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main.go
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main.go
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package main
import (
"fmt"
"io/ioutil"
"os"
"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 (
// GCR JSON key file path
gcrKeyPath string = "/kaniko/config.json"
gcrEnvVariable string = "GOOGLE_APPLICATION_CREDENTIALS"
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 gcr plugin"
app.Usage = "kaniko gcr 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: "gcr repository",
EnvVar: "PLUGIN_REPO",
},
cli.StringSliceFlag{
Name: "custom-labels",
Usage: "additional k=v labels",
EnvVar: "PLUGIN_CUSTOM_LABELS",
},
cli.StringFlag{
Name: "registry",
Usage: "gcr registry",
Value: "gcr.io",
EnvVar: "PLUGIN_REGISTRY",
},
cli.StringFlag{
Name: "json-key",
Usage: "docker username",
EnvVar: "PLUGIN_JSON_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 as --verbosity=<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 {
noPush := c.Bool("no-push")
jsonKey := c.String("json-key")
// only setup auth when pushing or credentials are defined
if !noPush || jsonKey != "" {
if err := setupGCRAuth(jsonKey); 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.GCR,
},
}
return plugin.Exec()
}
func setupGCRAuth(jsonKey string) error {
if jsonKey == "" {
return fmt.Errorf("GCR JSON key must be specified")
}
err := ioutil.WriteFile(gcrKeyPath, []byte(jsonKey), 0644)
if err != nil {
return errors.Wrap(err, "failed to write GCR JSON key")
}
err = os.Setenv(gcrEnvVariable, gcrKeyPath)
if err != nil {
return errors.Wrap(err, fmt.Sprintf("failed to set %s environment variable", gcrEnvVariable))
}
return nil
}