github.com/u-root/u-root@v7.0.1-0.20200915234505-ad7babab0a8e+incompatible/cmds/exp/dmidecode/data_linux.go (about)

     1  // Copyright 2016-2019 the u-root Authors. All rights reserved
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package main
     6  
     7  import (
     8  	"errors"
     9  	"fmt"
    10  	"io"
    11  	"io/ioutil"
    12  	"path/filepath"
    13  )
    14  
    15  // getData returns SMBIOS entry point and DMI table data.
    16  // If dumpFile is non-empty, it is read from that file, otherwise it is read
    17  // from sysfsPath (smbios_entry_point and DMI files respectively).
    18  func getData(textOut io.Writer, dumpFile, sysfsPath string) ([]byte, []byte, error) {
    19  	var err error
    20  	var entry, data []byte
    21  	if dumpFile != "" {
    22  		fmt.Fprintf(textOut, "Reading SMBIOS/DMI data from file %s.\n", dumpFile)
    23  		data, err = ioutil.ReadFile(dumpFile)
    24  		if err != nil {
    25  			return nil, nil, fmt.Errorf("error reading dump: %v", err)
    26  		}
    27  		if len(data) < 36 {
    28  			return nil, nil, errors.New("dump is too short")
    29  		}
    30  		entry = data[:32]
    31  		data = data[32:]
    32  	} else {
    33  		fmt.Fprintf(textOut, "Reading SMBIOS/DMI data from sysfs.\n")
    34  		entry, err = ioutil.ReadFile(filepath.Join(sysfsPath, "smbios_entry_point"))
    35  		if err != nil {
    36  			return nil, nil, fmt.Errorf("error reading DMI data: %v", err)
    37  		}
    38  		data, err = ioutil.ReadFile(filepath.Join(sysfsPath, "DMI"))
    39  		if err != nil {
    40  			return nil, nil, fmt.Errorf("error reading DMI data: %v", err)
    41  		}
    42  	}
    43  	return entry, data, nil
    44  }