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package control
import (
"bytes"
"context"
"fmt"
"os"
"os/exec"
"path/filepath"
"strconv"
"strings"
)
type SSHRunner struct{}
type SSHExecutor interface {
Run(ctx context.Context, node Node, script string) (*CommandResult, error)
Check(ctx context.Context, node Node) (*CommandResult, error)
CopyFile(ctx context.Context, node Node, localPath, remotePath string) error
}
type CommandResult struct {
Stdout string
Stderr string
}
func (r SSHRunner) Run(ctx context.Context, node Node, script string) (*CommandResult, error) {
target := sshTarget(node)
cmd, err := sshCommand(ctx, node, target, "sh -s")
if err != nil {
return &CommandResult{}, err
}
cmd.Stdin = strings.NewReader(script)
var stdout bytes.Buffer
var stderr bytes.Buffer
cmd.Stdout = &stdout
cmd.Stderr = &stderr
if err := cmd.Run(); err != nil {
return &CommandResult{Stdout: stdout.String(), Stderr: stderr.String()}, fmt.Errorf("ssh %s: %w", target, err)
}
return &CommandResult{Stdout: stdout.String(), Stderr: stderr.String()}, nil
}
func (r SSHRunner) Check(ctx context.Context, node Node) (*CommandResult, error) {
target := sshTarget(node)
cmd, err := sshCommand(ctx, node, target, "printf ok")
if err != nil {
return &CommandResult{}, err
}
var stdout bytes.Buffer
var stderr bytes.Buffer
cmd.Stdout = &stdout
cmd.Stderr = &stderr
if err := cmd.Run(); err != nil {
return &CommandResult{Stdout: stdout.String(), Stderr: stderr.String()}, fmt.Errorf("ssh %s: %w", target, err)
}
return &CommandResult{Stdout: stdout.String(), Stderr: stderr.String()}, nil
}
func CopyFileOverSCP(ctx context.Context, node Node, localPath, remotePath string) error {
target := fmt.Sprintf("%s:%s", sshTarget(node), remotePath)
cmd, err := scpCommand(ctx, node, localPath, target)
if err != nil {
return err
}
output, err := cmd.CombinedOutput()
if err != nil {
return fmt.Errorf("scp %s -> %s: %w: %s", localPath, target, err, string(output))
}
return nil
}
func (r SSHRunner) CopyFile(ctx context.Context, node Node, localPath, remotePath string) error {
return CopyFileOverSCP(ctx, node, localPath, remotePath)
}
func CopyDirContentsOverSCP(ctx context.Context, node Node, localDir, remoteDir string) error {
target := fmt.Sprintf("%s:%s", sshTarget(node), remoteDir)
cmd, err := scpCommand(ctx, node, "-r", filepath.Clean(localDir)+"/.", target)
if err != nil {
return err
}
output, err := cmd.CombinedOutput()
if err != nil {
return fmt.Errorf("scp %s -> %s: %w: %s", localDir, target, err, string(output))
}
return nil
}
func sshBaseArgs(node Node) []string {
args := []string{
"-o", "StrictHostKeyChecking=accept-new",
"-p", strconv.Itoa(defaultSSHPort(node.SSH.Port)),
}
if strings.TrimSpace(node.SSH.Auth) == "password" {
args = append(args, "-o", "BatchMode=no")
} else {
args = append(args, "-o", "BatchMode=yes")
}
if strings.TrimSpace(node.SSH.IdentityFile) != "" {
args = append(args, "-i", expandHome(node.SSH.IdentityFile))
}
return args
}
func scpBaseArgs(node Node) []string {
args := []string{
"-o", "StrictHostKeyChecking=accept-new",
"-P", strconv.Itoa(defaultSSHPort(node.SSH.Port)),
}
if strings.TrimSpace(node.SSH.Auth) == "password" {
args = append(args, "-o", "BatchMode=no")
} else {
args = append(args, "-o", "BatchMode=yes")
}
if strings.TrimSpace(node.SSH.IdentityFile) != "" {
args = append(args, "-i", expandHome(node.SSH.IdentityFile))
}
return args
}
func sshTarget(node Node) string {
return fmt.Sprintf("%s@%s", node.SSH.User, node.Host)
}
func defaultSSHPort(port int) int {
if port == 0 {
return 22
}
return port
}
func expandHome(path string) string {
if path == "" || path[0] != '~' {
return path
}
home, err := exec.Command("sh", "-lc", "printf %s \"$HOME\"").Output()
if err != nil {
return path
}
return filepath.Join(strings.TrimSpace(string(home)), strings.TrimPrefix(path, "~/"))
}
func sshCommand(ctx context.Context, node Node, extraArgs ...string) (*exec.Cmd, error) {
args := sshBaseArgs(node)
args = append(args, extraArgs...)
return wrapWithPassword(ctx, node, "ssh", args...)
}
func scpCommand(ctx context.Context, node Node, extraArgs ...string) (*exec.Cmd, error) {
args := scpBaseArgs(node)
args = append(args, extraArgs...)
return wrapWithPassword(ctx, node, "scp", args...)
}
func wrapWithPassword(ctx context.Context, node Node, command string, args ...string) (*exec.Cmd, error) {
if strings.TrimSpace(node.SSH.Auth) != "password" {
return exec.CommandContext(ctx, command, args...), nil
}
password := node.SSH.Password
if password == "" {
envName := strings.TrimSpace(node.SSH.PasswordEnv)
if envName == "" {
return nil, fmt.Errorf("ssh password auth for %s requires ssh.password_env", sshTarget(node))
}
password = os.Getenv(envName)
if password == "" {
return nil, fmt.Errorf("ssh password env %s is empty", envName)
}
}
wrappedArgs := append([]string{"-p", password, command}, args...)
cmd := exec.CommandContext(ctx, "sshpass", wrappedArgs...)
return cmd, nil
}
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