bastion 0.53.2

client-go/schedulers_linux.go

@@ -0,0 +1,77 @@
+//go:build linux
+
+package main
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+// Linux scheduler inventory: the system crontab and cron.d (five fields, a
+// user, a command), every user's crontab under the spool (Debian and RHEL
+// layouts), and systemd timers with the ExecStart of the unit they activate.
+// User-level systemd timers (`systemctl --user`) are per login session and
+// are not read from a root service; that gap is stated, not papered over.
+
+const maxCronFiles = 500
+
+func platformSchedulers() ([]schedEntry, []string, bool) {
+	all := []schedEntry{}
+	kinds := []string{}
+	cronRead := false
+	readSystem := func(path string) {
+		data, err := os.ReadFile(path)
+		if err != nil {
+			return
+		}
+		cronRead = true
+		all = append(all, parseCrontab(string(data), path, "", true)...)
+	}
+	readSystem("/etc/crontab")
+	if ents, err := os.ReadDir("/etc/cron.d"); err == nil {
+		for i, e := range ents {
+			if i >= maxCronFiles || e.IsDir() || strings.HasPrefix(e.Name(), ".") {
+				continue
+			}
+			readSystem(filepath.Join("/etc/cron.d", e.Name()))
+		}
+	}
+	for _, spool := range []string{"/var/spool/cron/crontabs", "/var/spool/cron"} {
+		ents, err := os.ReadDir(spool)
+		if err != nil {
+			continue
+		}
+		for i, e := range ents {
+			if i >= maxCronFiles || e.IsDir() {
+				continue
+			}
+			p := filepath.Join(spool, e.Name())
+			data, err := os.ReadFile(p)
+			if err != nil {
+				continue
+			}
+			cronRead = true
+			all = append(all, parseCrontab(string(data), p, e.Name(), false)...)
+		}
+	}
+	if cronRead {
+		kinds = append(kinds, "cron")
+	}
+	timers := systemdTimerUnits()
+	if len(timers) > 0 {
+		kinds = append(kinds, "systemd-timer")
+	}
+	for unit, timer := range timers {
+		out, err := runTimed("systemctl", "show", unit, "-p", "ExecStart", "--value")
+		if err != nil {
+			continue
+		}
+		cmd := parseExecStart(string(out))
+		if cmd == "" {
+			continue
+		}
+		all = append(all, schedEntry{Kind: "systemd-timer", Name: timer, Command: truncate(cmd, 200), Schedule: unit})
+	}
+	return all, kinds, true
+}