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// Copyright 2021 Northern.tech AS
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// +build windows
package util
import (
"context"
"os"
"os/signal"
"github.com/pkg/errors"
"golang.org/x/sys/windows"
)
// Disable TTY echo of stdin.
// Based on golang.org/x/crypto/ssh/terminal:util_windows.go
func DisableEcho(fd int) (uint32, error) {
var cmode uint32
err := windows.GetConsoleMode(windows.Handle(fd), &cmode)
if err != nil {
return 0, err
}
newCmode := cmode
newCmode &^= (windows.ENABLE_ECHO_INPUT)
newCmode |= (windows.ENABLE_LINE_INPUT |
windows.ENABLE_PROCESSED_INPUT |
windows.ENABLE_PROCESSED_OUTPUT)
if err := windows.SetConsoleMode(windows.Handle(int(os.Stdin.Fd())), cmode); err != nil {
return 0, err
}
return cmode, nil
}
// Signal handler to re-enable tty echo on interrupt. os/signal only
// handles ^C or ^BREAK events to the terminal, thus the signal won't be
// relayed to the OS handler for this case.
func EchoSigHandler(ctx context.Context, sigChan chan os.Signal, errChan chan error,
cmode uint32) {
for {
var (
sig os.Signal
sigRecved bool
)
select {
case <-ctx.Done():
errChan <- nil
return
case sig, sigRecved = <-sigChan:
}
// Enable console echo (restore cmode)
windows.SetConsoleMode(windows.Handle(int(os.Stdin.Fd())), cmode)
if sigRecved {
signal.Stop(sigChan)
errChan <- errors.Errorf("Received signal: %s",
sig.String())
} else {
errChan <- nil
return
}
}
}
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