forked from kubernetes/kops
/
apply.go
59 lines (50 loc) · 1.53 KB
/
apply.go
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package channels
import (
"fmt"
"github.com/golang/glog"
"io/ioutil"
"k8s.io/kops/util/pkg/vfs"
"os"
"os/exec"
"path"
"strings"
)
// Apply calls kubectl apply to apply the manifest.
// We will likely in future change this to create things directly (or more likely embed this logic into kubectl itself)
func Apply(manifest string) error {
// We copy the manifest to a temp file because it is likely e.g. an s3 URL, which kubectl can't read
data, err := vfs.Context.ReadFile(manifest)
if err != nil {
return fmt.Errorf("error reading manifest: %v", err)
}
tmpDir, err := ioutil.TempDir("", "channel")
if err != nil {
return fmt.Errorf("error creating temp dir: %v", err)
}
defer func() {
if err := os.RemoveAll(tmpDir); err != nil {
glog.Warningf("error deleting temp dir %q: %v", tmpDir, err)
}
}()
localManifestFile := path.Join(tmpDir, "manifest.yaml")
if err := ioutil.WriteFile(localManifestFile, data, 0600); err != nil {
return fmt.Errorf("error writing temp file: %v", err)
}
_, err = execKubectl("apply", "-f", localManifestFile)
return err
}
func execKubectl(args ...string) (string, error) {
kubectlPath := "kubectl" // Assume in PATH
cmd := exec.Command(kubectlPath, args...)
env := os.Environ()
cmd.Env = env
human := strings.Join(cmd.Args, " ")
glog.V(2).Infof("Running command: %s", human)
output, err := cmd.CombinedOutput()
if err != nil {
glog.Infof("error running %s", human)
glog.Info(string(output))
return string(output), fmt.Errorf("error running kubectl")
}
return string(output), err
}