66 lines
1.7 KiB
Go
66 lines
1.7 KiB
Go
// Copyright 2017-2018 DigitalOcean.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//+build linux
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package smbios
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import (
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"io"
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"os"
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)
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const (
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// sysfs locations for SMBIOS information.
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sysfsDMI = "/sys/firmware/dmi/tables/DMI"
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sysfsEntryPoint = "/sys/firmware/dmi/tables/smbios_entry_point"
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)
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// stream opens the SMBIOS entry point and an SMBIOS structure stream.
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func stream() (io.ReadCloser, EntryPoint, error) {
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// First, check for the sysfs location present in modern kernels.
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_, err := os.Stat(sysfsEntryPoint)
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switch {
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case err == nil:
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return sysfsStream(sysfsEntryPoint, sysfsDMI)
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case os.IsNotExist(err):
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// Fall back to the standard UNIX-like system method.
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return devMemStream()
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default:
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return nil, nil, err
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}
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}
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// sysfsStream reads the SMBIOS entry point and structure stream from
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// two files; usually the modern sysfs locations.
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func sysfsStream(entryPoint, dmi string) (io.ReadCloser, EntryPoint, error) {
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epf, err := os.Open(entryPoint)
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if err != nil {
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return nil, nil, err
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}
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defer epf.Close()
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ep, err := ParseEntryPoint(epf)
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if err != nil {
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return nil, nil, err
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}
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sf, err := os.Open(dmi)
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if err != nil {
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return nil, nil, err
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}
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return sf, ep, nil
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}
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