gitee.com/mysnapcore/mysnapd@v0.1.0/secboot/luks2/fifo.go (about)

     1  // -*- Mode: Go; indent-tabs-mode: t -*-
     2  
     3  /*
     4   * Copyright (C) 2022 Canonical Ltd
     5   *
     6   * This program is free software: you can redistribute it and/or modify
     7   * it under the terms of the GNU General Public License version 3 as
     8   * published by the Free Software Foundation.
     9   *
    10   * This program is distributed in the hope that it will be useful,
    11   * but WITHOUT ANY WARRANTY; without even the implied warranty of
    12   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    13   * GNU General Public License for more details.
    14   *
    15   * You should have received a copy of the GNU General Public License
    16   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
    17   *
    18   */
    19  
    20  package luks2
    21  
    22  import (
    23  	"fmt"
    24  	"io/ioutil"
    25  	"os"
    26  	"path/filepath"
    27  
    28  	"golang.org/x/sys/unix"
    29  	"golang.org/x/xerrors"
    30  
    31  	"gitee.com/mysnapcore/mysnapd/dirs"
    32  )
    33  
    34  func mkFifo() (string, func(), error) {
    35  	// /run is not world writable but we create a unique directory here because this
    36  	// code can be invoked by a public API and we shouldn't fail if more than one
    37  	// process reaches here at the same time.
    38  	dir, err := ioutil.TempDir(dirs.RunDir, filepath.Base(os.Args[0])+".")
    39  	if err != nil {
    40  		return "", nil, xerrors.Errorf("cannot create temporary directory: %w", err)
    41  	}
    42  
    43  	cleanup := func() {
    44  		if err := os.RemoveAll(dir); err != nil {
    45  			fmt.Fprintf(stderr, "luks2.mkFifo: cannot remove fifo: %v\n", err)
    46  		}
    47  	}
    48  
    49  	succeeded := false
    50  	defer func() {
    51  		if succeeded {
    52  			return
    53  		}
    54  		cleanup()
    55  	}()
    56  
    57  	fifo := filepath.Join(dir, "fifo")
    58  	if err := unix.Mkfifo(fifo, 0600); err != nil {
    59  		return "", nil, xerrors.Errorf("cannot create FIFO: %w", err)
    60  	}
    61  
    62  	succeeded = true
    63  	return fifo, cleanup, nil
    64  }