mirror of
https://github.com/gravitational/teleport
synced 2024-10-22 02:03:24 +00:00
97 lines
2.5 KiB
Go
97 lines
2.5 KiB
Go
/*
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Copyright 2019 Gravitational, Inc.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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 utils
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import (
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"bytes"
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"fmt"
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"io"
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"io/ioutil"
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"os"
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"runtime"
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"strings"
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"github.com/gravitational/teleport/api/constants"
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"github.com/gravitational/trace"
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"github.com/coreos/go-semver/semver"
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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 := os.Open("/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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// 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 := ioutil.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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// Only keep the major, minor, and patch, throw away everything after "-".
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parts := bytes.Split(buf, []byte("-"))
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s := strings.TrimSpace(string(parts[0]))
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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 := os.Open(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: %v", btfFile, err)
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}
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