2020-01-21 23:19:40 +00:00
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From 3d99c51e1b38a440804a55c9f314f62cc50b8902 Mon Sep 17 00:00:00 2001
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2019-08-01 15:00:20 +00:00
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From: Giuseppe Scrivano <gscrivan@redhat.com>
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Date: Fri, 25 May 2018 18:04:06 +0200
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Subject: [PATCH] sd-notify: do not hang when NOTIFY_SOCKET is used with create
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if NOTIFY_SOCKET is used, do not block the main runc process waiting
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for events on the notify socket. Bind mount the parent directory of
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the notify socket, so that "start" can create the socket and it is
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still accessible from the container.
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Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
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---
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2020-01-21 23:19:40 +00:00
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notify_socket.go | 112 ++++++++++++++++++++++++++++++++++-------------
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2019-08-01 15:00:20 +00:00
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signals.go | 4 +-
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start.go | 13 +++++-
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utils_linux.go | 12 ++++-
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2020-01-21 23:19:40 +00:00
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4 files changed, 105 insertions(+), 36 deletions(-)
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2019-08-01 15:00:20 +00:00
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diff --git a/notify_socket.go b/notify_socket.go
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2020-01-21 23:19:40 +00:00
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index e7453c62..d961453a 100644
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2019-08-01 15:00:20 +00:00
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--- a/notify_socket.go
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+++ b/notify_socket.go
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2020-01-21 23:19:40 +00:00
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@@ -7,11 +7,13 @@ import (
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2019-08-01 15:00:20 +00:00
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"fmt"
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"net"
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2020-01-21 23:19:40 +00:00
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"os"
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2019-08-01 15:00:20 +00:00
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+ "path"
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"path/filepath"
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+ "strconv"
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+ "time"
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+ "github.com/opencontainers/runc/libcontainer"
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"github.com/opencontainers/runtime-spec/specs-go"
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-
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- "github.com/sirupsen/logrus"
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"github.com/urfave/cli"
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)
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2020-01-21 23:19:40 +00:00
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@@ -27,12 +29,12 @@ func newNotifySocket(context *cli.Context, notifySocketHost string, id string) *
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2019-08-01 15:00:20 +00:00
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}
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root := filepath.Join(context.GlobalString("root"), id)
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- path := filepath.Join(root, "notify.sock")
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+ socketPath := filepath.Join(root, "notify", "notify.sock")
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notifySocket := ¬ifySocket{
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socket: nil,
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host: notifySocketHost,
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- socketPath: path,
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+ socketPath: socketPath,
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}
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return notifySocket
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2020-01-21 23:19:40 +00:00
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@@ -44,13 +46,19 @@ func (s *notifySocket) Close() error {
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2019-08-01 15:00:20 +00:00
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// If systemd is supporting sd_notify protocol, this function will add support
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// for sd_notify protocol from within the container.
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-func (s *notifySocket) setupSpec(context *cli.Context, spec *specs.Spec) {
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- mount := specs.Mount{Destination: s.host, Source: s.socketPath, Options: []string{"bind"}}
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+func (s *notifySocket) setupSpec(context *cli.Context, spec *specs.Spec) error {
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+ pathInContainer := filepath.Join("/run/notify", path.Base(s.socketPath))
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+ mount := specs.Mount{
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+ Destination: path.Dir(pathInContainer),
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+ Source: path.Dir(s.socketPath),
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+ Options: []string{"bind", "nosuid", "noexec", "nodev", "ro"},
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+ }
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spec.Mounts = append(spec.Mounts, mount)
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- spec.Process.Env = append(spec.Process.Env, fmt.Sprintf("NOTIFY_SOCKET=%s", s.host))
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+ spec.Process.Env = append(spec.Process.Env, fmt.Sprintf("NOTIFY_SOCKET=%s", pathInContainer))
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+ return nil
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}
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-func (s *notifySocket) setupSocket() error {
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+func (s *notifySocket) bindSocket() error {
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addr := net.UnixAddr{
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Name: s.socketPath,
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Net: "unixgram",
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2020-01-21 23:19:40 +00:00
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@@ -71,45 +79,89 @@ func (s *notifySocket) setupSocket() error {
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2019-08-01 15:00:20 +00:00
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return nil
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}
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-// pid1 must be set only with -d, as it is used to set the new process as the main process
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-// for the service in systemd
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-func (s *notifySocket) run(pid1 int) {
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- buf := make([]byte, 512)
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- notifySocketHostAddr := net.UnixAddr{Name: s.host, Net: "unixgram"}
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+func (s *notifySocket) setupSocketDirectory() error {
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+ return os.Mkdir(path.Dir(s.socketPath), 0755)
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+}
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+
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+func notifySocketStart(context *cli.Context, notifySocketHost, id string) (*notifySocket, error) {
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+ notifySocket := newNotifySocket(context, notifySocketHost, id)
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+ if notifySocket == nil {
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+ return nil, nil
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+ }
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+
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+ if err := notifySocket.bindSocket(); err != nil {
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+ return nil, err
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+ }
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+ return notifySocket, nil
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+}
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+
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+func (n *notifySocket) waitForContainer(container libcontainer.Container) error {
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+ s, err := container.State()
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+ if err != nil {
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+ return err
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+ }
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+ return n.run(s.InitProcessPid)
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+}
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+
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+func (n *notifySocket) run(pid1 int) error {
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+ if n.socket == nil {
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+ return nil
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+ }
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+ notifySocketHostAddr := net.UnixAddr{Name: n.host, Net: "unixgram"}
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client, err := net.DialUnix("unixgram", nil, ¬ifySocketHostAddr)
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if err != nil {
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- logrus.Error(err)
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- return
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+ return err
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}
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- for {
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- r, err := s.socket.Read(buf)
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- if err != nil {
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- break
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+
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+ ticker := time.NewTicker(time.Millisecond * 100)
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+ defer ticker.Stop()
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+
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+ fileChan := make(chan []byte)
