From 412994775bd37542d135a972968439e48ee4b44f Mon Sep 17 00:00:00 2001
From: AnErrupTion <anerruption@disroot.org>
Date: Fri, 17 Oct 2025 23:10:52 +0200
Subject: [PATCH] Add SysVinit service (closes #224)

Signed-off-by: AnErrupTion <anerruption@disroot.org>
---
 build.zig       | 11 +++++++++
 readme.md       | 10 ++++++++
 res/ly-sysvinit | 65 +++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 86 insertions(+)
 create mode 100755 res/ly-sysvinit

diff --git a/build.zig b/build.zig
index b2864d5..1373f00 100644
--- a/build.zig
+++ b/build.zig
@@ -8,6 +8,7 @@ const InitSystem = enum {
     runit,
     s6,
     dinit,
+    sysvinit,
 };
 
 const min_zig_string = "0.15.0";
@@ -308,6 +309,15 @@ fn install_service(allocator: std.mem.Allocator, patch_map: PatchMap) !void {
             const patched_service = try patchFile(allocator, "res/ly-dinit", patch_map);
             try installText(patched_service, service_dir, service_path, "ly", .{});
         },
+        .sysvinit => {
+            const service_path = try std.fs.path.join(allocator, &[_][]const u8{ dest_directory, config_directory, "/init.d" });
+            std.fs.cwd().makePath(service_path) catch {};
+            var service_dir = std.fs.cwd().openDir(service_path, .{}) catch unreachable;
+            defer service_dir.close();
+
+            const patched_service = try patchFile(allocator, "res/ly-sysvinit", patch_map);
+            try installText(patched_service, service_dir, service_path, "ly", .{});
+        },
     }
 }
 
@@ -339,6 +349,7 @@ pub fn Uninstaller(uninstall_config: bool) type {
                     try deleteFile(allocator, config_directory, "/s6/adminsv/default/contents.d/ly-srv", "s6 admin service not found");
                 },
                 .dinit => try deleteFile(allocator, config_directory, "/dinit.d/ly", "dinit service not found"),
+                .sysvinit => try deleteFile(allocator, config_directory, "/init.d/ly", "sysvinit service not found"),
             }
         }
     };
diff --git a/readme.md b/readme.md
index 4690b02..1919f91 100644
--- a/readme.md
+++ b/readme.md
@@ -159,6 +159,16 @@ To disable TTY 2, edit `/etc/s6/config/tty2.conf` and set `SPAWN="no"`.
 To disable TTY 2, go to `/etc/dinit.d/config/console.conf` and modify
 `ACTIVE_CONSOLES`.
 
+### sysvinit
+
+```
+# zig build installexe -Dinit_system=sysvinit
+# update-rc.d lightdm disable
+# update-rc.d ly defaults
+```
+
+To disable TTY 2, go to `/etc/inittab` and comment out the line containing `tty2`.
+
 ### Updating
 
 You can also install Ly without overrding the current configuration file. This
diff --git a/res/ly-sysvinit b/res/ly-sysvinit
new file mode 100755
index 0000000..f24dfd4
--- /dev/null
+++ b/res/ly-sysvinit
@@ -0,0 +1,65 @@
+#!/bin/sh
+### BEGIN INIT INFO
+# Provides:          ly
+# Required-Start:    $remote_fs $syslog
+# Required-Stop:     $remote_fs $syslog
+# Default-Start:     2 3 4 5
+# Default-Stop:      0 1 6
+# Short-Description: Ly display manager
+# Description:       Starts and stops the Ly display manager
+### END INIT INFO
+#
+# Author:       AnErrupTion <anerruption@disroot.org>
+#
+
+PATH=/sbin:/usr/sbin:/bin:/usr/bin
+DAEMON=/usr/bin/ly
+TTY=/dev/tty$DEFAULT_TTY
+PIDFILE=/var/run/ly.pid
+NAME=ly
+DESC="Ly display manager"
+
+. /lib/lsb/init-functions
+
+case "$1" in
+  start)
+    log_daemon_msg "Starting $DESC on $TTY..."
+    if [ -f "$PIDFILE" ]; then
+        log_progress_msg "$DESC is already running"
+        log_end_msg 0
+        return 0
+    fi
+
+    # Ensure TTY exists
+    [ -c "$TTY" ] || {
+        log_failure_msg "$TTY does not exist"
+        return 1
+    }
+
+    start-stop-daemon --start --background --make-pidfile --pidfile $PIDFILE \
+      --chdir / --exec /bin/sh -- -c "exec setsid sh -c 'exec <$TTY >$TTY 2>&1 $DAEMON'"
+    log_end_msg $?
+    ;;
+  stop)
+    log_daemon_msg "Stopping $DESC..."
+    start-stop-daemon --stop --pidfile $PIDFILE --retry 5
+    RETVAL=$?
+    [ $RETVAL -eq 0 ] && rm -f "$PIDFILE"
+    log_end_msg $RETVAL
+    ;;
+  restart)
+    echo "Restarting $DESC..."
+    $0 stop
+    sleep 1
+    $0 start
+    ;;
+  status)
+    status_of_proc -p $PIDFILE $DAEMON $NAME && exit 0 || exit $?
+    ;;
+  *)
+    echo "Usage: /etc/init.d/$NAME {start|stop|restart|status}"
+    exit 1
+    ;;
+esac
+
+exit 0