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57 lines
1.5 KiB
Go
57 lines
1.5 KiB
Go
// Package dockercontainer provides connhelper for docker-container://<container>
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package dockercontainer
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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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"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("docker-container", Helper)
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}
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// Helper returns helper for connecting to a Docker container.
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// Requires BuildKit v0.5.0 or later in the container.
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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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ctxFlags := []string{}
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if sp.Context != "" {
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ctxFlags = append(ctxFlags, "--context="+sp.Context)
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}
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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(), "docker", append(ctxFlags, []string{"exec", "-i", sp.Container, "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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Container string
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}
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// SpecFromURL creates Spec from URL.
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// URL is like docker-container://<container>?context=<context>
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// Only <container> 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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Container: u.Hostname(),
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}
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if sp.Container == "" {
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return nil, errors.New("url lacks container name")
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}
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return &sp, nil
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}
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