512899d82d
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* Adds heuristic to detect an edge case on Linux where a system has configured logrotate as a separate service to rotate log files which would mangle our client log files. If we detect logrotate being configured for netbird, we disable our rotation. * Adds new env var to disable log rotation: NB_LOG_DISABLE_ROTATION * Adds compressed and plain logrotate files to debug bundle. * Replaces lumberjack with timberjack (maintained fork with bug fixes and extra features). * Clarifies which daemon version is running in the bundle stats. * Change logging for client service status to console
94 lines
2.1 KiB
Go
94 lines
2.1 KiB
Go
//go:build linux
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package util
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import (
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"bufio"
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"errors"
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"io/fs"
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"os"
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"path/filepath"
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"strings"
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log "github.com/sirupsen/logrus"
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)
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const (
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defaultLogrotateConfPath = "/etc/logrotate.conf"
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defaultLogrotateConfDir = "/etc/logrotate.d"
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netbirdString = "netbird"
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)
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// FindLogrotateConflicts scans the standard logrotate locations for
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// indications of conflict with netbird. It returns true and the config file
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// path if a conflict was found.
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func FindFirstLogrotateConflict() (bool, string) {
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return findFirstLogrotateConflictIn(defaultLogrotateConfPath, defaultLogrotateConfDir)
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}
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func findFirstLogrotateConflictIn(confPath, confDir string) (bool, string) {
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for _, f := range listLogrotateConfigs(confPath, confDir) {
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present, err := scanLogrotateFile(f, netbirdString)
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if err != nil {
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if !errors.Is(err, fs.ErrNotExist) {
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log.Debugf("scan %s: %v", f, err)
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}
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continue
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}
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if present {
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return present, f
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}
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}
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return false, ""
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}
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// listLogrotateConfigs returns all config files for logrotate.
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func listLogrotateConfigs(confPath, confDir string) []string {
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files := []string{confPath}
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entries, err := os.ReadDir(confDir)
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if err != nil {
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return files
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}
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for _, e := range entries {
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if e.IsDir() {
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continue
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}
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files = append(files, filepath.Join(confDir, e.Name()))
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}
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return files
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}
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// scanLogrotateFile reads a config and reports if a non-comment line
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// contains the given substring.
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func scanLogrotateFile(path string, substring string) (bool, error) {
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f, err := os.Open(path)
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if err != nil {
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return false, err
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}
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defer func() {
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if err := f.Close(); err != nil {
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log.Debugf("close %s: %v", path, err)
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}
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}()
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scanner := bufio.NewScanner(f)
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for scanner.Scan() {
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line := strings.TrimSpace(stripLogrotateComment(scanner.Text()))
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if line == "" {
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continue
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}
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if strings.Contains(line, substring) {
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return true, nil
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}
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}
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if err := scanner.Err(); err != nil {
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return false, err
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}
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return false, nil
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}
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func stripLogrotateComment(line string) string {
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before, _, _ := strings.Cut(line, "#")
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return before
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}
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