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+ go func() {
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+ for {
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+ buf := make([]byte, 512)
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+ r, err := n.socket.Read(buf)
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+ if err != nil {
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+ return
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+ }
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+ got := buf[0:r]
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+ if !bytes.HasPrefix(got, []byte("READY=")) {
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+ continue
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+ }
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+ fileChan <- got
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+ return
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}
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- var out bytes.Buffer
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- for _, line := range bytes.Split(buf[0:r], []byte{'\n'}) {
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- if bytes.HasPrefix(line, []byte("READY=")) {
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+ }()
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+
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+ for {
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+ select {
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+ case <-ticker.C:
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+ _, err := os.Stat(filepath.Join("/proc", strconv.Itoa(pid1)))
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+ if err != nil {
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+ return nil
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+ }
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+ case b := <-fileChan:
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+ for _, line := range bytes.Split(b, []byte{'\n'}) {
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+ var out bytes.Buffer
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_, err = out.Write(line)
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if err != nil {
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- return
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+ return err
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}
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_, err = out.Write([]byte{'\n'})
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if err != nil {
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- return
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+ return err
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}
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_, err = client.Write(out.Bytes())
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if err != nil {
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- return
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+ return err
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}
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// now we can inform systemd to use pid1 as the pid to monitor
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- if pid1 > 0 {
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- newPid := fmt.Sprintf("MAINPID=%d\n", pid1)
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- client.Write([]byte(newPid))
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- }
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- return
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+ newPid := fmt.Sprintf("MAINPID=%d\n", pid1)
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+ client.Write([]byte(newPid))
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+ return nil
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}
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}
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}
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diff --git a/signals.go b/signals.go
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2020-01-21 23:19:40 +00:00
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index b67f65a0..dd25e094 100644
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2019-08-01 15:00:20 +00:00
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--- a/signals.go
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+++ b/signals.go
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@@ -70,6 +70,7 @@ func (h *signalHandler) forward(process *libcontainer.Process, tty *tty, detach
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h.notifySocket.run(pid1)
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return 0, nil
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}
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+ h.notifySocket.run(os.Getpid())
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go h.notifySocket.run(0)
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}
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@@ -97,9 +98,6 @@ func (h *signalHandler) forward(process *libcontainer.Process, tty *tty, detach
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// status because we must ensure that any of the go specific process
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// fun such as flushing pipes are complete before we return.
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process.Wait()
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- if h.notifySocket != nil {
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- h.notifySocket.Close()
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- }
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return e.status, nil
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}
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}
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diff --git a/start.go b/start.go
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2020-01-21 23:19:40 +00:00
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index 2bb698b2..3a1769a4 100644
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2019-08-01 15:00:20 +00:00
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--- a/start.go
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+++ b/start.go
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@@ -3,6 +3,7 @@ package main
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import (
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"errors"
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"fmt"
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+ "os"
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"github.com/opencontainers/runc/libcontainer"
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"github.com/urfave/cli"
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@@ -31,7 +32,17 @@ your host.`,
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}
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switch status {
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case libcontainer.Created:
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- return container.Exec()
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+ notifySocket, err := notifySocketStart(context, os.Getenv("NOTIFY_SOCKET"), container.ID())
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+ if err != nil {
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+ return err
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+ }
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+ if err := container.Exec(); err != nil {
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+ return err
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+ }
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+ if notifySocket != nil {
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+ return notifySocket.waitForContainer(container)
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+ }
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+ return nil
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case libcontainer.Stopped:
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return errors.New("cannot start a container that has stopped")
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case libcontainer.Running:
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diff --git a/utils_linux.go b/utils_linux.go
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2020-01-21 23:19:40 +00:00
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index 984e6b0f..46c26246 100644
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2019-08-01 15:00:20 +00:00
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--- a/utils_linux.go
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+++ b/utils_linux.go
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2020-01-21 23:19:40 +00:00
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@@ -408,7 +408,9 @@ func startContainer(context *cli.Context, spec *specs.Spec, action CtAct, criuOp
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2019-08-01 15:00:20 +00:00
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notifySocket := newNotifySocket(context, os.Getenv("NOTIFY_SOCKET"), id)
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if notifySocket != nil {
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- notifySocket.setupSpec(context, spec)
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+ if err := notifySocket.setupSpec(context, spec); err != nil {
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+ return -1, err
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+ }
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}
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container, err := createContainer(context, id, spec)
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2020-01-21 23:19:40 +00:00
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@@ -417,10 +419,16 @@ func startContainer(context *cli.Context, spec *specs.Spec, action CtAct, criuOp
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2019-08-01 15:00:20 +00:00
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}
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if notifySocket != nil {
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- err := notifySocket.setupSocket()
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+ err := notifySocket.setupSocketDirectory()
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if err != nil {
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return -1, err
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}
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+ if action == CT_ACT_RUN {
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+ err := notifySocket.bindSocket()
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+ if err != nil {
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+ return -1, err
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+ }
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+ }
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}
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// Support on-demand socket activation by passing file descriptors into the container init process.
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2020-01-21 23:19:40 +00:00
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--
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2.21.0
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