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// Copyright 2020 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
package executor
import (
"bytes"
"context"
"fmt"
"os/exec"
"os/user"
"path/filepath"
"strings"
"time"
"github.com/fatih/color"
"github.com/pingcap/tiup/pkg/cluster/ctxt"
"github.com/pingcap/tiup/pkg/tui"
"github.com/pingcap/tiup/pkg/utils"
"go.uber.org/zap"
)
// Local execute the command at local host.
type Local struct {
Config *SSHConfig
Sudo bool // all commands run with this executor will be using sudo
Locale string // the locale used when executing the command
}
var _ ctxt.Executor = &Local{}
// Execute implements Executor interface.
func (l *Local) Execute(ctx context.Context, cmd string, sudo bool, timeout ...time.Duration) ([]byte, []byte, error) {
// change wd to default home
cmd = fmt.Sprintf("cd; %s", cmd)
// get current user name
user, err := user.Current()
if err != nil {
return nil, nil, err
}
// try to acquire root permission
if l.Sudo || sudo {
cmd = fmt.Sprintf("/usr/bin/sudo -H -u root bash -c \"%s\"", strings.ReplaceAll(cmd, "\"", "\\\""))
} else if l.Config.User != user.Name {
cmd = fmt.Sprintf("/usr/bin/sudo -H -u %s bash -c \"%s\"", l.Config.User, strings.ReplaceAll(cmd, "\"", "\\\""))
}
// set a basic PATH in case it's empty on login
cmd = fmt.Sprintf("PATH=$PATH:/bin:/sbin:/usr/bin:/usr/sbin %s", cmd)
if l.Locale != "" {
cmd = fmt.Sprintf("export LANG=%s; %s", l.Locale, cmd)
}
// run command on remote host
if len(timeout) == 0 {
timeout = append(timeout, executeDefaultTimeout)
}
if len(timeout) > 0 {
var cancel context.CancelFunc
ctx, cancel = context.WithTimeout(ctx, timeout[0])
defer cancel()
}
command := exec.CommandContext(ctx, "/bin/bash", "-c", cmd)
stdout := new(bytes.Buffer)
stderr := new(bytes.Buffer)
command.Stdout = stdout
command.Stderr = stderr
err = command.Run()
zap.L().Info("LocalCommand",
zap.String("cmd", cmd),
zap.Error(err),
zap.String("stdout", stdout.String()),
zap.String("stderr", stderr.String()))
if err != nil {
baseErr := ErrSSHExecuteFailed.
Wrap(err, "Failed to execute command locally").
WithProperty(ErrPropSSHCommand, cmd).
WithProperty(ErrPropSSHStdout, stdout).
WithProperty(ErrPropSSHStderr, stderr)
if len(stdout.Bytes()) > 0 || len(stderr.Bytes()) > 0 {
output := strings.TrimSpace(strings.Join([]string{stdout.String(), stderr.String()}, "\n"))
baseErr = baseErr.
WithProperty(tui.SuggestionFromFormat("Command output:\n%s\n", color.YellowString(output)))
}
return stdout.Bytes(), stderr.Bytes(), baseErr
}
return stdout.Bytes(), stderr.Bytes(), err
}
// Transfer implements Executer interface.
func (l *Local) Transfer(ctx context.Context, src, dst string, download bool, limit int, _ bool) error {
targetPath := filepath.Dir(dst)
if err := utils.MkdirAll(targetPath, 0755); err != nil {
return err
}
cmd := ""
user, err := user.Current()
if err != nil {
return err
}
if download || user.Username == l.Config.User {
cmd = fmt.Sprintf("cp %s %s", src, dst)
} else {
cmd = fmt.Sprintf("/usr/bin/sudo -H -u root bash -c \"cp %[1]s %[2]s && chown %[3]s:$(id -g -n %[3]s) %[2]s\"", src, dst, l.Config.User)
}
command := exec.Command("/bin/bash", "-c", cmd)
stdout := new(bytes.Buffer)
stderr := new(bytes.Buffer)
command.Stdout = stdout
command.Stderr = stderr
err = command.Run()
zap.L().Info("CPCommand",
zap.String("cmd", cmd),
zap.Error(err),
zap.String("stdout", stdout.String()),
zap.String("stderr", stderr.String()))
if err != nil {
baseErr := ErrSSHExecuteFailed.
Wrap(err, "Failed to transfer file over local cp").
WithProperty(ErrPropSSHCommand, cmd).
WithProperty(ErrPropSSHStdout, stdout).
WithProperty(ErrPropSSHStderr, stderr)
if len(stdout.Bytes()) > 0 || len(stderr.Bytes()) > 0 {
output := strings.TrimSpace(strings.Join([]string{stdout.String(), stderr.String()}, "\n"))
baseErr = baseErr.
WithProperty(tui.SuggestionFromFormat("Command output:\n%s\n", color.YellowString(output)))
}
return baseErr
}
return err
}
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