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e81b3d11a8
Since dmesg is not streamed, it becomes difficult to debug issues with machined. This fixes that by setting up the logging of machine to go to /dev/kmsg and to a log file. Signed-off-by: Andrew Rynhard <andrew@andrewrynhard.com>
50 lines
1.1 KiB
Go
50 lines
1.1 KiB
Go
// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this
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// file, You can obtain one at http://mozilla.org/MPL/2.0/.
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package kmsg
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import (
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"fmt"
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"io"
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"log"
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"os"
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"path/filepath"
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"golang.org/x/sys/unix"
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"github.com/talos-systems/talos/pkg/constants"
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)
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// Setup configures the log package to write to the kernel ring buffer via
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// /dev/kmsg.
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func Setup(prefix string, withLogFile bool) error {
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kmsg, err := os.OpenFile("/dev/kmsg", os.O_RDWR|unix.O_CLOEXEC|unix.O_NONBLOCK|unix.O_NOCTTY, 0666)
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if err != nil {
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return fmt.Errorf("failed to open /dev/kmsg: %w", err)
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}
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var writer io.Writer = kmsg
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if withLogFile {
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if err := os.MkdirAll(constants.DefaultLogPath, 0700); err != nil {
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return err
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}
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logPath := filepath.Join(constants.DefaultLogPath, "machined.log")
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f, err := os.OpenFile(logPath, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
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if err != nil {
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return fmt.Errorf("failed to open %s: %w", logPath, err)
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}
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writer = io.MultiWriter(kmsg, f)
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}
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log.SetOutput(writer)
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log.SetPrefix(prefix + " ")
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log.SetFlags(0)
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return nil
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}
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