Privatae
78 lines
2.0 KiB
Go
78 lines
2.0 KiB
Go
//go:build linux
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package main
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import (
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"os"
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"path/filepath"
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"strings"
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)
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// Linux scheduler inventory: the system crontab and cron.d (five fields, a
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// user, a command), every user's crontab under the spool (Debian and RHEL
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// layouts), and systemd timers with the ExecStart of the unit they activate.
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// User-level systemd timers (`systemctl --user`) are per login session and
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// are not read from a root service; that gap is stated, not papered over.
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const maxCronFiles = 500
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func platformSchedulers() ([]schedEntry, []string, bool) {
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all := []schedEntry{}
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kinds := []string{}
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cronRead := false
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readSystem := func(path string) {
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data, err := os.ReadFile(path)
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if err != nil {
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return
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}
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cronRead = true
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all = append(all, parseCrontab(string(data), path, "", true)...)
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}
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readSystem("/etc/crontab")
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if ents, err := os.ReadDir("/etc/cron.d"); err == nil {
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for i, e := range ents {
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if i >= maxCronFiles || e.IsDir() || strings.HasPrefix(e.Name(), ".") {
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continue
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}
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readSystem(filepath.Join("/etc/cron.d", e.Name()))
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}
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}
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for _, spool := range []string{"/var/spool/cron/crontabs", "/var/spool/cron"} {
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ents, err := os.ReadDir(spool)
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if err != nil {
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continue
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}
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for i, e := range ents {
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if i >= maxCronFiles || e.IsDir() {
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continue
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}
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p := filepath.Join(spool, e.Name())
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data, err := os.ReadFile(p)
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if err != nil {
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continue
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}
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cronRead = true
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all = append(all, parseCrontab(string(data), p, e.Name(), false)...)
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}
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}
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if cronRead {
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kinds = append(kinds, "cron")
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}
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timers := systemdTimerUnits()
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if len(timers) > 0 {
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kinds = append(kinds, "systemd-timer")
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}
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for unit, timer := range timers {
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out, err := runTimed("systemctl", "show", unit, "-p", "ExecStart", "--value")
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if err != nil {
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continue
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}
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cmd := parseExecStart(string(out))
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if cmd == "" {
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continue
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}
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all = append(all, schedEntry{Kind: "systemd-timer", Name: timer, Command: truncate(cmd, 200), Schedule: unit})
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}
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return all, kinds, true
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}
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