c.Int("cache-ttl"),
DigestFile: defaultDigestFile,
NoPush: noPush,
Verbosity: c.String("verbosity"),
Platform: c.String("platform"),
},
Artifact: kaniko.Artifact{
Tags: tags,
Repo: c.String("repo"),
Registry: c.String("registry"),
ArtifactFile: c.String("artifact-file"),
RegistryType: artifact.ECR,
},
}
return plugin.Exec()
}
func createDockerConfig(dockerUsername, dockerPassword, accessKey, secretKey, registry string, noPush bool) (*docker.Config, error) {
dockerConfig := docker.NewConfig()
if dockerUsername != "" {
dockerConfig.SetAuth(docker.RegistryV1, dockerUsername, dockerPassword)
}
// only setup auth when pushing or credentials are defined
if !noPush || accessKey != "" {
if registry == "" {
return nil, fmt.Errorf("registry must be specified")
}
// If IAM role is used, access key & secret key are not required
if accessKey != "" && secretKey != "" {
err := os.Setenv(accessKeyEnv, accessKey)
if err != nil {
return nil, errors.Wrap(err, fmt.Sprintf("failed to set %s environment variable", accessKeyEnv))
}
err = os.Setenv(secretKeyEnv, secretKey)
if err != nil {
return nil, errors.Wrap(err, fmt.Sprintf("failed to set %s environment variable", secretKeyEnv))
}
}
dockerConfig.SetCredHelper(ecrPublicDomain, "ecr-login")
dockerConfig.SetCredHelper(registry, "ecr-login")
}
return dockerConfig, nil
}
func createRepository(region, repo, registry string) error {
if registry == "" {
return fmt.Errorf("registry must be specified")
}
if repo == "" {
return fmt.Errorf("repo must be specified")
}
cfg, err := config.LoadDefaultConfig(context.TODO(), config.WithRegion(region))
if err != nil {
return errors.Wrap(err, "failed to load aws config")
}
var createErr error
//create public repo
//if registry string starts with public domain (ex: public.ecr.aws/example-registry)
if isRegistryPublic(registry) {
svc := ecrpublic.NewFromConfig(cfg)
_, createErr = svc.CreateRepository(context.TODO(), &ecrpublic.CreateRepositoryInput{RepositoryName: &repo})
//create private repo
} else {
svc := ecr.NewFromConfig(cfg)
_, createErr = svc.CreateRepository(context.TODO(), &ecr.CreateRepositoryInput{RepositoryName: &repo})
}
var apiError smithy.APIError
if errors.As(createErr, &apiError) && apiError.ErrorCode() != "RepositoryAlreadyExistsException" {
return errors.Wrap(createErr, "failed to create repository")
}
return nil
}
func uploadLifeCyclePolicy(region, repo, lifecyclePolicy string) (err error) {
cfg, err := config.LoadDefaultConfig(context.TODO(), config.WithRegion(region))
if err != nil {
return errors.Wrap(err, "failed to load aws config")
}
svc := ecr.NewFromConfig(cfg)
input := &ecr.PutLifecyclePolicyInput{
LifecyclePolicyText: aws.String(lifecyclePolicy),
RepositoryName: aws.String(repo),
}
_, err = svc.PutLifecyclePolicy(context.TODO(), input)
return err
}
func uploadRepositoryPolicy(region, repo, registry, repositoryPolicy string) (err error) {
cfg, err := config.LoadDefaultConfig(context.TODO(), config.WithRegion(region))
if err != nil {
return errors.Wrap(err, "failed to load aws config")
}
if isRegistryPublic(registry) {
svc := ecrpublic.NewFromConfig(cfg)
input := &ecrpublic.SetRepositoryPolicyInput{
PolicyText: aws.String(repositoryPolicy),
RepositoryName: aws.String(repo),
}
_, err = svc.SetRepositoryPolicy(context.TODO(), input)
} else {
svc := ecr.NewFromConfig(cfg)
input := &ecr.SetRepositoryPolicyInput{
PolicyText: aws.String(repositoryPolicy),
RepositoryName: aws.String(repo),
}
_, err = svc.SetRepositoryPolicy(context.TODO(), input)
}
return err
}
func isRegistryPublic(registry string) bool {
return strings.HasPrefix(registry, ecrPublicDomain)
}