From 2a8ba70e235e5807cb27e734ce8faec1b1ec21de Mon Sep 17 00:00:00 2001
From: Dominic <git@msrd0.de>
Date: Thu, 2 Nov 2023 10:23:31 +0100
Subject: [PATCH] limit the ram usage of ffmpeg

---
 src/render/mod.rs | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/src/render/mod.rs b/src/render/mod.rs
index 1c963e0..b5ea7e4 100644
--- a/src/render/mod.rs
+++ b/src/render/mod.rs
@@ -21,6 +21,8 @@ use std::{
 	process::{Command, Stdio}
 };
 
+const MEMORY_LIMIT: &str = "2G";
+
 const INTRO_LEN: Time = Time {
 	seconds: 3,
 	micros: 0
@@ -39,8 +41,18 @@ const FF_LOGO_SIZE: usize = 128;
 const LOGO_SIZE: usize = 96;
 
 fn cmd() -> Command {
-	let mut cmd = Command::new("busybox");
-	cmd.arg("ash")
+	// we use systemd-run to limit the process memory
+	// I tried others like ulimit, chpst or isolate, but none worked
+	let mut cmd = Command::new("systemd-run");
+	cmd.arg("--scope")
+		.arg("-q")
+		.arg("--expand-environment=no")
+		.arg("-p")
+		.arg(format!("MemoryMax={MEMORY_LIMIT}"))
+		.arg("--user");
+	// we use busybox ash for having a shell that outputs commands with -x
+	cmd.arg("busybox")
+		.arg("ash")
 		.arg("-exuo")
 		.arg("pipefail")
 		.arg("-c")