fix: handle SIGHUP from OpenSSH (#10638)

Fixes an issue where remote forwards are not correctly torn down when using OpenSSH with `coder ssh --stdio`.  OpenSSH sends a disconnect signal, but then also sends SIGHUP to `coder`.  Previously, we just exited when we got SIGHUP, and this raced against properly disconnecting.

Fixes https://github.com/coder/customers/issues/327

enterprise/cli/provisionerdaemons.go

@@ -6,7 +6,6 @@ import (
 	"context"
 	"fmt"
 	"os"
-	"os/signal"
 	"time"
 
 	"github.com/google/uuid"
@@ -61,7 +60,7 @@ func (r *RootCmd) provisionerDaemonStart() *clibase.Cmd {
 			ctx, cancel := context.WithCancel(inv.Context())
 			defer cancel()
 
-			notifyCtx, notifyStop := signal.NotifyContext(ctx, agpl.InterruptSignals...)
+			notifyCtx, notifyStop := inv.SignalNotifyContext(ctx, agpl.InterruptSignals...)
 			defer notifyStop()
 
 			tags, err := agpl.ParseProvisionerTags(rawTags)

enterprise/cli/proxyserver.go

@@ -10,7 +10,6 @@ import (
 	"net"
 	"net/http"
 	"net/http/pprof"
-	"os/signal"
 	"regexp"
 	rpprof "runtime/pprof"
 	"time"
@@ -142,7 +141,7 @@ func (*RootCmd) proxyServer() *clibase.Cmd {
 			//
 			// To get out of a graceful shutdown, the user can send
 			// SIGQUIT with ctrl+\ or SIGKILL with `kill -9`.
-			notifyCtx, notifyStop := signal.NotifyContext(ctx, cli.InterruptSignals...)
+			notifyCtx, notifyStop := inv.SignalNotifyContext(ctx, cli.InterruptSignals...)
 			defer notifyStop()
 
 			// Clean up idle connections at the end, e.g.