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main.go
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main.go
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package main
import (
"bytes"
"flag"
"log"
"os"
"strings"
"github.com/pkg/errors"
kurlversion "github.com/replicatedhq/kurl/pkg/version"
kurlscheme "github.com/replicatedhq/kurlkinds/client/kurlclientset/scheme"
kurlv1beta1 "github.com/replicatedhq/kurlkinds/pkg/apis/cluster/v1beta1"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/client-go/kubernetes/scheme"
)
func main() {
utilruntime.Must(kurlscheme.AddToScheme(scheme.Scheme))
version := flag.Bool("v", false, "Print version info")
configPath := flag.String("c", "", "docker config file name")
yamlSpecPath := flag.String("s", "", "base yaml file name")
flag.Parse()
if *version {
kurlversion.Print()
return
}
if *configPath == "" || *yamlSpecPath == "" {
flag.PrintDefaults()
os.Exit(-1)
}
if err := saveConfig(*configPath, *yamlSpecPath); err != nil {
log.Fatal(err)
}
}
func saveConfig(configPath string, yamlSpecPath string) error {
config, err := getDockerConfigFromYaml(yamlSpecPath)
if err != nil {
return errors.Wrap(err, "failed to load config")
}
if len(config) == 0 {
// don't mess with file's existence and permissions if both configs are empty
return nil
}
// TODO: preserve permissions
if err := os.WriteFile(configPath, config, 0644); err != nil {
return errors.Wrapf(err, "failed to write file %s", configPath)
}
return nil
}
func getDockerConfigFromYaml(yamlPath string) ([]byte, error) {
yamlData, err := os.ReadFile(yamlPath)
if err != nil {
return nil, errors.Wrapf(err, "failed to load file %s", yamlPath)
}
yamlData = bytes.TrimSpace(yamlData)
if len(yamlData) == 0 {
return nil, nil
}
decode := scheme.Codecs.UniversalDeserializer().Decode
obj, gvk, err := decode(yamlData, nil, nil)
if err != nil {
return nil, errors.Wrap(err, "failed to decode installer yaml")
}
if gvk.Group != "cluster.kurl.sh" || gvk.Version != "v1beta1" || gvk.Kind != "Installer" {
return nil, errors.Errorf("installer yaml contained unepxected gvk: %s/%s/%s", gvk.Group, gvk.Version, gvk.Kind)
}
installer := obj.(*kurlv1beta1.Installer)
if installer.Spec.Docker == nil {
return nil, nil
}
return []byte(strings.TrimSpace(installer.Spec.Docker.DaemonConfig)), nil
}