Move SSH askpass implementation into kitten

tools/utils/atomic-write.go

@@ -20,6 +20,9 @@ func AtomicCreateSymlink(oldname, newname string) (err error) {
 	if !errors.Is(err, fs.ErrExist) {
 		return err
 	}
+	if et, err := os.Readlink(newname); err == nil && et == oldname {
+		return nil
+	}
 	for {
 		tempname := newname + RandomFilename()
 		err = os.Symlink(oldname, tempname)

tools/utils/shm/shm.go

@@ -52,6 +52,10 @@ type MMap interface {
 	IsFileSystemBacked() bool
 	FileSystemName() string
 	Stat() (fs.FileInfo, error)
+	Flush() error
+	Seek(offset int64, whence int) (int64, error)
+	Read(b []byte) (int, error)
+	ReadWithSize() ([]byte, error)
 }
 
 type AccessFlags int

tools/utils/shm/shm_fs.go

@@ -13,6 +13,8 @@ import (
 	"runtime"
 
 	"kitty/tools/utils"
+
+	"golang.org/x/sys/unix"
 )
 
 var _ = fmt.Print
@@ -51,6 +53,22 @@ func (self *file_based_mmap) Name() string {
 	return filepath.Base(self.f.Name())
 }
 
+func (self *file_based_mmap) Flush() error {
+	return unix.Msync(self.region, unix.MS_SYNC)
+}
+
+func (self *file_based_mmap) Seek(offset int64, whence int) (int64, error) {
+	return self.f.Seek(offset, whence)
+}
+
+func (self *file_based_mmap) Read(b []byte) (int, error) {
+	return self.f.Read(b)
+}
+
+func (self *file_based_mmap) ReadWithSize() ([]byte, error) {
+	return read_with_size(self.f)
+}
+
 func (self *file_based_mmap) FileSystemName() string {
 	return self.f.Name()
 }

tools/utils/shm/shm_syscall.go

@@ -92,10 +92,26 @@ func (self *syscall_based_mmap) Stat() (fs.FileInfo, error) {
 	return self.f.Stat()
 }
 
+func (self *syscall_based_mmap) Flush() error {
+	return unix.Msync(self.region, unix.MS_SYNC)
+}
+
 func (self *syscall_based_mmap) Slice() []byte {
 	return self.region
 }
 
+func (self *syscall_based_mmap) Seek(offset int64, whence int) (int64, error) {
+	return self.f.Seek(offset, whence)
+}
+
+func (self *syscall_based_mmap) Read(b []byte) (int, error) {
+	return self.f.Read(b)
+}
+
+func (self *syscall_based_mmap) ReadWithSize() ([]byte, error) {
+	return read_with_size(self.f)
+}
+
 func (self *syscall_based_mmap) Close() (err error) {
 	if self.region != nil {
 		self.f.Close()

tools/utils/shm/shm_test.go

@@ -23,6 +23,10 @@ func TestSHM(t *testing.T) {
 	}
 
 	copy(mm.Slice(), data)
+	err = mm.Flush()
+	if err != nil {
+		t.Fatalf("Failed to msync() with error: %v", err)
+	}
 	err = mm.Close()
 	if err != nil {
 		t.Fatalf("Failed to close with error: %v", err)