143 lines
3.8 KiB
Go
143 lines
3.8 KiB
Go
/*
|
|
Copyright The containerd Authors.
|
|
|
|
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,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
package shim
|
|
|
|
import (
|
|
"context"
|
|
"fmt"
|
|
"net"
|
|
"os"
|
|
"os/exec"
|
|
"path/filepath"
|
|
"strings"
|
|
"sync"
|
|
"time"
|
|
|
|
"github.com/containerd/containerd/namespaces"
|
|
"github.com/pkg/errors"
|
|
)
|
|
|
|
const shimBinaryFormat = "containerd-shim-%s-%s"
|
|
|
|
var runtimePaths sync.Map
|
|
|
|
// Command returns the shim command with the provided args and configuration
|
|
func Command(ctx context.Context, runtime, containerdAddress, path string, cmdArgs ...string) (*exec.Cmd, error) {
|
|
ns, err := namespaces.NamespaceRequired(ctx)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
self, err := os.Executable()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
args := []string{
|
|
"-namespace", ns,
|
|
"-address", containerdAddress,
|
|
"-publish-binary", self,
|
|
}
|
|
args = append(args, cmdArgs...)
|
|
name := BinaryName(runtime)
|
|
if name == "" {
|
|
return nil, fmt.Errorf("invalid runtime name %s, correct runtime name should format like io.containerd.runc.v1", runtime)
|
|
}
|
|
|
|
var cmdPath string
|
|
cmdPathI, cmdPathFound := runtimePaths.Load(name)
|
|
if cmdPathFound {
|
|
cmdPath = cmdPathI.(string)
|
|
} else {
|
|
var lerr error
|
|
if cmdPath, lerr = exec.LookPath(name); lerr != nil {
|
|
if eerr, ok := lerr.(*exec.Error); ok {
|
|
if eerr.Err == exec.ErrNotFound {
|
|
return nil, errors.Wrapf(os.ErrNotExist, "runtime %q binary not installed %q", runtime, name)
|
|
}
|
|
}
|
|
}
|
|
cmdPath, err = filepath.Abs(cmdPath)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if cmdPathI, cmdPathFound = runtimePaths.LoadOrStore(name, cmdPath); cmdPathFound {
|
|
// We didn't store cmdPath we loaded an already cached value. Use it.
|
|
cmdPath = cmdPathI.(string)
|
|
}
|
|
}
|
|
|
|
cmd := exec.Command(cmdPath, args...)
|
|
cmd.Dir = path
|
|
cmd.Env = append(os.Environ(), "GOMAXPROCS=2")
|
|
cmd.SysProcAttr = getSysProcAttr()
|
|
return cmd, nil
|
|
}
|
|
|
|
// BinaryName returns the shim binary name from the runtime name,
|
|
// empty string returns means runtime name is invalid
|
|
func BinaryName(runtime string) string {
|
|
// runtime name should format like $prefix.name.version
|
|
parts := strings.Split(runtime, ".")
|
|
if len(parts) < 2 {
|
|
return ""
|
|
}
|
|
|
|
return fmt.Sprintf(shimBinaryFormat, parts[len(parts)-2], parts[len(parts)-1])
|
|
}
|
|
|
|
// Connect to the provided address
|
|
func Connect(address string, d func(string, time.Duration) (net.Conn, error)) (net.Conn, error) {
|
|
return d(address, 100*time.Second)
|
|
}
|
|
|
|
// WritePidFile writes a pid file atomically
|
|
func WritePidFile(path string, pid int) error {
|
|
path, err := filepath.Abs(path)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
tempPath := filepath.Join(filepath.Dir(path), fmt.Sprintf(".%s", filepath.Base(path)))
|
|
f, err := os.OpenFile(tempPath, os.O_RDWR|os.O_CREATE|os.O_EXCL|os.O_SYNC, 0666)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
_, err = fmt.Fprintf(f, "%d", pid)
|
|
f.Close()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return os.Rename(tempPath, path)
|
|
}
|
|
|
|
// WriteAddress writes a address file atomically
|
|
func WriteAddress(path, address string) error {
|
|
path, err := filepath.Abs(path)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
tempPath := filepath.Join(filepath.Dir(path), fmt.Sprintf(".%s", filepath.Base(path)))
|
|
f, err := os.OpenFile(tempPath, os.O_RDWR|os.O_CREATE|os.O_EXCL|os.O_SYNC, 0666)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
_, err = f.WriteString(address)
|
|
f.Close()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return os.Rename(tempPath, path)
|
|
}
|