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|
//go:build linux && !remote
// +build linux,!remote
package system
import (
"errors"
"fmt"
"net"
"net/url"
"os"
"path/filepath"
"github.com/containers/common/pkg/cgroups"
"github.com/containers/podman/v4/cmd/podman/registry"
api "github.com/containers/podman/v4/pkg/api/server"
"github.com/containers/podman/v4/pkg/domain/entities"
"github.com/containers/podman/v4/pkg/domain/infra"
"github.com/containers/podman/v4/pkg/servicereaper"
"github.com/containers/podman/v4/utils"
"github.com/coreos/go-systemd/v22/activation"
"github.com/sirupsen/logrus"
"github.com/spf13/pflag"
"golang.org/x/sys/unix"
)
// maybeMoveToSubCgroup moves the current process in a sub cgroup when
// it is running in the root cgroup on a system that uses cgroupv2.
func maybeMoveToSubCgroup() error {
unifiedMode, err := cgroups.IsCgroup2UnifiedMode()
if err != nil {
return err
}
if !unifiedMode {
return nil
}
cgroup, err := utils.GetOwnCgroup()
if err != nil {
return err
}
if cgroup == "/" {
return utils.MoveUnderCgroupSubtree("init")
}
return nil
}
func restService(flags *pflag.FlagSet, cfg *entities.PodmanConfig, opts entities.ServiceOptions) error {
var (
listener net.Listener
err error
)
libpodRuntime, err := infra.GetRuntime(registry.Context(), flags, cfg)
if err != nil {
return err
}
if opts.URI == "" {
if _, found := os.LookupEnv("LISTEN_PID"); !found {
return errors.New("no service URI provided and socket activation protocol is not active")
}
listeners, err := activation.Listeners()
if err != nil {
return fmt.Errorf("cannot retrieve file descriptors from systemd: %w", err)
}
if len(listeners) != 1 {
return fmt.Errorf("wrong number of file descriptors for socket activation protocol (%d != 1)", len(listeners))
}
listener = listeners[0]
// note that activation.Listeners() returns nil when it cannot listen on the fd (i.e. udp connection)
if listener == nil {
return errors.New("unexpected fd received from systemd: cannot listen on it")
}
libpodRuntime.SetRemoteURI(listeners[0].Addr().String())
} else {
uri, err := url.Parse(opts.URI)
if err != nil {
return fmt.Errorf("%s is an invalid socket destination", opts.URI)
}
switch uri.Scheme {
case "unix":
path, err := filepath.Abs(uri.Path)
if err != nil {
return err
}
if os.Getenv("LISTEN_FDS") != "" {
// If it is activated by systemd, use the first LISTEN_FD (3)
// instead of opening the socket file.
f := os.NewFile(uintptr(3), "podman.sock")
listener, err = net.FileListener(f)
if err != nil {
return err
}
} else {
listener, err = net.Listen(uri.Scheme, path)
if err != nil {
return fmt.Errorf("unable to create socket: %w", err)
}
}
case "tcp":
host := uri.Host
if host == "" {
// For backward compatibility, support "tcp:<host>:<port>" and "tcp://<host>:<port>"
host = uri.Opaque
}
listener, err = net.Listen(uri.Scheme, host)
if err != nil {
return fmt.Errorf("unable to create socket %v: %w", host, err)
}
default:
logrus.Debugf("Attempting API Service endpoint scheme %q", uri.Scheme)
}
libpodRuntime.SetRemoteURI(uri.String())
}
// Close stdin, so shortnames will not prompt
devNullfile, err := os.Open(os.DevNull)
if err != nil {
return err
}
defer devNullfile.Close()
if err := unix.Dup2(int(devNullfile.Fd()), int(os.Stdin.Fd())); err != nil {
return err
}
if err := maybeMoveToSubCgroup(); err != nil {
return err
}
servicereaper.Start()
infra.StartWatcher(libpodRuntime)
server, err := api.NewServerWithSettings(libpodRuntime, listener, opts)
if err != nil {
return err
}
defer func() {
if err := server.Shutdown(true); err != nil {
logrus.Warnf("Error when stopping API service: %s", err)
}
}()
err = server.Serve()
if listener != nil {
_ = listener.Close()
}
return err
}
|
