remove remount: was killing 9pfuse on exit

The retry-with-remount pattern called ollie-remount (which does
sudo umount -f) from goroutines that raced with os.Exit, nuking
the shared FUSE mount. The watchdog handles recovery now.

main.go

@@ -4,19 +4,16 @@ package main
 import (
 	"log"
 	"os"
-	"os/exec"
 	"path/filepath"
 	"sort"
 	"strings"
 	"sync"
-	"sync/atomic"
 	"time"
 
 	"9fans.net/go/acme"
 )
 
 var ollie string
-var exiting atomic.Bool
 
 func init() {
 	ollie = os.Getenv("OLLIE")
@@ -25,40 +22,6 @@ func init() {
 	}
 }
 
-func remount() {
-	if exiting.Load() {
-		return
-	}
-	exec.Command("ollie-remount").Run() //nolint:errcheck
-}
-
-func readFileRetry(path string) ([]byte, error) {
-	data, err := os.ReadFile(path)
-	if err != nil {
-		remount()
-		data, err = os.ReadFile(path)
-	}
-	return data, err
-}
-
-func writeFileRetry(path string, data []byte) error {
-	err := os.WriteFile(path, data, 0644)
-	if err != nil {
-		remount()
-		err = os.WriteFile(path, data, 0644)
-	}
-	return err
-}
-
-func statRetry(path string) (os.FileInfo, error) {
-	fi, err := os.Stat(path)
-	if err != nil {
-		remount()
-		fi, err = os.Stat(path)
-	}
-	return fi, err
-}
-
 func main() {
 	acme.AutoExit(true)
 	if err := newSessionList(); err != nil {
@@ -90,7 +53,7 @@ func newSessionList() error {
 }
 
 func (sl *sessionList) refresh() {
-	data, err := readFileRetry(filepath.Join(ollie, "s", "idx"))
+	data, err := os.ReadFile(filepath.Join(ollie, "s", "idx"))
 	if err != nil {
 		sl.win.Errf("read idx: %v", err)
 		return
@@ -150,7 +113,7 @@ func (sl *sessionList) eventLoop() {
 				arg := strings.TrimSpace(string(e.Arg))
 				sid := sl.resolveFullSID(arg)
 				if sid != "" {
-					writeFileRetry(filepath.Join(ollie, "s", sid, "ctl"), []byte("kill"))
+					os.WriteFile(filepath.Join(ollie, "s", sid, "ctl"), []byte("kill"), 0644) //nolint:errcheck
 					sl.refresh()
 				}
 				continue
@@ -169,12 +132,11 @@ func (sl *sessionList) eventLoop() {
 			sl.win.WriteEvent(e)
 		}
 	}
-	exiting.Store(true)
 	os.Exit(0)
 }
 
 func sessionExists(sid string) bool {
-	_, err := statRetry(filepath.Join(ollie, "s", sid))
+	_, err := os.Stat(filepath.Join(ollie, "s", sid))
 	return err == nil
 }
 
@@ -201,7 +163,7 @@ func openChat(sid string) {
 		return
 	}
 	winName := "ollie/sessions/" + sid
-	if data, err := readFileRetry(filepath.Join(ollie, "s", "idx")); err == nil {
+	if data, err := os.ReadFile(filepath.Join(ollie, "s", "idx")); err == nil {
 		for _, line := range strings.Split(string(data), "\n") {
 			fields := strings.Split(line, "\t")
 			if len(fields) >= 3 && fields[0] == sid {
@@ -219,7 +181,7 @@ func openChat(sid string) {
 
 	// Load existing chat.
 	chatPath := filepath.Join(ollie, "s", sid, "chat")
-	if data, err := readFileRetry(chatPath); err == nil && len(data) > 0 {
+	if data, err := os.ReadFile(chatPath); err == nil && len(data) > 0 {
 		w.Write("body", data)
 		cw.offset = len(data)
 	}
@@ -239,7 +201,7 @@ func (cw *chatWin) eventLoop() {
 			case "Prompt":
 				openFile(filepath.Join(ollie, "s", cw.sid, "prompt"))
 			case "Stop":
-				writeFileRetry(filepath.Join(ollie, "s", cw.sid, "ctl"), []byte("stop"))
+				os.WriteFile(filepath.Join(ollie, "s", cw.sid, "ctl"), []byte("stop"), 0644) //nolint:errcheck
 			case "Ctl":
 				openFile(filepath.Join(ollie, "s", cw.sid, "ctl"))
 			default:
@@ -256,7 +218,7 @@ func (cw *chatWin) tail() {
 	chatPath := filepath.Join(ollie, "s", cw.sid, "chat")
 
 	for {
-		fi, err := statRetry(chatPath)
+		fi, err := os.Stat(chatPath)
 		if err != nil {
 			if os.IsNotExist(err) {
 				return