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main.go
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main.go
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package main
import (
"context"
"fmt"
"io/ioutil"
"os"
"strings"
"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"
"github.com/joho/godotenv"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"github.com/urfave/cli"
kaniko "github.com/drone/drone-kaniko"
"github.com/drone/drone-kaniko/cmd/artifact"
)
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: "context",
Usage: "build context",
Value: ".",
EnvVar: "PLUGIN_CONTEXT",
},
cli.StringSliceFlag{
Name: "tags",
Usage: "build tags",
Value: &cli.StringSlice{"latest"},
EnvVar: "PLUGIN_TAGS",
FilePath: ".tags",
},
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.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",
},
}
if err := app.Run(os.Args); err != nil {
logrus.Fatal(err)
}
}
func run(c *cli.Context) error {
registry := c.String("registry")
accessKey := c.String("access-key")
noPush := c.Bool("no-push")
// only setup auth when pushing or credentials are defined
if !noPush || accessKey != "" {
if err := setupECRAuth(accessKey, c.String("secret-key"), registry); err != nil {
return err
}
// only create repository when pushing and create-repository is true
if !noPush && c.Bool("create-repository") {
if err := createRepository(c.String("region"), c.String("repo"), registry); err != nil {
return err
}
}
}
plugin := kaniko.Plugin{
Build: kaniko.Build{
Dockerfile: c.String("dockerfile"),
Context: c.String("context"),
Tags: c.StringSlice("tags"),
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"),
},
Artifact: kaniko.Artifact{
Tags: c.StringSlice("tags"),
Repo: c.String("repo"),
Registry: c.String("registry"),
ArtifactFile: c.String("artifact-file"),
RegistryType: artifact.ECR,
},
}
return plugin.Exec()
}
func setupECRAuth(accessKey, secretKey, registry string) error {
if registry == "" {
return 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 errors.Wrap(err, fmt.Sprintf("failed to set %s environment variable", accessKeyEnv))
}
err = os.Setenv(secretKeyEnv, secretKey)
if err != nil {
return errors.Wrap(err, fmt.Sprintf("failed to set %s environment variable", secretKeyEnv))
}
}
jsonBytes := []byte(fmt.Sprintf(`{"credStore": "ecr-login", "credHelpers": {"%s": "ecr-login", "%s": "ecr-login"}}`, ecrPublicDomain, registry))
err := ioutil.WriteFile(dockerConfigPath, jsonBytes, 0644)
if err != nil {
return errors.Wrap(err, "failed to create docker config file")
}
return 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
switch {
// create public repo if registry string starts with public domain (ex: public.ecr.aws/example-registry)
case strings.HasPrefix(registry, ecrPublicDomain):
svc := ecrpublic.NewFromConfig(cfg)
_, createErr = svc.CreateRepository(context.TODO(), &ecrpublic.CreateRepositoryInput{RepositoryName: &repo})
// create private repo
default:
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
}