From 3b9af437380850034e92d5936a49ac8bd68a9493 Mon Sep 17 00:00:00 2001
From: Julien Dessaux
Date: Tue, 5 Mar 2024 23:48:47 +0100
Subject: feat(stdlib): began adding systemd services support

---
 stdlib/os/systemd/systemd.go | 70 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 stdlib/os/systemd/systemd.go

diff --git a/stdlib/os/systemd/systemd.go b/stdlib/os/systemd/systemd.go
new file mode 100644
index 0000000..782548d
--- /dev/null
+++ b/stdlib/os/systemd/systemd.go
@@ -0,0 +1,70 @@
+package systemd
+
+import (
+	"errors"
+	"os/exec"
+
+	"git.adyxax.org/adyxax/gonf/v2/gonf"
+)
+
+func Promise() {
+	gonf.SetServiceFunction(systemd_service)
+}
+
+func isEnabled(name string) bool {
+	return systemctlShow(name, "UnitFileState") == "enabled"
+}
+
+func isRunning(name string) bool {
+	return systemctlShow(name, "SubState") == "running"
+}
+
+func systemctl(name, operation string) (gonf.Status, error) {
+	cmd := exec.Command("systemctl", operation, name)
+	if err := cmd.Run(); err != nil {
+		return gonf.BROKEN, err
+	}
+	return gonf.REPAIRED, nil
+}
+
+func systemctlShow(name, field string) string {
+	ecmd := exec.Command("systemctl", "show", name, "-p", field, "--value")
+	out, _ := ecmd.CombinedOutput()
+	return string(out[:len(out)-1]) // remove trailing '\n' and convert to string
+}
+
+func systemd_service(name, state string) (gonf.Status, error) {
+	switch state {
+	case "disabled":
+		if isEnabled(name) {
+			return systemctl(name, "disable")
+		} else {
+			return gonf.KEPT, nil
+		}
+	case "enabled":
+		if isEnabled(name) {
+			return gonf.KEPT, nil
+		} else {
+			return systemctl(name, "enable")
+		}
+	case "reloaded":
+		return systemctl(name, "reloaded")
+	case "restarted":
+		return systemctl(name, "restart")
+	case "started":
+		if isRunning(name) {
+			return gonf.KEPT, nil
+		} else {
+			return systemctl(name, "start")
+		}
+	case "stopped":
+		if isRunning(name) {
+			return systemctl(name, "stop")
+		} else {
+			return gonf.KEPT, nil
+		}
+	default:
+		return gonf.BROKEN, errors.New("unsupported systemctl operation " + state)
+	}
+	return gonf.KEPT, nil
+}
-- 
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