153 lines
3.1 KiB
Go
153 lines
3.1 KiB
Go
package main
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import (
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"context"
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"fmt"
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"io"
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"net"
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"os"
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"path/filepath"
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"sync"
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"time"
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"golang.org/x/crypto/ssh"
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"golang.org/x/crypto/ssh/agent"
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"golang.org/x/crypto/ssh/knownhosts"
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)
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type sshClient struct {
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agentConn net.Conn
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client *ssh.Client
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ctx context.Context
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getenv func(string) string
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stdout io.Writer
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stderr io.Writer
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}
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func (env *Env) newSSHClient(destination string) (*sshClient, error) {
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sshc := sshClient{
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agentConn: nil,
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client: nil,
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ctx: env.ctx,
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getenv: env.getenv,
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stdout: env.stdout,
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stderr: env.stderr,
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}
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var err error
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socket := sshc.getenv("SSH_AUTH_SOCK")
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if sshc.agentConn, err = net.Dial("unix", socket); err != nil {
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return nil, fmt.Errorf("failed to open SSH_AUTH_SOCK: %w", err)
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}
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agentClient := agent.NewClient(sshc.agentConn)
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hostKeyCallback, err := knownhosts.New(filepath.Join(sshc.getenv("HOME"), ".ssh/known_hosts"))
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if err != nil {
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return nil, fmt.Errorf("failed to create hostkeycallback function: %w", err)
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}
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config := &ssh.ClientConfig{
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User: "root",
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Auth: []ssh.AuthMethod{
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ssh.PublicKeysCallback(agentClient.Signers),
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},
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HostKeyCallback: hostKeyCallback,
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}
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sshc.client, err = ssh.Dial("tcp", destination, config)
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if err != nil {
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return nil, fmt.Errorf("failed to dial: %w", err)
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}
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return &sshc, nil
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}
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func (sshc *sshClient) Close() error {
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if err := sshc.client.Close(); err != nil {
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return err
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}
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if err := sshc.agentConn.Close(); err != nil {
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return err
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}
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return nil
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}
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func (sshc *sshClient) SendFile(filename string) error {
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session, err := sshc.client.NewSession()
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if err != nil {
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return fmt.Errorf("failed to create ssh client session: %w", err)
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}
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defer session.Close()
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file, err := os.Open(filename)
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if err != nil {
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return fmt.Errorf("failed to open file: %w", err)
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}
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defer file.Close()
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fi, err := file.Stat()
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if err != nil {
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return fmt.Errorf("failed to stat file: %w", err)
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}
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w, err := session.StdinPipe()
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if err != nil {
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return fmt.Errorf("sshClient failed to open session stdin pipe: %w", err)
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}
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wg := sync.WaitGroup{}
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wg.Add(2)
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errCh := make(chan error, 2)
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session.Stdout = sshc.stdout
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session.Stderr = sshc.stderr
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if err := session.Start("scp -t /usr/local/bin/gonf-run"); err != nil {
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return fmt.Errorf("failed to run scp: %w", err)
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}
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go func() {
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defer wg.Done()
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if e := session.Wait(); e != nil {
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errCh <- e
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}
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}()
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go func() {
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defer wg.Done()
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defer w.Close()
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// Write "C{mode} {size} {filename}\n"
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if _, e := fmt.Fprintf(w, "C%#o %d %s\n", 0700, fi.Size(), "gonf-run"); e != nil {
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errCh <- e
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return
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}
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// Write the file's contents.
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if _, e := io.Copy(w, file); e != nil {
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errCh <- e
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return
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}
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// End with a null byte.
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if _, e := fmt.Fprint(w, "\x00"); e != nil {
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errCh <- e
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}
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}()
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ctx, cancel := context.WithTimeout(sshc.ctx, 60*time.Second)
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defer cancel()
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// wait for all waitgroup.Done() or the timeout
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c := make(chan struct{})
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go func() {
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wg.Wait()
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close(c)
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}()
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select {
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case <-c:
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case <-ctx.Done():
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return ctx.Err()
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}
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close(errCh)
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for err := range errCh {
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if err != nil {
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return err
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}
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}
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return nil
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}
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