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fix: Improve shutdown procedure of ssh, portforward, wgtunnel cmds #3354

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Merged
merged 3 commits into from
Aug 2, 2022
Merged

fix: Improve shutdown procedure of ssh, portforward, wgtunnel cmds #3354

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ca14871
fix: Improve shutdown procedure of ssh, portforward, wgtunnel cmds
mafredri Aug 2, 2022
ee384a2
fix: Set ssh session stderr to stderr
mafredri Aug 2, 2022
e483eef
Set stderr in ssh test to pty output
mafredri Aug 2, 2022
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19 changes: 12 additions & 7 deletions cli/portforward.go
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -55,6 +55,9 @@ func portForward() *cobra.Command {
},
),
RunE: func(cmd *cobra.Command, args []string) error {
ctx, cancel := context.WithCancel(cmd.Context())
defer cancel()

specs, err := parsePortForwards(tcpForwards, udpForwards, unixForwards)
if err != nil {
return xerrors.Errorf("parse port-forward specs: %w", err)
Expand All @@ -72,21 +75,21 @@ func portForward() *cobra.Command {
return err
}

workspace, agent, err := getWorkspaceAndAgent(cmd, client, codersdk.Me, args[0], false)
workspace, agent, err := getWorkspaceAndAgent(ctx, cmd, client, codersdk.Me, args[0], false)
if err != nil {
return err
}
if workspace.LatestBuild.Transition != codersdk.WorkspaceTransitionStart {
return xerrors.New("workspace must be in start transition to port-forward")
}
if workspace.LatestBuild.Job.CompletedAt == nil {
err = cliui.WorkspaceBuild(cmd.Context(), cmd.ErrOrStderr(), client, workspace.LatestBuild.ID, workspace.CreatedAt)
err = cliui.WorkspaceBuild(ctx, cmd.ErrOrStderr(), client, workspace.LatestBuild.ID, workspace.CreatedAt)
if err != nil {
return err
}
}

err = cliui.Agent(cmd.Context(), cmd.ErrOrStderr(), cliui.AgentOptions{
err = cliui.Agent(ctx, cmd.ErrOrStderr(), cliui.AgentOptions{
WorkspaceName: workspace.Name,
Fetch: func(ctx context.Context) (codersdk.WorkspaceAgent, error) {
return client.WorkspaceAgent(ctx, agent.ID)
Expand All @@ -96,15 +99,14 @@ func portForward() *cobra.Command {
return xerrors.Errorf("await agent: %w", err)
}

conn, err := client.DialWorkspaceAgent(cmd.Context(), agent.ID, nil)
conn, err := client.DialWorkspaceAgent(ctx, agent.ID, nil)
if err != nil {
return xerrors.Errorf("dial workspace agent: %w", err)
}
defer conn.Close()

// Start all listeners.
var (
ctx, cancel = context.WithCancel(cmd.Context())
wg = new(sync.WaitGroup)
listeners = make([]net.Listener, len(specs))
closeAllListeners = func() {
Expand All @@ -116,11 +118,11 @@ func portForward() *cobra.Command {
}
}
)
defer cancel()
defer closeAllListeners()

for i, spec := range specs {
l, err := listenAndPortForward(ctx, cmd, conn, wg, spec)
if err != nil {
closeAllListeners()
return err
}
listeners[i] = l
Expand All @@ -129,7 +131,10 @@ func portForward() *cobra.Command {
// Wait for the context to be canceled or for a signal and close
// all listeners.
var closeErr error
wg.Add(1)
go func() {
defer wg.Done()

sigs := make(chan os.Signal, 1)
signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)

Expand Down
82 changes: 48 additions & 34 deletions cli/ssh.go
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -51,6 +51,9 @@ func ssh() *cobra.Command {
Short: "SSH into a workspace",
Args: cobra.ArbitraryArgs,
RunE: func(cmd *cobra.Command, args []string) error {
ctx, cancel := context.WithCancel(cmd.Context())
defer cancel()

client, err := createClient(cmd)
if err != nil {
return err
Expand All @@ -68,14 +71,14 @@ func ssh() *cobra.Command {
}
}

workspace, workspaceAgent, err := getWorkspaceAndAgent(cmd, client, codersdk.Me, args[0], shuffle)
workspace, workspaceAgent, err := getWorkspaceAndAgent(ctx, cmd, client, codersdk.Me, args[0], shuffle)
if err != nil {
return err
}

