mirror of
https://github.com/gravitational/teleport.git
synced 2026-09-21 14:35:22 +08:00
rosstimothy
b7318b5c7e
Adds the new linter and configures it to prevent direct error comparisions and type assertions in favor of errors.Is and errors.As. All current violations caught by the linter have been updated accordingly.
106 lines
2.9 KiB
Go
106 lines
2.9 KiB
Go
/*
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* Teleport
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* Copyright (C) 2023 Gravitational, Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package utils
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import (
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"fmt"
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"io"
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"os"
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"regexp"
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"runtime"
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"github.com/coreos/go-semver/semver"
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"github.com/gravitational/trace"
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"github.com/gravitational/teleport/api/constants"
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)
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// KernelVersion parses /proc/sys/kernel/osrelease and returns the kernel
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// version of the host. This only returns something meaningful on Linux.
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func KernelVersion() (*semver.Version, error) {
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if runtime.GOOS != constants.LinuxOS {
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return nil, trace.BadParameter("requested kernel version on non-Linux host")
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}
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file, err := OpenFileNoUnsafeLinks("/proc/sys/kernel/osrelease")
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if err != nil {
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return nil, trace.Wrap(err)
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}
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defer file.Close()
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ver, err := kernelVersion(file)
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if err != nil {
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return nil, trace.Wrap(err)
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}
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return ver, nil
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}
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// kernelVersionRegex extracts the first three digits of a version from
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// a kernel version - this strips off any additional digits or additional
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// information appended to the kernel version e.g:
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// 5.15.68.1-microsoft-standard-WSL2 => 5.15.68
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var kernelVersionRegex = regexp.MustCompile(`^\d+\.\d+\.\d+`)
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// kernelVersion reads in the kernel version from the reader and returns
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// a *semver.Version.
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func kernelVersion(reader io.Reader) (*semver.Version, error) {
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buf, err := io.ReadAll(reader)
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if err != nil {
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return nil, trace.Wrap(err)
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}
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s := kernelVersionRegex.FindString(string(buf))
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if s == "" {
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return nil, trace.BadParameter(
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"unable to extract kernel semver from string %q",
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string(buf),
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)
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}
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ver, err := semver.NewVersion(s)
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if err != nil {
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return nil, trace.Wrap(err)
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}
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return ver, nil
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}
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const btfFile = "/sys/kernel/btf/vmlinux"
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// HasBTF checks that the kernel has been compiled with BTF support and
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// that the type information can be opened. Returns nil if BTF is there
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// and accessible, otherwise an error describing the problem.
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func HasBTF() error {
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if runtime.GOOS != constants.LinuxOS {
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return trace.BadParameter("requested kernel version on non-Linux host")
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}
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file, err := OpenFileNoUnsafeLinks(btfFile)
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if err == nil {
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file.Close()
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return nil
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}
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if os.IsNotExist(err) {
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return fmt.Errorf("%v was not found. Make sure the kernel was compiled with BTF support (CONFIG_DEBUG_INFO_BTF)", btfFile)
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}
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return fmt.Errorf("failed to open %v: %w", btfFile, err)
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}
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