distros(void linux): initial packaging support

core/cmd/dms/init_service.go

@@ -0,0 +1,114 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"strings"
+
+	"github.com/AvengeMedia/DankMaterialShell/core/internal/privesc"
+)
+
+// runit (Void Linux) service helpers. Services live in /etc/sv and are "enabled"
+// by symlinking them into the /var/service supervision dir, so the greeter
+// commands branch on isRunit() instead of shelling systemctl.
+
+const (
+	runitSvDir      = "/etc/sv"
+	runitServiceDir = "/var/service"
+)
+
+// isRunit reports whether this system is supervised by runit (Void Linux).
+func isRunit() bool {
+	if fi, err := os.Stat("/run/runit"); err == nil && fi.IsDir() {
+		return true
+	}
+	if _, err := os.Stat("/run/systemd/system"); err == nil {
+		return false
+	}
+	if fi, err := os.Stat(runitServiceDir); err == nil && fi.IsDir() {
+		return true
+	}
+	return false
+}
+
+func runitServiceInstalled(name string) bool {
+	fi, err := os.Stat(runitSvDir + "/" + name)
+	return err == nil && fi.IsDir()
+}
+
+func runitServiceEnabled(name string) bool {
+	_, err := os.Lstat(runitServiceDir + "/" + name)
+	return err == nil
+}
+
+// enableRunitService links a service into /var/service (idempotent).
+func enableRunitService(name string) error {
+	if !runitServiceInstalled(name) {
+		return fmt.Errorf("runit service %q not found in %s", name, runitSvDir)
+	}
+	if runitServiceEnabled(name) {
+		return nil
+	}
+	return privesc.Run(context.Background(), "", "ln", "-sf",
+		runitSvDir+"/"+name, runitServiceDir+"/"+name)
+}
+
+// disableRunitService removes a service's supervision symlink.
+func disableRunitService(name string) error {
+	if !runitServiceEnabled(name) {
+		return nil
+	}
+	return privesc.Run(context.Background(), "", "rm", "-f",
+		runitServiceDir+"/"+name)
+}
+
+// ensureRunitSeat sets up the seat access a Wayland greeter needs on runit (the
+// equivalent of logind on systemd): enables seatd and adds the greeter user to
+// the seat/video/input groups. Failures are reported but non-fatal.
+func ensureRunitSeat(greeterUser string) {
+	if runitServiceInstalled("seatd") {
+		if err := enableRunitService("seatd"); err != nil {
+			fmt.Printf("  ⚠ could not enable seatd: %v\n", err)
+		} else {
+			fmt.Println("  ✓ seatd enabled")
+		}
+	} else {
+		fmt.Println("  ⚠ seatd not installed — the greeter compositor needs it for GPU/seat access")
+	}
+	if err := privesc.Run(context.Background(), "", "usermod", "-aG", "_seatd,video,input", greeterUser); err != nil {
+		fmt.Printf("  ⚠ could not add %s to seat groups: %v\n", greeterUser, err)
+	} else {
+		fmt.Printf("  ✓ %s added to seat groups (_seatd, video, input)\n", greeterUser)
+	}
+}
+
+// ensureGreetdPamRundir adds pam_rundir to the greetd PAM stack so the post-login
+// session gets an XDG_RUNTIME_DIR on systems without logind (Void with seatd).
+// Appended outside DMS's managed auth block so it survives `dms greeter sync`.
+func ensureGreetdPamRundir() {
+	const pamPath = "/etc/pam.d/greetd"
+	data, err := os.ReadFile(pamPath)
+	if err != nil {
+		fmt.Printf("  ⚠ could not read %s: %v\n", pamPath, err)
+		return
+	}
+	if strings.Contains(string(data), "pam_rundir") {
+		return
+	}
+	line := "session    optional    pam_rundir.so"
+	if err := privesc.Run(context.Background(), "", "sh", "-c",
+		fmt.Sprintf("printf '%%s\\n' %q >> %s", line, pamPath)); err != nil {
+		fmt.Printf("  ⚠ could not add pam_rundir to %s: %v\n", pamPath, err)
+		return
+	}
+	fmt.Println("  ✓ pam_rundir added to greetd PAM (provides XDG_RUNTIME_DIR for the session)")
+}
+
+// startGreeterHint returns the init-appropriate "start greetd now" command.
+func startGreeterHint() string {
+	if isRunit() {
+		return "  sudo sv up greetd"
+	}
+	return "  sudo systemctl start greetd"
+}