mirror of
https://github.com/NVIDIA/nvidia-container-toolkit
synced 2024-11-24 13:05:17 +00:00
117 lines
2.8 KiB
Go
117 lines
2.8 KiB
Go
/*
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# Copyright (c) 2021, NVIDIA CORPORATION. All rights reserved.
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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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*/
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package proc
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import (
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"bufio"
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"fmt"
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"io"
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"log"
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"os"
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"strings"
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)
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const (
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procDevicesPath = "/proc/devices"
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nvidiaDevicePrefix = "nvidia"
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)
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// Device represents a device as specified under /proc/devices
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type Device struct {
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Name string
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Major int
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}
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// NvidiaDevices represents the set of nvidia owned devices under /proc/devices
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type NvidiaDevices interface {
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Exists(name string) bool
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Get(name string) (Device, bool)
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}
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type nvidiaDevices map[string]Device
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var _ NvidiaDevices = nvidiaDevices(nil)
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// Exists checks if a Device with a given name exists or not
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func (d nvidiaDevices) Exists(name string) bool {
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_, exists := d[name]
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return exists
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}
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// Get a Device from NvidiaDevices
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func (d nvidiaDevices) Get(name string) (Device, bool) {
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device, exists := d[name]
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return device, exists
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}
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func (d nvidiaDevices) add(devices ...Device) {
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for _, device := range devices {
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d[device.Name] = device
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}
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}
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// NewMockNvidiaDevices returns NvidiaDevices populated from the devices passed in
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func NewMockNvidiaDevices(devices ...Device) NvidiaDevices {
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nvds := make(nvidiaDevices)
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nvds.add(devices...)
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return nvds
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}
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// GetNvidiaDevices returns the set of NvidiaDevices on the machine
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func GetNvidiaDevices() (NvidiaDevices, error) {
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devicesFile, err := os.Open(procDevicesPath)
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if os.IsNotExist(err) {
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return nil, nil
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}
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if err != nil {
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return nil, fmt.Errorf("error opening devices file: %v", err)
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}
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defer devicesFile.Close()
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return processDeviceFile(devicesFile), nil
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}
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func processDeviceFile(devicesFile io.Reader) NvidiaDevices {
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nvidiaDevices := make(nvidiaDevices)
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scanner := bufio.NewScanner(devicesFile)
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for scanner.Scan() {
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device, major, err := processProcDeviceLine(scanner.Text())
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if err != nil {
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log.Printf("Skipping line in devices file: %v", err)
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continue
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}
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if strings.HasPrefix(device, nvidiaDevicePrefix) {
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nvidiaDevices.add(Device{device, major})
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}
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}
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return nvidiaDevices
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}
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func processProcDeviceLine(line string) (string, int, error) {
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trimmed := strings.TrimSpace(line)
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var name string
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var major int
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n, _ := fmt.Sscanf(trimmed, "%d %s", &major, &name)
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if n == 2 {
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return name, major, nil
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}
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return "", 0, fmt.Errorf("unparsable line: %v", line)
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}
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