// OpenSSH passes stderr directly to the calling TTY.
// This is required in "stdio" mode so a connecting indicator can be displayed.
err = cliui.Agent(cmd.Context(), cmd.ErrOrStderr(), cliui.AgentOptions{
err = cliui.Agent(ctx, cmd.ErrOrStderr(), cliui.AgentOptions{
WorkspaceName: workspace.Name,
Fetch: func(ctx context.Context) (codersdk.WorkspaceAgent, error) {
return client.WorkspaceAgent(ctx, workspaceAgent.ID)
Expand All @@ -85,42 +88,33 @@ func ssh() *cobra.Command {
return xerrors.Errorf("await agent: %w", err)
}

var (
sshClient *gossh.Client
sshSession *gossh.Session
)
var newSSHClient func() (*gossh.Client, error)

if !wireguard {
conn, err := client.DialWorkspaceAgent(cmd.Context(), workspaceAgent.ID, nil)
conn, err := client.DialWorkspaceAgent(ctx, workspaceAgent.ID, nil)
if err != nil {
return err
}
defer conn.Close()

stopPolling := tryPollWorkspaceAutostop(cmd.Context(), client, workspace)
stopPolling := tryPollWorkspaceAutostop(ctx, client, workspace)
defer stopPolling()

if stdio {
rawSSH, err := conn.SSH()
if err != nil {
return err
}
defer rawSSH.Close()

go func() {
_, _ = io.Copy(cmd.OutOrStdout(), rawSSH)
}()
_, _ = io.Copy(rawSSH, cmd.InOrStdin())
return nil
}

sshClient, err = conn.SSHClient()
if err != nil {
return err
}

sshSession, err = sshClient.NewSession()
if err != nil {
return err
}
newSSHClient = conn.SSHClient
} else {
// TODO: more granual control of Tailscale logging.
peerwg.Logf = tslogger.Discard
Expand All @@ -133,8 +127,9 @@ func ssh() *cobra.Command {
if err != nil {
return xerrors.Errorf("create wireguard network: %w", err)
}
defer wgn.Close()

err = client.PostWireguardPeer(cmd.Context(), workspace.ID, peerwg.Handshake{
err = client.PostWireguardPeer(ctx, workspace.ID, peerwg.Handshake{
Recipient: workspaceAgent.ID,
NodePublicKey: wgn.NodePrivateKey.Public(),
DiscoPublicKey: wgn.DiscoPublicKey,
Expand All @@ -155,10 +150,11 @@ func ssh() *cobra.Command {
}

if stdio {
rawSSH, err := wgn.SSH(cmd.Context(), workspaceAgent.IPv6.IP())
rawSSH, err := wgn.SSH(ctx, workspaceAgent.IPv6.IP())
if err != nil {
return err
}
defer rawSSH.Close()

go func() {
_, _ = io.Copy(cmd.OutOrStdout(), rawSSH)
Expand All @@ -167,16 +163,29 @@ func ssh() *cobra.Command {
return nil
}

sshClient, err = wgn.SSHClient(cmd.Context(), workspaceAgent.IPv6.IP())
if err != nil {
return err
newSSHClient = func() (*gossh.Client, error) {
return wgn.SSHClient(ctx, workspaceAgent.IPv6.IP())
}
}

sshSession, err = sshClient.NewSession()
if err != nil {
return err
}
sshClient, err := newSSHClient()
if err != nil {
return err
}
defer sshClient.Close()

sshSession, err := sshClient.NewSession()
if err != nil {
return err
}
defer sshSession.Close()

// Ensure context cancellation is propagated to the
// SSH session, e.g. to cancel `Wait()` at the end.
go func() {
<-ctx.Done()
_ = sshSession.Close()
}()

if identityAgent == "" {
identityAgent = os.Getenv("SSH_AUTH_SOCK")
Expand All @@ -203,15 +212,18 @@ func ssh() *cobra.Command {
_ = term.Restore(int(stdinFile.Fd()), state)
}()

windowChange := listenWindowSize(cmd.Context())
windowChange := listenWindowSize(ctx)
go func() {
for {
select {
case <-cmd.Context().Done():
case <-ctx.Done():
return
case <-windowChange:
}
width, height, _ := term.GetSize(int(stdoutFile.Fd()))
width, height, err := term.GetSize(int(stdoutFile.Fd()))
if err != nil {
continue
}
_ = sshSession.WindowChange(height, width)
}
}()
Expand All @@ -224,13 +236,17 @@ func ssh() *cobra.Command {

sshSession.Stdin = cmd.InOrStdin()
sshSession.Stdout = cmd.OutOrStdout()
sshSession.Stderr = cmd.OutOrStdout()
sshSession.Stderr = cmd.ErrOrStderr()
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This is a drive-by change I did. It seemed wrong but perhaps I didn't understand the purpose?

