mirror of https://github.com/docker/cli.git
71 lines
1.5 KiB
Go
71 lines
1.5 KiB
Go
// Package ssh provides the connection helper for ssh:// URL.
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// Requires Docker 18.09 or later on the remote host.
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package ssh
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import (
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"net/url"
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"github.com/pkg/errors"
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)
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// New returns cmd and its args
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func New(daemonURL string) (string, []string, error) {
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sp, err := parseSSHURL(daemonURL)
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if err != nil {
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return "", nil, err
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}
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return "ssh", append(sp.Args(), []string{"--", "docker", "system", "dial-stdio"}...), nil
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}
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func parseSSHURL(daemonURL string) (*sshSpec, 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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if u.Scheme != "ssh" {
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return nil, errors.Errorf("expected scheme ssh, got %s", u.Scheme)
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}
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var sp sshSpec
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if u.User != nil {
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sp.user = u.User.Username()
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if _, ok := u.User.Password(); ok {
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return nil, errors.New("ssh helper does not accept plain-text password")
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}
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}
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sp.host = u.Hostname()
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if sp.host == "" {
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return nil, errors.Errorf("host is not specified")
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}
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sp.port = u.Port()
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if u.Path != "" {
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return nil, errors.Errorf("extra path: %s", u.Path)
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}
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if u.RawQuery != "" {
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return nil, errors.Errorf("extra query: %s", u.RawQuery)
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}
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if u.Fragment != "" {
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return nil, errors.Errorf("extra fragment: %s", u.Fragment)
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}
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return &sp, err
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}
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type sshSpec struct {
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user string
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host string
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port string
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}
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func (sp *sshSpec) Args() []string {
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var args []string
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if sp.user != "" {
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args = append(args, "-l", sp.user)
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}
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if sp.port != "" {
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args = append(args, "-p", sp.port)
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}
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args = append(args, sp.host)
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return args
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}
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