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38 lines
1.2 KiB
Go
38 lines
1.2 KiB
Go
// Package connhelper provides helpers for connecting to a remote daemon host with custom logic.
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package connhelper
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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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)
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// ConnectionHelper allows to connect to a remote host with custom stream provider binary.
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type ConnectionHelper struct {
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// ContextDialer can be passed to grpc.WithContextDialer
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ContextDialer func(ctx context.Context, addr string) (net.Conn, error)
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}
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// GetConnectionHelper returns BuildKit-specific connection helper for the given URL.
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// GetConnectionHelper returns nil without error when no helper is registered for the scheme.
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//
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// docker://<container> URL requires BuildKit v0.5.0 or later in the container.
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func GetConnectionHelper(daemonURL string) (*ConnectionHelper, error) {
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u, err := url.Parse(daemonURL)
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if err != nil {
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return nil, err
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}
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switch scheme := u.Scheme; scheme {
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case "docker":
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container := u.Host
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return &ConnectionHelper{
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ContextDialer: func(ctx context.Context, addr string) (net.Conn, error) {
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return commandconn.New(ctx, "docker", "exec", "-i", container, "buildctl", "dial-stdio")
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},
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}, nil
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}
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return nil, err
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}
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