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Seems reasonable to me!


err = sshSession.Shell()
if err != nil {
return err
}

// Put cancel at the top of the defer stack to initiate
// shutdown of services.
defer cancel()

err = sshSession.Wait()
if err != nil {
// If the connection drops unexpectedly, we get an ExitMissingError but no other
Expand Down Expand Up @@ -259,16 +275,14 @@ func ssh() *cobra.Command {
// getWorkspaceAgent returns the workspace and agent selected using either the
// `<workspace>[.<agent>]` syntax via `in` or picks a random workspace and agent
// if `shuffle` is true.
func getWorkspaceAndAgent(cmd *cobra.Command, client *codersdk.Client, userID string, in string, shuffle bool) (codersdk.Workspace, codersdk.WorkspaceAgent, error) { //nolint:revive
ctx := cmd.Context()

func getWorkspaceAndAgent(ctx context.Context, cmd *cobra.Command, client *codersdk.Client, userID string, in string, shuffle bool) (codersdk.Workspace, codersdk.WorkspaceAgent, error) { //nolint:revive
var (
workspace codersdk.Workspace
workspaceParts = strings.Split(in, ".")
err error
)
if shuffle {
workspaces, err := client.Workspaces(cmd.Context(), codersdk.WorkspaceFilter{
workspaces, err := client.Workspaces(ctx, codersdk.WorkspaceFilter{
Owner: codersdk.Me,
})
if err != nil {
Expand Down
5 changes: 1 addition & 4 deletions cli/ssh_test.go
View file
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Original file line number Diff line number Diff line change
Expand Up @@ -229,7 +229,7 @@ func TestSSH(t *testing.T) {
pty := ptytest.New(t)
cmd.SetIn(pty.Input())
cmd.SetOut(pty.Output())
cmd.SetErr(io.Discard)
cmd.SetErr(pty.Output())
cmdDone := tGo(t, func() {
err := cmd.ExecuteContext(ctx)
assert.NoError(t, err)
Expand All @@ -248,9 +248,6 @@ func TestSSH(t *testing.T) {

// And we're done.
pty.WriteLine("exit")
// Read output to prevent hang on macOS, see:
// https://github.com/coder/coder/issues/2122
pty.ExpectMatch("exit")
<-cmdDone
})
}
Expand Down
20 changes: 13 additions & 7 deletions cli/wireguardtunnel.go
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -52,6 +52,9 @@ func wireguardPortForward() *cobra.Command {
},
),
RunE: func(cmd *cobra.Command, args []string) error {
ctx, cancel := context.WithCancel(cmd.Context())
defer cancel()

specs, err := parsePortForwards(tcpForwards, nil, nil)
if err != nil {
return xerrors.Errorf("parse port-forward specs: %w", err)
Expand All @@ -69,21 +72,21 @@ func wireguardPortForward() *cobra.Command {
return err
}

workspace, workspaceAgent, err := getWorkspaceAndAgent(cmd, client, codersdk.Me, args[0], false)
workspace, workspaceAgent, err := getWorkspaceAndAgent(ctx, cmd, client, codersdk.Me, args[0], false)
if err != nil {
return err
}
if workspace.LatestBuild.Transition != codersdk.WorkspaceTransitionStart {
return xerrors.New("workspace must be in start transition to port-forward")
}
if workspace.LatestBuild.Job.CompletedAt == nil {
err = cliui.WorkspaceBuild(cmd.Context(), cmd.ErrOrStderr(), client, workspace.LatestBuild.ID, workspace.CreatedAt)
err = cliui.WorkspaceBuild(ctx, cmd.ErrOrStderr(), client, workspace.LatestBuild.ID, workspace.CreatedAt)
if err != nil {
return err
}
}

err = cliui.Agent(cmd.Context(), cmd.ErrOrStderr(), cliui.AgentOptions{
err = cliui.Agent(ctx, cmd.ErrOrStderr(), cliui.AgentOptions{
WorkspaceName: workspace.Name,
Fetch: func(ctx context.Context) (codersdk.WorkspaceAgent, error) {
return client.WorkspaceAgent(ctx, workspaceAgent.ID)
Expand All @@ -101,8 +104,9 @@ func wireguardPortForward() *cobra.Command {
if err != nil {
return xerrors.Errorf("create wireguard network: %w", err)
}
defer wgn.Close()

err = client.PostWireguardPeer(cmd.Context(), workspace.ID, peerwg.Handshake{
err = client.PostWireguardPeer(ctx, workspace.ID, peerwg.Handshake{
Recipient: workspaceAgent.ID,
NodePublicKey: wgn.NodePrivateKey.Public(),
DiscoPublicKey: wgn.DiscoPublicKey,
Expand All @@ -124,7 +128,6 @@ func wireguardPortForward() *cobra.Command {

// Start all listeners.
var (
ctx, cancel = context.WithCancel(cmd.Context())
wg = new(sync.WaitGroup)
listeners = make([]net.Listener, len(specs))
closeAllListeners = func() {
Expand All @@ -136,11 +139,11 @@ func wireguardPortForward() *cobra.Command {
}
}
)
defer cancel()
defer closeAllListeners()

for i, spec := range specs {
l, err := listenAndPortForwardWireguard(ctx, cmd, wgn, wg, spec, workspaceAgent.IPv6.IP())
if err != nil {
closeAllListeners()
return err
}
listeners[i] = l
Expand All @@ -149,7 +152,10 @@ func wireguardPortForward() *cobra.Command {
// Wait for the context to be canceled or for a signal and close
// all listeners.
var closeErr error
wg.Add(1)
go func() {
defer wg.Done()

sigs := make(chan os.Signal, 1)
signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)

Expand Down
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