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76 lines
2.2 KiB
Go
76 lines
2.2 KiB
Go
// Package kubepod provides connhelper for kube-pod://<pod>
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package kubepod
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import (
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"context"
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"net"
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"net/url"
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"regexp"
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"github.com/docker/cli/cli/connhelper/commandconn"
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"github.com/moby/buildkit/client/connhelper"
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"github.com/pkg/errors"
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)
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func init() {
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connhelper.Register("kube-pod", Helper)
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}
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// Helper returns helper for connecting to a Kubernetes pod.
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// Requires BuildKit v0.5.0 or later in the pod.
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func Helper(u *url.URL) (*connhelper.ConnectionHelper, error) {
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sp, err := SpecFromURL(u)
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if err != nil {
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return nil, err
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}
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return &connhelper.ConnectionHelper{
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ContextDialer: func(ctx context.Context, addr string) (net.Conn, error) {
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// using background context because context remains active for the duration of the process, after dial has completed
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return commandconn.New(context.Background(), "kubectl", "--context="+sp.Context, "--namespace="+sp.Namespace,
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"exec", "--container="+sp.Container, "-i", sp.Pod, "--", "buildctl", "dial-stdio")
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},
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}, nil
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}
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// Spec
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type Spec struct {
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Context string
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Namespace string
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Pod string
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Container string
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}
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// SpecFromURL creates Spec from URL.
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// URL is like kube-pod://<pod>?context=<context>&namespace=<namespace>&container=<container> .
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// Only <pod> part is mandatory.
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func SpecFromURL(u *url.URL) (*Spec, error) {
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q := u.Query()
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sp := Spec{
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Context: q.Get("context"),
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Namespace: q.Get("namespace"),
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Pod: u.Hostname(),
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Container: q.Get("container"),
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}
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if sp.Namespace != "" && !validKubeIdentifier(sp.Namespace) {
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return nil, errors.Errorf("unsupported namespace name: %q", sp.Namespace)
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}
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if sp.Pod == "" {
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return nil, errors.New("url lacks pod name")
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}
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if !validKubeIdentifier(sp.Pod) {
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return nil, errors.Errorf("unsupported pod name: %q", sp.Pod)
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}
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if sp.Container != "" && !validKubeIdentifier(sp.Container) {
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return nil, errors.Errorf("unsupported container name: %q", sp.Container)
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}
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return &sp, nil
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}
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var kubeIdentifierRegexp = regexp.MustCompile(`^[-a-z0-9.]+$`)
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// validKubeIdentifier: https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#names
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// The length is not checked because future version of Kube may support longer identifiers.
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func validKubeIdentifier(s string) bool {
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return kubeIdentifierRegexp.MatchString(s)
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}
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