From 24c5c05308abaffe59f84a403b0d7c27c772700b Mon Sep 17 00:00:00 2001
From: Omar Brikaa <brikaaomar@gmail.com>
Date: Fri, 4 Oct 2024 19:30:57 +0300
Subject: [PATCH] Give friendlier messages when cgroup v2 is not enabled

---
 api/src/docker-entrypoint.sh | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/api/src/docker-entrypoint.sh b/api/src/docker-entrypoint.sh
index 7cf37e3..2a4e49c 100755
--- a/api/src/docker-entrypoint.sh
+++ b/api/src/docker-entrypoint.sh
@@ -1,5 +1,21 @@
 #!/bin/bash
 
+CGROUP_FS="/sys/fs/cgroup"
+if [ ! -e "$CGROUP_FS" ]; then
+  echo "Cannot find $CGROUP_FS. Please make sure your system is using cgroup v2"
+  exit 1
+fi
+
+if [ -e "$CGROUP_FS/unified" ]; then
+  echo "Combined cgroup v1+v2 mode is not supported. Please make sure your system is using pure cgroup v2"
+  exit 1
+fi
+
+if [ ! -e "$CGROUP_FS/cgroup.subtree_control" ]; then
+  echo "Cgroup v2 not found. Please make sure cgroup v2 is enabled on your system"
+  exit 1
+fi
+
 cd /sys/fs/cgroup && \
 mkdir isolate/ && \
 echo 1 > isolate/cgroup.procs && \