116 lines
3.2 KiB
Go
116 lines
3.2 KiB
Go
/*
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Copyright The containerd Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package v2
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import (
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"context"
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"fmt"
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"net"
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"os"
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"os/exec"
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"path/filepath"
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"strings"
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"time"
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"github.com/containerd/containerd/namespaces"
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"github.com/pkg/errors"
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)
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const shimBinaryFormat = "containerd-shim-%s-%s"
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func shimCommand(ctx context.Context, runtime, containerdAddress string, bundle *Bundle, cmdArgs ...string) (*exec.Cmd, error) {
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ns, err := namespaces.NamespaceRequired(ctx)
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if err != nil {
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return nil, err
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}
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self, err := os.Executable()
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if err != nil {
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return nil, err
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}
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args := []string{
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"-namespace", ns,
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"-address", containerdAddress,
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"-publish-binary", self,
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}
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args = append(args, cmdArgs...)
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name := getShimBinaryName(runtime)
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if _, err := exec.LookPath(name); err != nil {
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if eerr, ok := err.(*exec.Error); ok {
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if eerr.Err == exec.ErrNotFound {
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return nil, errors.Wrapf(os.ErrNotExist, "runtime %q binary not installed %q", runtime, name)
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}
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}
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}
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cmd := exec.Command(name, args...)
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cmd.Dir = bundle.Path
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cmd.Env = append(os.Environ(), "GOMAXPROCS=2")
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cmd.SysProcAttr = getSysProcAttr()
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return cmd, nil
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}
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func getShimBinaryName(runtime string) string {
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parts := strings.Split(runtime, ".")
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// TODO: add validation for runtime
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return fmt.Sprintf(shimBinaryFormat, parts[len(parts)-2], parts[len(parts)-1])
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}
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func abstractAddress(ctx context.Context, id string) (string, error) {
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ns, err := namespaces.NamespaceRequired(ctx)
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if err != nil {
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return "", err
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}
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return filepath.Join(string(filepath.Separator), "containerd-shim", ns, id, "shim.sock"), nil
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}
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func connect(address string, d func(string, time.Duration) (net.Conn, error)) (net.Conn, error) {
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return d(address, 100*time.Second)
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}
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func annonDialer(address string, timeout time.Duration) (net.Conn, error) {
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address = strings.TrimPrefix(address, "unix://")
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return net.DialTimeout("unix", "\x00"+address, timeout)
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}
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func newSocket(address string) (*net.UnixListener, error) {
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if len(address) > 106 {
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return nil, errors.Errorf("%q: unix socket path too long (> 106)", address)
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}
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l, err := net.Listen("unix", "\x00"+address)
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if err != nil {
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return nil, errors.Wrapf(err, "failed to listen to abstract unix socket %q", address)
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}
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return l.(*net.UnixListener), nil
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}
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func writePidFile(path string, pid int) error {
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path, err := filepath.Abs(path)
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if err != nil {
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return err
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}
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tempPath := filepath.Join(filepath.Dir(path), fmt.Sprintf(".%s", filepath.Base(path)))
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f, err := os.OpenFile(tempPath, os.O_RDWR|os.O_CREATE|os.O_EXCL|os.O_SYNC, 0666)
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if err != nil {
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return err
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}
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_, err = fmt.Fprintf(f, "%d", pid)
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f.Close()
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if err != nil {
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return err
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}
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return os.Rename(tempPath, path)
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}
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